Masoneilan Products SVI II ESD - GE Energy

Safety Information
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 calculations 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 compromise functional safety to the factory.
Table 1 Proof Test Steps
PST
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.
Energize 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
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, including bypass procedures, maintenance and company
Management of Change procedures. No special tools are required.
11