Instruction Manual Supplement
D103401X012
ED, ES, ET, EW, EZ, HP Valves
November 2017
10
Operation and Maintenance
Suggested Proof Test
The objective of proof testing is to detect failures within an ED, ES, ET, EW, EZ, or HP valve that are not detected by any
automatic diagnostics of the system. Of main concern are undetected failures that prevent the Safety Instrumented
Function from performing its intended function.
The frequency of proof testing, or the proof test interval, is to be determined in reliability calculations for the Safety
Instrumented Functions for which an ED, ES, ET, EW, EZ, or HP valve is applied. The proof tests must be performed
more frequently than or as frequently as specified in the calculation in order to maintain the required Safety Integrity
of the Safety Instrumented Function.
The proof test shown in table 1 is recommended. The results of the proof test should be recorded and any failures that
are detected and that compromise functional safety should be reported to Emerson Process Management. The
suggested proof test consists of a full stroke of the ED, ES, ET, EW, EZ, or HP valve.
The person(s) performing the proof test of an ED, ES, ET, EW, EZ, or HP valve should be trained in SIS operations,
including bypass procedures, valve maintenance and company Management of Change procedures. No special tools
are required.
Repair and replacement
Repair procedures in the appropriate valve instruction manual must be followed.
Manufacturer Notification
Any failures that are detected and that compromise functional safety should be reported to Emerson Automation
Solutions. Please contact your
Emerson sales office
or Local Business Partner.
