ANSI Z21.24:2006 pdf download.Connectorsl For Gas Appliances.
2.3.2 The connector shall withstand for 5 minutes, without leakage and without becoming detached, a steady lenglhwme pull oF 800 lb/in (140.2 N/mm) of nominal inside diameter.
Method of Test
One end of a 1 It (305 mm) connector shall be securely attached to a lixed 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 800 lb/in (140.2 N/mm) of nominal inside diameter can be applied.
The required tension shall be applied to the connector and maintained for 5 minutes. At the end of 5 minutes, there shall be no leakage.
2.4 Bending
ibe connector shall withstand 30 bends without leakage or damage to the tubing or fittings.
Method of Test
One end of a 2 ft (610 mm) connector shall be securely attached to a fixed pipe to which an air supply system and manometer Is connected. The other end shall be dosed gastight. Two 2’/4 In (57.2 mm) diameter mandrels shall be placed, one at each side of the fixed end of the connector, in contact with the connector nut. The center of the mandrets shall be in line with the tubing end of the nut.
Air shall then be admitted to the connector until a pressure equivalent to 3 psi (20.7 kPa) is obtained. The tubing shall be bent from the starting position A” along the path shown by the dotted circle in Figure 3, Illustration of Bending Test, to the position indicated by “B.” It shall then be bent back to the starting position and bent in the opposite direction to position
C. Each 180 degree (3.14 rad) bend and subsequent return to the starting position shall be counted as one cyde, This process shall be repeated until 30 cycles have been completed, the bending motion being applied uniformly at the rate of 5 cycles per minute.
Following completion of the 30 bends, the connector shall not leak. This test shall be applied to each nominal diameter, type and material of connector submitted.
2.5 Torsion
The connector shall withstand, without leakage or damage to the tubing or Fittings, 15 applications of 90 degree (1.57 rad) twists In alternate directions.
Method of Test
One end of a 2 ft (610 mm) connector shall be securely attached to a rigid frame and loaded in tension as specified in Table V, Applied Load During Torsion Test.
An air pressure equivalent to 3 lb/in2 (20.7 kPa) shall be maintained in the system while the tubing is rotated 90 degrees (1.57 rad) at the lower fitting, in a plane peq,endicular to the axis of the tubing, and then returned to the original position and rotated 90 degrees (1,57 rad) in the opposite direction. Each 90 degree (1.57 rad) twist and subsequent return to the original position shall be counted as one cycle, and the twisting motion shall be apphed uniformly at a rate of 5 cycles per minute. The connector shall not leak. This test shall be applied to each nominal diameter, type and material of connector submitted.
2.6 Durability At High Temperature
2.6.1 The connector shall withstand a temperature of 800F (427’C) without leakage.
During this test, a manual valve supplied as an end connection shall be removed and replaced with a plug.
Method of Test
A 1 ft (305 mm) connecto- shall be connected to a pressure-tight system. Thermocouples shall be soldered, brazed or otherwise firmly attached to end fittings to determine their temperature. The connector shall then be placed in a preheated oven. When the temperature of the fitting reaches 790F (421 CC), the oven temperature shall be adjusted that the temperature of the fittings does not exceed 810’F (432’C) or drop below 790F (421 C) in the succeeding 15 minutes. An internal air pressure of 3 ± 0.25 lb/in2 (20.7 ± 1.7 kPa) shall be maintained throughout the test, unless a drop in pressure occurs. In this event the test shall be discontinued. Otherwise, the connector shall be removed from the oven, cooled to room temperature and shall not leak.
2.6.2 A connector employing a protective coating shall be capable of withstanding a temperature of
300’F (1 49”C) without leakage,
Method of Test
A connector employing a protective coating shall comply with this test with its protective coating.
A fully assembled 1 ft (305 mm) connector shall be connected to a pressure-tight system. Thermocouples shall be soldered, brazed or otherwise firmly attached to end fittings to determine their temperature. The connector shall then be placed in a preheated oven. When the temperature of the fittings reaches 290F (143.5CC), the oven temperature shall be adjusted so that the temperature of the fittings does not exceed 31 0-F (154.5°C) nor drop below 290-F (143.5°C) in the succeeding 24 hours. An internal air pressure of 3±0.25 psi (20.7 ± 1,7 kPa) shall be maintained throughout the test, unless a drop in pressure occurs In this event the test shall be discontinued, Otherwise, the connector shall be removed from the oven alter 24 hours, cooled to room temperature, and shall not leak.
