Guide: Management of Change-Replacement of Fisher D2 FloPro Control Valves with Fisher D2T FloPro Control Valves
Table of contents
Loading...Fisher Guide: Management of Change-Replacement of Fisher D2 FloPro Control Valves with Fisher D2T FloPro Control Valves Manuals & Guides
Management of Change Guide
September 2018
D352330X012
Replacement of Fisher™ D2 FloPro Control
Valves with Fisher D2T FloPro Control Valves
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
D2 FloPro and D2T FloPro Control Valve
Comparison ....................................................4
Congurable Body .............................................................. 4
Capacities (Cv) .................................................................... 4
Dimensions ........................................................................ 5
Approximate Control Valve Assembly Weights .................... 5
Conclusion ......................................................5
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
The Fisher D2 FloPro control valve is a compact, rugged valve designed for on/off
control. This valve is ideal for use as a dump valve on gas separators and scrubbers.
It is also well-suited for other high pressure applications in natural gas production,
compression, and processing. The D2 FloPro valve has threaded end connections
and is available in an NPS 1 globe style valve body specied for ASME B16.34 CL900
service. Fisher D2 FloPro valves are obsolete, effective September 2014, and have
transitioned to D2T FloPro valves.
MOC: D2 to D2T FloPro Valve
September 2018
D352330X012
The Fisher D2T FloPro control valve is an end user-congurable globe or angle valve
that offers additional installation exibility over the D2 FloPro control valve. This
exibility, paired with the design features of the D2 FloPro, creates a control valve
that can be utilized in a variety of applications in the oil and gas industry.
For more information regarding other Fisher oil & gas products, please contact your
local Emerson sales ofce.
Question & Answer Checklist
Q: Does the proposed modication cause any changes to the piping and
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instrumentation diagram (P&ID)?
A: Possibly, depending on valve conguration—angle or globe.
Globe valve conguration would not change P&ID, but an angle
conguration would require modication to the P&ID.
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, valve capacity does not change.
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Q: Does the proposed modication change process ows?
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A: No, valve capacity does not change.
Q: Does the proposed modication change existing pressure relief cases?
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A: No. The D2 FloPro and D2T FloPro valve share the same maximum
rated Cv and should not require review. Pressure relief valve sizing is
not considered when sizing and selecting Fisher control valves for enduser applications. If the control valve is determined to affect upstream
of downstream safety relief cases, review by the end user or third
party is recommended.
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, although they may have been updated since the Fisher D2 FloPro
control valve was installed.
MOC: D2 to D2T FloPro Valve
September 2018
D352330X012
Q: Does the proposed modication change the materials of construction,
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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
maintenance as required by the old equipment items.
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 Fisher D2T
FloPro valves.
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Q: Does the proposed modication introduce new equipment items that
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require spares or obsolete spares for existing equipment?
A: No.
Q: Does the proposed modication permanently remove the spares for
existing pieces of equipment?
A: No. Spare parts are unchanged between the D2 FloPro and D2T FloPro
valve. The valve body and outlet plug, which are not spare parts, are
the only changed components.
Q: Does the proposed modication change the inspection scope or
inspection interval?
A: No.
MOC: D2 to D2T FloPro Valve
September 2018
D352330X012
Q: Does the proposed modication require welding work to be
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performed?
A: No.
Q: Have the materials of construction been reviewed to ensure that the
metallurgy is correct?
A: Yes.
D2 FloPro and D2T FloPro Control Valve Comparison
The following sections are intended to provide a nominal comparison between
Fisher D2 FloPro and Fisher D2T FloPro control valves.
Configurable Body
Unlike the globe body style of the D2 FloPro, the D2T FloPro includes a pipe plug
that allows for the D2T body to be congured as a globe valve or angle valve. This
plug is attached and shipped in the bottom port, but can be moved to the side port
for the angle valve conguration.
Capacities (Cv)
D2 FloPro and D2T FloPro have the same capacity. Sizing review should be
completed using current Fisher sizing software. For more information on control
valve sizing, please contact your Emerson local business partner or sales ofce.
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Dimensions
Dimensions of the D2 FloPro and D2T FloPro are the same with the exception of the
height of the control valve body (specically the valve center to bottom measurement)
as illustrated below. Please reference Figures 1 and 2 for dimensional differences.
Approximate Control Valve Assembly Weights
Exact weight of a specic assembly is dependent upon trim material, end
connections, etc. Table 1 provides a general sense of the weight differences. For more
specic information, please contact your local Emerson sales ofce.
MOC: D2 to D2T FloPro Valve
September 2018
D352330X012
NPS
1 7.7 (17) 7.7 (1.7)
Table 1. Approximate Assembly Weights
Fisher D2 FloPro Fisher D2T FloPro
kg (lb)
Conclusion
Emerson offers the Fisher D2T FloPro control valve as a replacement for the obsolete
Fisher D2 FloPro control valve. The Fisher D2T FloPro control valve offers additional
installation exibility for customers by allowing globe and angle congurations while
maintaining the current ow capabilities of the obsolete D2 FloPro control valve
product line.
Figure 1. Fisher D2 FloPro Valve Dimensions
Figure 2. Fisher D2T FloPro Valve Dimensions
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Additional Resources
Contact your local Emerson sales ofce for additional details or questions regarding
the Fisher D2T FloPro control valve or see the resources below.
D2T Product Bulletin (D10xxxxX012)
D2T Instruction Manual (D10xxxxX012)
MOC: D2 to D2T FloPro Valve
September 2018
D352330X012
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