ASME_B31.8a-2000.pdf

Date of Issuance:November 16.2001ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for AmericanNational Standards.The Standards Committee that approved the code or standard was balanced to assure thatindividuals from competent and concerned interests have had an opportunity to participate.The proposed codeor standard was made available for public review and comment that provides an opportunity for additionalpublic input from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve.”rate,”or“endorse”any item,construction,proprietary device.or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection withany items mentioned in this document,and does not undertake to insure anyone utilizing a standard againstliability for infringement of any applicable letters patent.nor assume any such liability.Users of a code orstandard are expressly advised that determination of the validity of any such patent rights,and the risk ofinfringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpretedas government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with theestablished ASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form.in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York.NY 10016-5990Copyright2001byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.ASME B31.8a-2000Following approval by the ASME B31 Committee and ASME,and after public review,ASME B31.8a-2000 was approved by the American National Standards Institute on December 13,2000This is the first Addenda to be published to ASME B31.8-1999.It was issued on November 16,2001,andis effective upon date of issuance.Addenda to the 1999 Edition of ASME B31.8 are issued in the form of replacement pages.Revisions,additions,and deletions are incorporated directly into the affected pages.It is advisable,however,that thispage,the Addenda title and copyright pages,and all replaced pages be retained for reference.SUMMARY OF CHANGESReplace or insert the pages listed.Changes given below are identified on the pages by a margin note,A00,placed next to the affected area.Changes made in ASME B31.8-1999 are indicated by(99).The pages notlisted are the reverse sides of the listed pages and contain no changes.PageLocationChangeiii-vContentsUpdated to reflect Addenda7805.217Revised8807Added10811.25Revised11817.11Revised23831.373First and second paragraphs revised31841.11(c)1)Revised36841.231(g)Revised70,70.1850.43(a)Revised and redesignated from 850.43850.43b)Added850.43(c)Added850.44Revised74,74.1851.9Added851.10Added851.11Redesignated from 851.976,76.1852.52Second paragraph added95,95.1A802.3Added96,96.1A803Definition of return interval revised(c)CONTENTSForeword.viiPersonnelixIntroductionxiiiSummary of ChangesXVGeneral Provisions and Definitions801General1802Scope and Intent.803Piping Systems Definitions.804Piping Systems Component Definitions.4805Design,Fabrication,Operation,and Testing Terms.6807Quality AssuranceChapter IMaterials and Equipment810Materials and Equipment.9811Qualification of Materials and Equipment.9812Materials for Use in Cold Climates.10813Marking10814Material Specifications.10815Equipment Specifications.a s.aaa.a e.aa.a.s aa.a.a11816Transportation of Line Pipe11817Conditions for the Reuse of Pipe11ChapterWelding820Welding15821General15822Preparation for Welding.15823Qualification of Procedures and Welders16824Preheating16825Stress Relieving.16826Welding and Inspection Tests.17827Repair or Removal of Defective Welds in Piping Intended to Operate at 20%or More of the Specified Minimum Yield Strength.18Chapter IIIPiping System Components and Fabrication Details830Piping System Components and Fabrication Details.19831Piping System Components.19832Expansion and Flexibility.6833Combined Stress Calculations.27834Supports and Anchorage for Exposed Piping.2835Anchorage for Buried Piping28Tables831.42Reinforcement of Welded Branch Connections,Special Requirements24832.2Thermal Expansion of Piping Materials.26i讯A00Chapter IVDesign,Installation,and Testing840Design,Installation,and Testing29841Steel Pipe31842Other Materials41843Compressor Stations.49844Pipe-Type and Bottle-Type Holders.52845Control and Limiting of Gas Pressure.53846Valves，。，。g,。g,。,。,。,。g,。,。,。,。gt,。61847Vaultsgg。g。eg。gg。0。g。ggg5g4.040ggt0”62848CustomersMeters and Regulators63849Gas Service Lines.,.64Tables841.114ABasic Design Factor,F.33841.114BDesign Factors for Steel Pipe Construction34841.115ALongitudinal Joint Factor,E.35841.116ATemperature Derating Factor,T,for Steel Pipe.35841.322(fDTest Requirements for Pipelines and Mains to Operate at Hoop Stresses of30%or More of the Specified Minimum Yield Strength of the Pipe。44”40841.33Maximum Hoop Stress Permissible During Test.40842.214Standard Thickness Selection Table for Ductile Iron Pipe.42842.32(c)Wall Thickness and Standard Dimension Ratio for Thermoplastic Pipe44842.33(c)Diameter and Wall Thickness for Reinforced Thermosetting Plastic Pipe.44842.396(c)Nominal Values for Coefficients of Thermal Expansion of Thermoplastic PipeMaterials46Chapter VOperating and Maintenance Procedures850Operating and Maintenance Procedures Affecting the Safety of GasTransmission and Distribution Facilities.69851Pipeline Maintenance.71852Distribution Piping Maintenance.74.1853Miscellaneous Facilities Maintenance.77854Location Class and Changes in Number of Buildings Intended for HumanOccupancy80855Concentrations of People in Location Classes 1 and 2.81856Pipeline Service Conversions.82Table854.1(c)Location Class81Chapter VICorrosion Control860Corrosion Control85861Scope85862External Corrosion Control85863Internal Corrosion Control.89864Pipelines in Arctic Environments.90865Pipelines in High Temperature Service.92866Stress Corrosion and Other Phenomena.92867Records92Chapter VIIMiscellaneous870Miscellaneous938710 dorizati0n93872Liquefied Petroleum Gas(LPG)Systems93873Pipelines on Private Rights-of-Way of Electric Transmission Lines.94A00