fssa pipe design handbook 2nd edition 1

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  • 7/26/2019 FSSA Pipe Design Handbook 2nd Edition 1





    For Use With

    Special Hazard

    Fire Suppression


  • 7/26/2019 FSSA Pipe Design Handbook 2nd Edition 1


    FSSA PDH-01


    For Use With



    Second EditionAugust 2003

    Fire Suppression Systems Association5024-R Campbell Boulevard

    Baltimore, Maryland 21236-5974

    Phone: (410) 931-8100Fax: (410) 931-8111

    2003 by the Fire Suppression Systems Association. All Rights Reserved. No part of thisbook may be reproduced or transmitted in any form or by any electronic or mechanicalmeans, including photocopy, xerography, recording, or by use of any information or storageand retrieval system, without prior written permission of the publisher.

  • 7/26/2019 FSSA Pipe Design Handbook 2nd Edition 1


    FSSA PDH-01 FSSA Pipe Design HandbookAugust 2003

    Page 1 of 1

    Tableof Contents


    Forward, Introduction & Definitions 1

    Design Criteria 2

    Pipe Pressure Tables 3

    Pipe & Fittings- Rated Working Pressure 4

    Special Requirements for Closed Sections of Piping 5

    Pipe Supports and Hangers 6

    Appendix A: Pipe Requirements for FSSA Equipment Manufacturers 7Engineered Systems

    Appendix B: Pipe Fittings for use in CLEAN AGENT SYSTEM 8 Piping

    Appendix C: References 9

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    FSSA PDH-01 FSSA Pipe Design HandbookAugust 2003

    Section 1 / Page 1 of 3


    The Fire Suppression Systems Association (FSSA) has developed this handbook to provideguidance to system designers on how to apply the ASME B31.1 Power Piping Code in a uniformand consistent manner, in order to determine the maximum allowable internal working pressurefor piping used in special hazard fire suppression systems.

    The FSSA Technical Committee was assigned the task to address this issue. The resultingdocument provides the necessary guidelines, along with supplemental information, to assist thesystem designer in complying with the requirements specified in the applicable NFPA Standardsrelated to the Power Piping Code. This handbook is currently referenced in several of the NFPAstandards.

    The first edition of this document was published in June 2001.

    The second edition of the handbook was published in August 2003, and includes revisions toSection 3, Appendix A, and Appendix C; along with the addition of new Section 6 and newAppendix B.

    CAUTIONThis document provides general guidelines and is not intended to provide all information

    necessary to determine equipment and material requirements for specific installations orapplications. Always refer to the equipment manufacturers instructions and recommendations,along with other regulations and NFPA Standards that may apply.

    Some limitations and restrictions apply. Please refer to the text and notes, which follow.

    This document is subject to modifications. Users should obtain the latest version. TheAssociation, its members, and those participating in its activities accept no responsibility orliability to any one for the completeness or use of, or reliance on this document, or forcompliance with the provisions herein.

  • 7/26/2019 FSSA Pipe Design Handbook 2nd Edition 1


    FSSA PDH-01 FSSA Pipe Design HandbookAugust 2003

    Section 1 / Page 2 of 3


    This document provides general information and guidelines on the design of piping and tubingsystems for use with all types of special hazard fire suppression systems, where the ASMEB31.1 Power Piping Code is specified. This Guide follows the general design parameters of thePower Piping Code, but has been modified similar to the accepted formats found in NFPA-12Aand NFPA-2001.

    An expanded list of pressure Tables are found in Section 3. These Tables provide the systemdesigner with maximum allowable internal working pressures that have been pre-calculated forvarious types of pipe and tubing materials and end connections.

    In all cases, the pipe and fittings shall have a minimum rated working pressure equal to orgreater than the minimum piping design working pressure specified in Appendix A of thisdocument, for the agent being used.


    Some terms used in this document, related to pipe and tubing and supports / hangers aredefined below.

    Brazing:A metal joining process where fusion is produced by use of a nonferrous filler metal having amelting point above 800oF (425oC) but lower than that of the base metals used. The filler metalis distributed between the closely fitted surfaces of the joint by capillary action.

    But t Joint :A joint between two members lying approximately in the same plane.

    Filler Metal:

    Metal that is added during welding, soldering, or brazing.

    Full Fi l let Weld:A fillet weld whose size is equal to the thickness of the thinner member joined.

    Maximum Allo wable Stress (SE):The maximum stress value that may be used in the design formulas for a given material anddesign temperature. These valves are given in the Tables in Appendix A of the Power PipingCode, and in Table 2-1 of this document; and include the longitudinal seam joint efficiencyfactors.

    Maximum Al low able Working Pressure:

    The pressure at a coincident temperature to which the piping can be subjected withoutexceeding the maximum allowable stress.

  • 7/26/2019 FSSA Pipe Design Handbook 2nd Edition 1


    FSSA PDH-01 FSSA Pipe Design HandbookAugust 2003

    Section 1 / Page 3 of 3

    Nominal Thickness:The thickness given in the product material specification or standard, exclusive ofmanufacturing tolerances.

    Pipe and Tube:The fundamental difference between pipe and tube is the dimensional standard to which each is

    manufactured. For use in this document both have a round cross section.

    A pipe is a tube of round cross section conforming to the dimensional requirements fornominal pipe size as tabulated in ANSI B36.10.

    A tube is a hollow product of round cross section that may be specified with respect toany two, but not all three of the following: outside diameter, inside diameter, and wallthickness. (Types K, L, and M copper tube may also be specified by nominal size andtype only).

    Electr ic Resistance Welded Pipe and Tubing (ERW):

    Pipe or tubing having a longitudinal butt joint where fusion is produced by the heat obtained

    from resistance to the flow of electric current in a circuit of which the pipe/tubing is a part, andby the application of pressure.

    Furnace Butt Welded Pipe:

    Pipe having its longitudinal butt joint forge welded by mechanical pressure developed in drawingthe furnace heated metal through a cone shaped die which serves as a combined forming andwelding die.

    Electr ic Fusion Welded Pipe:Pipe having a longitudinal butt joint where fusion is produced in the preformed metal by manualor automatic arc welding. The weld may be made with or without the use of filler metal.

    Seamless Pipe:Pipe produced by several methods that result in a round pipe that does not have a longitudinalseam.

    Solder ing:A metal joining process where fusion is produced by heating to a suitable temperature and byusing a nonferrous alloy that melts at temperatures below 800oF (425oC) and having a meltingpoint below that of the base metals being used.

    Rigid Supp ort :

    The method of securing pipe or tubing to walls, ceiling structures or columns to preventmovement in any direction.

    Intermediate Supp ort :

    The method of supporting piping or tubing to counter the force of gravity. The supports arenormally located between rigid supports, but are not intended to counter longitudinal or lateralsway, or as bracing against thrusts associated with changes in direction.

  • 7/26/2019 FSSA Pipe Design Handbook 2nd Edition 1


    FSSA PDH-01 FSSA Pipe Design HandbookAugust 2003

    Section 2 / Page 1 of 5


    All calculations to determine the maximum allowable working pressure for various types of pipeand tubing, shall be based on the ASME B31.1 Power Piping Code, 1998 edition, (includingB31.1a 1999 Addenda; & B31.1b 2000 Addenda); and as modifiedherein for use in all types ofspecial hazard fire suppression systems:

    The criteria specified follows the basic format found in NFPA-12A and NFPA-2001, and coverspressure-temperature ratings for allowable stress, longitudinal joint efficiencies, end connectionfactors, and other allowances and limitations used in the design of actuation and distributionsystem piping.

    2.1 Limitations established for pipe and tubing, used in special hazard fire suppressionsystems, are set by:(Note: Where the word pipe is used it is understood to also mean tubing).

    (a) Maximum pressure expected in the pipe, or as specified in the applicable NFPAStandard.

    (b) Materials of construction of the pipe, tensile strength, yield strength, and temperaturelimitations of the material.

    (c) End connection joining methods, (e.g. threaded, welded, grooved, etc.).(d) Pipe construction method, (e.g. seamless, ERW, furnace welded, etc.).(e) Pipe diameter.(f) Pipe wall thickness.(g) Cast iron pipe, steel pipe conforming to ASTM A-120, aluminum pipe, or non-metallic

    pipe, shall notbe used.

    2.2 The calculations are based on the following:(a) The appropriate maximum allowable stress value (SE) shall be taken from Appendix

    A of the Power Piping Code (PPC).(b) The