1、B55.2-12Drain water heat recovery unitsLegal Notice for StandardsCanadian Standards Association (operating as “CSA Group”) develops standards through a consensus standards development process approved by the Standards Council of Canada. This process brings together volunteers representing varied vie
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18、ange. 2012 CSA Group Drain water heat recovery unitsJuly 2012 1B55.2-12Drain water heat recovery units1Scope1.1This Standard specifies requirements for the durability and safety of vertically installed, falling-film drain water heat recovery (DWHR) units.1.2This Standard applies to DWHR units of any
19、 diameter and length and configuration for use with potable water, and to their components and materials supplied by the manufacturer, their assembly and installation instructions, and their operation after assembly in accordance with these instructions. This Standard does not apply to site preparat
20、ion or installation procedures.1.3This Standard is not intended as a design specification or as an instruction manual for untrained persons.1.4In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “shou
21、ld” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompany
22、ing a clause is to separate from the text explanatory or informative material.Notes to tables and figures are considered part of the table or figure and may be written as requirements.Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.2 Reference p
23、ublicationsThis Standard refers to the following publications, and where such reference is made, it shall be to the edition listed below, including all amendments published thereto.ASME (The American Society of Mechanical Engineers)B16.18-2012Cast Copper Alloy Solder Joint Pressure FittingsB16.22-20
24、01 (R2005)Wrought Copper and Copper Alloy Solder Joint Pressure FittingsASTM International (American Society for Testing and Materials)B88-09Standard Specification for Seamless Copper Water TubeB306-09Standard Specification for Copper Drainage Tube (DWV)B55.2-12 2012 CSA Group2 July 2012AWS (America
25、n Welding Society)ANSI/AWS A5.8/A5.8M:2004Specification for Filler Metals for Brazing and Braze Welding3 DefinitionThe following definition shall apply in this Standard:Drain water heat recovery (DWHR) unit a double-wall, vented falling-film heat exchanger with a visible means of leak detection desi
26、gned to transfer heat from drain water to potable water.Note: “Double-wall” implies having two distinct tubes separating the drain water from the potable water.4 Classification of drain water heat recovery unitsDWHR units shall have two distinct walls separating the drain water from the potable wate
27、r and be deemed acceptable for potable water service complete with a visible means of leak detection.5Materials5.1 Manufacturing materials5.1.1Materials in contact with drain water shall be a minimum thickness of Type DWV copper tube, conforming to ASTM B306.5.1.2Materials in contact with potable wa
28、ter shall be a minimum thickness of Type L copper tube, conforming to ASTM B88. Non-tube copper components in contact with potable water shall have a minimum thickness of 1.7 mm and shall be Copper No. C12000 or C12200.5.1.3Standard fittings used in the manufacturing of DWHR units shall comply with
29、ASME B16.22 or ASME B16.18.5.1.4Connections between the coiled water supply tubes and a fabricated manifold shall be brazed using a filler metal with a melting point in the range of 590 to 815 C. Brazing alloys shall conform to the ANSI/AWS A5.8/A5.8M, BCuP range.5.2 Installation materials5.2.1DWHR
30、units shall have drainage connections compatible with industry standard cast iron, copper, and plastic pipe used in drainage systems for which the unit is designed.5.2.2DWHR units shall have water connections compatible with industry standards for copper and PEX. 2012 CSA Group Drain water heat reco
31、very unitsJuly 2012 36 Pressure testing Minimum burst pressureThe heat transfer fluid or potable water section of a sample DWHR unit shall pass without leakage a hydrostatic test at 1.5 times the manufacturers design pressure or not less than 1550 kPa (225 psi), whichever is greater, for a duration
32、of 15 min.7 Marking and labelling7.1 GeneralMarking and labelling requirements not otherwise specified in this Standard should be of such a nature and be located to satisfactorily serve the needs of the system owner.Note: Marking and labelling should meet the requirements of the applicable authoriti
33、es having jurisdiction.7.2 MarkingThe system shall be supplied and installed with the following information clearly and permanently displayed:(a)the manufacturers name or product trademark;(b) the model number; and(c) the serial number.Note: Markings should be in both metric and imperial units, and in English and French.PRINTED IN CANADAIMPRIMEAU CANADA100%ISBN 978-1-55491-889-8CSA Group prints its publications on Rolland Enviro100, which contains 100%recycled post-consumer fibre, is EcoLogo and Processed Chlorine Free certified, and was manufactured using biogas energy.
