Windows for External or Internal Hydrostatic Pressure Vessels. Part VI. Conical Acrylic Windows under Long-Term Pressure Application at 5,000 Pse.
Technical rept. Mar 69-Oct 70,
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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Conical acrylic windows with five included angles from 30 to 150 degrees and thickness- to-minor-diameter tD ratios from 0.375 to 1.00 have been subjected to 5,000 psi of sustained hydrostatic loading for up to 1,000 hours in the temperature range from 65 to 75 F while the axial displacement of the windows through the flange has been monitored. The magnitude of axial displacement was found to be a function of angles tD ratio, temperature, and duration of loading. Only windows with tD ratios equal or greater than 1.000, 0.625, 0.500, and 0.500 for 30-, 60-, 90-, 120-, and 150- degree conical angles, respectively, were found to be free of cracks. Minimum axial displacements of the windows can be achieved only with tD ratios of greater than 1.000, 1,000, 0.750, 0.750, and 0.625 for 30-, 60-, 90-, 120-, and 150-degree conical angles, respectively. The minimum axial displacements of D 1.000-inch windows with these tD ratios and conical angles are 0.042, 0.023, 0.023, 0.019, and 0.019 inch, respectively. It is recommended that only windows with tD ratios equal or greater than 0.625 and equal or greater than 60 degrees be used for sustained hydrostatic loading of 5,000 psi at temperatures equal or less than 80 F. Author, modified-PL
- Marine Engineering