Management of Change Guide
Fisher™ NotchFlo™ DST Control Valves
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
D351980X012 / September 2018
Fisher NotchFlo DST and Masoneilan
LincolnLog Valve Comparison .........................4
Face-to-Face Dimensions .................................................... 4
Allowable Particle Size ........................................................ 5
Weight ............................................................................... 5
Valve Performance with Positioner ...................................... 5
Trim Materials ..................................................................... 6
Conclusion ......................................................7
Additional Resources ......................................7
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
With an installed base over one thousand units, the Fisher NotchFlo DST control
valve has proven to be the valve of choice for critical service applications containing
entrained particulate. In many cases the Fisher NotchFlo DST outperforms existing
control valves by providing improved control and reliability for critical service valve
applications. The purpose of this document is to simplify the transition from existing
control valve technologies, which are beyond their service life or no longer provide
the control and reliability required, to the proven reliable Fisher NotchFlo DST.
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Contained in this document are two sections. First there is a Question and Answer
section to help end users complete Management of Change approval documents
when upgrading to a Fisher NotchFlo DST control valve. Then there is a side by side
comparison of the Fisher NotchFlo DST and the Masoneilan LincolnLog. In this section,
in addition to the similarities between these two valves, you will see a number of
advantages the NotchFlo DST design has compared to the LincolnLog design. These
comparisons demonstrate how the NotchFlo DST can allow users to safely and
efciently replace existing problematic control valves for critical service applications.
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. There will be no change in the existing P&IDs.
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.
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Q: Does the proposed modication change process ows?
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A: No. The modication doesn’t change the process ow direction.
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: Have the operating and design conditions (ow, temperature,
pressure, process uids) of the proposed modication changed?
A: No.
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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: Not generally, but there are certain isolated cases, where the material
form (cast to forged bodies) changes. Be sure to review trim material
comparison thoroughly to assure there are no compatibility issues.
Q: Does the proposed modication introduce new equipment items that
require periodic predictive maintenance?
A: No. The new 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: Yes. The Emerson network of Local Business Partners offers local
training and support to ensure operators; maintenance personnel,
and instrument technicians are fully trained on the Fisher NotchFlo
DST control valve.
Q: Does the proposed modication change existing pressure relief cases?
A: No, as long as the replacement selection doesn’t exceed the
maximum rated Cv of the existing valve.
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Q: Does the proposed modication introduce new equipment items that
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require spare parts, training manuals, maintenance procedures or
training to maintenance department?
A: Yes. The new equipment items require spare parts, training manuals,
maintenance procedures, and training to maintenance department
that are specic to the new Fisher equipment items.
Q: Does the proposed modication permanently remove the spares for
existing pieces of equipment?
A: Yes. The spare parts of the existing equipment items have to be
removed from the plant.
Q: Does the proposed modication require welding work to be
performed?
A: No, unless the existing and new valve have welded end connections.
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Q: Does the proposed modication change the inspection scope or
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inspection interval?
A: No.
Fisher NotchFlo DST and Masoneilan LincolnLog Valve Comparison
Even though NotchFlo DST and LincolnLog look physically similar, there are certain
key differences and advantages in the design of the NotchFlo DST valve. This section
provides insight on the differences between the two valves.
Face-to-Face Dimensions
The globe NotchFlo DST valve has same face-to-face dimensions as that of
LincolnLog. The table below is an example of few sizes of the NotchFlo and
LincolnLog.
Valve Size
2 14.75 14.75
3 18.12 18.12
4 20.88 20.88
Table 1. Face to Face Dimension (in inches) of CL1500 NotchFlo DST and LincolnLog
Face-to-Face Dimensions (inches)
NotchFlo LincolnLog
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The angle NotchFlo DST valve is more compact when compared to LincolnLog.
However, in case of MRO replacements, if customer could not change their
piping, or accept spool pieces, forged NotchFlo DST valve with special face to face
dimensions can be offered to meet the customer piping requirements.
Allowable Particle Size
The main issue that needs to be addressed in the dirty service is clogging due to
the particles present in the service. For a given valve size, the Fisher NotchFlo DST
can pass larger debris when compared with Masoneilan LincolnLog. The table below
shows the particle size as claimed by the manufacturer that NotchFlo DST and
LincolnLog can pass.
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Valve Type
Fisher
NotchFlo
DST
Masoneilan
LincolnLog
Table 2. Maximum particle size (in inches) that NotchFlo DST and LincolnLog could pass
1 2 3 4 5 6
0.12 0.24 0.33 0.43 0.46 0.92
0.1 0.2 0.3 0.4 0.45 0.8
Valve Size (NPS)
Weight
On average, a NotchFlo DST valve is 25% lighter than a LincolnLog valve.
Valve Performance with Positioner
The Fisher NotchFlo DST valve with the FIELDVUE™ digital valve controller offers
superior performance when compared to the Masoneilan LincolnLog valve with
SVI® II AP positioner. With over one million FIELDVUE digital valve controllers sold,
its state-of-the-art technology combined with the NotchFlo DST valve provides
complete control over the process.
Figure 1. NotchFlo Plug
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MOC: NotchFlo DST Control Valves
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Figure 2. Exploded View of NotchFlo Valve
Trim Materials
The Fisher NotchFlo DST valve has several trim options as shown in table 3. It can be
offered with trim materials matching existing Masoneilan LincolnLog installations.
The Fisher NotchFlo DST valve can also be offered with trim materials that are
superior to Masoneilan LincolnLog trim materials. The table below shows the trim
materials that are offered in standard and NACE services.
Trim
Cage 17-4 PH H1075 17-4 PH H900 Nitronic 50 Nitronic 50
Plug S44004 (440C) 410 SST 17-4 PH DBL H1150 17-4 PH H1150M
Seat Ring S44004 (440C) 316 Hardfaced 316 Hardfaced 316 Hardfaced
Stem S20910 (Nit 50) 17-4 PH H1075 S20910 (Nit 50) S20910 (Nit 50)
Table 3. Trim Materials of NotchFlo DST and LincolnLog
Standard Construction NACE Construction
NotchFlo LincolnLog NotchFlo LincolnLog
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Conclusion
Reliable Fisher control valves have been used in the process control industry for
more than 130 years. With a superior design, the Fisher NotchFlo DST control
valve offers multiple advantages that allow the user to transition from existing
problematic control, avoiding lengthy MOC approval documents.
Additional Resources
Product Bulletin: NotchFlo DST Valve
Instruction Manual: NotchFlo DST Valve
Webpage: NotchFlo DST Valve
MOC: NotchFlo DST Control Valves
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http://www.Facebook.com/FisherValves
http://www.Twitter.com/FisherValves
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http://www.YouTube.com/user/FisherControlValve
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