12.—(1) The water system shall be capable of withstanding an internal water pressure not less than 1½ times the maximum pressure to which the installation or relevant part is designed to be subjected in operation ( “the test pressure”).N.I.
(2) This requirement shall be deemed to be satisfied—
(a)in the case of a water system that does not include a pipe made of plastics, where—
(i)the whole system is subjected to the test pressure by pumping, after which the test continues for one hour without further pumping;
(ii)the pressure in the system is maintained for one hour; and
(iii)there is no visible leakage throughout the test;
(b)in any other case, where either of the following tests is satisfied—
| TEST A | TEST B |
|---|---|
(i) the whole system is subjected to the test pressure by pumping for 30 minutes, after which the test continues for 90 minutes without further pumping; (ii) the pressure is reduced to one third of the test pressure after 30 minutes; (iii) the pressure does not drop below one third of the test pressure over the following 90 minutes; and (iv) there is no visible leakage throughout the test. | (i) the whole system is subjected to the test pressure by pumping for 30 minutes, after which the pressure is noted and the test continues for 150 minutes without further pumping; (ii) the drop in pressure is less than 0.6 bar (60kPa) after the following 30 minutes, or 0.8 bar (80kPa) after the following 150 minutes; and (iii) there is no visible leakage throughout the test. |
Commencement Information
I1Sch. 2 para. 12 in operation at 3.8.2009, see reg. 1(1)