ASME A112.1002:2020 pdf download

ASME A112.1002:2020 pdf download.Anti-siphon fill valves for water closet tanks
1 Scope
1.1 This Standard covers anti-siphon fill valves intended to be installed in water closet tanks. Note: In this Standard, anti-siphon fill valves are also referred to as “devices”. 1.2 In 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; “should” 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 accompanying 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 (non-mandatory) to define their application. 1.3 SI units are the units of record in Canada. In this Standard the inch/pound units are shown in parentheses. The values stated in each measurement system are equivalent in application; however, each system is to be used independently. Combining values from the two measurement systems can result in non- conformance with this Standard. All references to gallons are to U.S. gallons.
2 Reference publications and definitions
2.1 Reference publications This 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 (American Society of Mechanical Engineers)/CSA Group ASME A112.18.1-2018/CSA B125.1-18 Plumbing supply fittings ASME A112.19.2-2018/CSA B45.1-18 Ceramic plumbing fixtures ASME (American Society of Mechanical Engineers) ASME B1.1-2003 (R2018) Unified Inch Screw Threads, (UN and UNR Thread Form) ASSE International ASSE Plumbing Dictionary, Sixth Edition, 2007 2.2 Definitions In addition to the definitions in ASME A112.18.1/CSA B125.1 and the ASSE Plumbing Dictionary, the following definitions shall apply in this Standard: Anti-siphon fill valve — a valve that is used to supply water for flush tank refill and, where applicable, trap reseal. The device has an air gap, integral mechanical backflow preventer, or vacuum breaker to prevent the backflow of water from the flush tank into the supply system. The device is operated by a float or similar activation method. Retrofit device — any replacement fill valve not specifically supplied by the original equipment manufacturer of the water closet tank.
4 Performance requirements and test methods
4.1 General Tests shall be conducted in the order in which they are listed in this Standard on one test specimen. 4.2 Preconditioning and test conditions 4.2.1 Preconditioning Before testing, the device shall be conditioned at ambient laboratory conditions for not less than 12 h. 4.2.2 Test conditions Unless otherwise specified in this Standard, tests shall be conducted at ambient laboratory conditions. 4.3 Test specimen installation For test purposes, specimens shall be installed in accordance with the manufacturer’s instructions. 4.4 Pressure and temperature tests 4.4.1 Pressure and temperature cycling test 4.4.1.1 Purpose The purpose of the elevated pressure and temperature cycling test is to a) evaluate the performance of the device at elevated temperatures and pressures; and b) ensure that the device has a means for securing the refill tube to the overflow tube and that it remains in place during the test. 4.4.1.2 Procedure The elevated pressure and temperature cycling test shall be conducted as follows: a) Install the specimen in a tank in accordance with the manufacturer’s instructions. b) The water in the tank may be displaced to accelerate the test, provided the flush volume range given by Clause 4.4.1.2 c) is maintained.