ASME PVHO Testing Certification

All pressure vessels and acrylic windows must be pressure tested in accordance with the ASME PVHO-1 requirements. Complete pressure test requirements are described in the ASME PVHO-1 Manual in Section 2-7.

The basic rules are:

  1. Each window must be tested at least once before going into service
  2. The window is to be tested in the chamber, or in a test fixture with seat dimensions, retaining ring and seals identical to the chamber.
  3. The test can be done with gas or water
  4. The pressure is to be held at the design pressure for a minimum of 1 hour followed by a depressurization rate of less than 650 psi/minute.
  5. The temperature during the test shall be the design temperature for which the window is rated with a tolerance of +0/-5°F

PVHO and ABS Hydrostatic Pressure Testing


Post Hydrostatic Test Inspection of PVHO and window under ABS Survey

Signature of PVHO Form VP5 by ABS after successful test