Management of Change Guide
Replacement of Fisher™ 657 Diaphragm
Actuators Sizes 30-70 with Sizes 30i-70i
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
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Comparison of 657 and 657 Size i Actuators ....4
Scope of Sizes ..................................................................... 4
Instrument Attributes ........................................................ 5
Side-Mounted Handwheel .................................................. 6
Other Instrument and Accessory Mounting ........................ 6
Approximate Actuator Weights .......................................... 6
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
The Fisher 657 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 657 actuator is direct-acting. This actuator is designed
to provide dependable on/off or throttling operation of automatic control valves.
The 657 size i spring-opposed diaphragm actuator provides an updated yoke
design to increase reliability and reduce complexity by incorporating an integrated
mounting for Fisher FIELDVUE™ instruments.
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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.
Q: Does the proposed modication change existing pressure relief cases?
A: No.
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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 Fisher 657 actuators
were installed.
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.
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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. Emerson sales ofces offer local training and support to help
ensure operators, maintenance personnel, and instrument technicians
are trained on Fisher 657 size i actuators.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: No. Existing spares for 657 sizes 30 through 70 actuators are
compatible with 657 sizes 30i through 70i actuators.
Q: Does the proposed modication permanently remove the spares for
existing pieces of equipment?
A: No.
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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.
Q: Does this update limit what can be mounted to the current product?
A: No. The 657 sizes 30i through 70i actuators are backwards
compatible with current instruments and accessories. They may
require a different mounting kit, but all instruments and accessories
that are currently available will be offered for the size i. Refer to the
Other Instrument and Accessory Mounting section of this document
for more information.
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Q: How does the 657 size i actuator utilize instrument tubing?
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A: The 657 actuator sizes 30i through 70i will utilize external instrument
tubing, as they do today. The yoke design will have the integrated
FIELDVUE instrument mounting.
Comparison of 657 and 657 Size i Actuators
The following information is intended to provide a general comparison between
current Fisher 657 sizes 30 through 70 and 657 sizes 30i through 70i actuators.
Scope of Sizes
Table 1 describes the scope of actuators that will have the size i designation. The
actuator nameplate and serial card included with the actuator shipment will designate
the actuator size and identify it as a size i. Note: Not all sizes of the current Fisher 657
actuator portfolio will be offered as a size i.
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Current Size New Size Yoke Boss Size
30 30i 2-1/8”
34 34i 2-1/8”
40 40i 2-13/16”
45 45i 2-13/16”
46 46i 2-13/16”
50 50i 3-9/16”
60 60i 3-9/16”
70* 70i* 3-9/16”
87 No change 5”
80 No change 5”
100 No change 5”
*Includes the 657-4 actuator.
Table 1. 657 Size Conversion
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Instrument Attributes
The 657 size i actuator has an updated design that increases reliability and reduces
complexity by integrating the FIELDVUE instrument mounting. This approach
eliminates the need for the traditional mounting bracket, so the number of parts
required to mount a FIELDVUE instrument to the size i actuator has been reduced by
half, and the steps required to position the feedback array have decreased. This
mounting allows FIELDVUE DVC2000 and DVC6200 digital valve controllers to be bolted
directly to the yoke of the size i actuator, which results in a faster and simpler mounting
procedure. The key differences in the mounting design are compared in Figures 1 and 2.
Figure 1. 657 Size 40 Actuator with DVC6200 Digital Valve Controller
Figure 2. 657 Size 40i Actuator with DVC6200 Digital Valve Controller
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Side-Mounted Handwheel
The side-mounted handwheel on Fisher 657 actuators has traditionally been
attached with a combination of U-bolts, hook bolts, cap screws, and nuts (as shown
in Figure 3). The 657 sizes 34i through 60i actuators incorporate cast mounting
pads that simplify the mounting procedure and reduce mounting hardware
required to attach the handwheel by 50%. The key differences are noted by
comparing Figures 3 and 4.
Other Instrument and Accessory Mounting
All other actuator-mounted instruments will continue to utilize the traditional yoke
mounting pads or casing brackets on the 657 size i actuator (including non-integral
mounted DVC2000 and DVC6200 digital valve controllers). These mounting
kits have been modied, where necessary, in order to provide compatibility. It
is important to note that some older kits cannot be used with the size i actuator
due to interference with the cast pads of the yoke. Therefore, when installing any
instrument on the size i actuator, be sure to order an updated mounting kit.
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Figure 3. 657 Actuator with
Side-Mounted Handwheel
The following able summarizes which mounting kits have been updated. For more
specic information regarding mounting kit compatibility, contact your local
Emerson sales ofce.
Instrument Type Mounting Kit Change
3582 Positioner New connecting arm
3600 Positioner Incompatible, new kit design required
4200 Position Transmitter New connecting arm
4300 Wireless Position Monitor New mounting bracket and stem connector
546, 646, 846, and i2P-100
Transducers
DVC2000/DVC6200 Instruments
with Traditional Bracket Mounting
DVC5000/DVC6000 Instruments
with Traditional Bracket Mounting
New spacers and bolts for yoke mounting
No change
No change
C1 Controller No change
4194, 4195K, and 4196 Controllers No change
VBL Booster No change
2625 Booster No change
TopWorx™ Switches No change
Table 2: Mounting Kit Updates
Figure 4. 657 Size i Actuator
with Side-Mounted Handwheel
Approximate Actuator Weights
Fisher 657 size i actuators are slightly heavier than 657 actuators due to the
integral yoke mounting pads. Exact weight of a specic actuator assembly is
dependent upon instruments and accessories mounted to the actuator. Table 3 lists
approximate weights of actuator-only assemblies. For more specic information,
contact your local Emerson sales ofce.
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Size kg lb Size kg lb
30 16 36 30i 17 38
34 22 48 34i 25 54
40 23 51 40i 25 56
45 37 82 45i 40 89
46 49 107 46i 52 114
50 42 92 50i 45 99
60 53 116 60i 56 123
70 107 235 70i 109 240
Table 3: Approximate 657 Actuator-Only Assembly Weights
Conclusion
The enhanced Fisher 657 sizes 30i through 70i actuators reduce complexity and
increase reliability to simplify maintenance and reduce downtime. The 657 size
i actuators incorporate an integrated mounting pad for FIELDVUE instruments
and simplify the side-mounted handwheel mounting by reducing the number
and complexity of parts required. With these enhancements, the Fisher 657 size i
actuators simplify installation and maintenance steps, and increase the reliability of
this time-tested actuator platform.
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Additional Resources
Please contact your local Emerson sales ofce for additional details or questions
regarding Fisher 657 size i actuators.
657 Product Bulletin
657 Instruction Manual
657 Actuator Webpage
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