1、Performance Requirements for Chemical Dispensing SystemsASSE InternationalASSE Standard #1055-2016ASSE Board Approved: October, 2016 ANSI Approved: January, 2017 An American National StandardChemical Dispensing Systems iASSE Standard #1055-2016ASSE InternationalMokena, IllinoisCopyright 2016, 2009,
2、1997All rights reserved.Neither this standard, nor any portion thereof, may be reproduced without the written consent of ASSE International.No product may be said to be listed by ASSE unless the manufacturer has applied to ASSE International, had its product tested by an official ASSE recognized ind
3、ependent laboratory according to the applicable standard, passed the tests, and had its documentation reviewed and approved by the consensus ASSE Seal Control Board. Having completed the aforementioned, the manufacturer may display the ASSE Seal on the product.Instructions for receiving the authoriz
4、ation to display the seal are available from the ASSE International office. Organizations wishing to adopt or list any ASSE standard should print the ASSE standard number on the cover page first in equal or larger type to that of the adopting or listing organization.General Informationii Chemical Di
5、spensing Systems ASSE Standard #1055-2016Chemical Dispensing Systems iiiASSE Standard #1055-2016This foreword is not part of the standard; however, it is offered to provide background information.ASSE International is dedicated to the preservation of public health and safety through “Prevention Rath
6、er than Cure.” Prevention of contamination or pollution of potable water in plumbing systems is one of the major objectives of the ASSE Standards Program through the development and promulgation of Standards embracing performance criteria.In industrial and institutional cleaning operations, it is de
7、sirable and convenient to dispense cleaning solutions derived from potable water and concentrated products. A dispensing device connected to potable supply constitutes a cross-connection, which could be a source of contamination to the potable water. Devices providing this function often contain fea
8、tures that are intended to prevent this contamination. This standard identifies accepted methods of backflow protection, as well as test methods for evaluating backflow systems incorporated into a chemical dispensing system.Recognition is made of the time volunteered by members of this working group
9、 and the support of manufacturers, who also participated in the meetings for this standard.This standard does not imply ASSEs endorsement of a product that conforms to these requirements. Compliance with this standard does not imply acceptance by any code body.This standard was promulgated in accord
10、ance with procedures developed by the American National Standards Institute (ANSI).This edition of the standard was approved by the ASSE Board of Directors on Oct. 3, 2016 as an ASSE Standard.Forewordiv Chemical Dispensing Systems ASSE Standard #1055-2016Edward J. Lyczko, ChairpersonCleveland Clinic
11、 Retiree Cleveland, OHWilliam Briggs, Jr.MGJ AssociatesNew York, NYTerry BurgerNSF InternationalYpsilanti, MIWilliam ChapinProfessional Code Consulting, LLCCullman, ALMark FishZurn Industries, LLCCary, NCRon GeorgePlumb-Tech Design forward, backward, right side, and left side.3.1.3 CriteriaFailure o
12、f the device to return to the upright condition and remain upright during any of the tests shall result in a rejection of the device.3.2 Deterioration at Extremes of Manufacturers Rated Temperature and Pressure Ranges and Endurance Test3.2.1 PurposeThe purpose of this test is to determine the abilit
13、y of the device to:a) Withstand 180 F (82.2 C) for hot water devices or 120 F (48.9 C) for cold water devices, and 125.0 psig (861.9 kPa) or the manufacturers maximum rated temperature and pressure, whichever is greater, without leakage or deformation of components; andb) Provide service over time w
14、ithout deterioration of performance.3.2.2 Procedurea) Install the device according to the manufacturers installation instructions. Cycle the device 5000 times using water at the temperatures and pressure specified in Section 3.2.1 (a). One (1) cycle consists of operating the device to allow flow (on
15、 time) and then stop flow (off time). The “on” time shall not be less than five (5) seconds, and the “off” time shall not exceed thirty (30) seconds.b) Check the device for any failures.c) Immediately after checking the device, operate the device to allow it to flow for eight (8) hours per day for f
16、our (4) days.d) Check the device for any failures.3.2.3 CriteriaAny change in the physical characteristics of the materials that prevents compliance with the remaining requirements of this standard shall result in a rejection of the device.3.3 Pressure Tests3.3.1 PurposeThe purpose of this test is t
17、o determine the ability of the device to withstand a pressure of 187.5 psig (1293 kPa) or 150% of the manufacturers maximum rated pressure, whichever is greater, without leakage or damage to the device. 4 Chemical Dispensing Systems ASSE Standard #1055-20163.3.2 ProcedureDevices that incorporate shu
18、t off valve(s) shall be installed in accordance with the manufacturers installation instructions with the inlet connected to a water supply. The device shall be purged of air. Close the shut off valve(s) and apply a hydrostatic pressure as specified in Section 3.3.1 at the inlet using water at ambie
19、nt temperature. Hold for a period of five (5) minutes and examine for leaks or damage.Devices that do not incorporate shut off valve(s) shall be installed in accordance with the manufacturers installation instructions with the inlet connected to a water supply. The device shall be purged of air. App
20、ly a hydrostatic pressure as specified in Section 3.3.1 at the inlet using water at ambient temperature. Hold for a period of five (5) minutes and examine for leaks or damage.3.3.3 CriteriaAny leaks or damage shall result in a rejection of the device.3.4 Backpressure3.4.1 PurposeThe purpose of this
21、test is to determine if any contaminated water is transmitted back into the potable water system when backpressure is encountered. This test applies only to those devices intended for use with a discharge hose.3.4.2 ProcedureInstall the device with a transparent tube connected to the inlet of the de
22、vice. The dispensing hose of the device shall be filled with colored water, and the outlet shall be pressurized to produce backpressure equal to 6 inches of water column (1.5 kPa). Hold for five (5) minutes and observe for the presence of colored water in the transparent tube at the inlet.Repeat the
23、 test with the pressure increased in increments of 24 inches of water column (6.0 kPa) until a pressure equal to the backpressure created by the maximum possible height of the dispensing hose of the device is reached.3.4.3 CriteriaAny indication of colored water in the transparent tube shall result
24、in a rejection of the device.3.5 Backsiphonage 3.5.1 PurposeThe purpose of this test is to determine if any contaminated water can be siphoned back into the potable water system.3.5.2 ProcedureThe water inlet of the device under test shall be connected to a three-way valve that can provide a rapid s
25、witch from water input to a vacuum. See Figure 1. The vacuum source shall have the capacity to maintain a minimum of 25 inches of mercury (84.7 kPa) vacuum for five (5) minutes of test. A water separator or a sight glass shall be installed in the piping as shown in Figure 1 as a means of detecting b
26、ackflow. All check members shall be held open to create a water flow path that at least equals the area of the smallest orifice downstream of the check member. A coloring agent shall be used to simulate chemicals in the water. The device shall be held in the open mode to dispense used solution, and
27、the dispensing hose, if used, shall be submerged in heavily colored water.Chemical Dispensing Systems 5ASSE Standard #1055-2016With the three-way valve connecting the device under test with potable water, dispense used solution until all air is out of the system. Then by means of the three-way valve
28、, open the system to the vacuum source. The vacuum shall be at least 25 inches of mercury (84.7 kPa) for five (5) minutes. Repeat the test three (3) times.Repeat test for each dispensing path of the device.Figure 1 DeviceConcentratedSolutionDilutedSolutionSightGlassWaterSeparatorPressure / Vacuum Ga
29、ugeVacuumPumpVacuumTankThree-WayQuick-ActingValveShut-off ValvePotableWater3.5.3 CriteriaAny indication of colored water in the sight glass shall result in a rejection of the device. 6 Chemical Dispensing Systems ASSE Standard #1055-2016Section IV4.0 Detailed Requirements4.1 MarkingsEach device shal
30、l have the following information marked on it. The information shall be visible after the device has been installed:a. Name or trademark of manufacturerb. Model number of the devicec. Date of manufacture or serial number or other marking consistent with the manufacturers standard practiced. Rated wo
31、rking pressure rangee. Water temperature rangef. A device that has an atmospheric vacuum breaker (AVB) conforming to ASSE 1001 as its method of backflow protection shall indicate the critical level of the AVB at least 1 inch (25.4mm) below the actual critical level. Text near the critical level mark
32、 shall read, “Outlet shall be no higher than critical level.” Both mark and text shall be visible after installation on the outside of the device.g. The direction of flow, if part of the outlet uses an NHT hose thread per ASME B1.20.1The markings shall be either cast, etched, stamped or engraved on
33、the device, or on a permanent label securely attached to the device.4.2 InstructionsComplete instructions for installation and operation shall be packaged with the device. Drawings or schematic sketches that would be useful to the installer shall be part of these instructions. 4.3 MaintenanceAll dev
34、ices that are intended to be tested, maintained, or repaired in the field shall have complete detailed instructions and a replacement parts listing included in the installation and operation instructions.4.4 Installation for Devices Plumbed to a Faucet with a Vacuum BreakerIn cases where an installa
35、tion involves a water source coming from a faucet with an integrated vacuum breaker device conforming to ASSE 1001 or ASSE 1011, a pressure bleed device conforming to IAPMO PS-104 shall be used to protect the vacuum breaker device.The purpose is so that continuous pressure does not adversely affect
36、the vacuum breaker device upstream of the pressure bleed device. This also protects against a cross-connection between hot and cold water migration by encouraging the user to turn off the water supply at the faucet.Chemical Dispensing Systems 7ASSE Standard #1055-2016Section V5.0 DefinitionsDefiniti
37、ons not found in this section are located in the Plumbing Dictionary (Sixth Edition) published by ASSE International.Check MemberA check member is a valve designed to stop the flow of liquid in one or more directions of flow.Free Standing DeviceA free standing device is a dispensing system which includes a supporting structure for resting on the floor.ASSE International Chapter of IAPMO, LLC18927 Hickory Creek Drive, Suite 220 Mokena, Illinois 60448Phone: 708.995.3019 Fax: 708.479.6139 http:/www.asse-plumbing.org
