UL 132-2021 pdf download

UL 132-2021 pdf download.Safety Relief Valves for Anhydrous Ammonia and LP-Gas.
29 General 29.1 The manufacturer shall provide the required production control, inspection, and test equipment. The program shall include at least the following: a) Each lot of pressure-relief valve springs shall be subjected to a quality-control program that shall include a check on material, dimensions, and loading or deflection, and shall also include the use of a spring-testing instrument. b) Valve parts shall be inspected for defects in workmanship, variations in essential dimensions, and uniformity of threads. c) After assembly, each valve shall be adjusted by the manufacturer for the predetermined start-to- discharge pressure as specified in (d) and (e). The adjusting means shall then be sealed to reduce the likelihood that the adjustment will be unintentionally changed and to discourage tampering. d) Safety valve shall be adjusted for a start-to-discharge pressure within ±3 % of the average start- to-discharge pressure on which the flow capacity of the valve was based, but the setting shall not be less than 100 % nor more than 110 % of the set pressure marked on the valve. e) A hydrostatic relief valve shall be adjusted for a start-to-discharge pressure within ±5 % of the set pressure marked on the valve.
30 General 30.1 Each valve shall be legibly and permanently marked to show: a) The manufacturer’s or vendor’s name or trademark. b) A catalog number or similar identification to specifically identify the valve. c) The predetermined set pressure in psig. 30.2 Each safety valve shall also be legibly and permanently marked to show: a) The flow capacity in cfm (m 3 /min) of air at a temperature of 60.8 °F (16 °C) and at a pressure of 14.7 psig (101.4 kPa). The word “Air” shall appear as a suffix to the numerical flow capacity. See 30.3. b) The month and year the valve was assembled and adjusted. 30.3 With reference to 30.2(a), a safety valve marked “250 – 4050 Air,” for example, indicates that the valve has a set pressure of 250 psig (1724 kPa) and that its flow capacity under test conditions is 4050 cfm (114.7m 3 /min) of air.
30.4 When a safety valve is installed in a multiple-head unit or a manifold by the manufacturer and is flow-tested upon installation, the marking required by 30.1 and 30.2 shall appear on the head unit or manifold. 30.5 When a manufacturer produces valves at more than one factory, each valve shall have a distinctive marking to identify it as the product of a particular factory. 30.6 Valves constructed using pipe thread in accordance with the Exception to 9.2 shall be provided with a tag, label, or similar marking on the product or smallest unit package, identifying the pipe thread type for the installer. This marking is not required to be permanent. 30.7 If an accessory is intended to be field-installed and is not shipped with the relief valve, the relief valve shall be provided with a tag, label, or similar marking on the product or smallest unit package that includes the following or equivalent statement: “For use only with (manufacturer’s name) (model or catalog number) relief valve.” This marking shall be repeated in the manufacturer’s instructions accompanying the accessory. Also, the accessory shall be provided with a tag, label, or similar marking on the product or unit package that includes the following or equivalent statement: “For use only with (manufacturer’s name) (model or catalog number) relief valve.”
31 Manufacturer’s Instructions 31.1 An accessory intended to be field-installed shall be provided with legible installation, operation, and, as applicable, user-maintenance instructions. These instructions shall be shipped in printed format with the accessory. The instructions may also be provided on the manufacturers’ website, with relevant QR code and statement “Scan QR code or visit manufacturer’s website for installation instructions” or equivalent or a statement may be provided indicating where to find instructions on the manufacturer’s website. 31.2 The instructions in 31.1 shall be preceded by the statement “IMPORTANT INFORMATION – FOLLOW ALL INSTRUCTIONS” in bold text minimum 1/2 in (12.7 mm) high and shall contain, at minimum, the information listed in 31.3 – 31.7, in text minimum 1/8 in (3.2 mm) high. 31.3 General information shall include, but is not limited to, assembly, installation, and use with details for preparation, tank handling, and inspection and maintenance recommendations.UL 132-2021 pdf download.