To keep mechanical seal systems functioning as long as possible, we recommend using standardized seal piping plans. Detailed API seal piping plans ensure minimal seal face wear by maintaining the optimal seal chamber environment.
Since they were first formulated, seal piping plans have been maintained and remodeled by the American Petroleum Institute (API). Current plans are based on API 682 and are sorted numerically. In some cases, designated letters are also used to differentiate between plans.
Filter Plan Types
API Plan 72
Externally supplied buffer gas maintained at a pressure less than the seal chamber pressure.
API Plan 74
Externally supplied barrier gas maintained at a pressure greater than the seal chamber pressure.
API Plan 75
Leakage collection system for condensing or mixed phase leakage with a contacting containment seal.
