1、Performance Requirements for Backflow Preventers with an IntermediateAtmospheric VentAmerican Society of Sanitary EngineeringASSE Standard #1012-2009ASSE Board Approved: March, 2009ANSI Approval: September, 2009An American National StandardBackflow Preventer with Intermediate Atmospheric Vent iASSE
2、Standard #1012 - 2009American Society of Sanitary EngineeringWestlake, OhioCopyright 2009, 2002, 1993, 1981, 1970All rights reserved. Neither this standard, nor any portion thereof, may be reproduced without the written consent of the American Society of Sanitary Engineering.No product may be said t
3、o be ASSE approved unless the manufacturer has applied to the ASSE, has had his product tested according to the applicable ASSE Standards, and when the product has passed the test, displays the ASSE Seal on the product.Instructions for receiving the authorization to display the Seal are available fr
4、om ASSEs International Office. Organizations wishing to adopt or list any ASSE Standard should print the ASSE Standard number on the cover page first and in equal or larger type to that of the adopting or listing organization.General Informationii Backflow Preventer with Intermediate Atmospheric Ven
5、tASSE Standard #1012 - 2009Backflow Preventer with Intermediate Atmospheric Vent iiiASSE Standard #1012 - 2009This foreword shall not be considered a part of the standard, however, it is offered to provide background information.ASSE standards are developed in the interest of consumer safety.The rec
6、ognition of probable sources or causes of contamination of a potable water supply system and the applica-tion of essential devices, or means, to prevent the entrance of contaminants to the potable water supply system whereby it becomes unfit for human or animal consumption, is vital to the maintenan
7、ce of its continued potability.There are two basic and practiced methods for the protection of the potable water supplies:(a) Protection by Containment:That is the isolation, by suitable devices or means, of the system within the premises supplied, wherein may lie the source or sources of contaminat
8、ion, from the venders or public water supply system.(b) Protection of Each Individual Outlet:By suitable devices or means, which outlets, within the premises served may be a source of contamination.Protection by containment protects the venders or public water supply only by isolation of a building
9、from the source of supply. It does not provide protection within the premises supplied.Serious contamination of the potable water supply within the premises can be hazardous to the health of the oc-cupants therein unless every potentially offending outlet is protected.Within every occupancy there ar
10、e outlets which can be sources of contamination. Each occupancy has conditions peculiar to its nature and the degree of health hazards vary widely from minor to potentially fatal.Contaminant flow into a potable water supply system from a polluted source is caused by backflow due to either back press
11、ure or back-siphonage or both. Consequently, the control of the conditions of cause requires preventive devices or means of varying behavioral characteristics.Contemporary backflow preventive devices are of many classes, ranging from the simple air gap and atmospheric vacuum breaker through several
12、classes of check valve assemblies, some with intermediate atmospheric vents and vacuum breakers to the sophisticated reduced pressure backflow preventer. Each is tailored to the protective requirements essential to specified system conditions and the degree of health hazard involved.The devices cove
13、red by this standard are designed to give protection against low hazard backpressure backflow, back-siphonage or both, if needed on individual outlets. They are not designed nor intended for building isolation or high hazard conditions which would find full protection only by the reduced pressure ba
14、ckflow preventer.The devices covered by this standard are suitable for both hot and cold water systems under either intermittent or continuous pressure conditions.Forewordiv Backflow Preventer with Intermediate Atmospheric VentASSE Standard #1012 - 2009Although many of the material specifications ar
15、e detailed within Section IV of this standard, it is the responsibility of the manufacturer to comply with the requirements of the Safe Drinking Water Act, United States Public Law 93-523.The working group which developed this standard revision, was set up within the framework of the Product Stan-da
16、rds Committee of the American Society of Sanitary Engineering.Recognition is made of the time volunteered by members of this working group and of the support of the manu-facturers who also participated in the meetings for this standard.This standard does not imply ASSEs endorsement of a product whic
17、h conforms to these requirements.Compliance with this standard does not imply acceptance by any code body.It is recommended that these devices be installed consistent with local codes by qualified and trained professionals.This standard was promulgated in accordance with procedures developed by the
18、American National Standards Institute (ANSI).This edition of the standard was approved by the ASSE Board of Directors on March 11, 2009, as an ASSE standard.Backflow Preventer with Intermediate Atmospheric Vent vASSE Standard #1012 - 2009Edward J. LyczkoProduct Standards Committee ChairmanCleveland
19、Clinic FoundationCleveland, OhioRand H. AckroydRand Technical Consulting, LLCNewburyport, MassachusettsWilliam Briggs, Jr.MGJ Associates New York, New YorkJudson W. CollinsJULYCO ProfessionalsMannford, OklahomaA. Richard EmmersonGeneral InterestBuffalo Grove, IllinoisRon GeorgeRon George Design (b)
20、Type or model number of the device;(c) Maximum rated working pressure;(d) Maximum water temperature for which the device is designed;(e) Serial number or other marking consistent with the manufacturers standard practice;(f) Nominal valve size; and(g) The direction of water flow through the device.4.
21、2.2 The marking shall be either cast, etched, stamped or engraved on the body of the device or on a durable metal plate securely attached to the device.Backflow Preventer with Intermediate Atmospheric Vent 11ASSE Standard #1012 - 2009Section V5.0 DefinitionsDefinitions not found in this Section are
22、located in the Plumbing Dictionary, Sixth Edition published by ASSE.12 Backflow Preventer with Intermediate Atmospheric VentASSE Standard #1012 - 2009Appendix AThis appendix shall not be considered a part of the standard.A1.0 Installation InstructionsA1.1 Complete instructions for installation of th
23、e device shall be packaged with it. Drawings or schematic sketches which would be useful to the installer shall be part of these instructions. A1.2 Complete detailed instructions shall be furnished with the packaged unit for devices capable of being maintained or repaired in the field.A1.3 The follo
24、wing language shall be part of the installation instructions: “The device shall not be installed in a concealed or inaccessible location or where the venting of water from the device during its normal functioning may be deemed objectionable.”A1.4 The manufacturer shall state in the installation instructions the minimum working pressure of the device.American Society of Sanitary Engineeringfor plumbing and sanitary research901 Canterbury Road, Suite A Westlake, Ohio 44145-1480 USATEL: (440) 835-3040 FAX: (440) 835-3488E-mail: general.infoasse-plumbing.org Web: http:/www.asse-plumbing.org
