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
D352341X012
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
September 2018
D352341X012
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
September 2018
D352341X012
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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