BS 750:2006 pdf download.Specification for underground fire hydrants and surface box frames and covers.
11.3.1 Ten sample outlets shall be subjected to the test method of A. 1.
11.3.2 Five of these samples when subjected to the procedure of A. 1.3.1 shall have exhibited a maximum angular deflection of not greater than 7.5° and shall have a residual angle of (leflection of not greater than 2°. both measured from the unloaded datum position.
11.3.3 The samples. in addition, shall exhibit no fractures and shall not. have suffered damage so as to prevent subsequent reconnection of the stan(l)ipe.
11.3.4 The remaining five samples when subjected to the test method of A.1.3.2 shall exhibit no leakage during the test.
11.4 Strength and leak-tightness requirements of type 2a and type 2d screwed outlets: Resistance of screwed outlets to rotational force
Outlets shall be tested in accordance with A.2. The following shall apply.
a) There shall be no visually detectable movement of the outlet occurring during the application of the initial (50 ± 2.5) Nm torque in either direction.
b) Outlets shall withstand a torque of (300 ± 15) Nm applied in both clockwise and anticloekwise directions for a minimum of 30 s whilst subjected to the pressures specified with no visible signs of leakage at the outlet/body joint for the duration of the tesi.
c) There shall be no damage that would impair subsequent performance of the hydrant or connection of a standpipe.
d) The total rotational movement (from fully clockwise to fully anticloekwise) (luring the application of the (300 ± 15) Nm torque shall not exceed 10.
Leakage at the outlet/body joint, when testing with only one of the security systems, shall not be deemed a failure.
11.3.2 Five of these samples when subjected to the procedure of A. 1.3.1 shall have exhibited a maximum angular deflection of not greater than 7.5° and shall have a residual angle of (leflection of not greater than 2°. both measured from the unloaded datum position.
11.3.3 The samples. in addition, shall exhibit no fractures and shall not. have suffered damage so as to prevent subsequent reconnection of the stan(l)ipe.
11.3.4 The remaining five samples when subjected to the test method of A.1.3.2 shall exhibit no leakage during the test.
11.4 Strength and leak-tightness requirements of type 2a and type 2d screwed outlets: Resistance of screwed outlets to rotational force
Outlets shall be tested in accordance with A.2. The following shall apply.
a) There shall be no visually detectable movement of the outlet occurring during the application of the initial (50 ± 2.5) Nm torque in either direction.
b) Outlets shall withstand a torque of (300 ± 15) Nm applied in both clockwise and anticloekwise directions for a minimum of 30 s whilst subjected to the pressures specified with no visible signs of leakage at the outlet/body joint for the duration of the tesi.
c) There shall be no damage that would impair subsequent performance of the hydrant or connection of a standpipe.
d) The total rotational movement (from fully clockwise to fully anticloekwise) (luring the application of the (300 ± 15) Nm torque shall not exceed 10.
Leakage at the outlet/body joint, when testing with only one of the security systems, shall not be deemed a failure.
