Double Mechanical Seals (with english subtitles) 

Glad it was helpful!

Glad it was helpful!

We have some videos in hindi also. We will make more.

Bearings are to support shaft and hydraulic forces ( axial and radial). However if bearing are defective, mechanical seal will get damage. Hence bearing play important role to enhance life of mechanical seal.

OKAY, will try to make

Whether you choose a barrier fluid or a buffer fluid for your mechanical seal depends on the sealing arrangement of your system. A barrier fluid should be used in an application that uses pressurized dual seals. This system includes a way to pressurize the barrier fluid that is being used. When the fluid becomes pressurized, a barrier is formed between the atmosphere and pumped fluid, and it circulates to ensure the mechanical seal is completely protected. A buffer fluid should be used with unpressurized systems. In this type of system, the fluid is kept within a reservoir with supply lines that are connected to the mechanical seal itself. An internal circulating device will then circulate the fluid throughout the seal. Both barrier fluids and buffer fluids protect your mechanical seal by preventing process material leaks, controlling friction, and providing lubrication.

What will happen if the buffer pressure is more than pump operating pressure in the tandem arrangment??? What will happen if the barrier fluid pressure less than the pump operating pressure in back to back arrangment???

Outboard seal is towards pump coupling side and inboard seal is towards impeller side. The leakage of outboard seal will occur in atmosphere and inboard seal failure will increase pump discharge flow.