An important aspect of the design of a gas compressor is the mechanical seal. A mechanical seal minimizes or eliminates the leakage of gas at the interface between a rotating shaft and the stationary housing.

Tip #1: Choose the Correct Materials

Choose the correct materials of construction for the application.  The materials selected must endure the temperature extremes, pressure differentials and be tolerant of the corrosive process gases of the specific gas compressor application. Additionally, the sealing face materials must have proper resistance to friction, frictional heat and resistance to wear. One of various grades of mechanical carbon are often chosen for the sealing faces

Tip #2:  Consider the Form of Lubrication 

All friction mechanical seals require some form of lubrication to lubricate, cool and help seal the gases in the gas compressor. Pre-lubing the seal faces and seal cavities will best protect the components during start up and the first moments of operation. Waiting for the lube system to get lubricant to all areas of the seal after start up can have a detrimental effect on the seal’s longevity.

Tip #3: Check the Spring System

The sealing faces of a mechanical seal are pushed together by some form of spring system. Before assembling the seal onto the shaft, confirm that the spring system is freely working, and not hung up, by pressing gently against the primary ring assembly, taking caution to avoid direct contact of the sealing surface with your hand.

Tip #4: Make Sure to Install Your Mechanical Seal Correctly

This tip is specific to Ro-Flo’s Single Face Mechanical Seal. Specifically, installing the seal onto the sliding vane compressor. Refer to the diagram below for the specific component names. The first step of the installation is sliding the mating ring into place. Due to the o-ring on the inside diameter of the mating ring, this is a snug fit and some effort is required to slide it onto the shaft. The sealing face of the mating ring is highly polished, providing the best sealing surface. It is important that this face, where the carbon primary ring contacts it, does not get scratched, dinged or left pitted due to corrosion from salty finger prints. And here’s the tip: use the Locking Sleeve to push the mating ring down the shaft. This will keep the mating ring square to the shaft, preventing it from getting cocked and stuck, and keep your hands off the sealing face.

single face mechanical seal

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