MSS Standard SP-61

MSS Standard SP-61

MSS Standard SP-61, from the Manufacturers Standardization Society, establishes leakage allowances and provides guidance for testing valves typically used in “full open” and “full closed” service, such as check, isolation, and stop valves. It is not intended for use with control valves. The current version of MSS SP-61 was released in 2013.

Scope

MSS SP-61 covers shell and seat closure pressure testing of valves.

Tests

MSS SP-61 specifies the following tests:

TEST	PURPOSE
Production pressure test Closure member test Shell leakage test	Verify the valve’s pressure containing capability
Shell leakage test	Verify the pressure containing capability of the external pressure boundary
Seat and closure member test	Verify performance of flow regulating elements within the valve
No visible leakage	Verify that there is no visible weeping (liquid test) or bubbling (air test)

A full copy of MSS SP-61, with complete testing procedures and specifications, can be purchased from the Manufacturers Standardization Society.