Safety Instrumented System (SIS) System testing is an important activity to follow the required Quality control achieved for the system.
SIS testing ensures that all planned, designed aspects of SIS are covered.
Below are the brief tests to be followed:
Testing a virtually error-free system doesn’t consume much time, the project can follow the schedule & avoid delays.
A robust testing plan can help to discover and rectify faults (if any) well before commissioning.
Non-conformance of the SIS system leads to complete re-work of hardware manufacturing, installation, testing, and commissioning.
Engineering efforts will be more and results in higher project expenditure.
Logic solver memory may be a challenge when the new program is created due to non-completion of testing and eventually ending up with major software logic change.
Plan to be developed with clear scope & objectives for all test needs for SIS system testing.
Below are different tests that need to be performed.
System testing procedure document to be prepared upfront before the start of the test.
All the above-mentioned test documents are to be signed off by the testing Engineer with a witness Engineer/Operator/Maintenance supervisor/Technician who is involved in these testing.
All individual testing procedures shall have Passed/Not passed/Comments if any.
Maintain final SRS, Cause & Effect Matrix, Logic narratives/drawings, wiring loop drawing for check ahead of tests.
Master test document to be maintained and any update/ changes per comments need to be signed off by respective personnel.
With the above SIS, system testing keeps below records for tracking the punch list and closing out as there could be any fault found during the test.
A few punch list review tracking details are as follows.
Thus it is important to perform the SIS system testing in order to ensure that no faults exist in hardware, software application program, and communication with the other systems.
Completion of all such tests during the Design finalization & Engineering phase will assure the project’s successful completion per schedule.
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