Fisher Management of Change Guide: Replacement of 2625 Volume Boosters with Fisher SS-263 Boosters Manuals & Guides
Management of Change Guide
Replacement of Fisher™ 2625 Volume
Boosters with Fisher SS-263 Volume
Boosters
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
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Comparison of 2625 to SS-263
Volume Boosters .............................................4
Conclusion ......................................................6
Additional Resources ......................................6
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
Fisher™ 2625 volume boosters are found in almost every industry and have an
extensive service history. Volume boosters are used to amplify the pneumatic
positioner output to an actuator, thereby increasing the speed and responsiveness
of a valve actuator. As many as three 2625 volume boosters can be replaced with
just one Fisher SS-263 volume booster, reducing the size and complexity of the
installation. The purpose of this guide is to simplify the transition from existing
2625 volume boosters to new SS-263 volume boosters.
MOC: SS-263 Volume Boosters
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Contained in this guide are two sections: the rst contains questions and answers
and the second compares the SS-263 to the 2625 volume booster. The rst section
helps users complete Management of Change (MOC) approval documents when
upgrading to the SS-263. The second section helps users better understand the
differences and similarities between the SS-263 and 2625.
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?
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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.
Q: Does the proposed modication change the materials of construction,
such as a change in material form (cast, forged, or alloy)?
A: No.
MOC: SS-263 Volume Boosters
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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 sales ofces offer local training and support to help
ensure operators, maintenance personnel, and instrument technicians
are trained on SS-263 volume boosters.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: Yes. Spares for old equipment items cannot be used with new
equipment items due to differences in design between the old and
new equipment items. Documentation on recommended spares can
be obtained by contacting your local Emerson sales ofce.
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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 change the Hazardous Electrical Area
Classication?
A: No.
Comparison of 2625 to SS-263 Volume Boosters
The SS-263 is essentially a higher capacity 2625 volume booster allowing up to
three 2625s to be replaced with just one SS-263. The theory of operation of the
two products is identical with the only differences being in features and design
specications. The SS-263 includes special noise attenuating exhaust trim, which
results in quieter operation than the 2625 as well as a special mounting ange
adaptor for easy installation and maintenance. A 3-in-1 pressure connection on
the SS-263 also provides a single connection point for either a pressure gauge,
actuator bypass assembly, or other accessory hookup. Comparisons of other design
specications between the two products are given in Table 1 and cross sectional
views of each product are given in Figures 1 and 2.
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Specication SS-263 2625
Maximum Flow Capacity
Input Signal Positioner Output
Maximum Input Signal Pressure 10.3 bar (150 psig)
Maximum Supply Pressure 10.3 (150 psig)
Input-to-Output Pressure Ratio Fixed at 1:1
Operative Temperature Limits -40 to 71˚C (-40 to 160˚F)
Hazardous Area Classication ATEX Group II Category 2 Gas and Dust
Input Signal Connection 1/4 NPT
Supply Connection 1 NPT 3/4 NPT
Output Connection
Approximate Weight No change 5”
1. When used on a piston actuator, installation of the SS-263 is not available on a spring-and-diaphragm actuator.
2. The Fisher 2625NS volume booster can be used up to 93°C (200°F).
Table 1. Design Specications Comparison
9.50 Cv Exhaust
9.50 Cv Supply
1 NPT
1-1/4 NPT
2.72 Cv Exhaust
4.98 Cv Supply
3/4 NPT
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MOC: SS-263 Volume Boosters
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Figure 1. SS-263 Volume Booster (Cross Sectional View)
Figure 2. 2625 Volume Booster (Cross Sectional View)
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on dark backgroundson light backgrounds
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Conclusion
The SS-263 is a higher capacity 2625 volume booster. The only differing areas
between these two products affecting a valve assembly retrot in a process plant
are maintenance procedures, training of maintenance department craftsmen, and
spare parts. Since the theory of operation is the same between these two products,
the maintenance procedures are also very similar; however, due to differences in
design, spare parts for the 2625 cannot be used in the SS-263 booster.
Additional Resources
Contact your local Emerson sales ofce for more information about SS-263 volume
boosters or view the materials below.
Instruction Manual
Product Bulletin
MOC: SS-263 Volume Boosters
September 2018
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Visit Fisher.com to
nd an Emerson sales
contact in your area.
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Emerson Automation Solutions
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Cernay, 68700 France
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Singapore 128461 Singapore
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