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API Plan 54 is a pressurized external lubrication system (PELS) and has specific advantages over Plan 53A, B and C. The primary difference is that with a Plan 53 piping plan, the circulation rate required to cool and lubricate the mechanical seal is dependent on the size, internal circulation device and piping.

API Plan 54 is a custom engineered system that delivers a pressurized barrier fluid to the seal chamber. The barrier liquid is circulated to and from the seal chamber via a pump located on an external reservoir. This fluid is maintained at a pressure greater than that found in the seal chamber.

API Plan 51 is a quench system for use on the atmospheric side of a single seal. This system acts as a dead-ended reservoir for a fluid. API Plan 51. Kit contents shown solid and include some optional components.

The Plan 54's normal operating pressure remains constant in relation to seal leakage unlike a Plan 53B where normal operating pressure decreases with leakage. One Plan 54 can service one or multiple mechanical seals.

Oil seals normally consist of three basic components: the sealing element, the metal case, and garter spring.

Plan 61is sometimes used if the end user has a special or as yet undefined future use for the connections. Flush, Quench and Drain connections are supplied and plugged with plastic plugs.

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.