Management of Change Guide
Replacement of Fisher™ A11 High-
Performance Buttery Valves with Fisher
8590 High-Performance Buttery Valves
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
September 2018
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Comparison of the Fisher A11 to 8590 Valve ...4
Scope, Size, and Class ......................................................... 4
Capacity ............................................................................. 4
Face-to-Face Dimensions .................................................... 4
Actuator Mounting Dimensions .......................................... 5
Shaft Size ............................................................................ 6
Material Availability ............................................................ 7
Conclusion ......................................................7
Additional Resources ......................................8
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
Emerson introduces the Fisher 8590 high-performance buttery valve. It is a
redesign of the NPS 3 to 24 Class 600 Fisher A11 high-performance buttery valve.
The A11 valve has been used across multiple industries and applications for many
years. The 8590 valve will continue to serve those same applications.
MOC: A11 to 8590 Buttery Valves
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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: Maybe. Review capacity information to ensure no issues will take place.
Q: Does the proposed modication change process ows?
A: Maybe. Review capacity information to ensure no issues will take place.
Q: Does the proposed modication change existing pressure relief cases?
A: No.
Q: Does the proposed modication change the process description?
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A: No.
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Q: Have the codes and standards to which the new equipment was
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designed changed?
A: The 8590 valve is still designed in accordance with ASME-B16.34. It
now meets additional industry standards, such as the face-to-face
lengths per API 609.
Q: Does the proposed modication change the materials of construction,
such as a change in material form (cast, forged, or alloy)?
A: No.
Q: Does the proposed modication introduce new equipment items that
require periodic predictive maintenance?
A: No. The new equipment items will require the same periodic
maintenance as required by the previous equipment items.
MOC: A11 to 8590 Buttery Valves
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Q: Does the proposed modication change existing operator training
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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. The new equipment requires 8590 valve instruction manuals,
maintenance procedures, and training for the maintenance
department. However, if your staff have been trained or are familiar
with the A11, 8580, and A81 valves, they won’t require more training.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: Yes. New spares will be required for the 8590 valve, which are not
compatible with the A11 valve. Spare trim parts will continue to be
available for the A11 valve until the end of 2025.
Q: Does the proposed modication permanently remove the spares for
existing pieces of equipment?
A: Spare parts for existing A11 valve will remain unchanged. The 8590
valve will require different spare parts.
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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: Yes. The 8590 valve is available in the same materials of construction
as the A11 valve.
Comparison of the Fisher A11 to 8590 Valve
The 8590 valve is less complex, easier to select, use, and maintain than the A11
valve it replaces. However, some items need to be considered when replacing an
A11 valve with an 8590 valve..
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Scope, Size, and Class
Only the NPS 3 through 24 Class 600 A11 valves will be replaced by the 8590 valve.
The large (NPS 30 and higher) and high-pressure (Class 900 and Class 1500) A11
valves will remain.
The 8590 valve will only be available with a lugged (single ange) valve body. In
cases where a wafer (angeless) valve body is preferred, an option is available for
drilled-through ange holes that will install between pipe anges with the same
bolting as a wafer-style body.
Capacity
Some minor geometry changes, as well as increased analysis and testing
capabilities, cause the 8590 valve to have different ow coefcients than the A11
valve. Please refer to the 8590 valve product literature for the 8590 valve ow
coefcients.
Face-to-Face Dimensions
Some sizes of the A11 valve did not conform to industry standards for face-to-face
length. All sizes of the 8590 valve meet the API 609 face-to-face dimensions for
lugged category B valves. See Table 1 for the dimensions of the two valve types. In
most sizes, the face-to-face difference is less than 0.10 inch (2.5mm) and an option
is available to provide the 8590 valve with the A11 face-to-face length for three
sizes highlighted in the below table which have changed more.
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MOC: A11 to 8590 Buttery Valves
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Valve
Typ e
NPS 3 NPS 4 NPS 6 NPS 8 NPS 10 NPS 12
mm inch mm inch mm inch mm inch mm inch mm inch
A11 46 1.81 60 2.38 73 2.88 89 3.50 114 4.50 140 5.50
8590 52 2.04 62 2.44 76 2.98 102 4.00 116 4.56 140 5.50
Valve
Typ e
NPS 12 NPS 14 NPS 16 NPS 18 NPS 20 NPS 24
mm inch mm inch mm inch mm inch mm inch mm inch
A11 140 5.50 159 6.25 178 7.00 197 7.75 229 9.00 229 9.00
8590 140 5.50 157 6.18 178 7.00 198 7.81 216 8.50 230 9.06
Table 1. Face-to-Face Dimensions
Actuator Mounting Dimensions
The NPS 3 to 6 A11 valves use a circular actuator mounting bolt pattern and the
NPS 8 to 24 A11 valves use a rectangular actuator mounting bolt pattern. These
bolt patterns require special brackets, yokes, or adapter pieces to mount Fisher
actuators. The 8590 valve uses the Fisher style F mounting pattern and a spline
shaft, as standard, which will mount easily to Fisher actuators. Square (NPS 3 to
12) and keyed (NPS 14 to 24) shaft options are available for mounting ISO 5211
actuators.
Figure 1. Fisher A11 Valve
Figure 2. Fisher 8590 Valve
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MOC: A11 to 8590 Buttery Valves
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Valve Size
NPS 3
NPS 4
NPS 6
NPS 8
NPS 10
NPS 12
NPS 14
NPS 16
NPS 18
NPS 20
NPS 24
H K L
A11 8590 A11 8590 A11 8590
mm 89 117 -- -- 14
inch 3.50 4.62 -- -- 0.53
mm 114 152 -- 32 14
inch 4.50 6.00 -- 1.25 0.53
mm 114 235 -- 46 14
inch 4.50 9.25 -- 1.81 0.53
mm 127 235 51 46
inch 5.00 9.25 2.00 1.81
mm 127 273 51 51
inch 5.00 10.75 2.00 2.00
mm 273 273 51 51
inch 10.75 10.75 2.00 2.00
mm 337 337 76 76
inch 13.25 13.25 2.00 3.00
mm 337 337 76 76
inch 13.25 13.25 2.00 3.00
mm 305 533 152 127
inch 12.00 21.00 3.00 5.00
mm 305 533 152 127
inch 12.00 21.00 3.00 5.00
mm 508 533 203 127
inch 20.00 21.00 8.00 5.00
1/2-13 5/8-11
3/4-10 3/4-10
3/4-10 3/4-10
7/8-9 7/8-9
7/8-9 7/8-9
1 1/4-7 1 1/4-8
1 1/4-7 1 1/4-8
1 1/4-7 1 1/4-8
1/2-13
1/2-13
5/8-11
Table 2. Actuator Mounting Dimensions
Shaft Size
The 8590 valve will have a spline shaft, as standard. Some shaft diameters have
changed. Also, some square and spline sizes have changed.
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MOC: A11 to 8590 Buttery Valves
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Valve
Size
NPS 3 16 5/8 16 5/8 10.3 13/32 11 0.43 25 1 -- --
NPS 4 19 3/4 19 3/4 15.9 5/8 14 0.55 38 1.5 -- --
NPS 6 32 1 1/4 32 1 1/4 22.2 7/8 22 0.87 44 1.75 -- --
NPS 8 38 1 1/2 38 1 1/2 25.4 1 27 1.06 57 2.25 -- --
NPS 10 44 1 3/4 44 1 3/4 34.9 1 3/8 36 1.42 57 2.25 -- --
NPS 12 44 1 3/4 51 2 34.9 1 3/8 36 1.42 70 2.75 -- --
NPS 14 51 2 64 2 1/2 -- -- -- -- 57 2.75 57 2.25
NPS 16 64 2 1/2 64 2 1/2 -- -- -- -- 70 2.75 70 2.75
NPS 18 -- -- 76 3 -- -- -- -- 70 2.75 70 2.75
NPS 20 -- -- 76 3 -- -- -- -- 70 2.75 70 2.75
NPS 24 -- -- 76 3 -- -- -- -- 70 2.75 70 2.75
Table 3. Shaft Size
Spline Diameter Square Size Keyed Diameter
A11 8590 A11 8590 A11 8590
mm in mm in mm in mm in mm in mm in
Material Availability
Generally, material availability is unchanged. Standard valve body materials remain
WCC and CF8M with additional alloys available.
Conclusion
The Fisher 8590 valve is part of the 8500 series of Fisher high-performance
buttery valves. The 8590 valve retains and adds to the capabilities of the Fisher
A11 valve, while incorporating the features of current Fisher products, making it a
straightforward replacement of legacy products.
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Additional Resources
8590 Product Bulletin (D104017X012)
8590 Instruction Manual (D104016X012)
MOC: A11 to 8590 Buttery Valves
September 2018
D352341X012
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