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1、ASSE Standard #lo35 Issued: July, 1981 ANSI Approved: March, 1984 Revised: December, 1993 ANSI Approved: June 6,1995 Revised: September, 2002 Americun Society of Sanita y Engneerng Performance Requirements for Laboratory Faucet Backflow Preventers Copyright American Society of Sanitary Engineering P
2、rovided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted without license from IHS -,-,- General Information Neither this standard, nor any portion thereof, may be reproduced without the
3、written consent of the American Society of Sanitary Engineering. No product may be said to be ASSE approved unless the manufacturer has applied to ASSE, has had his product tested according to the applicable ASSE standard, and when the product has passed the test, displays the ASSE Seal on the produ
4、ct. Instructions for receiving the authorization to display the Seal are available from 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 or
5、ganization. American Society of Sanitary Engineering Westlake, Ohio Copyright O 2002, 1993, 1981 All rights reserved. go35 - Laboratory Faucet BacMow Preventers Revised: September, 2002 i Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employee
6、s/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword This foreword shall not be considered a part of the standard, however, it is offered to provide background information. ASSE standards are developed
7、in the interest of consumer safety. The American Society of Sanitary Engineering for Plumbing and Sanitary Research is dedicated to the preservation of public health and safety through “Prevention Rather than Cure.“ Preventing potable water in plumbing systems from becoming contaminated or polluted
8、is an important objective of ASSES Standards Program. The program addresses the development and promulgation of standards embracing performance criteria for manufactured plumbing components designed to safeguard public health and safety. Recognizing the probable sources or causes of contamination or
9、 pollution of a potable water system which can cause it to become unfit or undesirable for human consumption is vital to the maintenance of its continued potability. Backflow prevention is essential for all laboratory water outlets because of the serious contamination potential existing there due to
10、 the real and/or potential cross connections present in laboratories. For this reason, this standard was developed to cover devices designed especially for this service. This standard is one of a series of ASSE Backflow Preventer Standards, each of which covers a different type of backflow protectio
11、n device, each tailored to the protective requirements essential to the specific system conditions in which it is installed and the degree of hazard involved. Although many of the material specifications are detailed within Section IV of this Standards, it is the responsibility of the manufacturer t
12、o 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 Standards Committee of the American Society of Sanitary Engineering. Recognition is made of the tim
13、e volunteered by members of this working group and of the support of the manufacturers who also participated in the meetings for this standard. This standard does not imply ASSES endorsement of a product which conforms to these requirements. #IO35 - Laboratory Faucet Backflow Preventers Revised: Sep
14、tember, 2002 iii Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted without license from IHS -,-,- Compliance with this standard
15、 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 American National Standards Institute (ANSI). This edition o
16、f the standard was approved by the ASSE Board of Directors on September 3, 2002, as an ASSE standard. iv #I035 - Laboratory Faucet Backflow Preventers Revised: September, 2002 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001
17、, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 2001 -02 Product Standards Committee Richard J. Prospal Standards Committee Chairman Reliance Mechanical Cleveland, Ohio Rand H. Ackroyd Rand Engineering Newburyport, Mas
18、sachusetts Michael Beckwith State of Wisconsin DILHR Madison, Wisconsin Charles Caruana Canadian Standards Association Etobicoke, Ontario, Canada Gunnar O. Collins Collins BacMow Specialists, Inc. Palatine, Illinois Shannon M. Corcoran ASSE Standards Coordinator Westlake, Ohio A. Richard Emmerson Ch
19、icago Faucet Company Des Plaines, Illinois Dale Holloway SGS United States Testing Company Tulsa, Oklahoma Michael Kobel International Association of Plumbing and Mechanical Officials Walnut, California Valentine Lehr, P.E. Lehr Associates New York, New York Peter Marzec United Association of Plumbe
20、rs and Pipefitters Washington, D. C. Perry W. Meikle P. W. Meikle Consultants Antioch, California S ha b bi r Rawal pi n d i wa la Kohler Company Kohler, Wisconsin Lynne Simnick Building Officials and Code Administrators, Inc. Country Club Hills, Illinois Jack Vilendre Precision Plumbing Products, I
21、nc. Portland, Oregon David Viola Plumbing Manufacturers Institute Schaumberg, Illinois Joseph C. Zaffuto, P.E. ASSE Staff Engineer Westlake, Ohio #1 O35 - Laboratory Faucet Backflow Preventers V Revised: September, 2002 Copyright American Society of Sanitary Engineering Provided by IHS under license
22、 with ASSE Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted without license from IHS -,-,- Table of Contents Section I . 1 1.1 Application 1 1.2 Scope 1 1.3 Reference Standards 2 Section II 3 2.1 Samples Submitted for
23、 Test 3 2.2 Samples Tested 3 2.3 Drawings . 3 2.0 Test Specimens 3 2.4 Rejection . 3 Section 111 . 4 3.0 Performance Requirements and Compliance Testing 4 3.1 Hydrostatic Testing of Complete Device . 4 Figure 1 . 4 3.2 Deterioration at Extremes of Manufacturers Temperature and Pressure Range . 5 3.3
24、 Back Pressure of Downstream Check 5 3.4 Tightness of Checks 5 3.5 Atmospheric Vent Valve Leakage . 6 3.6 Backflow Through the Inlet Check . 6 Figure 2 . 7 3.7 Backflow Through Outlet Check 7 3.8 Back Siphonage . 7 Figure 3 . 8 Figure 4 . Figure 5 . 8 3.9 Back Siphonage Back Pressure 8 Figure 6 . 8
25、3.10 Flow and Pressure Loss 9 Section IV . 10 4.0 Detailed Requirements 10 4.1 Materials . 10 4.2 Markings . 11 4.3 Installation and Maintenance Instructions 11 Section V 12 5.0 Definitions .= . 12 Vi #lo35 . Laboratory Faucet Backnow Preventers Revised: September. 2002 Copyright American Society of
26、 Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted without license from IHS -,-,- Performance Requirements for Laboratory Faucet Backflow Preventers Laborato
27、ry Faucet Backflow Preventers are designed to protect the potable water supply from pollutants or contaminants which enter the system by backflow due to back siphonage or back pressure. 1.2.1 Description This standard applies only to those devices classified as backflow preventers that are designed
28、for installation on laboratory faucets on the discharge side of the last shut-off valve. These devices are not for use under constant pressure conditions. These devices consist of two independently acting check valves, force loaded or biased to a normally closed position, and between the check valve
29、s a means for automatically venting to atmosphere, force loaded or biased to normally open position. 1.2.2 Working Pressure The devices shall be designed for a minimum working pressure of not less than 861.9 kPa (125.0 psi). 1.2.3 Temperature Range The devices shall be designed for flow temperatures
30、 between 0.6 O C to 82.2 “C (33.0 O F to 180.0 OF). 1.2.4 Minimum Flow Capacity The device shall havea minimum flow capacity of 15.0 Umin (4.0 GPM) with a maximum pressure loss through the device of 137.9 kPa (20.0 psi). 1.2.5 Connections Connections shall be suitable for laboratory faucets. (Inlet
31、and/or outlet connections are permitted to be different when required for special installations.) 1.2.6 Flow Way Open Area The least total cross-sectional area of the air flowways, including the seat area of the air vent valve, shall be not less than the least total cross-sectional area of the water
32、flow passage or passages upstream from the air vent valve. The minimum cross-sectional dimensions of any air port or flow way, not including the valve lift, shall not be less than 2.4 mm (3132“). These requirements shall be verified by the testing agency. #lo35 - Laboratory Faucet Backflow Preventer
33、s Revised: September, 2002 1 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 1.2.7 Atmospheric
34、 Vent a. The atmospheric vent shall be constructed so that it will open when the supply pressure is atmospheric or below. b. The atmosphericvent shall be constructed so that under a back pressure condition it will open. c. The atmospheric vent shall be constructed to provide vacuum breaking ability.
35、 1.2.8 Repairability a. The internal parts of the device shall be accessible for inspection, repairs or replacements. b. All replaceable parts of the device of the same size and model shall be interchangeable with the original parts. Reference to industry standards shall be to the latest edition. 2
36、#lo35 - Laboratory Faucet Backflow Preventers Revised: September, 2002 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted withou
37、t license from IHS -,-,- Three (3) devices of each size and model shall be submitted by the manufacturer. Tests shall be performed in the order listed on one (1) device. The testing agency shall select one (1) of each type or model and size for the full test. Assembly drawings and other data which a
38、re needed to enable a testing agency to determine compliance with this standard, togetherwith installation drawings, shall accompany devices when submitted for examination and performance tests under this standard. Failure of one (1) device shall result in a rejection of that type or model and size
39、until the manufacturer has corrected the fault and submitted new devices for testing. #lo35 - Laboratory Faucet Backflow Preventers Revised: September, 2002 3 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=Wing, Bern
40、ie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 3.1 .i Purpose The purpose of this test is to determine if the device withstands pressures that equal two (2) times the minimum working pressure per Section 1.2.2 or the manufacturers rat
41、ed working pressure, whichever is greater, without leakage or damage to the device. 3.1.2 Procedure Install the device in the test system as in Figure 1. Admit water through the inlet of the device allowing water to flow through it to purge it of air. Close the outlet valve and build up the supply p
42、ressure to the maximum required test pressure. Allow the device to stand under pressure for five (5) minutes and examine it for leaks. Figure 1 Pressure reducing vdve Pressure gauge Flow meter o T Bleeder valve b connection to Sight glass hydrostatic test Shut-off vdve I Supply Shut-off vdve vdve Sh
43、ut-off I valve - Minimum d (42 inches) - Approximately 10 I f diameters straight pipe. Ring piezometer connection for differential pressure gauge 1 A Back pressure Pressure Drain supply valve reducing valve 3.1.3 Criteria Any leaks or indications of damage shall result in a rejection of the device.
44、4 #I035 - Laboratory Faucet BacMow Preventers Revised: September, 2002 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 01:12:58 MDTNo reproduction or networking permitted withou
45、t license from IHS -,-,- 3.2.1 Purpose The purpose of this test is to evaluate the materials performance at extremes of manufacturers temperatures and pressures. 3.2.2 Procedure Install the device with equipment capable of maintaining the manufacturers maximum rated temperature and pressure. Flow ho
46、t water through to the device on test at 7.6 Umin (2 gallons per minute) continuously. Flow hot water through the device for eight hours per day for a total of ten days (80 hours). At the completion of 80 hours, run water maintained between 0.6 “C and 4.4 “C (33.0 “F and 40.0 O F ) through the devic
47、e for a minimum of one (1) hour. 3.2.3 Criteria Any indication of change in the physical characteristics of the material which prevents full compliance with the remaining tests of this standard shall result in a rejection of the device. 3.3.1 Purpose The purpose of this test is to verify the tightne
48、ss of the downstream check when subjected to a back pressure equal to the rated working pressure. 3.3.2 Procedure The inlet check valve shall be removed or mechanically held open, and the air vent shall be sealed closed. Install the device as shown in Figure 1, including the sight glass with the shut-off cock installed upstream of the inlet check valve. Purge the device of air. Close the supply valve, and open the shut-off cock to the sight glas