Hydrostatic Proof Test

As specified by AWWA C151, each pipe is subjected to a hydrostatic test of not less than 500 psi with the pipe under the full test pressure for at least 10 seconds. Suitable controls and recording devices are provided so that the test pressure and duration are positively controlled. Any pipe that leaks or does not withstand the test pressure is rejected.

For even greater assurance of pipe quality, each 30" and larger AMERICAN Ductile Iron pipe is hydrostatically tested to 75% of yield strength of the metal, based on the nominal thickness of the pipe. As an example of the higher test pressures this dictates, each length of 30" diameter ductile iron pipe, Class 150 (the lightest class produced), 0.34" nominal wall, is tested to 669 psi. See Table 3-2 (below) for a listing of AMERICAN's hydrostatic tests on 30" and larger pressure class pipe. Contact AMERICAN if higher test pressures are desired.

Each 30" and larger diameter AMERICAN Ductile Iron pipe is hydrostatically tested to 75% of yield strength which results in higher test pressures than those required by AWWA C151, varying to over 900 psi, depending on size and thickness of the pipe.

AMERICAN Ductile Iron Pipe
Hydrostatic Proof Test Pressures
30"-64" Pressure Classes

ADIP Table No. 3-2

Size in.	Outside Dia- meter in.	Pressure Class
		150		200		250		300		350
		Wall Thick- ness in.	Test Press- ure psi	Wall Thick- ness in.	Test Press- ure psi	Wall Thick- ness in.	Test Press- ure psi	Wall Thick- ness in.	Test Press- ure psi	Wall Thick- ness in.	Test Press- ure psi
30	32	0.34	669	0.38	748	0.42	827	0.45	886	0.49	965
36	38.3	0.38	625	0.42	691	0.47	773	0.51	839	0.56	921
42	44.5	0.41	580	0.47	665	0.52	736	0.57	807	0.63	892
48	50.8	0.46	570	0.52	645	0.58	719	0.64	794	0.7	868
54	57.56	0.51	558	0.58	635	0.65	711	0.72	788	0.79	865
60	61.61	0.54	552	0.61	624	0.68	695	0.76	777	0.83	849
64	65.67	0.56	537	0.64	614	0.72	691	0.8	767	0.87	835

Notes:
These pressures produce a 31,500 psi stress in the pipe wall (which is equal to 75% of the 42,000 psi minimum yield strength for ductile iron pipe) based on outside diameter and total standard thickness. Test pressure = 2 x T x 31,500/O.D.