Safety Valve Engineering Handbook.pdf

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Crosby Valve Inc.
Technical Document No. TP-V300
Effective: May 1997
Crosby
®
Pressure Relief Valve
Engineering Handbook
An FMC Corporation subsidiary
Table of Contents
Notes:
CROSBY
®
Pressure Relief Valve
ENGINEERING HANDBOOK
click on chapter for quick access
CONTENTS
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Appendix
Other
Information
Introduction to Crosby Engineering Handbook
Fundamentals of Pressure Relief Valve Design
Terminology
Codes and Standards - Summary
Valve Sizing and Selection - U.S.C.S.* Units
Valve Sizing and Selection - Metric Units
Engineering Support Information
ASME Section VIII, Division 1, 1992 Edition Exerpts
Ordering Information
Pressure Relief Valve Specification Sheet
Warning: The information contained in this handbook is for informational purposes only.
See also Crosby's computer sizing program, CROSBY-SIZE. The actual selection of valves
and valve products is dependent upon numerous factors and should be made only after
consultation with applicable Crosby personnel. Crosby assumes no responsibility for the
actual selection of such products and hereby expressly disclaims liability for any and all
claims and damages which may result from the use or application of this information or from
any consultation with Crosby personnel.
*
United States Customary System
Crosby
®
Engineering Handbook
Technical Publication No. TP-V300
Chapter I
HOME
Introduction
The Crosby
®
Pressure Relief Valve Engineering Hand-
book contains important technical information relating
to pressure relief valves.
The primary purpose of a pressure relief valve is protec-
tion of life and property by venting fluid from an
overpressurized vessel. Information contained in this
handbook applies to the overpressure protection of
pressure vessels, lines and systems.
Reference is made to the ASME Boiler and Pressure
Vessel Code, Section VIII, Pressure Vessels. The
information in this handbook is NOT to be used for
the application of overpressure protection to power
boilers and nuclear power plant components which
are addressed in the ASME Boiler and Pressure
Vessel Code, Section I, Power Boilers, and Section
III, Nuclear Power Plant Components, respectively.
Proper sizing, selection, manufacture, assembly, test,
installation and maintenance of a pressure relief valve
are all critical to obtaining maximum protection.
This handbook has been designed to provide a service
to Crosby’s customers by presenting reference data and
technical recommendations based on our many years of
experience in sizing, selecting, testing, installing and
operating pressure relief valves. Sufficient data is
supplied so to properly size and select Crosby pressure
relief valves for specific applications. Information cov-
ering terminology, standards, codes, basic design, siz-
ing and selection information, including examples, are
presented in an easy to use format.
Some of the material in this handbook is reprinted or
excerpted from publications developed by associations
or committees in which Crosby has participated. The
information contained in the manual is offered as a
guide. Those who use the information are reminded of
the limitations of such a publication and that there is no
substitute for qualified engineering analysis.
Crosby pressure relief valves are manufactured in ac-
cordance with a controlled Quality Assurance Program
which meets or exceeds ASME Code Quality Control
Program requirements. Capacities are certified by the
National Board of Boiler and Pressure Vessel Inspec-
tors. These features are assured by the presence of an
ASME Code Symbol Stamp and the letters NB on each
valve nameplate. Crosby's valves are designed, manu-
factured and tested in accordance with a quality man-
agement system approved to the International Stan-
dard Organization's ISO 9000 Quality Standard Series
requirements. With proper sizing and selection, the
user can thus be assured that Crosby products are of
the highest quality and technical standards in the world
of pressure relief technology.
When in doubt as to the proper application of any
particular data, the user is advised to contact the near-
est Crosby Regional Office or Representative. Crosby
has a large staff of highly trained people strategically
located throughout the world who should be contacted
when a question arises. Refer to Crosby's Worldwide
Directory for an up-to-date contact listing.
Crosby's Computer Aided Valve
Sizing Program - "CROSBY-SIZE"
Crosby has designed a computer sizing program,
CROSBY-SIZE,
to provide maximum service to our cus-
tomers by presenting recommendations based on
Crosby's many years of experience. Use of this program
allows an accurate determination of such parameters as
orifice size, maximum flow and predicted sound level.
The program is a powerful tool, yet easy to use. Its many
features include quick and accurate calculations, user
selected units, selection of valve size and style, valve
data storage, printed reports, specification sheets and
dimensional drawings.
1-1
Chapter 1
Introduction
Crosby Engineering Handbook
Program control via pop-up windows, function keys,
extensive on-line help facilities, easy to read formatted
screens, immediate flagging of errors, easy editing of
displayed inputs and other features combine to make
the program easy to understand and operate.
It is assumed that the user of
CROSBY-SIZE
has a basic
understanding of relief valve sizing calculations. The
user is responsible for correct determination of service
conditions and the suitability of this program for a
specific application.
CROSBY-SIZE
and Crosby's Engineering Handbook
are useful tools in sizing pressure relief valves. Should
additional clarification be required, contact Crosby.
1-2

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