Precautions For Installation Of Pipeline Sewage Pump

Mar 14, 2025

When disassembling and assembling the mechanical seal of the pipeline sewage pump to ensure installation accuracy, the dynamic and static rings should be cleaned thoroughly, and a small amount of clean lubricating oil should be applied to the friction surface. Both the high-pressure and low-pressure ends should be taken into account, and collision is strictly prohibited.
When installing the static ring cover, the force should be evenly applied to prevent pressure deviation. Use a feeler gauge to check, and the deviation in the up, down, left, and right positions should not exceed 0.05mm; Check the fit clearance between the gland and the outer diameter of the shaft, which should be uniform around and the allowable deviation at each point should not exceed 0.1ram The radial runout of the pump shaft for installing the mechanical seal of the water pump shall not exceed 0.05mm Before installing the pump cover and sealing end cover, it is necessary to carefully review the installation positioning dimensions of the mechanical seal. If the positioning dimensions do not meet the requirements, steel pads can be used in the shaft sleeve for adjustment, but the accuracy of the steel pads should be high, and the thickness difference should not exceed 0.01mm The radial runout of the mechanical seal sleeve and the end face runout of the sealing surface measured meet the requirements.

For mechanical seals that have been operated, if the sealing cover is loose and causes the sealing surface to move, the dynamic and static ring parts must be replaced and should never be tightened again for continued use.
Because after loosening in this way, the original motion trajectory of the friction pair will change, and the sealing performance of the contact surface is easily damaged.
The mechanical seal of the pipeline sewage pump must undergo a sealing performance test and have a certificate of conformity before leaving the factory.
After long-term operation, mechanical seals can cause leakage due to wear and tear of the moving and stationary rings, corrosion and wear of the spring and shaft, wear, aging, deformation of the sealing rubber ring, etc., and must be repaired or replaced with new parts.
The sealing surfaces of the dynamic and static rings must not have cracks, missing corners, scratches, pitting, burrs, or uneven wear. Scratches and pitting should not penetrate the entire sealing surface. If using repaired dynamic and static rings, the sum of the heights of the protrusions of the dynamic and static rings should not be less than 3mm, and the height of a single protrusion should not be less than 1mm to avoid affecting heat dissipation.
After installation, the dynamic ring should be able to move flexibly on the shaft, and when pressed against the spring, it should be able to bounce back freely, keeping the dynamic and static rings vertical and parallel. The specifications of the dynamic and static sealing rubber rings shall comply with the drawing requirements, and the surface shall not have any damage, uneven thickness, or uneven hardness. The sealing rubber rings shall be replaced during major repairs.
The outer surface of the spring should be clean and free of rust. Before use, it should undergo length and shape inspection and pressure testing. The pressure difference of each group of springs at the specified compression length should meet the requirements, and the pressure error of each group of springs at the specified compression length should meet the requirements. The allowable deviation of free length shall not exceed 0.5mm, and the compression amount shall not be too large or too small, with a required error of ± 2mm The sealing sleeve and pump shaft cannot be made of the same material, and the allowable deviation of parallelism and non perpendicularity to the axis on both sides should not exceed ± 0.20mm