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ASME A112.4.1-2009 pdf download

ASME A112.4.1-2009 pdf download.Water Heater Relief Valve Drain Tubes.
General. ASME standards are developed and maintained with the intent to represent the consensus of concerned interests. As such, users of this Standard may interact with the committee by requesting interpretations, proposing revisions, and attending committee meetings. Correspondence should be addressed to: Secretary, A112 Standards Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990 http://go.asme.org/Inquiry Proposing Revisions. Revisions are made periodically to this Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the edition, the paragraph number(s), the proposed wording, and a 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. Proposing a Case. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page. Requests for Cases shall provide a Statement of Need and Background Information. The request should identify the standard, the paragraph, figure or table number(s), and be written as a Question and Reply in the same format as existing Cases. Requests for Cases should also indicate the applicable edition(s) of the standard to which the proposed Case applies. Interpretations. Upon request, the Committee will render an interpretation of any requirement of the standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the A112 Standards Committee. The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his/her request in the 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 is being requested. Question: Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. The inquirer may also include any plans or drawings that are necessary to explain the question; however, they should not contain proprietary names or information. Requests that are not in this format will be rewritten in this format 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 additional information that might affect an interpretation is available. Further, persons aggrieved by an interpretation 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 regularly holds meetings, which are open to the public. Persons wishing to attend any meeting should contact the Secretary of the A112 Standards Committee.
1 GENERAL 1.1 Scope This Standard establishes performance requirements and test methods applicable to water heater relief valve drain (or runoff) tubes for use with relief valves having a steam rating of 105,000 Btu/hr or less. 1.2 Reference Standards The following reference standards shall be used to evaluate the product, and are cited herein. Unless indi- cated, the latest edition of these standards shall be appli- cable for certification to this Standard. ANSI Z21.22, Relief Valves for Hot Water Supply Systems Publisher: International Association of Plumbing and Mechanical Officials (IAPMO), 20001 Walnut Drive, South Walnut, CA 91789-2825 (www.iapmo.org) ASME B1.20.1, Pipe Threads, General Purpose (Inch) Publisher: The American Society of Mechanical Engineers (ASME), Three ParkAvenue, New York, NY 10016-5990; Order Dept: 22 Law Drive, P. O. Box 2900, Fairfield, NJ 07007-2900 (www.asme.org) 2 REQUIREMENTS 2.1 Size The drain tube shall have a minimum inside diameter of 3 ⁄ 4 in. and a minimum length of 48 in. 2.2 Material The material that is used in the composition of the drain tube shall be capable ofwithstanding the tempera- ture tests cited in section 3 without collapse or perma- nent distortion. Materials shall be corrosion resistant. 2.3 Joints Any joints within the tube shall be firmly affixed and shallwithstand thetemperature tests withoutseparation or leakage. Assembly of the drain tube to the relief valve shall be possible by hand-tightening only. Connecting threads shall comply with ASME B1.20.1 for 3 ⁄ 4 in. NPT pipe threads.

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