1、AN AMERICAN NATIONAL STANDARDSiphonicRoof DrainsASME A112.6.9-2005Intentionally left blank ASME A112.6.9-2005Siphonic RoofDrainsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016Date of Issuance: September 30, 2005The next edition of this Standard is scheduled for publication in 2010.
2、 There will be no addendaissued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. The interpretations are not part of the Standard.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or sta
3、ndard was developed under procedures accredited as meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code o
4、r standard was madeavailable for public review and comment that provides an opportunity for additional public 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
5、 take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assume any such liability. Users
6、of a code or standard are expresslyadvised that determination of the validity of any such patent rights, and the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted a
7、sgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may
8、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 10016-5990Copyright 2005 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted
9、 in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the A112 Committee . vi1 General 12 Acceptable Materials and Components . 13 Testing 24 Accessories 55 Markings 5Figures1 Resistance Value Apparatus 32 Depth Versus Flow Apparatus . 5iiiFOREWORDThe American Society of Mechanical En
10、gineers has prepared this Standard for the purpose ofestablishing standardization and uniformity in the manufacture and testing of siphonic roofdrains as well as the practice of siphonic roof drainage design in the United States. This Standardis not intended to be static or immutable but shall be su
11、bject to periodic review and revision.Suggestions for the improvement of this Standard will be welcome. They should be sent toThe American Society of Mechanical Engineers, Attn: Secretary, A112 Standards Committee,Three Park Avenue, New York, NY 10016-5990.This Standard was approved as an American N
12、ational Standard on July 8, 2005.ivASME A112 COMMITTEEStandardization of PlumbingMaterials and Equipment(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERSD. W. Viola, ChairS. A. Remedios, Vice ChairC. J. Gomez, SecretaryCOMMITTEE PERSONNELR. H. Ackroyd,
13、Rand EngineeringJ. A. Ballanco, JB Engineering and Code ConsultingJ. Bouwer, Sanitary for All Ltd.M. N. Burgess, Burgess Group, Inc.S. L. Cavanaugh, ConsultantA. Ciechanowski, NSF InternationalA. Cohen, Arthur Cohen and AssociatesP. V. DeMarco, American Standard, Inc.N. Covino, Alternate, American S
14、tandard, Inc.G. S. Duren, Code Compliance, Inc.R. Emmerson, ConsultantL. S. Galowin, ConsultantC. J. Gomez, The American Society of Mechanical EngineersR. I. Greenwald, Sunroc Corp.E. Ho, IAPMOPROJECT TEAM 6.9 SIPHONIC ROOF DRAINSJ. M. Rattenbury, Project Team Leader, RMS Engineering LLCP. Sommerhei
15、n, Deputy Project Team Leader, Sommerhein, ABW. M. Smith, Project Team Secretary, Jay R. Smith Mfg. Co.S. Arthur, Heriot-Watt UniversityG. S. Duren, Code Compliance, Inc.vD. E. Holloway, SGS U.S. Testing Co.M. Klimboff, ConsultantM. T. Kobel, IAPMON. M. Kummerlen, Moen, Inc.L. A. Mercer, Alternate,
16、Moen, Inc.J. W. Lauer, Sloan Valve Co.R. M. Martin, California Energy CommissionP. W. Meikle, ConsultantS. Rawalpindiwala, Kohler Co.J. A. Sargent, Alternate, Kohler Co.S. A. Remedios, Delta Faucet Co.G. L. Simmons, Charlotte Pipe and FoundryL. M. Simnick, ICC InternationalW. M. Smith, Jay R. Smith
17、Mfg. Co.D. W. Viola, Plumbing Manufacturers InstituteR. E. White, ConsultantW. C. Whitehead, Plumbing and Drainage InstituteS. J. McDanal, Jay R. Smith Mfg. Co.J. S. Moore, Jr., CHB A Joint VentureJ. D. Sargeant, Cast Iron Soil Pipe InstituteM. Wearing, CRM Rainwater Drainage Consultancy Ltd.K. L. Y
18、ap, Fast Flow Siphonic PTE Ltd.CORRESPONDENCE WITH THE A112 COMMITTEEGeneral. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with the Committeeby requesting interpretations, proposing revision
19、s, and attending Committee meetings. Corre-spondence should be addressed to:Secretary, A112 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990Proposing Revisions. Revisions are made periodically to the Standard to incorporate changesthat appear ne
20、cessary or desirable, as demonstrated by the experience gained from the applicationof the Standard. Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard. Such proposals should beas specific as possible, citing the edition, the paragraph nu
21、mber(s), the proposed wording, anda detailed description of the reasons for the proposal, including any pertinent documentation.When appropriate, proposals should be submitted using the A112 Project Initiation Request Form.Interpretations. Upon request, the A112 Committee will render an interpretati
22、on of any require-ment of the Standard. Interpretations can only be rendered in response to a written request sentto the Secretary of the A112 Standards Committee.The request for interpretation should be clear and unambiguous. It is further recommendedthat the inquirer submit his/her request in the
23、following format:Subject: Cite the applicable paragraph number(s) and the topic of the inquiry.Edition: Cite the applicable edition of the Standard for which the interpretation isbeing requested.Question: Phrase the question as a request for an interpretation of a specific requirementsuitable for ge
24、neral understanding and use, not as a request for an approvalof a proprietary design or situation. The inquirer may also include any plansor drawings that are necessary to explain the question; however, they shouldnot contain proprietary names or information.Requests that are not in this format will
25、 be rewritten by the Committee prior to being answered,which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by
26、aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The A112 Standards Committee schedules meetings as needed,which are open to the p
27、ublic. Persons wishing to attend any meeting should contact the Secretaryof the A112 Standards Committee.viASME A112.6.9-2005SIPHONIC ROOF DRAINS1 GENERAL1.1 ScopeThis Standard establishes minimum requirements andprovides guidelines for the proper design, installation,examination, and testing of sip
28、honic roof drains. Itincludes definitions of terms and parameters involvedin the proper design of siphonic drainage systems.This Standard applies to roof drains designed, manu-factured, and installed in piping systems that areintended to operate under depressurized siphonic con-ditions created by th
29、e connected piping system.Unless noted otherwise in this Standard, the require-ments and standards for roof drains specified in ASMEA112.6.4 do not apply to siphonic roof drains.This Standard does not apply to conventional roofdrains covered under ASME A112.6.4.It is not the intent of this Standard
30、to specify that adrain of a given diameter must drain a minimum ormaximum amount of water. It is the intent of this Stan-dard to provide standardized test procedures to ensurethat drain products are evaluated equally.This Standard does not dictate minimum flow ordepth performance criteria for siphon
31、ic roof drains.Instead, it specifies standard test procedures to be per-formed on siphonic roof drain products to documenttheir actual performance and physical limits. These dataare to be made available in manufacturer literature foruse by designers for selecting the drain product andentering perfor
32、mance characteristics into design calcula-tions.1.2 Units of MeasurementValues are stated in U.S. Customary units and in theInternational System of Units (SI). The U.S. Customaryunits shall be considered as the standard.1.3 ReferenceThe following document forms a part of this Standardto the extent s
33、pecified herein. Unless otherwise indi-cated, the latest edition shall apply.ASME A112.6.4, Roof, Deck, and Balcony DrainsPublisher: The American Society of Mechanical Engi-neers (ASME), Three Park Avenue, New York, NY10016-5990; Order Department: 22 Law Drive, P.O.Box 2300, Fairfield, NJ 07007-2300
34、11.6 Definitions and Nomenclature1.6.1 Definitionsair baffle: a device that limits the flow of air into a drain,causing the connected drainage piping to run at full-bore flow at dimensional rainfall intensity with a limitedwater depth on the roof surface.depressurized: the condition or state of bein
35、g below atmo-spheric or ambient pressure.designer: the specifier of a siphonic roof drain product.drain outlet: the drain “neck” of a siphonic roof drainconfigured to connect to the tailpiece with a standardcoupling device.full-bore flow: the flow of water in a pipe where theoreti-cally 100% of the
36、cross-section of the pipe bore is filled.In practical terms, full-bore flow is regarded as achievedat water content greater than 95% by volume.single resistance value, Ki: a coefficient that is characteristicof a pipe fittings or drains contribution to energy losses.1.6.2 Nomenclaturecfs p cubic fee
37、t per seconddip pipe inner diameter, ftf p friction factor (dimensionless)g p gravitational constant, 32.2 ft/sec2gpm p gallons per minutehtp height, ftKip single resistance value (dimensionless)k0p resistance coefficient (dimensionless)L p pipe length, ftL/s p liters (metric liquid) per secondP p s
38、tatic pressure, lbf/ft2or ft H20Q p volumetric flow, cfsRe p Reynolds Number (dimensionless)H9267 p fluid density, slug/ft3V p fluid velocity, ft/secH9263 p fluid kinematic viscosity, ft2/secw.c. p water column2 ACCEPTABLE MATERIALS AND COMPONENTS2.1 Siphonic Roof DrainsThe materials of construction
39、, finishes, and hardwarecomponents used to manufacture siphonic roof drainsshall comply with the requirements of ASME A112.6.4,para. 5.ASME A112.6.9-2005 SIPHONIC ROOF DRAINS3 TESTING3.1 General3.1.1 Manufacturers of siphonic roof drains may uti-lize existing conventional drain body designs with ana
40、ir baffle adaptor to achieve siphonic capability whenconnected to a properly engineered siphonic drainagepiping system. This adaptation, however, requireshydraulic analysis in order to ensure the baffle designis stable, will be capable of priming, and will minimizethe depth of water on the roof as m
41、uch as possible.3.1.2 Siphonic roof drain products shall be verifiedexperimentally and have documented results.3.1.3 The design of any air baffle and drain shallfollow three main principles:(a) It shall be able to prime the test standpipe quickly.Thus, the height of the baffle above the sump bowlsho
42、uld be minimized. This will help achieve a highReynolds Number beneath the baffle and the necessaryturbulence for proper air to water mixing duringpriming.(b) The baffle shall not introduce a limiting effect withrespect to maximum flow. In other words, the drain shallbe limited in maximum flow capac
43、ity by the fixed spigotdrain diameter and not by the introduction of a baffle.(c) The first two goals must be balanced with thedesire to have a minimum of water depth on the roofabove the baffle, which means that the resistance of thebaffle/drain/strainer combination should be mini-mized.3.2 Design
44、of Siphonic Drains3.2.1 The design of any siphonic roof drain shallfollow the basic principles described in para. 3.1.3.3.2.2 The materials, spigot connections, compo-nents, and leaf guard designs of siphonic roof drainsshall meet with the minimum requirements of ASMEA112.6.4, with the exception of
45、the air baffle design.3.2.3 This Standard is not intended to restrict orprohibit the development or application of new andinnovative siphonic roof drainage products providedthat such products conform to the spigot connectionrequirements of ASME A112.6.4.3.2.3.1 A spigot connection type shall not red
46、uceor increase the flow path in a manner that will alter thedrains tested single resistance value.3.3 Testing of Siphonic Roof Drains3.3.1 The following test procedures shall be appliedto siphonic roof drain products.3.3.2 These tests have three purposes(a) to determine the relationship between the
47、flowrate entering the drain and the depth of water at the2approach to the drain (i.e., the flow rating curve for theproduct)(b) to determine the head loss coefficient (i.e., singleresistance value) for the drain for use by the designerfor designing the piping system in which the drain willbe install
48、ed(c) to check the effectiveness of the drain at preventingentry of air and for the speed of response to suddenchanges in flow rate3.3.3 The performance characteristics of a siphonicroof drain product are vital in the attainment of full-bore flow in the connected piping system.3.3.4 The relationship
49、 between flow rate andupstream depth of rain water depends on where thedrain is to be installed. For a given flow rate, the depthwill be less on a flat roof than in a gutter. The narrowerthe gutter, the greater the upstream depth. Siphonic roofdrains shall be tested for the most critical condition inwhich the drain is intended to be installed.3.3.5 These test procedures do not include the per-formance and flow capacity of the connected siphonicpiping system.3.4 Test Apparatus, Single Resistance Value (LossCoefficient)3.4.1 The test apparatus (Fig. 1) for quantifying asiphonic roof
