1、Designation: C 1541 08Standard Specification forShielded Transition Couplings Using Flexible Poly VinylChloride (PVC) Gaskets to Connect Dissimilar DWV Pipeand Fittings1This standard is issued under the fixed designation C 1541; the number immediately following the designation indicates the year ofo
2、riginal 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. Scope1.1 This specification covers the performance of shieldedtransit
3、ion couplings using flexible PVC gaskets to join dissimi-lar DWV pipe and fittings above and below ground up to andincluding 10-in. pipe and fittings.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that
4、are provided for information onlyand are not considered standard.1.3 The committee with jurisdiction over this standard is notaware of any comparable standards of any other organization.1.4 The following precaution pertains only to the testmethod portion, Sections 7 and 8 of this specification. This
5、standard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory require-ments prior to use.2. Referenced Documents2.
6、1 ASTM Standards:2A 493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold ForgingA 644 Terminology Relating to Iron CastingsD 5926 Specification for Poly (Vinyl Chloride) (PVC) Gas-kets for Drain, Waste, and Vent (DWV), Sewer, Sanitary,and Storm Plumbing Systems3. Termino
7、logy3.1 Definitions:3.1.1 Definitions of the following terms used in this speci-fication are found in Terminology C 717.3.2 Definitions of Terms Specific to This Standard:3.2.1 center stop, nan integral part of the gasket centeredon the axial length of the gasket intended to limit the insertiondepth
8、 of the pipe to be coupled.3.2.2 clamp assembly, nthat portion of the couplingexcluding the gasket.3.2.3 coupling, nthe complete assembly.3.2.4 dissimilar DWV pipe and fittings, n pipe and fittingsmade of different materials or different outside diameters, orboth.3.2.5 fitting, nparts of a pipeline
9、other than straight pipes,valves, or couplings.3.2.6 gasket, nthe elastomeric portion of the coupling.3.2.7 joint, nthe point of assembly consisting of thecoupling and the joined pipes or fittings, or both.3.2.8 shield, nan external metallic protective device de-signed to protect the sealing gasket
10、from external elements thatcould cause failure of the sealing assembly.4. Materials and Manufacture4.1 Physical properties of Flexible PVC (Poly Vinyl Chlo-ride) gaskets shall comply with Specification D 5926. Thegaskets shall be permitted to be spliced or molded.4.2 All steel parts shall be 300 ser
11、ies stainless steel meetingthe requirements of Specification A 493 excluding copperbearing alloys.5. Requirements5.1 Couplings shall be supported with suitable hangers orsupport necessary to support the pipe, fitting, and contents. Thesupport must be located within 18 in. of the center of thecouplin
12、g.1This specification is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.75 on Gaskets andCoupling for Plumbing and Sewer Piping.Current edition approved Oct. 1, 2008. Published November 2008. Originallyapproved in 2002. Last previous
13、 edition approved in 2004 as C 1541 - 04.2For 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 website.TABLE 1 Unrestrained
14、 Hydrostatic Joint TestPipe Size Test Pressure112 to 5 in. (38 to 76 mm) 20 psi (138 kPa)6 in. (152.4 mm) 18 psi (124 kPa)8 in. (203.2 mm) 10 psi (69 kPa)10 in. (254 mm) 6 psi (41.4 kPa)1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States
15、.5.2 The coupling shall not be installed in a location wherethe expected internal or external temperatures are below -30F(-34C) or exceed 130F (54C).5.3 Couplings shall not be installed in construction that hasa fire rating that restricts the use of flammable materialsthrough penetrations or plenums
16、 without additional fire-resistive protection.6. Elastomeric Gasket Requirements6.1 The elastomeric gasket shall consist of one piece con-forming to the physical requirements of 4.1.6.2 The elastomeric gasket shall have an inside centerstop-ring spaced an equal distance from the ends to serve as ast
17、op between the pipe/fitting ends. The center stop ring shallnot create an enlargement chamber or recess with a ledge,shoulder or reduction of pipe area or offer an obstruction toflow. A gasket without an inside center stop shall be permittedin tubular transition applications.6.3 The elastomeric gask
18、et shall be free from imperfectionsand porosity that affects its use and serviceability.7. Clamp Assembly Requirements7.1 Stainless steel tension bands shall be tested to withstand125 % of the manufacturers installation torque or a minimumof 60 in.-lbf of applied torque whichever is greater withoutv
19、isible signs of failure. The band shall be tested over a steelmandrel of the appropriate coupling diameter and torque asrequired.7.2 Clamp assembly screws or bolts shall not have screw-driver slots.8. Coupling Requirements and Test Methods8.1 Assemble each coupling tested in accordance with themanuf
20、acturers instructions between two sections of randomlyselected pipe manufactured to appropriate standards for thetype of pipe the couplings are expected to join. The pipesection will not exceed a length of 20 ft (6.1 m). Conduct thefollowing tests:8.2 Deflection TestEach coupling tested shall be mou
21、ntedbetween two pieces of pipe as provided in 8.1. The out boundends of the pipe shall be closed with test plugs. The assemblyshall be filled with water, all air expelled, and hydrostaticallypressurized to 4.3 psi (29.6 kPa) for the duration of the test.One pipe shall be rigidly supported and while
22、the assembly isunder pressure, the opposite end of the other pipe shall beraised12 in. (12.7 mm) per linear foot of pipe. The pressureshall be maintained for 15 min and leakage shall not bepermitted. A test apparatus such as the one shown in Fig. 1 issuggested.8.3 Shear TestThe assembly shall be fil
23、led with water, allair expelled, and hydrostatically pressurized to 4.3 psi (29.6kPa) for the duration of the test. Two joined lengths of pipeselected as provided in 8.1 shall be supported on blocks at threelocations. One length shall be supported on two blocks, onenear the uncoupled end and the oth
24、er immediately adjacent tothe coupling. This length shall be firmly restrained in position(refer to Fig. 2). The other coupled length shall be supported bya single block 6 in. from (152.4 mm) the end of the pipe.Aloadof 50 lb (22.7 kg) per inch of nominal diameter shall be appliedat a point 6 in. (1
25、52.4 mm) from the edge of the coupling upona 12 in. (304.8 mm) length of 3 by 3 (76.2 by 76.2 mm) angleiron or load distributing pad located on the top of the pipeimmediately adjacent to the coupling of the pipe having onesupport only. When testing reducing couplings the load shall beapplied to the
26、reduced size. Under this loading there shall be novisible leakage or displacement of more than38 in. (9.5 mm)from true alignment when an internal pressure equivalent to aFIG. 1 Deflection TestFIG. 2 Shear Testing ApparatusC154108210 ft (3 m) head of water 4.3 psi (29.6 kPa) is applied. The loadand i
27、nternal pressure shall be maintained for 15 min andleakage shall not be permitted.8.4 Unrestrained Hydrostatic Joint Test:8.4.1 Each coupling tested shall be assembled in accordancewith the manufacturers instructions between two sections ofmachined steel pipe and conduct the unrestrained hydrostatic
28、joint test.8.4.2 The plain ends of the pipe to be used shall bemachined to the correct nominal outside diameter of the typesof pipe for which the coupling is intended to join. Plain endsshall have 0.015 in. (2 mm) deep grooves machined circum-ferentially around them at 0.125 in. (3.2 mm) intervals d
29、ownthe pipe section for a distance equal to that covered by theelastomeric sleeve. The tool used to machine the grooves shallhave a 60 included angle and shall cut into the pipe from aperpendicular position. The surface between the grooves shallbe a lathe turned surface of 125 RMS. The plain ends of
30、 thepipe are to be uncoated and shall be cleaned with acetone andthoroughly dried before each assembly.8.4.3 Fill the pipe assembly with water, expelling all air andincrease the hydrostatic pressure at a rate of 1 psi (6.9 kPa)every 30 s to the target test pressure shown in Table 1. Whenthe target p
31、ressure is reached, it shall be held for 10 min. Anyleakage or axial joint movement of more than 0.150 in. (3.8mm) shall mean failure.8.4.4 The pipe assemblies are to be supported in a mannerthat does not restrain joint movement as shown in Fig. 3.9. Markings and Identification9.1 Each gasket shall
32、be permanently marked with themanufacturers name or US registered trademark, country oforigin, pipe size for which it is designed, and the designationSpecification D 5926.9.2 Each coupling shall be labeled as to the size(s), mate-rial(s), class for which it is intended, operating temperaturerange, a
33、nd the designation ASTM showing compliance to thisstandard. The marking shall be visible after installation.C1541083FIG. 3 Unrestrained Hydrostatic Joint Testing ApparatusC1541084ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item me
34、ntionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committe
35、e and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeti
36、ng of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO
37、 Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C1541085
