Management of Change Guide: Replacement of Fisher POSI-SEAL A31A Valve with Fisher 8532 High-Performance Butterfly Valve
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Loading...Fisher Management of Change Guide: Replacement of Fisher POSI-SEAL A31A Valve with Fisher 8532 High-Performance Butterfly Valve Manuals & Guides
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Management of Change Guide
Replacement of Fisher™ POSI-SEAL™ A31A
Valve with Fisher 8532 High-Performance
Buttery Valve
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
September 2018
D352491X012
POSI-SEAL A31A and 8532 Valve Comparison ..4
Scope, Size, Class ................................................................ 4
Capacities (Cv) .................................................................... 4
Actuator Sizing (Torque) ..................................................... 4
Dimensions ........................................................................ 4
Body Style .......................................................................... 5
Spare Parts ......................................................................... 5
Conclusion ......................................................5
Additional Resources ......................................5
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Management of Change
Management of Change (MOC) is a procedure used to proactively manage changes
that have the potential to impact safety or the process within a plant. Evaluating
new techniques for improving MOC approval procedures can have an impact on
plant efciency. Historically, upgrading obsolete products or replacing existing
process control equipment had been delayed or abandoned due to the extensive
paperwork involved in completing a complex MOC approval sheet.
Background
The Fisher POSI-SEAL A31A rotary valve is a high-performance buttery valve
(HPBV) for use in automated on/off, quarter-turn applications. The A31A valve is
congured with a keyed drive shaft for use with various styles of valve actuators.
Fisher POSI-SEAL A31A valves will be made obsolete, effective October 2016, and
will transition to the Fisher 8532 rotary valve.
The A31A valve is very similar to the 8532 valve, as they were developed at the
same time. The 8532 valve is typically congured with a spline shaft and paired with
Fisher 2052 or 1061 actuators for excellent throttling performance. However, the
8532 valve is now available with shaft style and actuator mounting options; this
makes it possible to congure an 8532 valve just like an A31A valve. The 8532 valve
congured with keyed shafts will perform and install the same as the A31A valve,
and it may be used in the same applications.
MOC: POSI-SEAL A31A to 8532 Valve
September 2018
D352491X012
For more information regarding Fisher valves, contact your local Emerson sales ofce.
Question & Answer Checklist
Q: Does the proposed modication cause any changes to the piping and
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instrumentation diagram (P&ID)?
A: No.
Q: Does the proposed modication change process chemistry,
technology, or operating and control philosophies?
A: No.
Q: Does the proposed modication change how the existing plant is
operated?
A: No.
Q: Does the proposed modication change process ows?
A: No.
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Q: Does the proposed modication change existing pressure relief cases?
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A: No.
Q: Does the proposed modication change the process description?
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A: No.
Q: Have the codes and standards to which the new equipment was
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designed changed?
A: No. However, they may have been updated since installation.
Q: Does the proposed modication change the materials of construction,
such as a change in material form (cast, forged, or alloy)?
A: No.
MOC: POSI-SEAL A31A to 8532 Valve
September 2018
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Q: Does the proposed modication introduce new equipment items that
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require periodic predictive maintenance?
A: No. These equipment items will require the same periodic predictive
maintenance.
Q: Does the proposed modication change existing operator training
requirements?
A: No.
Q: Does the proposed modication introduce new equipment items
that require spare parts, training manuals, maintenance procedures
or training to teach the maintenance department how to maintain
them?
A: No.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: No.
Q: Does the proposed modication permanently remove the spares for
existing pieces of equipment?
A: No.
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Q: Does the proposed modication change the inspection scope or
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inspection interval?
A: No.
Q: Does the proposed modication require welding work to be
performed?
A: No.
Q: Have the materials of construction been reviewed to ensure that the
metallurgy is correct?
A: No.
POSI-SEAL A31A and 8532 Valve
MOC: POSI-SEAL A31A to 8532 Valve
September 2018
D352491X012
Comparison
The following sections are intended to provide a nominal comparison between the
Fisher POSI-SEAL A31A valve and the Fisher 8532 valve.
Scope, Size, Class
The A31A valve was available in NPS 14 through NPS 24, CL150 to 300. All sizes of
A31A valve will be made obsolete and replaced with the 8532 valve in equivalent
size and class.
Capacities (Cv)
The ow capacity of the 8532 valve is the same as the A31A valve.
Actuator Sizing (Torque)
The actuator sizing for the 8532 valve is the same as the A31A valve. The sizing
coefcients, breakout torque, and dynamic torque are also the same.
Dimensions
The 8532 valve has the same dimensions as the A31A valve when the keyed shaft
style option is used; this includes actuator mounting dimensions.
Body Style
The A31A and 8532 valves were previously available in both wafer (angeless) and
lugged (single-ange) valve body styles. The lugged body style of the 8532 valve is
now standard. Lugged valve bodies can be direct replacements of wafer body valves
as the face-to-face dimensions are the same. A drilled-through ange hole option
is available for users who prefer the ange bolting style, typically used with wafer
bodies. Effective October 2016, the wafer (angeless) style valve bodies will no
longer be available.
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on dark backgroundson light backgrounds
standard
no gradients
watermark
stacked logo (for sharing only)
standard
no gradients
watermark
stacked logo (for sharing only)
Spare Parts
The A31A valve and 8532 valve use identical trim parts, including seals, gaskets,
bearings, and packing. Any spare parts for the A31A valve may be used for the
8532 valve.
Conclusion
Emerson offers the Fisher 8532 valve with an optional keyed drive shaft
conguration as a replacement for the obsolete Fisher POSI-SEAL A31A valve.
With this change, Emerson offers a simplied line of Fisher buttery valves, while
maintaining full application coverage.
Additional Resources
8532 Instruction Manual
8532 Product Bulletin
8532 Product Webpage
MOC: POSI-SEAL A31A to 8532 Valve
September 2018
D352491X012
Visit Fisher.com to
nd an Emerson sales
contact in your area.
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