1.2 Acronyms
FMEDA Failure Modes, Effects and Diagnostic Analysis
HFT Hardware Fault Tolerance
MOC Management of Change: These are specific procedures often done when performing any
work activities in compliance with government regulatory authorities
PFDavg Average Probability of Failure on Demand
SFF 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.
SIF Safety Instrumented Function, a set of equipment intended to reduce the risk due to a
specific hazard (a safety loop).
SIL 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.
SIS 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).
1.3 Product Support
Please refer to the back cover for your regional Flowserve contact details.
1.4 Related Literature
Hardware Documents:
Valtek Mark Series Control Valve Installation, Operation, and Maintenance Instructions
Valtek Mark Series Control Valve Brochures and Technical Bulletins
Guidelines/References:
Safety Integrity Level Selection – Systematic Methods Including Layer of Protection Analysis, ISBN 1-
55617-777-1, ISA
Control System Safety Evaluation and Reliability, 2nd Edition, ISBN 1-55617-638-8, ISA
Safety Instrumented Systems Verification, Practical Probabilistic Calculations, ISBN 1-55617-909-9,
ISA
1.5 Reference Standards
Functional Safety
IEC 61508: 2000 Functional safety of electrical/electronic/ programmable electronic safety-related
systems
ANSI/ISA 84.00.01-2004 (IEC 61511 Mod.) Functional Safety – Safety Instrumented Systems for the
Process Industry Sector
To Next Page
Loading...
Need help?
General
