Baker Hughes Masoneilan SVI II ESD, Быстрый старт

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Proof Test
You can also manually run a proof test to detect failures within an SVI II ESD and ESD 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 calcu-
lations for the safety instrumented functions for which an SVI II ESD is applied. The proof tests
must be performed more frequently or as frequently as specified in the calculation in order to
maintain the required safety integrity of the safety instrumented function.
The following proof test is recommended. Report any failures that are detected and that compro-
mise functional safety to the factory.
This test detects approximately 99% of possible DU failures in the SVI II ESD (Proof Test Coverage).
The person (s) performing the proof test of an SVI II ESD must be trained in SIS operations, includ-
ing bypass procedures, maintenance and company Management of Change procedures. No
special tools are required.
Table 1: Proof Test Steps
Step Action
1
Read the SVI II ESD data record using a HART
®
handheld device or ValVue ESD
software. Resolve any active faults before proceeding.
2
Bypass the valve, or isolate or take other appropriate action to avoid a false trip,
following company Management of Change (MOC) procedures
3
Inspect the SVI II ESD for dirty or clogged ports and other physical damage
4
De-energize the SVI II ESD and observe that the actuator and valve move. Ener-
gize the SVI II ESD after the valve has moved its full stroke length.
5
Inspect the SVI II ESD for dirt, corrosion or excessive moisture. Clean if necessary
and take corrective action to properly clean the air supply. This is done to avoid
incipient failures due to dirty air.
6
Record any failures in your company’s SIF inspection database. Restore the loop
to full operation.
7
Remove the bypass or otherwise restore normal operation