A
I&M
V 9629 R6
Solenoid Valves used in Safety
Instrumented Systems
Operating M anual in accordance w ith IEC
61508
SCO Valves ®
©ASCO Va lv e, I nc. 50 Hanov er Ro ad, F lo rham P a rk , New Jers ey 0793 2 ww w.as co v alve .co m E264756-04/2016 All Rights Reserved
Page 1 of 7
Table of
1 Introduction
1.1 Terms and Abbreviations
1.2 Acronyms
2 Designing a Safety Instrumented Function using an ASCO Solenoid Valve. ...... ....... ....
2.1 Safety Function
2.2 Environmental limits
2.3 Application limits
2.4 Design Verification
2.5 SIL Capability
2.5.1 Systematic Integrity
2.5.2 Random Integrity
3 Installation and Commissioning
3.1 Installa tion
3.2 Response
4 Operation and Maintenance
4.1 Proof test without automatic
4.2 Proof test with automatic partial valve stroke testing ........................ ......................... ....
4.3 Repair and replacement
4.4 ASCO Notification
5 ASCO Solenoid Pilot Valves
6 Status of the document
6.1 Releases
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Time ............................................................................................................6
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testing..............................................................................6
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Covered...............................................................................7
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Contents
4
6
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I&M No
V 9629 R6
All Rights Reserved
1
Introduction
This Operating Manual provides the necessary information to design, install, verify and maintain a
Instrumented Function (SIF) utilizing an ASCO Solenoid Valve. This manual provides necessary
for meeting the IEC 61508 or IEC 61511 functional safety
requirements
standards.
1.1 Terms and
•
Process Valve Any valve that is used to control the flow of media being used in a
•
Pilot Valve A 3-way or 4-way valve that is used t o send or remove pressurized
•
Direct Acting Refers to a solenoid valves main orifice that is opened and closed as
•
Indirect Acting Refers to a solenoid valve’s main orifice that is opened and closed as
•
Safety Freedom from unacceptable risk of
•
Functional Safety The ability of a system to carry out the actions necessary to achieve or
•
Basic Safety The equipment must be designed and manufactured such that it
•
Safety Assessment The investigation to arrive at a judgment - based on evidence - of
•
Fail-Safe State The state where the solenoid is de-energized and its return spring
•
Fail Safe Failure that causes the valve to go to the defined fail-safe state without
•
Fail Dangerous Failure that does not respond to a demand from the process (i.e.
•
Fail Dangerous Undetected (DU) Failure that is dangerous and that is not being diagnosed
•
Fail Dangerous Detected (DD) Failure that is dangerous but is detected by automatic stroke
•
Fail No Effect Failure of a component that is part of the safety function but that has
•
Low Demand Mode Mode, where the frequency of demands for operation made on a
1.2
Acronyms
•
FMEDA Failure Modes, Effects and Diagnostic
•
HFT Hardware Fault
•
MOC Management of Change: These are specific procedures often done
•
PFD
AVG
Abbreviations
For the purpose of this document, this is usually a 2-way valve
movement is being controlled by an actuator and pilot
to and from an actuator for the opening and closing of a process
direct result of the solenoid valves electromagnetic movement when
coil is energized and
result of fluid flow being direct ed from t he electromagnetic 3-way
pilot.
maintain a defined safe state for the equipment / machinery / plant
apparatus under control of the
against risk of damage to persons by electrical shock and other
and against resulting fire and explosion. The protection must be
under a ll conditions of the nominal operation and under single
condition
safety achieved b y safety-related
the pilot in the closed
demand from the
unable to go to the defined fail-safe
automatic stroke
effect on the safety
related syst em is no great er t han twic e the proof test
performing any work activities in compliance with government
authorities
Average Probability of Failure on
.
de-energized.
position.
process.
testing.
function.
Tolerance
harm
system
systems
Demand
state).
Analysis
valve.
frequency.
valve.
Safety
process.
whose
media
the
solenoid
protects
hazards
effective
fault
the
holds
being
by
testing.
no
safety-
when
regulatory
a
a
to
/
a
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I&M No
V 9629 R6
All Rights Reserved
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