ANSI Z21.75:2007 pdf download.Connectors For Outd loor Gas Appliances And Manufactured Homes.
2.1 General
2.1.1 Unless otherwise specified, a connector employing a nonmetallic protective coating shall comply with the provisions of this standard without its protective coating.
2.1.2 During tests for compliance with this standard, unless otherwise specified, connections shall be made using a torque of 1040 in/lb (117.50 N-rn) per inch of nominal connector ID.
2.1.3 Unless otherwise specified, all tests for leakage in Part II shall be made consistent with section
2,2, Leakage.
During tests for compliance with this standard, unless otherwise specified, examination for leakage shall be conducted with one end of the connector attached to a pneumatic system capable of supplying clean dry air at 3 psi (20.7 kPa) pressure. This system may terminate in a stationary pipe to support the connector as specified in certain tests, or in suitable pneumatic tubing if the connector is to be moved as specified ii other tests. A pressure measuring device such as a manometer and a flow measuring device capable of accurately indicating the allowable flow rate shall be located downstream from a shutoff valve provided to isolate the connector under test from the pneumatic system. The other end of the connector shall be sealed gastight. Air shall then be admitted to the connector until a pressure equivalent to 3 psi (20.7 kPa) is obtained.
Compliance with leakage tests shall be determined by one or more of the following, as specified in the Method of Test for each provision.
a. Any leakage, as determined by a sudden drop in pressure as indicated by the pressure measuring device, after the shutoff valve has been closed, shall be cause for failure.
b. The flow measuring device shall be observed and no indication of leakage In excess ol 10 cm3/hr of air corrected to 30 in Hg column (101,3 kPa) and 60’F (1 5.5CC) shall be noted.
2.1.4 References in this standard to the inlet and outlet ends of a connector are for convenience only. It is recognized that the two ends may be identical or interchangeable.
2.2 Leakage
A connector and its fittings shall not leak. For the purpose of this section, leakage is defined as a flow rate in excess of 10 cm/hr at 3 psi9 (20.7 kPa).
Method of Test
This test shall be conducted at room temperature.
One end of the connector shall be connected to a flow-measuring device, capable of accurately indicating the allowable flow rate, and a pneumatic system capable of supplying clean air at a test pressure of 3 lb/in2 (20.7 kPa). An airtight connection shall be made at the opposite end of the connector.
The applied pressure shall be maintained for 1 minute. If no bursting or evidence of leakage occurs during this period, this provision shall be deemed met.
2.3.2 A connector shall withstand, without evidence of leakage or becoming detached, a lengthwise pull of 800 lb/in (3.56 kN) of nominal connector l.D.
Method of Test
A ne unused connector shall be used for this test.
One end of a 2 ft (610 mm) connector shall be securely attached to a stationary pipe to which an air supply system and pressure gage is connected, The other end shall be securely attached in a similar manner to a closed pipe connected to a mechanical means by which a constant pulling force of the necessary magnitude can be applied.
The required tension shall be applied to the connector and maintained for the duration of the test. At the end of 5 minutes the connector shall be subjected to 3 psi (20.7 kPa) air pressure. The air shall then be shut off, and there shall be no leakage as evidenced by the pressure gage during a period of 1 minute thereafter (see 2.1.3-b).
2.3.3 A connector shall be sufficiently resistant to crushing to support a transverse load of 75 lb per linear in (1.35 kg/mm) without loss of capacity beyond that specified in the following Method of Test and without developing leakage.
Method of Test
This test shall be conducted after the capacity of a 6 ft (1.83 m) connector has been determined as specified in 2.9, Capacity.
The connector shall be laid on a hard, flat, smooth surface and a 75 lb (34.0 kg) weight with ‘/ in (1.59 mm) radiused edges and a smooth metallic face I in (25.4 mm) wide shall be applied for 1 minute without impact in tum to 3 places selected along the length of the connector, none of which is closer than 3 in (76.2 mm) to either of the end fittings.
