Section 7 Testing and inspection

7.1.1 Each window shall be pressure tested at least once prior to being put into service.

7.1.2 The window may be pressure tested together with the chamber after installation into the chamber or placed within a test fixture whose window seat dimensions, retaining ring, and the seals are identical to the chambers in which case the test pressure is to be the design pressure for the chamber. In no case must the test pressure exceed 1,5 times the design pressure or 138 N/mm², whichever is the lesser value. During this test, the temperature of the pressurising medium should be the design temperature of the window. An alternate test procedure in excess of design pressure and lower temperature may be adopted as specified in ASME PVHO-1 within the limitations indicated. The test pressure shall be maintained for a minimum of one hour but not more than four hours. The test may be carried out using a test fixture whose window seat dimensions, retaining rings and seals are identical to those of the chamber.

7.2.1 After completion of pressure tests the window shall be visually inspected for the presence of crazing, cracks or other permanent damage.

7.2.2 The presence of crazing, cracks or other permanent damage shall be cause for rejection of a window. PVHO-1 may be used for guidance.

7.2.3 For further information see Safety Standard for Pressure Vessels for Human Occupancy ANSI/ASME PVHO-1, latest edition.