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.