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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MOC: A31D to 8580 & 8532 High-Performance Buttery Valves
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: Yes.
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POSI-SEAL A31D and 8580 & 8532 Valve Comparison
The following sections are intended to provide a nominal comparison between the
Fisher POSI-SEAL A31D valve and the Fisher 8580 & 8532 valves.
Scope, Size, and Class
Sizes NPS 3 – 24 CL150 and 300 of the A31D valve will be made obsolete and replaced with the
8580 and 8532 valves in equivalent size and class. The 8580 valve covers NPS 3 – 12 and the
8532 valve covers NPS 14 – 24.
Capacity (Cv)
The ow capacity of the A31D valve is not equivalent to the 8580 valve. However, the A31D
and 8532 have identical ow coefcients. Please see Catalog 12 Section 1.
Actuator Sizing (Torque)
The actuator sizing for the A31D valve and 8532 valve is the same. The sizing coefcients,
breakout torque, and dynamic torque are also the same.
The actuator sizing for the A31D and 8580 are different. Please see Catalog 14 Sections C & D.
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MOC: A31D to 8580 & 8532 High-Performance Buttery Valves
Face-to-Face Dimensions
The 8580 & 8532 valves have the same face-face as the A31D valve.
Actuator Mounting Dimensions
The NPS 3 - 12 A31D has slightly different mounting dimensions than the 8580
The NPS 14 – 24 A31D has the same mounting dimensions as the 8532.
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Figure 1. Fisher POSI-SEAL A31D
Figure 2. Fisher 8580 Double Flanged Style
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NPS 3
NPS 4
NPS 6
NPS 8
NPS 10
NPS 12
Valve Size
MOC: A31D to 8580 & 8532 High-Performance Buttery Valves
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CL150, Double-Flanged
M T N U P W
A31D 8580 A31D 8580 A31D 8580
mm 117 117 - - 14.2 14
inch 4.62 4.62 - - 0.56 0.55
mm 117 152 - 32 14.2 14
inch 4.62 6 - 1.25 0.56 0.55
mm 152 152 31.8 32 14.2 14
inch 6.00 6 1.25 1.25 0.56 0.55
mm 152 235 31.8 46 14.2 18
inch 6.00 9.25 1.25 1.81 0.56 0.71
mm 235 235 46.0 46 17.5 18
inch 9.25 9.25 1.81 1.81 1.81 0.71
mm 235 235 46.0 46 17.5 18
inch 9.25 9.25 1.81 1.81 1.81 0.71
NPS 3
NPS 4
NPS 6
NPS 8
NPS 10
NPS 12
Valve Size
CL300, Double-Flanged
M T N U P W
A31D 8580 A31D 8580 A31D 8580
mm 117 117 - - 14.2 14
inch 4.62 4.62 - - 0.56 0.55
mm 117 152 - 32 14.2 14
inch 4.62 6 - 1.25 0.56 0.55
mm 152 152 31.8 32 14.2 14
inch 6.00 6 1.25 1.25 0.56 0.55
mm 235 235 46.0 46 17.5 18
inch 9.25 9.25 1.81 1.81 0.69 0.71
mm 235 235 46.0 46 17.5 18
inch 9.25 9.25 1.81 1.81 0.69 0.71
mm 273 235 50.8 46 20.6 18
inch 10.75 9.25 2.00 1.81 0.81 0.71
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MOC: A31D to 8580 & 8532 High-Performance Buttery Valves
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Shaft Size
The NPS 14 – 24 A31D has the same shaft size dimensions as the 8532. The 8580
valve uses the Fisher style F mounting pattern and a spline shaft, as standard, which
will mount easily to Fisher actuators. Square is a shaft option that is available for
mounting ISO 5211 actuators. The 8580 valve does not have a keyed shaft option
as the A31D did.
CL150, Double-Flanged
Valve
Size
mm inch mm inch mm inch mm inch mm inch mm inch
NPS 3 14.3 0.56 15.9 0.63 - - 11 0.43 14.3 0.56 - -
NPS 4 15.9 0.63 19.1 0.75 - - 14 0.55 17.5 0.69 - -
NPS 6 22.2 0.88 25.4 1.00 - - 19 0.75 23.8 0.94 - -
NPS 8 22.2 0.88 31.8 1.25 - - 22 0.87 23.8 0.94 - -
NPS 10 28.4 1.13 31.8 1.25 - - 22 0.87 28.6 1.13 - -
NPS 12 31.8 1.25 38.1 1.50 - - 27 1.06 31.8 1.25 - -
Spline Diameter Square Size Keyed Diameter
A31D 8580 A31D 8580 A31D 8580
CL300, Double-Flanged
Valve
Size
Spline Diameter Square Size Keyed Diameter
A31D 8580 A31D 8580 A31D 8580
mm inch mm inch mm inch mm inch mm inch mm inch
NPS 3 14.3 0.56 15.9 0.63 - - 11 0.43 14.3 0.56 - -
NPS 4 15.9 0.63 19.1 0.75 - - 14 0.55 17.5 0.69 - -
NPS 6 22.2 0.88 25.4 1.00 - - 19 0.75 23.8 0.94 - -
NPS 8 31.8 1.25 31.8 1.25 - - 22 0.87 31.8 1.25 - -
NPS 10 38.1 1.50 31.8 1.25 - - 22 0.87 41.3 1.63 - -
NPS 12 44.5 1.75 38.1 1.50 - - 27 1.06 47.6 1.88 - -
Table 3. Shaft Size
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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)
MOC: A1D to 8580 & 8532 High-Performance Buttery Valves
Spare Parts
The A31D valve and 8532 valve use all the same trim parts, including seals, gaskets,
and bearings. The 8532 valve is available with both standard and ENVIRO-SEAL
packing.
The packing parts of the 8580 and A31D valves are not interchangeable. They do
not share the same spare parts.
Conclusion
Emerson now offers the Fisher 8580 and 8532 valves with the Double Flanged
body style option as a replacement for the obsolete Fisher POSI-SEAL A31D valve.
With this change, Emerson offers a simplied line of Fisher buttery valves, while
maintaining full application coverage.
Please contact your local Emerson business partner or sales ofce for additional
details or questions regarding the Fisher 8580 and 8532 valves.
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contact in your area.
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