ASME B16.44:2002 pdf free download

ASME B16.44:2002 pdf free download.MANUALLYOPERATED METALLIC GAS VALVESFOR USE IN ABOVEGROUND PIPING SYSTEMS UP TO 5 PSI.
Gas tightness tests shall be conducted on randomly selected production valves of each size and of each basic valve design. One new unused valve shall be subjected to both of the following tests. The valve shall not leak when tested as outlined under the following methods of test.
5.2.1 External Leakage. With the valve in the open position with the outlet sealed, an internal air pressure of, first, 2 in. (5 cm) water column and then 1.5 times the pressure rating shall be applied to the inlet of the valve.
The valve shall be immersed in a bath containing water at a temperature of 73°F ± 15°F (23°C ± 8°C) for a period of 15 sec. Leakage, as evidenced by the flow (breaking away) of bubbles, shall not be permitted. Other means of leak detection may be used provided the methods can be shown to be equivalent.
5.2.2 Internal Leakage Test. The valve shall then be turned to the closed position with the outlet open and the test in para. 5.2.1 repeated.
5.3 Flow Capacity
5.3.1 General. The valve shall provide a flow not less than that specified in Table 3.
5.3.2 Method of Test. A valve of each size and type shall be tested to verify the floss’ in a straight run of pipe of the size for which the valve is designated to be connected. The test shall be conducted using a compressible fluid and a technically acceptable procedure such as the Instrument Society of American Standard, Control Valve Capacity Test Procedure, ANSI/ISA S75.02.
5.4 Strength
5.4.1 Installation Torque. The valve shall be capable of withstanding, without deformation, breakage, or leakage, the turning effort as specified in Table 4.
5.4.2 Method of Test. The torque shall be applied at the wrench grip of the valve adjacent to where it is attached to the piping or tubing. Valves with one pipe connection and one tube connection shall have each end tested according to the type and size of the connection, as specified in Table 4 The torque specified shall be applied to the completely assembled valve by attaching it to a schedule 80 steel pipe fitting with threads conforming to ASME 131.201. or aluminum tubing as applicable, of suitable size. Thread lubricants or sealant shall not be used for this test.
The specified torque shall be applied for 15 ± 1 mm. With the turning force still applied, the valve shall then comply with the gas tightness tests specified in paras. 5.2.1 and 5.2.2. The torque shall then be released and the valve removed. There shall be no signs of deformation or breakage.