Management of Change Guide: Replacement of Fisher™ 667 Sizes 30-76 Diaphragm Actuators with Sizes 30i-76i Diaphragm Actuators
Fisher Management of Change Guide: Replacement of Fisher™ 667 Sizes 30-76 Diaphragm Actuators with Sizes 30i-76i Diaphragm Actuators Manuals & Guides
Management of Change Guide
Replacement of Fisher™ 667 Sizes 30-76
Diaphragm Actuators with Sizes 30i-76i
Diaphragm Actuators
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
July 2017
D352495X012
Comparison of 667 and 667 Size i Actuators ....5
Scope of Sizes ..................................................................... 5
Instrument Attributes ........................................................ 5
Side-Mounted Handwheel .................................................. 6
Integral Mounting FIELDVUE Instruments with Internal Air
Passage .............................................................................. 6
Other Instrument and Accessory Mounting ........................ 6
Approximate Actuator Weights .......................................... 7
Conclusion ......................................................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
The Fisher 667 spring-opposed diaphragm actuator positions the valve plug in
response to varying controller or valve positioner pneumatic output signals applied
to the actuator diaphragm. The 667 actuator is reverse-acting and is designed to
provide dependable on/off or throttling operation of automatic control valves.
The 667 size i spring-opposed diaphragm actuator features an updated yoke design
to increase reliability and reduce complexity, and incorporates an integrated
mounting for Fisher FIELDVUE
eliminates the requirement for traditional external instrument tubing and ttings
when paired with a FIELDVUE DVC2000 or DVC6200 digital valve controller.
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instruments. An internal air passage feature
MOC: 667 Sizes 30i-76i Actuators
July 2017
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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: No.
Q: Does the proposed modication change process ows?
A: No.
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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. However, they may have been updated since installation.
Q: Does the proposed modication change the materials of construction,
such as a change in material form (cast, forged, or alloy)?
A: No.
MOC: 667 Sizes 30i-76i Actuators
July 2017
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Q: Does the proposed modication introduce new equipment items that
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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.
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. Emerson local business partners and sales ofces offer local
training and support to help ensure operators, maintenance
personnel, and instrument technicians are trained on the 667 sizes 30i
through 76i actuators.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: No. Existing spares for the 667 sizes 30 through 76 are compatible
with the 667 sizes 30i through 76i actuators.
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