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The International Society of Automation , 05/04/2008
Publisher: ISA
File Format: PDF
$36.00$73.00
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
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