WINS-NDT performs acrylic window maintenance inspections as outlined in ASME PVHO-2.  WINS inspection procedures are essential for ensuring the safe occupancy of pressure vessels during pressure cycling.  Window flaws that are inspected for are:


  • Blemish: Small flaw on the surface of a window
  • Chip: Small fracture in the window surface, typically the result from impact with a hard object
  • Crazing: Consisting of voided and orientated material formed at crack tips or inclusion particles
  • Defect: A flaw in the window usually present from the time of manufacture
  • Deterioration: A gradual breakdown of the acrylic polymer chain due to the combined effect of age, cycles, stress and environment
  • Flaw: Any imperfection in the acrylic present from manufacture or service that affects the cosmetic or structural adequacy of the window
  • Scratch: A mark on the smooth surface of a window
  • Ultraviolet Light: Radiant energy below the visible light frequency having a detrimental effect on acrylic and other polymer materials


WINS-NDT performs Ultrasonic Thickness Testing (UTT) on windows.  UTT inspections allow inspectors to determine remaining thickness without the requirement to remove the windows from their seat.  In-service thicknesses must conform to the minimum thickness designated by the original manufacturer window design certification.


WINS will also recommend repair procedures for any flawed conditions and perform mechanical property testing when required.