Page 287 - Compression Machinery for Oil and Gas

272 SECTION II Types of Equipment

FIG. 6.18 Single mechanical seal.

FIG. 6.19 Double mechanical seal.

limited by orifices at the outlet. In case of a single mechanical seal the outboard
oil flow is limited by a restrictive ring.
The main part of the oil leaves the annulus either on top of the chamber or in
the outboard direction through dedicated orifices. A small amount of oil leaks in
the inboard direction. This leak oil is routed together with gas from the carbon
ring bushings to an oil separator, where the oil is separated and the gas is fed