Chemical Engineering July 2012 - 48

Environmental Manager
Final analysis
In summary, established overpressureprotection-analysis
philosophies are
not well suited to identify possible material
concerns as a result of process
fluid flashing and depressuring. Reliefdevice
and effluent-handling sizing
conventions and simplified calculation
methodologies limit the ability of the
designer to recognize potential MDMT
concerns. Understanding the inherent
limitations of current overpressure-protection-analysis
practice is key to develReferences
1.
API Standard 520, " Sizing, Selection, and
Installation of Pressure-Relieving Devices
in Refineries, Part I - Sizing and Selection " ,
8th Ed., December 2008.
2. API Standard 520, " Sizing, Selection, and
Installation of Pressure-Relieving Devices in
Refineries, Part II - Installation " , 5th Ed.,
August 2003.
3. ISO 23251:2006 (API Standard 521), " Petroleum,
Petrochemical and Natural Gas Industries
- Pressure-relieving and Depressuring
Systems " , 1st Ed., August 2006.
4. Coats, and others, " Guidelines for Pressure
Relieving Systems and Effluent Handling " ,
1st Ed., Center for Chemical Process Safety
of the American Institute of Chemical Engineers,
1998.
5. Gas Processors Suppliers Association, " Engineering
Data Book " , 12th Ed., 2004.
6. Perry, R.H., D.W. Green, and J.O. Maloney,
editors, " Perry's Chemical Engineering
Handbook " , McGraw-Hill, 7th Ed., 1997.
7. ASME B31.3-2008, " Process Piping " , December
31, 2008.
oping a more robust overpressure protection
analysis heuristic, which more
fully recognizes the effects of low temperature
flashing on material design.
It is the experience of the authors
that modification of the typical overpressure-protection-analysis
philosophy
to identify and propose alternative
solutions for conditions resulting
in excursions beyond MDMT is prudent
in promotion of enhanced facility
process-safety management.
■
Edited by Dorothy Lozowski
Authors
Aubry Shackelford is a
principal engineer for Inglenook
Engineering, Inc., which
provides process engineering
consulting with a specific
focus on process safety management
(15306 Amesbury
Lane, Sugar Land, TX 77478;
Email: aubry@inglenookeng.
com; Phone: 713-805-8277).
He holds a B.S.Ch.E. from
Northeastern University and
is a professional engineer licensed in the state of
Texas and the province of Alberta (Canada).
Brian Pack is the area engineering-support
team leader
for the Mid-Continent operations
area in North America
gas region for BP America
Production Co. (501 Westlake
Park Blvd., Houston, TX
77079; Email: brian.pack@
bp.com; Phone: 281-366-1604).
He holds a B.S.Ch.E. from the
University of Oklahoma and
is a professional engineer licensed
in the states of Texas and Oklahoma.
Note
The views in this paper are entirely
the authors and do not necessarily reflect
the views of BP America Production
Co. or its affiliates.
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 Low-Pressure Measurement
for Control Valves
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Chemical Engineering July 2012

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