1、Designation: D4161 14 An American National StandardStandard Specification for“Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin)Pipe Joints Using Flexible Elastomeric Seals1This standard is issued under the fixed designation D4161; the number immediately following the designation indicates the
2、 year oforiginal adoption 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 axially unrestrained bel
3、l-and-spigot gasket joints including couplings required for machine-made “fiberglass” (glass-fiber-reinforced thermosetting-resin)pipe systems, 8 in. (200 mm) through 156 in. (4000 mm), usingflexible elastomeric seals to obtain soundness. The pipe sys-tems may be pressure (typically up to 250 psi) o
4、r nonpressuresystems for water or for chemicals or gases that are notdeleterious to the materials specified in this specification. Thisspecification covers materials, dimensions, test requirements,and methods of test.1.2 The values stated in inch-pound units are to be regardedas the standard. The va
5、lues given in parentheses are providedfor information purposes only.NOTE 1There is a similar but technically different ISO Standard (ISO8639).1.3 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
6、 to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsF412 Terminology Relating to Plas
7、tic Piping SystemsF477 Specification for Elastomeric Seals (Gaskets) for Join-ing Plastic Pipe3. Terminology3.1 Definitions:3.1.1 GeneralDefinitions and abbreviations are in accor-dance with Terminology D883 or Terminology F412, andTerminology D1600 unless otherwise indicated.4. Types of Joints4.1 T
8、his specification covers two types of axially unre-strained joints based on effecting soundness of the jointthrough compression of an elastomeric seal or ring:4.1.1 Bell-and-spigot or coupling joint with the gasketplaced in the bell in circumferential compression. An elasto-meric gasket joint design
9、 featuring a continuous elastomericring gasket placed in an annular space provided in the bell orsocket of the pipe or fitting. The spigot end of the pipe or fittingis forced into the bell, thereby compressing the gasket radiallyto form a positive seal.4.1.2 Bell-and-spigot or coupling joint with th
10、e gasketplaced on the spigot in circumferential tension:Apush on jointdesign featuring a continuous elastomeric ring gasket placed inan annular space provided on the spigot end of the pipe orfitting. The spigot is forced into the bell of the pipe or fitting,thereby compressing the gasket radially to
11、 form a positive seal.NOTE 2A coupling joint of these types is a loose double-bell sleeveused to connect pipes which have spigots at both ends (see Fig. 1). Allreferences to bells in this specification are applicable to the sleevecoupling as well as to the integral bell of a bell-and-spigot gasket j
12、oint.5. Materials and Manufacture5.1 The gasket shall be a continuous elastomeric ring ofcircular or other geometric cross section and shall meet therequirements of Specification F477, unless otherwise specifiedin this specification. When a splice is used in the manufactureof the gasket, no more tha
13、n two splices shall be made in anyone gasket.5.1.1 The chemical composition of the gasket shall becompatible with the type of environment to which it will besubjected. Selection of the gasket composition shall be inaccordance with a purchaser and seller agreement.NOTE 3Consult the gasket manufacture
14、r for advice as to the suitabil-ity of specific rubber compounds for the intended service and jointconfigurations. Items such as cold set when the joint is deflected underlow-temperature conditions and maximum and minimum stretch in thegasket may be dependent upon the specific chemical compounds use
15、d.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.23 on ReinforcedPlastic Piping Systems and Chemical Equipment.Current edition approved April 1, 2014. Published April 2014. Originallyapproved in 1982. Last previous
16、edition approved in 2010 as D4161 01(2010).DOI: 10.1520/D4161-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM webs
17、ite.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 Materials in the bell and spigot of the joint shall meetthe requirements of the applicable ASTM specification for
18、 thepipe or fitting of which the joint is a part.6. Requirements6.1 Joint SurfacesAll surfaces of the joint upon or againstwhich the gasket may bear shall be smooth and free of cracks,fractures, or other imperfections that would adversely affect theperformance of the joint.6.2 Joint GeometryThe desi
19、gn of the joint shall include ameans to retain the gasket and prevent it from being uninten-tionally displaced, either during assembly of the joint or duringoperation of the completed pipe system.6.3 Dimensions and TolerancesThe provisions of 6.3.1.1apply only to a joining system utilizing a gasket
20、of circularcross section retained in a rectangular groove. Manufacturersmay submit to the purchaser detailed designs for joints utilizinggaskets or grooves, or both, of other geometric shape or forjoints not meeting the criteria of 6.3.1. Joints not meeting therequirements of this section shall meet
21、 the test requirements ofSection 7; such joints shall be acceptable, provided the designis approved by the purchaser prior to manufacture and providedthe test pipe complies with the specified test requirements. Testresults may be extended to other diameters with the same jointconfiguration, gasket s
22、hape and gasket composition providedsubstantially similar gasket compressions and gasket hardnessare maintained. Gasket dimensions may be increased or de-creased provided joint geometry is also appropriately propor-tioned so that critical relationships like gasket confinement areequal or superior to
23、 the tested joint. Design submissions shallinclude joint geometry, tolerances, gasket characteristics, pro-posed plant tests, and such other information as required by thepurchaser to evaluate the joint design for field performance.6.3.1 Joints Using Circular Gasket Cross Sections:6.3.1.1 The volume
24、 of the annular space provided for thegasket, with the engaged joint at normal joint closure inconcentric position, and neglecting ellipticity of the bell andspigot, shall not be less than the design volume of the gasketfurnished. For a rectangular gasket groove, the cross-sectionalarea of annular s
25、pace shall be calculated for minimum bellinside diameter, maximum spigot outside diameter, minimumwidth of groove at surface of spigot, and minimum depth ofgroove. The volume of the annular space shall be calculated atthe centerline of the groove and considering the centroid of thecross-sectional ar
26、ea to be at the midpoint between the surfaceof the groove on which the gasket is seated and the surface ofthe bell, if the groove is on the spigot, or the surface of thespigot, if the groove is in the bell.6.3.1.2 When the design volume of the gasket is less than75 % of the volume of the annular spa
27、ce in which the gasket isconfined, the dimensions and tolerances of the gasket, bell, andspigot shall be such that, when the outer surface of the spigotand the inner surface of the bell come into contact at somepoint in their periphery, the deformation in the gasket shall notexceed 40 % at the point
28、 of contact nor be less than 15 % at anypoint. If the design volume of the gasket is 75 % or more of thevolume of the annular space, the deformation of the gasket, asprescribed above, shall not exceed 50 % nor be less than 15 %.The cross-sectional area of annular space shall be calculatedfor average
29、 bell diameter, average spigot diameter, averagewidth of groove at surface of spigot, and average depth ofgroove. The volume of the annular space shall be calculated atthe centerline of the groove and considering the centroid of thecross-sectional area to be at the midpoint between the surfaceof the
30、 groove on which the gasket is seated and the surface ofthe bell, if the groove is on the spigot, or the surface of thespigot, if the groove is in the bell.NOTE 4It is recognized that a relationship exists between thewater-tightness of a joint, the gasket deformation, and the ratio of gasketvolume t
31、o space volume. For high-pressure applications, it may benecessary to provide a very high-volume ratio to obtain a sound joint.Some manufacturers also have developed satisfactory joints with verylittle gasket deformation, but meet the requirements of Section 6 byutilizing a very high-volume ratio.6.
32、3.1.3 When determining the maximum percent deforma-tion of the gasket, the minimum depth of groove and thestretched gasket diameter shall be used and calculations madeat the centerline of the groove. When determining the mini-mum percent deformation of the gasket, the maximum belldiameter, the minim
33、um spigot diameter, the maximum depth ofgroove, and the stretched gasket diameter shall be used andcalculations made at the centerline of the groove. For gasketdeformation calculations, if the gasket is placed on the spigotin circumferential tension, the stretched gasket diameter shallbe determined
34、as being the design diameter of the gasketdivided by the square root of (1 + x) where x equals the designpercent of gasket stretch divided by 100. If the gasket is placedin the bell in circumferential compression, the design diameterof the gasket shall be used.6.3.1.4 The taper on all sealing surfac
35、es of the bell andspigot on which the elastomeric gasket may bear after closureof the joint and at any degree of partial closure, except withinthe gasket groove, shall form an angle of not more than 2 withthe longitudinal axis of the pipe. If the joint design does notincorporate a mechanical locking
36、 feature, the joint shall bedesigned and manufactured in such a way that at the positionof normal joint closure, the parallel surfaces upon which thegasket may bear after closure will extend not less than 0.75 in.(20 mm) away from the edges of the gasket groove.FIG. 1 Typical Coupling Joint DetailD4
37、161 1426.3.1.5 Circular Gaskets:(1) In a joint in which the gasket is placed in the bell incircumferential compression, the circumferential length of thegasket shall be such that, when inserted into the gasket groove,the amount of circumferential compression will be less than4 %. In larger pipe diam
38、eters, an adhesive may be required tohold the gasket in place prior to installation.(2) In an elastomeric joint in which the gasket is placed onthe spigot in circumferential tension, the circumferential lengthof the gasket shall be such that, when installed in the gasketgroove, the amount of stretch
39、 shall not exceed 30 %.(3) Compute the amount of compression or stretch bycomparing the circumferential length of the centroid of therelaxed gasket with the circumferential length of the centroidof the compressed or stretched gasket after installation in thebell or on the spigot.(4) Each gasket shal
40、l be manufactured to provide thevolume of elastomer required by the pipe manufacturers jointdesign, with a tolerance of 61 % for gaskets of 1.0-in.(25-mm) diameter and larger. The allowable percentage toler-ance shall vary linearly between 63 % and 61 % for gasketdiameters between 0.5 and 1.0 in. (1
41、3 and 25 mm).6.3.2 The tolerances permitted in the construction of thejoint shall be those stated in the pipe manufacturers design asapproved.6.3.3 DrawingsThe manufacturer shall furnish drawingsof the joint and gasket, including dimensions and tolerances, ifrequested by the purchaser.7. Laboratory
42、Performance Requirements7.1 General:7.1.1 The gasket shall be the sole element depended upon tomake the joint leakproof. The assembled joints shall pass theperformance tests listed in this section. The tests shall beperformed with components selected to provide minimumcompression in the gasket. The
43、internal hydrostatic pressuresrequired in 7.2 and 7.3 shall be two times the rated pressure, ifthe pipe is manufactured for pressure service, or 29 psi (200kPa), if the pipe is manufactured for nonpressure service.7.1.2 Laboratory hydrostatic pressure tests on joints shall bemade on an assembly of t
44、wo sections of pipe properlyconnected in accordance with the joint design. Suitable bulk-heads may be provided within the pipe adjacent to and oneither side of the joint, or the outer ends of the two jointed pipesections may be bulkheaded. Restraints may be provided at thejoint to resist transverse
45、thrust. No coatings, fillings, orpackings shall be placed prior to the hydrostatic tests.7.2 Pipes in Angularly Deflected PositionUsing a pipeand joint system as described in 7.1.2, the test sections shall bedeflected angularly, as shown in Fig. 2, and subjected to theappropriate internal hydrostati
46、c test pressure for 10 min with-out leakage. The angle defined by the joint openings given inFig. 2 is the angle between the axis of the two joined pipes.7.2.1 Joints intended for use of pressures greater than 250psi may have lower allowable angular deflections than thosegiven in Fig. 2 by manufactu
47、rer purchaser agreement. Thejoints shall be tested at the manufacturers maximum allowedangular deflection.7.2.2 Determine the joint opening by scribing a circumfer-ential index mark on the outside of the pipe a sufficient distancefrom the spigot end to be visible when the pipe is joined.Measure the
48、maximum and minimum distance from the end ofthe bell to the mark. The difference equals the joint opening.Fig. 2 illustrates a typical joint in closed and deflected positionsand the index mark.NOTE 5This test is a laboratory performance test of joint integrity andis not indicative of allowable angul
49、ar deflections in field installations. Inactual installations, deflections greater than the manufacturers recom-mended maximum should be avoided, and elbows, bends, or specialfittings should be used in such cases.7.3 Pipes in Laterally Offset Position (Shear Loading)Using a pipe and joint system as described in 7.1.2, the testsections shall be deflected while the pipe units are in ahorizontal position, as shown in Fig. 3, by applying a perpen-dicular load. The load shall be 100 lb/in. (17.5 kN/m) indiameter.The load shall be uniformly applied over an arc of notmore t
