Section 178.356-3 - Tests(a) Leakage test-Each inner liner assembly must be tested for leakage prior to installation. Seam welds of the liner must be covered for a distance of at least 15 cm (6 inches) on either side of the seam with soapsuds, heavy oil, or equivalent material, and interior air pressure applied to at least 776 mm Hg (15 p.s.i.g.) above atmospheric pressure must be held for at least 30 seconds. Liners failing to pass this test may not be used until repairs are made, and retests successfully passed.Amdt. 178-35, 39 FR 45247, 12/31/1974. Redesignated by Amdt. 178-97, 55 FR 52716, 12/21/1990; 66 FR 45387, 8/28/2001; 67 FR 61016, 9/27/2002