ISA TR96.05.01

ANSI/ISA-TR96.05.01 is informative and does not contain any mandatory requirements.

ANSI/ISA-TR96.05.01 is limited to automated valves normally operating in either a full open or full closed position.

The boundary of the automated valve includes the following:

a) Limit switches and other monitoring devices

b) Air regulation and filtration system

c) Actuated valves whose fail position is specified as spring-return fail closed, spring-return fail open, or double acting

d) Valve body specified to meet the functional requirements for its application

ANSI/ISA-TR96.05.01 does not address automated valves used for regulatory control applications.

Guidance is provided on the following:

a) Identifying when partial stroke testing may be useful

b) Various criteria to consider when selecting the partial stroke method, e.g., automated versus manual test execution, spurious trip potential, and on-line maintainability

c) The advantages and disadvantages of three basic types of partial stroke test methods: mechanical limiting, positioners, and solenoid operated valves

d) The use of diagnostic coverage factors in the performance calculations for an automated block valve being partial stroke tested periodically