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BRAMHALL TERMINAL – BRM-SIS1 ANNUNCIATOR RELAY REPLACEMENT
PHILLIPS 66
16089RPT205B
PAGE 9
4.2 Proposed Modification
Description
Replace annunciator alarm repeat relays with units from a
different supplier
Proposed
Safety Integrity Level
Not Applicable, Status signal only
Reason for the
Modification
T
he terminal has been experiencing failures of the annunciator
repeat relay during Nivotester pushbutton simulation testing. The
Nivotester simulation test cycles the relay twice before returning
healthy, several units have failed to return healthy leaving a high high
high level alarm active. The relay is not part of the safety instrumented
system, safety integrity level (SIL) calculations and does not affect
the safety instrument function (SIF) of high high high level closing V1
ESD valve.
Hazards which may be
affected by the
modification
None
Impact on functional
safety as a result of the
proposed modification
None, units not SIL rated