Causes of Leakage of Mechanical Seal of Boiler Pump and Its Treatment

Boiler pump mechanical seal is an indispensable part of power machinery and fluid machinery, which is of great significance to the safety of machinery. Boiler pump mechanical seal leakage for a variety of reasons, such as the problem of sealing flushing water, the device itself flaws, filling the media on the device corrosion, sealing performance, etc., for these problems must start from the root, in turn solve the process, equipment , Maintenance, operation on the issue, only to do all-round troubleshooting can completely solve the mechanical seal problem, to ensure the good operation of the boiler pump machinery.
In actual production, different operating conditions and production conditions will have an important impact on the mechanical seal of the boiler pump, and may even lead to the loss of the basic performance of the boiler pump machinery. Therefore, the analysis of the cause of the leakage of the mechanical seal of the boiler pump has important practical significance and safety Meaning, a comprehensive analysis of the reasons can improve the safety, mechanical Jia moving rate. Mechanical life, etc., so the choice of mechanical seal for the maintenance of many enterprises has always been a top priority.
 Reasons for Failure of Mechanical Seal of Boiler Pump
        1, corrosion caused by mechanical seal failure
        Boiler pump mechanical seal corrosion, including metal ring corrosion, non-metallic ring corrosion and auxiliary seals and contact parts of the corrosion.
        1) metal ring corrosion
        Metal ring itself does not have anti-corrosion ability, direct contact with corrosive media surface will be corrosion, the initial stage will be strange sound, leakage, wear and so on. Corrosion will spread to the inside at a certain speed. Under the action of external force, the metal ring will be stress-deformed, and the exposed part is the hardest hit area, and gradually affect the other areas through the weak link, and then produce mechanical seal leakage.
        2) non-metallic ring corrosion
        Graphite ring is also a mechanical seal is one of the important reasons, the cross-section temperature is too high, improper choice of impregnated resin, impregnated resin depth is not enough and so are the cause of graphite ring corrosion. When the graphite ring in the oxidizing medium, the overall cooling or poor friction, the environment produced three or four hundred degrees will lead to graphite and oxidative media oxidation reaction, so that the end becomes loses performance.
        3) corrosion of auxiliary seals and contact parts
        Different materials have different corrosion resistance, auxiliary sealing material is generally selected with elastic rubber, and rubber corrosion will make the surface becomes unusually rough, loss of the original elasticity. And rubber high temperature performance is relatively poor, generally not more than two hundred degrees.
        And the auxiliary seal in contact with the site in a relatively static state, between the gap and friction between the two will be the cause of corrosion, and the corrosion surface is generally wide and deeper.
      Failure Performance of Boiler Pump Mechanical Seal
        During the production process, the reason for the leakage of the mechanical seal of the boiler pump has its own reasons and external causes, the choice of materials and the way of installation and use will cause the mechanical seal failure, failure of the failure performance is also different, learn through different failures Performance and make correct and timely judgments can provide a strong support for the actual production.
        1, static pressure test leaked
        Mechanical seal device in the installation because the staff is not careful, often make the seal face was bumped so that deformation and damage, cleaning is not thorough enough, making the mechanical seal folder with granular impurities, or because the positioning screw loose, gland no pressure Tight and the accuracy of the machine equipment is not high enough to make the sealing surface is not fully fit between, will cause mechanical seal failure, media leakage. If there is a leak in the sleeve, the reason may be that the compression of the sleeve seal is not enough or not compressed, it is possible that the device has been damaged.
        2, periodic leaks
        Mechanical seal components in the periodic rotation of the rotor components and axial movement is too large will be in the mechanical seal of the leakage, the sealing surface of the mechanical seal to be a certain stress to play a good role in sealing. To do the above requirements, the mechanical seal of the spring device must have a certain amount of compression to the end of a certain role in the stress, so that the mechanical seal to achieve the desired sealing effect. At the same time in order to ensure that the stress is in the appropriate range, the pump shaft can not have a larger amount of movement, but the actual design often appear unreasonable factors, making the pump shaft movement is higher than expected, which mechanical seal performance has a large degree Negative Effects.
        3, mechanical seals often leaked
        The longitudinal leakage caused by the damage of the sealed end face has a mechanical seal. The graphite end face is uniformly ring-shaped groove, the annular deep groove produced at the graphite section, the wear of the graphite inner edge, the graphite ring step is worn, , Graphite ring fracture, graphite ring on the corrosion pits, carbide surface cracks and burns.
        Auxiliary seal caused by the frequent leakage failure performance of the end of wear, mosaic ring loose and so on.
        Spring-induced leaks include rotor vibration, loose parts, media problems, and damage to mechanical seal assistance.
        4, other mechanical seal leakage
        In addition to the above several common leak performance, there are mechanical seal vibration is too large, pumping the air caused by the seal leakage, sealing cavity cavitation caused by sealing leakage, sealing the end of the vaporization caused by leakage, pump vibration caused by excessive leakage, There is no flushing seal leaks and so on.more about farmland irrigation water pumps
      Mechanical seal leakage measures
        1, install the faulty equipment
        The appearance of the fault and the actual operation and the internal structure of the machinery have a certain relationship, some incentives will be in a certain situation conditions lead to the occurrence of failure, as long as the relevant incentives can be found through some of the failure to eliminate the failure of equipment incentives. For example, in the pump outlet to install the electrical contact pressure gauge, the pump boiler pump and pump outlet pressure to establish a chain, if the pump out of pressure will automatically power off. In order to prevent the phenomenon of reversing the pump when the pump is automatically pumped, a single flow valve can be added to the automatic pump outlet.
        2, to improve the equipment structure
        Mechanical seal in the structural design there is a certain irrational, these unreasonable structure to increase the risk of leakage of mechanical seals. Under conditions permitting, the structure of the mechanical seal can be redesigned to minimize the risk of leakage. Such as the mechanical seal of the end face are mostly double-end design, double-sided surface to increase the device and the media contact area, thereby increasing the risk of corrosion. From the perspective of security can be double-sided design into a single-ended closed bellows mechanical design.
        3, select the appropriate composition of materials
        Different materials, different corrosion resistance, the corrosive requirements of the mechanical seal composition of the material has good corrosion resistance, if the choice of materials will reduce the equipment life. Ceramics by the chemical nature of the material is not active, it is difficult to react with the media oxidation, so the purchase of mechanical seals can focus on the use of ceramic sealing ring.
        4, to improve the operator's professional skills
        The failure of mechanical seals in addition to the mechanical causes of their own factors, such as the impact of improper operation of the operator does not lead to the occurrence of adverse consequences. In order to eliminate the similar avoidance of errors, it is necessary to carry out professional knowledge training for the operator and develop the instruction manual and precautionary note, promote standard operation, introduce anti-fouling measures, maintain the equipment on a regular basis, and reduce the impact of human factors lowest.
        5, to improve the maintenance effect
        Regular maintenance is an important means of finding problems and preventing problems, but many employees treat it as a general routine, that is to walk through the field, just doing it at the time of maintenance. The work attitude of the staff makes some problems not found at an early stage, and it is too late until the problem breaks out completely. Employees should pay attention to every detail in the maintenance, do not ignore any bit, the company can take some incentives to encourage staff maintenance of the initiative, so as to improve the maintenance effect.
        Boiler pump mechanical seal leakage in the production of intermediate frequency failure, must be targeted to solve the problem, in the analysis of the causes of failure on the basis of equipment to improve the installation of anti-fault equipment, do regular maintenance management, in order to minimize the probability of failure

Specification and use of boiler feed pump inlet filter

Boiler feed pump inlet filter can boiler boiler in the suspended solids, mechanical debris, such as filtering, and according to the size of the pressure on the filter for manual cleaning. The filter can meet the requirements of various working conditions, suitable for a variety of filtration occasions, product performance and quality and stability, according to user requirements for the design, its role is to filter the melt flow and increase the flow resistance, to filter out the mechanical impurities and improve the mix Refining or plasticizing effect.WWW.Dragon-pump.com
 Boiler feed pump inlet filter Technical parameters:
        Type: horizontal, horizontal, flange connection;
        Material: shell carbon steel material, filter and other parts are stainless steel (304 stainless steel, sheet drilling);
        Medium: condensate;
        Design parameters: pressure for the vacuum ~ 0.1MPa.a, the design temperature of 50 ℃;
        Take over the size: Φ325 × 7;
        Length: L ≤ 700;
        Arrangement direction: level;
        Filtering accuracy Φ2;
        Passing rate 1: 4.5;
        Pressure loss <250mm / H20;
        Flow 296t / h;
        With accessories: anti-flange and connectors;
        Quantity: each machine two, the whole plant a total of four;
        The filter design life is 30 years.
      Closed boiler feed pump inlet filter:
        Type: horizontal, horizontal, flange connection;
        Material: shell carbon steel material, filter and other parts are stainless steel (304 stainless steel, sheet drilling);
        Medium: desalted water;
        Design parameters: design pressure 1.6MPa.a, design temperature 50 ℃;
        Take over the size: Φ325 × 7.5;
        Length: L ≤ 800;
        Arrangement direction: level;
        Filtering accuracy Φ2;
        Passing rate 1: 4.5;
        Pressure loss <250mm / H20;
        Flow rate 650t / h;
        With accessories: anti-flange and connectors;
        Quantity: each machine two, the whole plant a total of four;
        Filter design life of 30 years;
        The machines that install the filters become filters that are used to filter natural water and food, and some of the main filters are paint and paint impurities.
      Boiler feed pump inlet filter features:
        Direct filtration, simple process, good air permeability, uniformity and stability, no leakage, good regeneration performance, fast regeneration, easy installation, high efficiency, long service life.More about Boiler pumps manufacturers

      Boiler feed pump inlet filter Uses:
        It is mainly used in air conditioning, purifier, range hood, air cleaner, dehumidifier, and dust collector. It is suitable for all kinds of filtration, dust removal and separation requirements. It is suitable for petroleum, chemical, mineral, food, Painting and other industries of the filter.
        Painting filter material can be divided into two kinds of metal and plastic, filter installed in the gun on the location of different types, such as gun under the filter, the tip of the filter, the general stainless steel and nylon material is better.

Installation of non - clogging submersible sewage pump

No clogging submersible sewage pump installed in what way
(1) submersible pump installation according to the location of the submersible pump can be divided into:
① vertical installation: (vertical) pump installed in the vertical direction of the spindle, the installation of the bracket.Sewage Pump vertical installation is limited by the working environment of the pump (eg piping pumps, submerged pumps, deep well pumps, bobbin pumps, submersible pumps), installation space constraints (vertical marine pumps) and design factors (eg vertical high speed pumps) decided.
② Horizontal installation Install (horizontal) pump according to the horizontal direction of the spindle installed on the foundation, the installation of the bracket, which is the installation of most pumps.
(2) the installation of sewage pump by pump position can be divided into:
① wet installation: the pump part or all installed in the liquid installation method This compact installation, small footprint, can be installed directly in the sewage pool, without the need to build a dedicated pump room to install pumps and motors, you can save a lot Of the land and infrastructure costs, easy installation and maintenance; but the pump's good performance, high insulation performance requirements.
② dry installation: the pump completely placed in the liquid outside the installation, which is the installation of most of the pump, with intuitive maintenance, size is appropriate, the lower requirements of the motor pump, the characteristics of strong adaptability
(3) submersible sewage pump installed by the pump can be moved into
① mobile installation: the pump or its components installed on a removable carrier (such as car) installation method. This installation method is used in small, intermittent use, the use of more occasions.
② fixed type sewage pump: installed: the pump fixed to the foundation or bracket on the installation, is the most commonly used installation.

Boiler feed Pump Operation Precautions and Related Requirements

Boiler feed pump operation considerations and related requirements:
        1, the boiler pump test run before the inspection items are as follows:
        (1) refueling car: check the pump on the oil cup, to the hole within the oil, turbo coupling, turning should be flexible, no abnormal phenomenon;
        (2) check the anchor bolts should be no loosening;
(3) the lubricating parts are added lubricating oil, the need for cooling parts have been filled with cooling oil;
        (4) the instructions instrument, safety protection devices and electronic control devices should be sensitive, accurate and reliable;
        (5) The direction of the motor should be in accordance with the direction of the pump: Before connecting the battery, replace the connection plate (back wheel) to connect the screw, check the motor direction after power, turn the correct direction, and then connect to avoid reverse.
        (6) centrifugal pump must be filled with water and then start, should not be idle. Boiler water pump center, such as lower than the suction surface, you do not need irrigation, just put the pump air can be released. If the boiler water pump center is higher than the suction surface, should first open the suction pipe valve and vent, close the discharge pipe valve, to be vented with water, the speed is normal, then open the outlet pipe valve, and pump regulation To design conditions.
        (7) boiler water pump in the case of closing start, the running time should generally not exceed 2-3 minutes, such as the time is too long, the pump liquid heat, easy to cause accidents, it should be timely parking.
        2, the boiler pump test run when the motor temperature, boiler water pump operation, pressure gauge and vacuum table pointer values, interface tightness, etc. should meet the standard specification requirements, as follows:
        (1) operation should not have abnormal vibration and sound, the precision seal should not be leaked, fastening the connection parts can not be loose;
        (2) bearing temperature rise must comply with the provisions of the equipment manual;
        (3) boiler water pump safety protection box electronic control devices and parts of the instrument to be sensitive, reliable and accurate;
        (4) Boiler pump under the design of the continuous test run time should not be less than 2h;
        (5) the temperature of the shaft seal filler should be normal, without special requirements in the case of ordinary filler leakage shall not be greater than 35-60ml / h;
        (6) The motor current and power should not exceed the rated value.
        3, boiler water pump should stop running after the following requirements:
        First close the pump at the exit of the valve, until the pump cooling and then turn off the auxiliary system of the valve, and then cut off the power to stop the pump;click this website：Dragon-pump.com
       Should be put away the pump to accumulate the liquid to prevent corrosion.

The working principle of frequency conversion feed pump

Frequency conversion is mainly to change the speed of the pump to adjust the flow, of course, there are some pressure control system, relays, solenoid valves, etc., the frequency converter regulator to be supplied by the relay in order to achieve automatic water supply, frequency conversion principle is to change the pump speed To control the displacement, so do not have frequent start and stop. The working principle is to change the speed of the motor according to the working conditions, with the motor speed to adjust the pump conditions
People say that the frequency conversion pump is actually a pump driven by a variable frequency motor. The advantage is to automatically maintain a certain constant pressure pump, so that the pump can work more effectively to meet the requirements of users, saving energy, the use of frequency converter to change the pump speed, to adjust the pump flow and pressure, the inverter in general Have closed-loop control function, can be automatically controlled according to the pressure signal operation, to achieve constant pressure water supply.
Frequency of feed pump working principle:
        1, variable frequency pump frequency conversion energy:
        From the fluid mechanics, P (power) = Q (flow) ╳H (pressure), the flow Q is proportional to the first power of the speed N, the pressure H is proportional to the square of the speed N, the power P is proportional to the cubic of the speed N , If the efficiency of the pump is constant, when the required regulation of flow down, the speed N can be proportional to the decline, while the shaft output power P set the relationship between the decline. That is, the power consumption of the pump motor and the speed of the approximate ratio of the establishment of the relationship. For example: a pump motor power of 55KW, when the speed down to the original speed of 4/5, the power consumption of 28.16KW, saving 48.8%, when the speed dropped to the original speed of 1/2, the power consumption The amount of 6.875KW, saving 87.5%, variable frequency pump power factor compensation for energy saving.CHECK out this website: http://www.dragon-pump.com to know APK company
        Reactive power not only increase the line loss and equipment heat, more important is the power factor to reduce the power grid caused by the reduction of active power, a large number of reactive energy consumption in the line, the use of equipment inefficient and wasteful by the formula P = S ╳COSФ, Q = S╳SINФ, which S-apparent power, P-active power, Q-reactive power, COSφ-power factor, we can see the larger COSФ, the greater the active power P, the general power of the pump motor power factor 0.6-0.7, the use of frequency control device, due to the role of inverter internal filter capacitor, COSФ ≈ 1, thereby reducing the reactive power loss, increasing the active power of the grid.
        2, the frequency of the pump's soft start energy saving:
        As the motor is directly activated or Y / D start, the starting current is equal to (4-7) times the rated current, which will cause serious impact on the mechanical and electrical equipment and power supply network, but also on the grid capacity requirements are too high, High current and vibration on the baffle and the valve damage greatly, the equipment, pipeline life is extremely unfavorable. The use of frequency conversion device, the use of the inverter soft start function will start the current from zero, the maximum does not exceed the rated current, reducing the impact on the power grid and the power supply requirements, extending the use of equipment and valves life. Saving equipment maintenance costs.

What are the feed water pump filter installation methods?

The water pump filter is divided into two types: coarse filter, ordinary filter, precision filter and special fine filter according to their filtration precision (filter size of impurities). They can filter more than 100μm, 10 ~ 100μm , 5 to 10 μm and 1 to 5 μm in size.More about Boiler pump manufacturers.

 When choosing a feed pump filter, consider the following:
        1, the filter accuracy should meet the predetermined requirements. In a long time to maintain adequate flow of energy;
        2, the filter has enough strength, not because of the role of hydraulic damage;
        3, filter corrosion resistance, and can work at a specified temperature for a long time. Filter cleaning or replacement is simple.
Installation of the feed water pump filter in the hydraulic system installation location are usually the following:
        1, to be installed in the suction port of the feed pump:
        Pump oil suction circuit is generally installed with a surface type oil filter, the purpose is to filter out the larger impurity particles to protect the hydraulic pump, in addition to the filter capacity of the filter should be more than twice the pump flow, the pressure loss is less than 0.02MPa.
        2, installed in the outlet pump on the road:
        The purpose of the oil filter installed here is to filter out contaminants that may penetrate valves and other components. Its filtration accuracy should be 10 ~ 15μm, and can withstand the working pressure on the oil and the impact pressure, the pressure drop should be less than 0.35MPa. At the same time should be installed safety valve to prevent the filter plug.
        3, installed in the return pump on the water supply system:
        This installation of indirect filtering effect, generally with the filter and even install a back pressure valve, when the filter block to a certain pressure value, the back pressure valve open. Installed on the system branch oil. Separate filtration system: large hydraulic system can be set up a hydraulic pump and oil filter composed of independent filter circuit. In addition to the entire system required for the oil system, but also often in some important components (such as servo valves, precision throttle valve, etc.) in front of a separate installation of a dedicated fine filter to ensure their normal work.click here
        Feed water pump filter installation, switch valve - filter - bellows / soft connector - feed pump. The pump inlet is installed directly, and the diffusion filter has the function of filtering impurities. It also has stable water flow, prevents cavitation, improves pump efficiency, saves pump inlet diversion tube, and can greatly reduce installation space.

Boiler Pump Valve Parts Material Selection and Troubleshooting

Today, boiler feed pumps manufacturer to take you to learn about the boiler pump valve parts of the material applicable occasions and often encounter fault maintenance methods.
      1, the valve body, bonnet and valve often encounter fault maintenance methods
        phenomenon
        Leakage of valve body and bonnet
        the reason
        Cast iron casting quality is not high, the valve body and valve cover body with trachoma, loose tissue, slag and other defects;
        Day cold cracking;
        Poor welding, there is slag, no welding, stress cracks and other defects;
        The cast iron valve is damaged by heavy objects.
        Maintenance method
        Improve the quality of casting, before the installation in strict accordance with the provisions of strength test;
        The temperature of 0 ° and 0 ° below the valve should be insulated or mixed heat, stop the use of the valve should be excluded from the water;
        The welds of the valve body and bonnet, which are made of welding, shall be carried out in accordance with the relevant welding procedure and shall be tested and tested after welding.
        Do not allow the use of hand hammer impact cast iron and non-metallic valves, large diameter valve installation should be bracket.
        Bonding method
        The use of adhesive curing fast characteristics, in a timely manner near the pin coated with adhesive, the establishment of a new solid seal structure, to stop the purpose of leakage. It is a special function of the use of adhesives with pressure plugging a way.
        Welding method
        In the valve body leakage medium pressure is low, the leakage is small, you can use a more than twice the diameter of the leak more than the nut, so that the leakage medium from the nut out, the nut welded to the valve body, A bolt with the same specifications of the nut, the bottom of the nut placed a rubber pad or asbestos pad, the top of the bolt around the raw tape into the nut, to prevent the purpose of leakage.
        For the leakage medium pressure, leakage of large valve body, drainage welding method can be used. First with a piece of iron, the middle of the opening of a hole, a well with the hole diameter of the isolation valve welded to the iron plate on the hole, open the isolation valve, the iron plate at the central hole at the leakage point fit in the valve body, So that the leakage medium through the iron plate and the isolation valve out of the central valve.
        In the body of the leakage medium high temperature and pressure, but the adjustment valve has a larger shape and size, leakage is not the case can also be used welding method.
 2, the valve seal often encounter fault maintenance methods
        phenomenon:
        Seal at the junction of the seal
        the reason:
        The seal is not tight;
        Sealing ring and the body welding, welding quality is poor;
        Seal connection thread, screw, pressure ring loose;
        The seal is connected and corroded.
        Maintenance method:
        Sealed at the pressure of the leak should be injected with adhesive and then rolling fixed;
        Seal ring should be re-welding according to welding specifications, welding can not repair welding should be removed when the original welding and processing;
        Remove the screws, press the ring to clean, replace the damaged parts, grind the seal and connect the seat seal, reassemble. Corrosion damage to the larger parts, welding, bonding and other methods can be used to repair;
        Seal connection surface is corroded, can be used grinding, bonding and other methods to repair, can not be repaired when the seal should be replaced.
3 valve stem often encounter fault maintenance methods
        phenomenon
        Stem is not flexible
        the reason
        Stem with it with the processing of low precision, with the gap is too small;
        Stem, stem nut, bracket, gland, packing and other axes are not in a straight line;
        Packing pressure too tight;
        Stem bent, damaged;
        Thread is not clean or rusty, poor lubrication conditions;
        Nut loose, thread slip wire;
        The stem is loose or damaged at the connection to the drive.
        Maintenance method:
        Improve the valve stem, stem nuts and other processing accuracy and repair quality, so that the gap should be appropriate;
        When assembling the stem and its connection, the gap is consistent, keep concentric, flexible rotation;
        Packing pressure too tight, the appropriate relaxation gland;
        Stem bending should be corrected, for those who are difficult to correct, should be replaced. When operating the stem, the closing force is appropriate;
        Stem, stem nut thread should always be cleaned and add lubricants, high temperature valves, should be coated with disulfide pins or graphite powder for lubrication;
        Stem nut loose should be repaired, can not repair the timely replacement;
        So that the nuts at the oil flow, lubrication is good, do not often operate the valve, regular inspection and activities about the stem, found that wear and bite the phenomenon of timely repair stem nuts, brackets and other accessories;
        To properly operate the valve, the closing force to be appropriate, so as not to deformation and damage to the valve stem;
        After closing, the valve is hot expansion of the occasion, the valve closed, the interval of a certain time, the hand wheel counterclockwise reverse a little to prevent the stem to death.
4 valve packing often encounter fault maintenance methods
        phenomenon
        Packing at the leak
        the reason
        Packing selection is not right, intolerant medium corrosion, intolerance of high pressure or vacuum valve, high temperature or low temperature use;
        Fill the installation of the wrong, there is a small generation on behalf of large, spiral coiled joints bad, tight under the loose and other defects;
        Packing over the use of the period, has been aging, loss of flexibility;
        Stem precision is not high, there are bending, corrosion, wear and other defects;
        The number of fillings is insufficient, the gland is not pressed;
        Glands, bolts, and other parts are damaged, so that the gland can not be pressed;
        Improper operation, excessive force;
        Gland skew, gland and stem between the gap is too small or too large, resulting in stem wear, packing damage.click this website
        Maintenance method
        The material and type of packing shall be selected according to working conditions;
        According to the relevant provisions of the correct installation of packing, packing should be placed by pressing, the joints should be 30 ℃ or 45 ℃;
        The use of the period is too long, aging, damage to the filler should be replaced;
        Stem bending, after wear should be straightening, repair, serious damage should be promptly replaced;
        Fill should be installed in accordance with the provisions of the number of laps, gland should be symmetrical even tight, pressure sets should be more than 5mm preload gap;
        Damaged glands, bolts and other parts should be repaired or replaced in time;
        Should comply with the operating procedures, in addition to the impact of hand wheel, the normal operation of uniform power;
        Should be evenly symmetrical tighten gland bolts, gland and stem gap is too small, should be appropriate to increase the gap, gland and stem clearance is too large, should be replaced.

What is the difference between a variable frequency boiler pump and a normal boiler pump?

In fact, the key to this problem is to figure out what is the frequency, why should the frequency, know the problem we can easily understand the variable frequency boiler and ordinary boiler pump is different, we often say that the frequency conversion is a motor Frequency conversion process, through the motor frequency to change the motor speed, so as to achieve the flow of the pump and other technical parameters of the adjustment, play a control role.Click to know Feedwater pumps ,
 Frequency converter boiler pump and the difference between ordinary boiler pump:
        1, the variable frequency pump motor is the variable frequency motor, the ordinary motor of the pump motor
        Variable frequency motor design takes into account the motor running to low speed when the heat problem, using a separate powerful fan, anti-frequency converter in the high harmonics also do the corresponding treatment. Frequency conversion pump is the frequency change, used to control the speed, to achieve the required water flow.
        2, frequency control motor and the appearance of the difference between the general motorCheck out this site: http://dragon-pump.com/boiler-feed-pump-for-sale to know boiler feed pump costs and prices.
        The motor is no difference, that is, in front of the motor plus inverter control, inverter motor cooling fan is independent, which is to prevent the motor running for a long time low frequency caused by insufficient heat and specially designed, and ordinary motor cooling fan and motor rotor is This is the biggest difference in appearance.

How to improve the life of the boiler pump control valve

In the industrial automation instrument, the control valve is cumbersome, and the structure is simple, often not be taken seriously. However, it is in the process of pipeline, the working conditions are complex, once the problem, we are busy. Because of its heavy, difficult to find the problem, often effortless, but also involves the system put into operation, the system is complete, adjust the quality, environmental pollution. Today, for everyone to introduce 50 kinds of control valve fault handling methods, after the failure encountered no rush.Click to know Boiler feedwater pumps manufacturers
1, the failure of the boiler pump control valve key inspection of the site:
        1) Body wall
        For the use of high pressure and corrosive media in the occasion of the control valve, the valve body wall is often subject to the impact of media and corrosion, must focus on checking the pressure, corrosion resistance.
        2) seat
        When the valve is in operation, the inner surface of the thread for fixing the valve seat is susceptible to corrosion and the valve seat is loose. For valves operating under high pressure differential, check whether the sealing surface of the valve seat is damaged.
        3) spool
        Spool is the active parts of the valve when working, by the media erosion, the most serious corrosion, maintenance should carefully check the spool parts are corroded, wear, especially in the case of high pressure spool wear more serious (Due to cavitation phenomenon) should be noted. When the spool is damaged, it should be replaced. Also note that the stem also has a similar phenomenon, or loose connection with the spool and so on.
        4) "O" type seals
        "O" type seals and other gaskets are aged, cracked.
        5) PTFE packing
        Should pay attention to PTFE packing, seal grease is aging, with the surface is damaged, should be replaced when necessary.
      2, to improve the control valve to the duration of the method:
        1) large opening work to extend the life method
        Let the start of the valve as far as possible in the maximum opening work, such as 90%. In this way, cavitation, erosion and other damage occurred in the spool head.
        With the spool damage, the flow increases, the corresponding valve and then a little, so continue to damage, and gradually closed, so that the entire spool full use until the spool core and sealing surface damage, can not be used so far.
        At the same time, large opening work gap gap, erosion weakened, which than the beginning of the valve in the middle of the opening and small opening work to improve the life of 1 to 5 times. Such a chemical plant using this method, the valve life increased by 2 times.
        2) reduce the S increase the working opening to improve the life method
        Reduce the S, that is, increase the system in addition to the loss of the control valve, so that the pressure drop to the valve down, in order to ensure that the flow through the control valve, will inevitably increase the valve opening, while the valve pressure drop Cavitation, erosion is also weakened.
        Increase the working opening to improve the life of specific methods are:
        Valve after the orifice throttling consumption pressure drop;
        Close the manual valve in series on the line, to the control valve to obtain a better working opening date.
        It is very simple, convenient and effective to use this method when the valve is selected at the beginning.
        3) Reduce the diameter increase the working opening to improve the life method
        The working opening is increased by reducing the diameter of the valve.
        Reduce the caliber increase the working opening to improve the life of specific methods are:
        For a small size of the valve, such as DN32 replaced DN25;
        The valve body does not change, replace the small valve seat valve seat.
        For example: a chemical plant overhaul when the throttle dgl0 replaced dg8, life increased by 1 times.
        4) Transfer damage to the position to improve the life method
        Transfer the damaged area to a secondary location to protect the sealing surface and throttling surface of the valve seat.
        5) increase the throttling channel to improve the life of the law
        The easiest way to increase the throttling channel is to thicken the seat so that the seat hole grows to form a longer throttling channel.
        On the one hand can make the sudden expansion after the closure of the closure of the extension, from the destruction of the destruction of the location, so that the role away from the sealing surface; the other hand, increased the throttle resistance, reducing the degree of pressure recovery, Erosion weakened.
        Some of the valve seat hole designed to be stepped, wave type, is to increase the resistance, weaken the cavitation. This method is often used when the high pressure valve in the introduction device is used and the old valve is improved.
        6) change the flow to improve the life law
        The flow direction, the cavitation and erosion mainly act on the sealing surface, so that the core of the spool and the valve seat sealing surface are quickly damaged; the flow closure is directed to the direction of flow, cavitation, erosion After throttling, the valve seat sealing surface below, to protect the sealing surface and spool root, extended life.
        Pretending to open the use of the valve, when the extension of the life of the problem is more prominent, just change the flow can extend the life of 1 to 2 times.
        7) use special materials to improve the life method
        For anti-cavitation (broken shapes such as honeycomb dots) and scouring (streamlined trenches), throttle pieces can be made with special materials that are resistant to cavitation and erosion. This special material is 6YC-1, A4 steel, the Secretary too Lai, carbide and so on.
        For corrosion resistance, you can switch to more corrosion-resistant, and have a certain mechanical properties, physical properties of the material. This material is divided into non-metallic materials (such as rubber, PTFE, ceramics, etc.) and metal materials (such as Monel, Hastelloy, etc.) two categories.
        8) change the valve structure to improve the life method
        To change the valve structure or use a longer life valve approach to achieve the purpose of improving life, such as the use of multi-stage valve, anti-cavitation valve, corrosion-resistant valve.
        9) reduce the stroke to improve the diaphragm life method
        For the two-position control valve, when the frequency is very frequent, the diaphragm will soon be broken up and down in the fold, the destruction of the location often in the tray circumference.https://www.dragonapkpump.wordpress.com
        The easiest and most effective way to improve the life of the diaphragm is to reduce the stroke. The reduced stroke value is 1 / 4dg. Such as dgl25 valve, the standard stroke of 60mm, can be reduced to 30mm, reduced by 50%.
        In addition, the following factors can be considered:
        To meet the open and closed conditions to minimize the membrane chamber pressure;
        Improve the finish of the tray and the film

The Solution that Boiler pump control valve jammed or blocked

Boiler pump control valve jammed or blocked，how to solve？
1, cleaning method
        Pipe slag, rust, slag and so on in the throttle, guide parts, the lower valve cover hole caused by blocking or stuck to the spool surface, the guide surface to produce strain and scratches, sealing surface indentation Wait. This often occurs in the new commissioning system and overhaul after the initial operation. This is the most common fault.
In this case, you must disengage the cleaning, remove the slag, such as the sealing surface should be damaged should also be grinding; at the same time to open the plug to flush out from the balance hole into the lower valve cover slag, Rinse. Before putting into operation, let the control valve fully open, the media flow for some time and then into the normal operation.
        2, external scouring method
        For some easy to precipitate, containing solid particles of the medium using ordinary valve adjustment, often in the throttle, the direction of the block, the bottom of the valve cover at the plug at the external flush gas and steam.
        When the valve is blocked or jammed, open the external gas or steam valve, you can not move the valve in the case of the completion of the rinse work, the valve normal operation.click to visit Boiler feedwater pump manufacturer to know more.
        3, install the pipe filter method
        The small diameter of the control valve, especially the ultra-small flow control valve, the throttling gap is small, the media can not have a little bit of slag.
        In case of this situation, it is best to install a filter on the pipe before the valve to ensure that the media passed.
        With the positioner to use the control valve, the locator is not working properly, the gas throttling port clogging is the most common fault.
        Therefore, with the locator work, you must handle the gas source, usually used by the way in the locator before the air supply line installed on the air filter pressure reducing valve.
        4, increase the throttling gap method
        Such as the solid particles in the media or the pipeline was washed out of the welding slag and rust and so on can not pass the throttle caused by plugging, jamming and other failures, you can switch to large throttle gap throttle - throttle area to open Windows, openings of the spool, sleeve, because of its throttle area rather than the distribution of the circumference, the fault can be easily excluded.
        If it is single, double seat valve can be plunger-shaped spool to "V" shaped mouth of the spool, or into a sleeve valve.
        For example, a chemical plant has a two-seat valve often stuck, it is recommended to use the sleeve valve, the problem immediately resolved.
        5, medium scouring method
        The use of the media itself, the erosion of energy, erosion and easy to easily precipitate, easy to plug things, thereby enhancing the valve anti-blocking function.
        Media scouring method common methods are:
        1) to flow closure type;
        2) the use of streamlined valve body;
        3) the throttle placed in the most powerful erosion, the use of this method should pay attention to improve the erosion of the material erosion resistance.
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        6, straight to the corner method
        Straight through the inverted S flow, the flow of complex, upper and lower cavity dead zone, for the precipitation of the media to provide a place. Angular connection, the media is like flowing through the 90 ℃ elbow, scouring performance is good, dead zone is small, easy to design streamline. Therefore, the use of through the control valve to produce a slight plug can be changed into angular valve use.

Vertical Pipeline Sewage Pumps How to Replace Mechanical Seals Properly

Vertical Pipeline Sewage Pumps How to Replace Mechanical Seals Properly
First, the vertical pipeline sewage pump to ensure the quality of parts
Vertical pipe sewage pump mechanical seal in the factory to be done before the sealing performance test, and a certificate. Mechanical seal after long-term operation, so that the dynamic ring and static ring wear, spring and shaft corrosion wear and tear, seal apron wear, aging, deformation, etc., can cause leakage of the seal, must repair or replace the new pieces. The sealing surface of the moving ring and the static ring shall not have cracks, corners, scratches, pits, burrs and partial grinding, scratches, pits can not penetrate the entire sealing face. If the use of the repair of the static and dynamic ring, the dynamic ring of the height of the boss and not less than 3mm, and a single height of not less than lmm, so as not to affect the heat. After the installation of the dynamic ring should be able to ensure flexible movement on the axis, the ring will be able to spring after the spring to spring back to keep the static and dynamic ring vertical and parallel. Static and dynamic ring seal apron specifications in line with the provisions of the drawings, the surface shall not be damaged, uneven thickness and soft and hard uneven phenomenon, in the overhaul to replace the seal apron. The outer surface of the spring is clean and free from corrosion. The length of the spring should be subjected to length profile inspection and pressure test. The pressure difference of each set of springs in the specified compression length should meet the requirements. The pressure error of each set of springs in the specified compression length meets the requirements. Free length tolerance of not more than 0.5mm, the amount of compression can not be too large or too small, the required error ± 2mm. The same type of material can not be used for the sealing sleeve and the pump shaft. The parallelism tolerance of both sides of the end face and the tolerance of the straightness of the axis do not exceed ± 0.20mm.
Second, the vertical pipeline sewage pump to ensure adequate cooling and lubrication
Adjust the opening of the cooling line control valve to ensure that the mechanical seal cooling pipe is smooth, the tank can open the drain valve to clean the cavity gas.click this page:http://www.dragon-pump.com/
Third, the vertical pipeline sewage pump to ensure the installation accuracy
Disassembly pump mechanical seal, the static and dynamic ring to clean, and in the friction side of the face coated with a small amount of clean lubricants, to take into account the high pressure side and low pressure side, is strictly prohibited bump. Static ring gland installation force to be uniform, to prevent the pressure deviation, with the feeler check, up and down the left and right position of the deviation of not more than 0.05mm; check gland and shaft diameter with the gap, the surrounding to be uniform, Greater than 0.1ram. Install the pump mechanical seal parts of the pump shaft radial runout does not exceed 0.05mm. Put the pump cover and seal the cover before, please carefully review the mechanical seal installation positioning size, if the positioning size does not meet the requirements, can be adjusted in the axle with steel pad, but the steel pad to high accuracy, thickness difference of not more than 0.01mm The Measure the radial runout of the mechanical seal and the end face of the sealing surface to meet the requirements.
On the running of the mechanical seal, where a gland loose to move the sealing surface of the situation, the static and dynamic ring parts must be replaced, should not be re-tightened to continue to use. Because in such a loose, the original friction trajectory will change, the contact surface of the sealing performance is very easy to be destroyed.
Fourth, the vertical pipeline sewage pump to adjust the face pressure
The end face pressure is an important parameter related to the sealing performance and service life, which is related to the seal structure type, spring size and medium pressure. The end face than the pressure of the general plus bad friction vice; than the pressure is small easy to leak, often given by the manufacturer a suitable range, the end of the general pressure to take 3 ~ 6kg / cm2. Adjusting the pressure is to adjust the compression size of the spring. The free length of the spring is denoted by A, and the spring load produces the unit load when the load is k, and the required specific pressure is expressed by P, which are the parameters given by the manufacturer. After compression, the size is denoted by B, then P / A-13 = k, and 13 = A-e / k, which is the size of the spring-loaded compression. If the size of the spring after installation is too large, you can increase the thickness of the adjustment pad between the spring seat and the spring, the size is too small to reduce the adjusted thickness, adjust the thickness of the pad with a micrometer.

What are the factors that affect the boiler feed pump power?

In practice, there are often unreasonable phenomena: one situation is that the power rate reserve factor is chosen to be too small to overload the power machine, the boiler feed water pump unit can not run normally, and even the power machine has the risk of burning, and the other is the power The standby factor is too large, the power load is insufficient, and the performance of the power machine can not be fully utilized. The power and power factor of the power machine can be reduced, which will increase the power consumption and cause no waste.
In view of the above problems, this paper gives the expression of the reliability of the reliability of the operation of the pump unit from the angle of the operation of the pump and the power machine. The standby ratio of the power rate and the reliability of the unit operation are established, and the probability statistical method is established The calculation model of the reliability of the pump unit is given, and a practical calculation method is given, which provides a scientific basis for the reasonable matching of the pump and the power machine. For the water pump type and the different power rate reserve factor, the pump unit is reliable The calculation results are analyzed and the valuable conclusions are drawn.
      Factors affecting the power of the boiler feed pump:
        1, the boiler pump itself is the most fundamental impact of power. The same operating conditions of the pump, the power can be a difference of more than 15%.
        2, the boiler pump operating conditions lower than the pump's additional conditions, low pump efficiency, high energy consumption.
        3, the motor power in the use of simply insist on the same. It is therefore important to pick a high-power motor.
        4, the impact of boiler power is mainly concerned with the quality of the description and production. Pump selected, the latter part of the impact of smaller.
        5, hydraulic loss includes hydraulic conflict and some resistance loss. Boiler pump running time, inevitably the formation of impeller and guide vane and other parts of the appearance of wear and tear, increased hydraulic loss, reduced hydraulic power.
        6, the boiler pump volume loss, also known as missing leaks, including impeller seal ring, interstage, axial force balance organization three leaks lost. Volume of the power of the bump is not only related to the description of the production, but also with the later processing. After a continuous operation of the pump, because the conflict between the various components, the gap increases, the volume of power reduced.
        7, because the filter cylinder blockage, pipeline intake and other reasons to form a centrifugal pump pumping and idle.
        8, the boiler pump before the start, the workers do not pay attention to the centrifugal boiler pump before the start of the preparatory work, warm pump, disk pump, irrigation pump and other basic operating procedures to perform incomplete, often the formation of pump cavitation, resulting in pump noise, , Low pump efficiency.
        The general boiler pump is designed to achieve the highest power, that is, the boiler boiler hydraulic layout parameter is the best combination of the highest power. For other pumps, this type of pump with special requirements can not go beyond the same period of boiler power. Other pump power below the boiler pump is the primary reason for their over-current channel widened. The value of the power reduction is primarily related to the degree of widening. Other pump runner widening is to avoid clogging. IS, IH-type boiler pump for the delivery of water or physical and chemical properties similar to other liquids used in water.

The installation method and inspection method of pump pipe and drive shaft of deep well submersible pump

What is the installation method and inspection method of pump tubing and drive shaft of deep well submersible pump?welcome to wholesale qj deep well submersible pump.
Deep well submersible pumps are installed as follows:
    ① lift the pump under the short tube, hanging on the board should be sliding on the board or with a rope to lift the end of the tube, so that it does not contact with other objects to protect the pipe end thread from damage. When lifting the pump pipe, apply the rope to tighten the drive shaft so that it does not fall. Do not use the hand drive shaft to prevent the transmission shaft from bending.
    ② After lifting the pump tube, it should be on the same axis as the pump section. The end of the shaft shaft rotation in the pump section of the shaft end of the thread, the shaft should be spin to the middle of the distal end of the shaft, and add a very small amount of lubricating oil for lubrication purposes, excessive lubricants will bring harm to the rubber bearings. Slightly lower the pump tubing, loosen the drive shaft to fasten the rope and screw the shaft end of the drive shaft into the axle section mounted on the shaft end of the pump until the two drive shaft ends are in contact with each other. Down the pump tube, the pump pipe screw into the pump section tube, with a chain clamp tightening.
    Slightly lift the pumped parts and release the lower splint and carefully lift the pump into the well until the pipe clamp rests on the square.
    ③ In accordance with the above method, the pump pipe and the drive shaft are installed on a row-by-block basis until the pump tubing is installed.
    Vertical Deep well submersible pump inspection method:
Inspection of pump tubing and pump shaft installation In order to ensure the installation quality of pump tubing and pump shaft, the position of the drive shaft and the length of the drive shaft protruding from the tube bundle should be checked step by step in the installation of each pump and pump shaft If the drive shaft is not deformed by external force, its position should be on the center line of the pump pipe. According to the length of the drive shaft out of the tube dome, it can be determined whether the end of the drive shaft and the pump pipe end face are closely connected The
    You can also check the following: After each pump tubing and drive shaft is installed, you can use the tool (or by means of a tool) to rotate the drive shaft to see if it can be turned. If the installation of a sudden feeling of the drive shaft after the friction increased more, or even difficult to turn, indicating that the pump tube and drive shaft is not installed, it should be opened, check the reasons after the re-install until the request so far The

Boiler water pump how to calculate the head

Heating and Closed Circulation System of the water pump head = water supply head to fill the point of the pressure head - the supply tank water level + replenishment pipeline itself along the head and the local head loss and the sum.
  Boiler water pump flow and head calculation formula:
        The effective energy obtained by the unit weight of the liquid flowing through the pump. Is the pump's important performance parameters, also known as pressure head. Can be expressed as the pressure of the fluid head, kinetic energy head and bit energy head increases, that is
        H = (p2 - p1) / ρg + (c2 ^ 2 - c1 ^ 2) / 2g + z2 - z1
        Where H - head, m;
        P1, p2 - pump inlet and outlet of the liquid pressure, Pa;
        C1, c2 - fluid at the pump inlet and outlet flow rate, m / s;
        Z1, z2 - import and export height, m;
        Ρ - liquid density, kg / m3;
        G - gravity acceleration, m / s2.
        Replenishment pumps and feed pumps are calculated in the same way. The flow rate of the replenishment pump Q is determined by the need, that is, the amount of boiler water per unit time.
        The head of the replenishment pump is determined by the height of the water, the head of the boiler pressure, and the loss of the head along the pipeline and the head loss. The pipe length is L, the resistance coefficient is k, the resistance coefficient is j, the height of water is Z, the boiler pressure is P, the density of water is p, and the acceleration of gravity is expressed by g, then the water pump head: H = Z + P / (pg) + (kL / D) V ^ 2 / (2g) + jV ^ 2 / (2g) where the average velocity V = 4Q / (3.14D ^ 2) and D is the tube diameter. For the circulating pump, the flow of course depends on the need, the flow is determined, calculate the total return of the loop is the head of the water pump head.
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