Management of Change Guide: Replacing Fisher CE Valves with Fisher GX Valves
Table of contents
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Management of Change Guide
September 2018 / D352220X012
Replacement of Fisher™ CE Valves with
Fisher GX Control Valves
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
Fisher CE and GX Control Valve Comparison ....4
Capabilities by Size ............................................................. 4
Alloy Material Comparison .................................................. 9
ISA Long Face-to-Face Dimension ....................................... 9
Bellows Comparison ......................................................... 10
Valve and Actuator Features .............................................. 10
Conclusion .....................................................11
Additional Resources .....................................12
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 CE valve was developed to meet the specic requirements of the
chemical industry and was the primary offering for the industrial process
application segment of the chemical industry until 1996. The CE was a globe-style,
single-port valve with stem guiding, quick-change trim, separable anges, and
clamped-in seat ring. The CE valve is an obsolete product and the 10-year guarantee
of recommended spare parts availability for obsolete products ended in 2006.
MOC: CE to GX Valves
September 2018 / D352220X012
The Fisher GX is a compact, multi-spring actuator and globe valve system that
can meet the requirements of the chemical market. The GX valve is rugged,
reliable, and easy to select. It requires no actuator sizing—the actuator selection is
automatic once the valve body construction and available plant air supply pressure
are selected. A key feature of the GX valve is the ability to integrally mount the
FIELDVUE™ DVC2000 or DVC6200 digital valve controller for linkage-less position
feedback. With a global installed base of nearly 100,000 units, the GX is a proven
and reliable control valve solution for a wide array of applications across a broad
range of industries.
Contained in the following sections are design comparisons between the current
Fisher GX control valve and obsolete Fisher CE, Class 150 and Class 300 control
valves. These comparisons are intended to help end users complete MOC approval
documents to understand the similarities and differences between GX and CE valves
to effectively transition to the GX 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: No.
Q: Does the proposed modication change process chemistry,
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technology, or operating and control philosophies?
A: No.
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Q: Does the proposed modication change how the existing plant is
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operated?
A: Possibly. Review capacity information to ensure no issues will take
place.
Q: Does the proposed modication change process ows?
A: Possibly. Review capacity information to ensure no issues will take
place.
Q: Does the proposed modication change existing pressure relief cases?
A: Possibly. If the GX replacement selection exceeds the maximum rated
Cv of the existing CE valve, then pressure relief cases will require
review. Pressure relief valve sizing is not considered when sizing and
selecting Fisher control valves for end user applications. If the control
valve is determined to affect upstream or downstream safety relief
cases, review by the end user or third party is recommended.
MOC: CE to GX Valves
September 2018 / D352220X012
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: No.
Q: Does the proposed modication introduce new equipment items that
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.
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Q: Does the proposed modication introduce new equipment items
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that require spare parts, training manuals, maintenance procedures
or training to teach the maintenance department how to maintain
them?
A: Yes. Emerson sales ofces offer local training and support to help
ensure operators, maintenance personnel, and instrument technicians
are fully trained on the Fisher GX control valve.
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 Fisher GX valve, which are not
compatible with the CE valve.
Q: Does the proposed modication permanently remove the spares for
existing pieces of equipment?
A: Yes. The spare parts of the existing equipment items should be
removed from the plant.
MOC: CE to GX Valves
September 2018 / D352220X012
Q: Does the proposed modication change the inspection scope or
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inspection interval?
A: No.
Fisher CE and GX Control Valve Comparison
The Fisher GX valve is capable of being used in a broad range of industries and
applications. It has been designed as the primary replacement for the CE valve.
The tables and sections that follow describe the similarities and differences
between these two products.
Capabilities by Size
Due to differences in ow geometry and small variations in sizing coefcients, each
valve should be reviewed to help ensure the appropriate GX valve is selected for the
application. This sizing review should be completed using current Fisher valve sizing
software. The following tables provide the necessary catalog sizing and capacity
information to compare the CE valve to the GX valve.
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