Shower Hose Assembly Test Standard
--Test mostly according to “ASME A112.18.1-2005/CSA B125.1-05” standard
Before the thermal cycling test is begun, the fittings or component parts of fittings shall be examined and any surface imperfections, such as small mould imperfections, shall be noted. These surface imperfections shall not be considered failures after the thermal cycling test unless they develop into surface defects.
Under dry conditions, the specimens shall be subjected consecutively to four complete cycles of temperatures, with each complete cycle consisting of the following steps in the following order:
(a) –40 ± 2 °C (–40 ± 4°F) for 20 min to 1 h;
(b) 20 ± 5 °C (68 ± 9°F) for a minimum of 20 min;
(c) 75 ± 2 °C (167 ± 4°F) for 20 min to 1 h; and
(d) 20 ± 5 °C (68 ± 9°F) for a minimum of 20 min.
The temperatures specified in Items (a) to (d) shall be measured within 50 mm (2 in) of the centre of the location of the specimens. Temperature ramping shall be permitted for achieving the temperatures
specified in Items (a) to (d). For the steps specified in Items (a) and (c), the temperature ramping time (if any) plus the time during which the specimen is at the specified temperature (a minimum of 20 min) shall
not exceed 1 h.
During the testing, there shall be free circulation of air around the specimens, and most of their surface area shall not be in contact with other specimens or with the holding container
Hose assemblies shall be tested at a hydrostatic pressure of 690 kPa (100 psi) for 1 h, followed by a burst pressure test of 2000 kPa (290 psi) for 1 min using water at 10 ± 6 °C (50 ± 10°F).
Hoses shall be subjected to a 67 N (15 lbf) tension test for 10 000 cycles, with the force applied gradually at the end of the hose connector.
Following the completion of the test specified in Clause 18.104.22.168, the hose shall be bent for one complete turn around a mandrel 50 mm (2.0 in) in diameter. The end connections of the hose shall then be pulled until a force of 67 N (15 lbf) is applied, or until the hose comes fully into contact with the mandrel, whichever occurs first. The hose and the end connections shall not leak when tested in accordance with Clause 22.214.171.124.
The end connections of hoses shall not pull out when an axial force is applied and increased to 334 N (75 lbf) by extending the hose at a rate not faster than 127 cm (50 in) per minute and then maintained for 15 s.
|5.7||Thread torque strength：|
Metal threaded connections shall withstand the torque load specified in Table 4 without evidence of
cracking or separation. The torque shall be applied with a torque wrench that has a maximum allowable
inaccuracy of 3% of the full-scale reading. This test shall apply to NPT and NPSM supply connections only.
Thread torque strength
The test to determine the presence of hidden check valves in single-outlet fittings with a submersible outlet shall be conducted as follows:
(a) Mount the specimen in accordance with Clause 126.96.36.199.3.
(b) Open Valve 3.
(c) Apply and hold a vacuum of 85 kPa (25 in Hg) for 5 min.
(d) Close Valve 3, gradually open Valve 2, and allow the pressure on the supply side of the specimen device to gradually return to atmospheric.
(e) Close Valve 2 and gradually open Valve 3.
(f) Gradually raise the vacuum test load from 0 to 85 kPa (0 to 25 in Hg) and then gradually reduce it to 0 kPa (0 in Hg).
(g) Create a surge effect by quickly opening and closing Valves 2 and 3 at least five times. The applied vacuum load shall vary from 0 to 85 to 0 kPa (0 to 25 to 0 in Hg) during the test.