Management of Change Guide: Replacement of Fisher™ POSI-SEAL™ A31D Valve with Fisher 8580 & 8532 High-Performance Butterfly Valves
Fisher Management of Change Guide: Replacement of Fisher™ POSI-SEAL™ A31D Valve with Fisher 8580 & 8532 High-Performance Butterfly Valves Manuals & Guides
Management of Change Guide
Replacement of Fisher™ POSI-SEAL™ A31D
Valve with Fisher 8580 & 8532
High-Performance Buttery Valves
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
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Comparison of POSI-SEAL A31D to 8580 & 8532
Valve ..............................................................4
Scope, Size, and Class ......................................................... 4
Capacity ............................................................................. 4
Actuator Sizing .................................................................... 4
Face-to-Face Dimensions .................................................... 5
Actuator Mounting Dimensions .......................................... 5
Shaft Size ............................................................................ 7
Conclusion ......................................................8
X1429
Fisher 8580 Valve Double Flanged Style
MOC: A31D to 8580 & 8532 High-Performance Buttery Valves
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 8580 and 8532 valves are now available in the double anged body style.
These congurations of 8580 and 8532 valves can fully replace the Fisher POSI-SEAL
A31D valve NPS 3 – 24 CL150 and 300. The soft seal option for the A31D will be
made obsolete, leaving the NOVEX and Phoenix III seals still available. The 8580
valve covers sizes NPS 3 – 12 and the 8532 valve covers sizes 14 – 24. This is part
of a continuing effort to consolidate the Fisher High-Performance Buttery Valve
(HPBV) product offering.
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The Fisher 8580 Double Flanged valve is a new product that is an extension of the
8580 valve with all the same features and options. It does not have the same Cv,
mounting, spare parts, etc. The Fisher 8532 is identical to the NPS 14 – 24 A31D
valve.
Question & Answer Checklist
Q: Does the proposed modication cause any changes to the piping and
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instrumentation diagram (P&ID)?
A: Maybe. Actuator size & type could change.
Q: Does the proposed modication change process chemistry,
technology, or operating and control philosophies?
A: Maybe. Could change the actuator type and/or size.
Q: Does the proposed modication change how the existing plant is
operated?
A: Maybe. Actuation changes could affect plant operation.
Q: Does the proposed modication change process ows?
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A: Yes. CVs change for 8580. Please see Catalog 12 Section 1.
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MOC: A31D to 8580 & 8532 High-Performance Buttery Valves
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.
Q: Does the proposed modication change the materials of construction,
such as a change in material form (cast, forged, or alloy)?
A: Yes. Standard materials are different for 8580. See the product
bulletin.
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Q: Does the proposed modication introduce new equipment items that
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require periodic predictive maintenance?
A: No. The new equipment items will require the same periodic
maintenance as required by the previous equipment items.
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: Yes. 8580 is different than the 8532/A31D. See the instruction
manual.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: Yes. Spare parts will be different for the 8580.
Q: Does the proposed modication permanently remove the spares for
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existing pieces of equipment?
A: Yes. Spare parts will be different for the 8580.
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