Acronyms - Baker Hughes Masoneilan SVI II ESD Quick Start Manual

Fail 
Annunciation 
Undetected
Fail 
Annunciation
Detected
Fail No Effect
Low Demand
Mode

Acronyms

The following acronyms are related to safety functions of the SVI II ESD and are used throughout
this document.
FMEDA
HFT
MOC
PFDavg
PST
SFF
SIF
SIL
SIS
10 | =BHGE
Failure that does not cause a false trip or prevent the safety function
but does cause loss of an automatic diagnostic and is not detected
by another diagnostic.
Failure that does not cause a false trip or prevent the safety function
but does cause loss of an automatic diagnostic or false diagnostic
indication.
Failure of a component that is part of the safety function but that has
no effect on the safety function.
Mode where the frequency of demands for operation made on a
safety-related system is no greater than twice the proof test 
frequency.
Failure Modes, Effects and Diagnostic Analysis
Hardware Fault Tolerance
Management of Change. These are specific procedures often done
when performing any work activities in compliance with government
regulatory authorities.
Average Probability of Failure on Demand
Partial Stroke Test, a test used to detect failure modes in the PST Con-
troller, actuator, and valve assembly.
Safe Failure Fraction, the fraction of the overall failure rate of a
device that results in either a safe fault or a diagnosed unsafe fault.
Safety Instrumented Function, a set of equipment intended to reduce
the risk due to a specific hazard (a safety loop).
Safety Integrity Level, discrete level (one out of a possible four) for
specifying the safety integrity requirements of the safety functions to
be allocated to the E/E/PE safety-related systems where Safety
Integrity Level 4 has the highest level of safety integrity and Safety
Integrity Level 1 has the lowest.
Safety Instrumented System – Implementation of one or more Safety
Instrumented Functions. A SIS is composed of any combination of
sensor (s), logic solver (s), and final element (s).
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