ISA TR96.05.01

Abstract

ANSI/ISA-TR96.05.01 is informative and does not contain any mandatory requirements. <br>ANSI/ISA-TR96.05.01 is limited to automated valves normally operating in either a full open or full closed position. <br>The boundary of the automated valve includes the following: <br>a) Limit switches and other monitoring devices <br>b) Air regulation and filtration system <br>c) Actuated valves whose fail position is specified as spring-return fail closed, spring-return fail open, or double acting <br>d) Valve body specified to meet the functional requirements for its application <br>ANSI/ISA-TR96.05.01 does not address automated valves used for regulatory control applications. <br>Guidance is provided on the following: <br>a) Identifying when partial stroke testing may be useful <br>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 <br>c) The advantages and disadvantages of three basic types of partial stroke test methods: mechanical limiting, positioners, and solenoid operated valves <br>d) The use of diagnostic coverage factors in the performance calculations for an automated block valve being partial stroke tested periodically