1、AN AMERICAN NATIONAL STANDARDASME B16.12-2009Revision of ASME B16.12-1998 (R2006)Cast Iron Threaded Drainage FittingsIntentionally left blankASME B16.12-2009Revision of ASME B16.12-1998 (R2006)Cast IronThreadedDrainageFittingsAN AMERICAN NATIONAL STANDARDDate of Issuance: August 14, 2009The next edi
2、tion of this Standard is scheduled for publication in 2014. There will be no addendaissued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Interpretations are published on the ASME Web site under the Committee Pages athttp:/cs
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8、stablishedASME 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 Engine
9、ersThree Park Avenue, New York, NY 10016-5990Copyright 2009 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . viCorrespondence With the B16 Committee vii1 Scope and General. 12 Size. 13 Marking . 24 Materials 25 Dimensions and Tol
10、erances . 26 Threading . 27 Ribs 38 Coatings 39 Face Bevel. 3Figures1 Identification of Reducing Fittings 22 Types of Fittings Tapped to Provide 21 mm/m (0.25 in./ft) Pitch . 12Tables1 Inspection Limits for Diameter and Width of Band 12 Inspection Limits for Center-to-End Dimensions . 13 Wall Thickn
11、ess and Threaded End Dimensions 44 Center-to-End Dimensions of Elbows 55 Dimensions of Tees, Crosses, and Y-Branches 66 Dimensions of Y-Branches (Reducing Sizes) . 77 Dimensions of 45-deg Y-Branches . 88 Dimensions of 45-deg Y-Branches (Reducing Sizes) 89 Dimensions of Couplings . 910 Dimensions of
12、Increasers . 911 Dimensions of Offsets 912 Dimensions of Tucker Connections, Roof Connections, and Tucker Y-Branches 1013 Dimensions of P-Traps, Bath P-Traps, and Running Traps 11Mandatory AppendicesI References 13II Dimensions of Fittings in U.S. Customary Units . 14Nonmandatory AppendicesA Quality
13、 System Program 23B Dimensions of Welded and Seamless Steel Pipe (ASME B36.10M) 24iiiFOREWORDScrew joint drainage fittings were developed in about 1880 by the Durham House DrainageCompany of New York and are often referred to as Durham fittings. At that time, soil pipes anddrains in New York had bee
14、n required to be of plumbers cast iron soil pipe, whereas Chicagossoil pipes were required to be of lead or plumbers cast iron pipe.To form a continuous passageway with no pockets or obstructions where foreign matter couldcollect and gradually accumulate, it was necessary to design a special type of
15、 screw fitting. Insidediameters of the fittings are about the nominal size of standard weight wrought steel pipe(Schedule 40). The thread chamber is designed so that when the pipe is tightly screwed into thefitting, its end nearly abuts the shoulder of the fitting, thereby making a practically conti
16、nuouspassage. The threading of these fittings required special care, and the threads on the pipe werecut to suit the threads in the fitting.With the passage of time, manufacturers practices began to diverge in regard to center-to-enddimensions and other features. The Manufacturers Standardization So
17、ciety of the Valve andFittings Industry (MSS) studied the situation, developed a standard practice for these fittings,and published MSS SP-8, Cast Iron Drainage Fittings, in 1929. Subsequently, for better coordinationwith other screwed fitting standards under the jurisdiction of the B16 Sectional Co
18、mmittee ofthe American Standards Association (ASA), the subject was assigned to Subcommittee 2 of B16.Many drafts of the proposed standard were developed, and printers proofs were distributedto industry for criticism and comment in May 1940. A revised proposal dated July 1941 wassubmitted to the mem
19、bers of the Sectional Committee for letter ballot vote. Following its approvalby that body, it was submitted to the sponsors and to ASA with recommendations for approval asan American Standard. This was granted in February 1942, with the designation ASA B16.12-1942.The MSS Ferrous Screw Fittings Com
20、mittee made a thorough study of the 1942 Standard andrecommended that several changes be made to bring the data in line with current productionand usage of this type of fitting. To comply with the recommendations, Subcommittee 2 of theB16 Sectional Committee revised portions of the text and illustra
21、tions and added dimensionaltables for Tucker connections, roof connections, and Tucker Y-branches, as well as dimensionsfor P-traps, bath traps, and running traps.A draft, dated September 1952, was presented to the Sectional Committee for letter ballot vote.After the committee and other sponsor orga
22、nizations approved the draft, it was presented toASA, and approval of ASA B16.12-1953 was granted on September 11, 1953.Subcommittee 2 reviewed the document from 1963 to 1964. The Sectional Committee approvedseveral minor changes in format and wording, changing the title to Cast Iron Threaded Draina
23、geFittings. ASA B16.12-1965 was approved on November 12, 1965.In 1970, further review was initiated by Subcommittee 2, now an American National StandardsInstitute (ANSI) Committee, and ANSI B16.12-1971 was granted approval on November 1, 1971.The Standard was updated, and metric (SI) dimensions were
24、 added in ANSI B16.12-1977,approved on February 4, 1977.In 1982, American Standards Committee B16 was reorganized as the ASME B16 StandardsCommittee under procedures accredited by ANSI. Also in 1982, Subcommittee B (formerly 2)updated reference standards, and the revision was approved on July 20, 19
25、83 as ANSI B16.12-1983.In the 1991 edition of ASME B16.12, reference standards were updated, and the metric dimen-sions were deleted. The edition was approved by ASME and by ANSI on January 4, 1991.In the 1998 edition of ASME B16.12, reference standards were updated, a quality systemprogram annex wa
26、s added, and several editorial revisions were made. Following approval byASME B16 Subcommittee B and the B16 Main Committee, ANSI approved this American NationalStandard on November 20, 1998.Work started during 1999 to revise the Standard to include metric units as the primary referenceunits while m
27、aintaining U.S. Customary units in either parenthetical or separate forms.ivIn this edition, metric dimensions have become the primary units and inch dimensions areincorporated into this Standard as secondary units and shown in parentheses. The added inchdimensions constitute an independent but equa
28、l standard to the metric units.Following approval by the Standards Committee and the ASME Board, this revision to the1998 edition of this Standard was approved as an American National Standard by ANSI onApril 6, 2009, and designated as ASME B16.12-2009.vASME B16 COMMITTEEStandardization of Valves, F
29、langes, Fittings, Gaskets, andValve Actuators(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSW. B. Bedesem, ChairM. L. Nayyar, Vice ChairU. DUrso, SecretarySTANDARDS COMMITTEE PERSONNELR. W. Barnes, Anric Enterprises, Inc.W. B. Bede
30、sem, Consultant, ExxonMobil Research however, they shouldnot contain proprietary names or information.Requests that are not in this format may be rewritten in the appropriate format by the Committeeprior to being answered, which may inadvertently change the intent of the original request.ASME proced
31、ures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse”
32、 any item, construction, proprietary device, or activity.Attending Committee Meetings. The B16 Standards Committee regularly holds meetings, whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B16 Standards Committee.viiIntentionally left blankASME B
33、16.12-2009CAST IRON THREADED DRAINAGE FITTINGS1 SCOPE AND GENERAL1.1 ScopeThis Standard for cast iron threaded drainage fittingscovers(a) sizes and method of designating openings inreducing fittings(b) marking(c) material(d) dimensions and tolerances(e) threading(f) ribs(g) coatings(h) face bevel1.2
34、 ApplicabilityThis Standard covers fittings intended for use in grav-ity drainage systems subject only to the gravity head ofwaste liquids at temperatures from ambient to approxi-mately 100C (212F). The use of this Standard for pres-surized waste handling systems is the responsibility ofthe user and
35、 is subject to the requirements of any applica-ble code.1.3 Quality SystemsRequirements relating to the product manufacturersQuality System Programs are described inNonmandatory Appendix A.1.4 ReferencesStandards and specifications adopted by reference inthis Standard are shown in Mandatory Appendix
36、 I,which is part of this Standard. It is not considered practi-cal to identify the specific edition of each referencedstandard and specification in the text, when referenced.Instead, the specific editions of the referenced standardsand specifications are listed in Mandatory Appendix I.2 SIZE2.1 Nomi
37、nal Pipe SizeThe size of the fittings scheduled in Tables 1 and 2 isidentified by the corresponding nominal pipe size. Forreducing tees, Y-branches, or crosses, the largest runopening shall be given first. The straight-line sketches(Fig. 1) illustrate how the reducing fittings are read.2.2 Denotatio
38、nNPS, followed by a dimensionless number, is the des-ignation for nominal fitting size. NPS is related to the1Table 1 Inspection Limits for Diameter and Widthof BandDiameter and WidthNPS of Band, Minus, mm1141.01121.02 1.02121.33 1.34 1.65 1.66 1.88 2.3Table 2 Inspection Limits for Center-to-EndDime
39、nsionsCenter-to-End,NPS Plus or Minus, mm1141.81122.02 2.02122.53 2.54 3.05 3.06 3.68 4.1GENERAL NOTE: The above limits apply to all fittings covered bythis Standard. Inspection limits for end-to-end dimensions shall bedouble the limits for center-to-end dimensions. The largest openingin the fitting
40、 governs the tolerance to be applied to all openings.reference nominal diameter, DN, used in internationalstandards. The relationship is, typically, as follows:NPS DN12511432112402502126538312.4 100GENERAL NOTE: For NPS r 4, the related DN r 25 H11547 (NPS).ASME B16.12-2009Fig. 1 Identification of R
41、educing Fittings442244224 2 Single and DoubleShort 90-deg Y-BranchLong 90-deg Y-Branch4 2 Single and Double45-deg Y-Branch3 MARKINGEach fitting shall be marked with the manufacturersname or trademark in accordance with the requirementsof MSS Standard Practice No. SP-25.4 MATERIALS4.1 CastingsThe dim
42、ensions prescribed in this Standard (Tables 3through 13) are based on gray iron castings of highquality produced under regular control of chemical andphysical properties by a recognized process. The manu-facturer shall be prepared to certify that the product hasbeen so produced and that its chemical
43、 and physicalproperties, as proved by test specimens, are equal to therequirements specified in ASTM A 126, Specification forGray Iron Castings for Valves, Flanges, and Pipe Fittings.4.2 Optional MaterialDrainage fittings are regularly made of cast iron. Atthe option of the manufacturer, drainage fi
44、ttings maybe furnished of malleable iron complying with the mini-mum physical requirements of ASTM A 197,Specification for Cupola Malleable Iron.5 DIMENSIONS AND TOLERANCES5.1 DimensionsDimensions in SI (metric) units are given in Tables 3through 13 for various types of fittings. Those dimen-sions a
45、re the standard. Corresponding U.S. Customaryvalues are given in Tables II-3 through II-13 inMandatory Appendix II. Some dimensions of steel pipefrom ASME B36.10M are listed for convenience inNonmandatory Appendix B in inches only. Tolerancesapplicable to dimensions of fittings are specified inparas
46、. 5.2 through 5.6.25.2 Metal ThicknessAt no point in the castings shall the metal thicknessbe less than 90% of the values listed in Table 3.5.3 Thread ChamberThe length of thread and total length of thread cham-ber to shoulder shall not vary from the dimensionsshown in the tables by more than plus o
47、r minus theequivalent of the pitch of one thread.5.4 Outside Diameter and Width of BandThe minus tolerances given in Table 1 are permittedon inspection to apply to the diameter of the band andthe width of the band.5.5 Inside Diameter of FittingThe inside diameter shall not vary from dimensionsshown
48、by more than the following:(a) for sizes 112b NPS b 4, inclusive 0.8 mm (0.03 in.)(b) for sizes 5 b NPS b 8, inclusive 1.6 mm (0.06 in.)5.6 Center-to-EndThe center-to-end dimensions shall not vary from thegiven dimensions by more than the values given inTable 2.5.7 ShoulderThese fittings are provide
49、d with shoulders so thatwhen used with Standard Wall Pipe (ASME B36.10M),the end of the pipe practically meets the shoulder as thejoint is made up, thereby forming a smooth passageway.6 THREADING(a) All fittings (except roof connections) shall bethreaded with American National Standard Taper PipeThreads (ASME B1.20.1), and the variations in threadingshall be limited to one turn small and no turn large.Threaded openings without shoulder, however, shall belimited to one turn large and one turn small from thegaging notch on the plug when using working gages
