1、Designation:F194812Standard Specification forMetallic Mechanical Fittings for Use on Outside DiameterControlled Thermoplastic Gas Distribution Pipe and Tubing1This standard is issued under the fixed designation F1948;the number immediately following the designation indicates the year oforiginal adop
2、tion or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers requirements and test methodsfor the qualification o
3、f metallic mechanical fittings for use withoutside diameter controlled thermoplastic gas distribution pipeand tubing as specified in Specification D2513.1.2 The test methods described are not intended to beroutine quality control tests.1.3 This specification covers the types of mechanical fittingsde
4、scribed in 3.3.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 The following safety hazards caveat pertains only to thetest method
5、 portion,Section 7,of this specification.Thisstandard may involve hazardous material,operations andequipment.This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and he
6、alth practices and determine the applica-bility of regulatory limitations prior to use.1.6 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures),shall not be consideredas requirements of the standar
7、d.2.Referenced Documents2.1 ASTM Standards:2D638 Test Method for Tensile Properties of PlasticsD1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2513 Specification for Thermoplastic Gas Pressure Pipe,Tubi
8、ng,and FittingsF412 Terminology Relating to Plastic Piping SystemsF1588 Test Method for Constant Tensile Load Joint Test(CTLJT)F2897 Specification for Tracking and Traceability EncodingSystem of Natural Gas Distribution Components(Pipe,Tubing,Fittings,Valves,and Appurtenances)2.2 ASME Standard:ASME
9、B 31.8 Gas Transmission and Distribution PipingSystems32.3 Federal Specification:OPS Part 192 Title 49,Code of Federal Regulations42.4 Other Document:PPI TR-4 Recommended Hydrostatic Strengths and DesignStresses for Thermoplastic Pipe and Fitting Compounds53.Terminology3.1 Definitions are in accorda
10、nce with Definitions F412unless otherwise specified.Abbreviations are in accordancewith Abbreviations D1600 unless otherwise specified.3.1.1 The gas industry terminology used in this specificationis in accordance with ASME/ANSI B31.8 or United StatesCFR 49 Part 192 unless otherwise indicated.3.1.2 T
11、he term“pipe”used herein refers to both pipe andtubing unless specifically stated otherwise.The term“fitting”refers to a mechanical connecting device as described in 3.2.5and 3.2.7.3.2 Definitions:3.2.1 Category 1 mechanical fitting,nfitting for assem-bling pipe,which includes a compression zone(s)t
12、o providefor pressure integrity,leak tightness,and resistance to endloads sufficient to cause no less than 25%elongation of thepiping,as described in this standard.1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems,and is the direct responsibility of Subcomm
13、ittee F17.60 on Gas.Current edition approved April 1,2012.Published May 2012.Originallypublished in 1999.Last previous edition approved in 2011 as F194805(2011).DOI:10.1520/F1948-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.
14、For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.4Available from the Office of Pi
15、peline Safety,Research and Special ProgramsAdministration,U.S.Department of Transportation,400 Seventh Street,S.W.,Washington,DC,20006-1301.5Available from Plastics Pipe Institute(PPI),105 Decker Court,Suite 825,Irving,TX 75062,http:/www.plasticpipe.org.*A Summary of Changes section appears at the e
16、nd of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.2 Category 2 mechanical fitting,nfitting for assem-bling pipe,which includes a compression zone(s)to providefor pressure integrity and leak tightness;Category 2 fittings donot provide for resistance to end loads.3.2.3 Category 3 mechanical fitting,nfitting for assem-bling pipe,which includes a compression zone(s)for pressureintegrity,leak tightness,and resistance t
