Asco 8316 Series User manual

I&M V 9629 R9
Solenoid Valves used in Safety
Instrumented Systems
Operating Manual in accordance with IEC 61508
©ASCO, L.P. 160 Park Avenue, Florham Park, New Jersey 07932 www.asco.com E288862-10/15/2018 All Rights Reserved 
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Table of Contents
1 Introduction ........................................................................................................................3
1.1 Terms and Abbreviations
.............................................................................................3
1.2 Acronyms
.....................................................................................................................3
2 Designing a Safety Instrumented Function using an ASCO Solenoid Valve..................
4
2.1 Safety Function
............................................................................................................4
2.2 Environmental limits
.....................................................................................................4
2.3 Application limits
..........................................................................................................4
2.4 Design Verification
.......................................................................................................4
2.5 SIL Capability
...............................................................................................................5
2.5.1 Systematic Integrity
..........................................................................................5
2.5.2 Random Integrity
..............................................................................................5
3 Installation and Commissioning
.......................................................................................5
3.1 Installation
....................................................................................................................5
3.2 Response
Time ............................................................................................................6
4 Operation and Maintenance
..............................................................................................6
4.1 Proof test without automatic
testing..............................................................................6
4.2 Proof test with automatic partial valve stroke testing .....................................................
6
4.2.1 Testing of the Product................................................................................................6
4.2.2 Physical Inspection
...........................................................................................6
4.3 Repair and replacement
...............................................................................................7
4.4 ASCO Notification
........................................................................................................7
5 ASCO Solenoid Pilot Valves
Covered...............................................................................7
6 Status of the document
.....................................................................................................7
6.1 Releases
......................................................................................................................7

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1 Introduction
This Operating Manual provides the necessary information to design, install, verify and maintain a Safety
Instrumented Function (SIF) utilizing an ASCO Solenoid Valve. This manual provides necessary requirements
for meeting the IEC 61508 or IEC 61511 functional safety standards.
1.1 Terms and Abbreviations
• Process Valve Any valve that is used to control the flow of media being used in a process.
For the purpose of this document, this is usually a 2-way valve
whose
movement is being controlled by an actuator and pilot valve.
• Pilot Valve A 3-way or 4-way valve that is used to send or remove pressurized media
to and from an actuator for the opening and closing of a process valve.
• Direct Acting Refers to a solenoid valves main orifice that is opened and closed as a
direct result of the solenoid valves electromagnetic movement when the
coil is energized and de-energized.
• Indirect Acting Refers to a solenoid valve’s main orifice that is opened and closed as a
result of fluid flow being directed from the electromagnetic 3-way solenoid
pilot.
• Safety Freedom from unacceptable risk of harm
• Functional Safety The ability of a system to carry out the actions necessary to achieve or to
maintain a defined safe state for the equipment / machinery / plant /
apparatus under control of the system
• Basic Safety The equipment must be designed and manufactured such that it protects
against risk of damage to persons by electrical shock and other hazards
and against resulting fire and explosion. The protection must be effective
under all conditions of the nominal operation and under single fault
condition
• Safety Assessment The investigation to arrive at a judgment - based on evidence - of the
safety achieved by safety-related systems
• Fail-Safe State The state where the solenoid is de-energized and its return spring holds
the pilot in the closed position.
• Fail Safe Failure that causes the valve to go to the defined fail-safe state without a
demand from the process.
• Fail Dangerous Failure that does not respond to a demand from the process (i.e. being
unable to go to the defined fail-safe state).
• Fail Dangerous Undetected (DU) Failure that is dangerous and that is not being diagnosed by
automatic stroke testing.
• Fail Dangerous Detected (DD) Failure that is dangerous but is detected by automatic stroke testing.
• Fail No Effect Failure of a component that is part of the safety function but that has no
effect on the safety function .
• Low Demand Mode Mode, where the frequency of demands for operation made on a safety-
related system is no greater than twice the proof test frequency.
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

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• 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).
2 Designing a Safety Instrumented Function (SIF) using an ASCO
Solenoid Valve
2.1 Safety Function
When de-energized, the ASCO Solenoid Pilot Valve moves to its fail-safe position. Depending on the solenoid
specified Normally Closed (NC) or Normally Open (NO), the valve will supply the fluid media or vent the fluid
media depending on the piping of the installation. Please note that the solenoid pilot valve must be piped to
the actuator in accordance with the manufacturer’s recommendations and allowable desired function.
The valve is intended to be part of final element subsystem as defined per IEC 61508 and the achieved SIL
level of the designed function must be verified by the
designer.
2.2 Environmental limits
The environmental limits of each solenoid are specified in the products respective catalog and Installation &
Maintenance Instructions. The designer of a SIF must check that the product is rated for use within the
expected environmental limits.
2.3 Application limits
The application limits of an ASCO Solenoid are specified in the products respective catalog and Installation &
Maintenance Instructions. It is especially important that the designer check for material compatibility
considering on-site chemical contaminants and air supply conditions. If the solenoid valve is used outside of
the application limits or with incompatible materials, the reliability data provided becomes invalid.
2.4 Design Verification
• A detailed Failure Mode, Effects, and Diagnostics Analysis (FMEDA) report is available from ASCO .
This report details all failure rates and failure modes as well as the expected
lifetime.
• The achieved Safety Integrity Level (SIL) of an entire Safety Instrumented Function (SIF) design must
be verified by the designer via a calculation of PFDavg considering redundant architectures, proof test
interval, proof test effectiveness, any automatic diagnostics, average repair time and the specific
failure rates of all products included in the SIF. Each subsystem must be checked to assure
compliance with minimum hardware fault tolerance (HFT) requirements. The Exida exSILentia tool is
recommended for this work.
• When using an ASCO Solenoid in a redundant configuration, a common cause factor of 5% should be
included in safety integrity calculations.
• The failure rate data listed the FMEDA report is only valid for the useful life time of an ASCO Solenoid.
The failure rates will increase sometime after this time period. Reliability calculations based on
the
data listed in the FMEDA report for mission times beyond the lifetime may yield results that are too
optimistic, i.e. the calculated Safety Integrity Level will not be achieved.

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2.5 SIL Capability
2.5.1 Systematic Integrity
The product has met manufacturer design process requirements of Safety Integrity Level (SIL) 3. These are
intended to achieve sufficient integrity against systematic errors of design by the manufacturer. A Safety
Instrumented Function (SIF) designed with this product must not be used at a SIL level higher than the
statement without “prior use” justification by end user or diverse technology redundancy in the design.
2.5.2 Random Integrity
The solenoid valve is a Type A Device. Therefore when used the only component in a final element
subassembly, a design can meet SIL 3 @ HFT=1 and SIL 2 @ HFT=0.
When the final element assembly consists of many components (solenoid valve, quick exhaust valve,
actuator,
isolation valve, etc.) the SIL must be verified for the entire assembly using failure rates from all components.
This analysis must account for any hardware fault tolerance and architecture constraints.
3 Installation and Commissioning
3.1 Installation
• The ASCO Solenoid valve must be installed per standard installation practices outlined in the
Installation
Manual.
• The environment must be checked to verify that environmental conditions do not exceed the ratings.
• The ASCO Solenoid must be accessible for physical inspection.
• Instrument Air Filtration: These solenoids are intended for use on clean, dry air or inert gas filtered to
50 microns or better. To prevent freezing, the dew point of the media should be at least
18 ° F (10 ° C)
below the minimum temperature to which any portion of the clean air or gas system could be exposed.
Instrument air in compliance with ANSI/ISA Standard S7.3-1975 (R1981) exceeds the above
requirements and is, therefore, an acceptable medium for these valves.
• It is the operator’s responsibility to only use design options such as latches, when it is safe to do so.
• Typical 3-way pilot valve piping configurations:
a. 1 out-of 1 – This is the most common pilot valve configuration
used.
b. 2 out-of 2 – This is commonly used for high availability applications. In the case that one
solenoid valve was to spuriously trip, the second solenoid still maintains the position of the
actuator/process valve at its operating state. Both solenoids must close in order to shift the
actuator/process valve to its non-operating state.

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3.2 Response Time
The response time of a solenoid pilot valve will vary by design. The factors that affect response time are pilot
valve orifice size, operating pressure, size of actuator, torque required to open and close process valve, and
distance between pilot valve and actuator. It is the responsibility of the end user to use a pilot valve that
delivers the correct opening and closing time of the process valve required for the application.
4 Operation and Maintenance
4.1 Proof test without automatic testing
The objective of proof testing is to detect failures within an ASCO Solenoid that are not detected by any
automatic diagnostics of the system. Of main concern are undetected failures that prevent the safety
instrumented function from performing its intended function.
The frequency of proof testing, or the proof test interval, is to be determined in reliability calculations for the
safety instrumented functions for which an ASCO Solenoid is applied. The proof tests must be performed more
frequently than or as frequently as specified in the calculation in order to maintain the required safety integrity
of the safety instrumented function.
The following proof test is recommended. Any failures that are detected and that compromise functional safety
should be reported to ASCO .
Table 1
Step Action
1 Bypass the safety PLC or take other appropriate action to avoid a false trip, following company
Management of Change (MOC)
procedures
2
Inspect the external parts of the solenoid valve for dirty or clogged ports and other physical
damage. Do not attempt disassembly of the valve.
3 De-energize the solenoid coil and observe that the actuator and valve move. Energize the
solenoid after a small movement of the valve.
4
Inspect the solenoid for dirt, corrosion or excessive moisture. Clean if necessary and take
corrective action to properly clean the air supply. This is done to avoid incipient failures due to
dirty air.
5
Record any failures in your company’s SIF inspection database. Restore the loop
to full
operation.
6 Remove the bypass from the safety PLC or otherwise restore normal operation
This test will detect approximately 99% of possible DU failures in the solenoid (Proof Test Coverage).
The person(s) performing the proof test of an ASCO Solenoid should be trained in SIS operations, including
bypass procedures, solenoid maintenance and company Management of Change procedures. No special tools
are required.
4.2 Proof test with automatic partial valve stroke testing
4.2.1 Testing of the Product
An automatic partial valve stroke testing scheme that performs a full stroke of the solenoid valve and
measures valve movement timing will detect most potentially dangerous failure modes.
4.2.2 Physical Inspection
It is recommended that a physical inspection (Step 2 from Table 1) be performed on a periodic basis with
the time
interval determined by plant conditions. Maximum inspection interval is five years but an annual
inspection
is recommended.

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4.3 Repair and replacement
According to section 7.4.7.4 of IEC 61508-2 a useful lifetime based on experience, should be assumed.
General field knowledge suggests that most solenoid valves have a useful life of 3 to 10 years, but may be
longer depending on the valve series and other factors.
It is
the responsibility of the end user to establish a preventative maintenance process to replace all solenoids
before the end of the useful life.
4.4 ASCO Notification
Any failures that are detected and that compromise functional safety should be reported to ASCO Valve.
Please contact ASCO customer service.
5 ASCO Solenoid Pilot Valves Covered
Select ASCO valves from the following series have been evaluated per IEC 61508 parts 1 and 2 and covered
under this document:
8314 Series - 3-Way Direct Acting Pilot
Valves
8320 Series - 3-Way Direct Acting Pilot
Valves
8316 Series - 3-Way Indirect Acting Pilot
Valves
551, 552, 553 Series - 3 and 4-Way Indirect Acting Pilot
Valves
8317, 8320, 8321 Series - 3-Way Harsh Environment Pilot
Valves
 327/8327 Series - 3-Way Direct Acting Pilot Valves.
 126 Series - 3-Way Direct Acting Pilot Valves.
 8317 Series – 3-Way Piloting Quick Exhaust valve
 307 Series - 3-Way Direct Acting Pilot Valves
 364 Series – 3-Way Spool Valves

362/562 Series – 3-Way and 4-Way Spool Valves

381 Series – 3-Way Poppet Valves

8800 Series – 3-Way High Flow Quick Exhaust Valves
6 Status of the document
6.1 Releases
Revision: K
ECN Number: 288862
Release status: V9629 Initial Release on
02/18/11