Pump mechanical seal failure analysis

Mechanical seal means two sealing elements perpendicular to the axis of the smooth and flat surface bonded to each other and constituting the sealing relative to the rotation of the device. It usually consists of stationary ring , ring , spring loading device ( including the thrust ring , spring , spring seat , fixing screws , drive pin ) , the auxiliary ring ( ring ring seals and static seals ) and other components . Anti-rotation pin fixed to the gland to prevent static ring rotation.
From a structural point of view, the mechanical seal is easy to leak mainly axial seal , change the seal easily leaks . Because of mechanical seal has sealing performance , reliable, leak less , long life, low power consumption , does not require frequent maintenance, etc. , and can meet the production automation and high temperature , releasable cable ties low temperature, high pressure, high vacuum , high speed, a variety of explosive , corrosive and corrosive media sealing requirements , thus to obtain more rapidly than other sealing the development and promotion of more and more alternative packing seal and other seals .
Early failure of the mechanical seal now common phenomenon , causes and remedies described below:
A new face early wear and tear causes and solutions
Mechanical seal face common cause early wear and tear are the following .
1.1 motorized ring and stationary ring material selection is appropriate
By the ring and static friction ring is composed of the most important parts of the mechanical seal . Seal life and work quality ( leakage index ) are and it has a direct relationship .
Mechanical seal friction material according to the nature of the pump working medium , working pressure , temperature, rotation speed and other factors to choose, especially for old products on mechanical seal or packing seal retrofit transformation of the original mechanical seals , mechanical seals rational choice material is very important. When the mechanical seal in a corrosive medium, it is subjected to a chemical and galvanic corrosion , particularly in the friction surface , the corrosion rate is great , it is just because the end surface of the corrosion product is generated ( to reduce the corrosion rate ) was friction cause damage .bolt security seals This generated by corrosion-resistant surface to rub off , periodic cycles of more than, often referred to abrasion phenomenon . The abrasion rate of about no friction surface corrosion rate of 10 to 50 times . Therefore, the friction should choose both corrosion resistance and good wear resistance of materials . Generally , graphite impregnated with phenolic resin acid not alkali , acid and also alkali impregnated furan resin , epoxy resin impregnated alkali resistance , impregnated with PTFE resin and ceramic capability corrosive media .