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