UL-1767:2013 pdf free download – STANDARD FOR SAFETY Early-Suppression Fast-Response Sprinklers.
25.3 The assembly is to be immersed in water and orientated so that air bubbles indicating leakage past the extension nipple and inlet seal assembly connection point are allowed to freely escape from internal waterway of the dry sprinkler assembly. The air pressure applied to the connection point is then to be increased from 0 to 15 psig (0 to 103 kPa) within 30 seconds and then held for 30 seconds. Observations shall be made for leakage as evidenced by any air bubbles escaping from the internal portion of the dry sprinkler assembly.
26 30-Day Leakage Test
26.1 When tested as described in 26.2 — 26.4, an ESFR sprinkler shall:
a) Experience no leakage when subjected to a hydrostatic pressure of 300 psig (2.07 MPa) for 30 days;
b) Not leak when subjected to a pressure of 500 psig (3.45 MPa) or less for 1 minute following the 30 days;
c) Show no distortion or other mechanical damage following the leakage testing, as determined by visual examination.
26.2 Five samples are to be installed on a water-filled manifold maintained under a constant pressure of psig (2.07 MPa) for 30 days. The samples are to be examined during and at the end of the test period for evidence of leakage of water at the closure cap.
26.3 Following completion of this 30-day test period, the samples are to be tested to verify that they do
not leak at a pressure of 500 psig (3.45 MPa) or less. The pressure is to be increased from 0 to 500 psig (3.45 MPa) at a rate not exceeding 300 psig (2.07 MPa) per minute. The pressure is to be maintained at 500 psig (3.45 MPa) for 1 minute, and is then to be decreased to 0 psig at a rate not exceeding 300 psig (2.07 MPa) per minute.
26.4 The samples then are to be visually examined to verify there is no evidence of distortion or other mechanical damage.
27 Water Hammer Test
27.1 When tested as described in 27.2 — 27.5, an ESFR sprinkler shall:
a) Experience no leakage when subjected to 100,000 applications of a pressure surge increasing rapidly from 50 to 500 psig (0.34 to 3.45 MPa);
b) Not leak when subjected to a pressure of 500 psig or less for 1 minute, following the 100,000 cycles of water hammer; and
c) Show no distortion or other physical damage following the water hammer testing, as determined by visual examination.
27.2 Five samples are to be installed on a water-filled test line connected to a pump system that produces pressure cycles from 50 to 500 to 50 psig (0.34 to 3.45 to 0.34 MPa) at a rate of not more than 60 cycles per minute. The test piping is to be filled so that there is water at the sprinkler seat, and the pump is to be placed in operation and adjusted to produce the specified test-pressure cycle.
27.3 During the pressure cycling, observations are to be made for evidence of leakage.
27.4 Following completion of the pressure cycling, the samples are to be tested to verify that they do not leak at 500 psig (3.45 MPa) or less. The pressure is to be increased from 0 to 500 psig at a rate not exceeding 300 psig (2.07 MPa) per minute. The pressure is to be maintained at 500 psig for 1 minute, and is then to be decreased to 0 psig at a rate not exceeding 300 psig per minute.
27.5 The samples then are to be visually examined to verity there is no evidence of distortion or other mechanical damage.