Accession Number : AD0736594

Title :   Windows for External or Internal Hydrostatic Pressure Vessels. Part VI. Conical Acrylic Windows under Long-Term Pressure Application at 5,000 Pse.

Descriptive Note : Technical rept. Mar 69-Oct 70,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Stachiw,J. D. ; Gray,K. O.

Report Date : NOV 1971

Pagination or Media Count : 66

Abstract : Conical acrylic windows with five included angles from 30 to 150 degrees and thickness- to-minor-diameter (t/D) 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 t/D ratio, temperature, and duration of loading. Only windows with t/D 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 t/D 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 t/D 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 t/D 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)

Descriptors :   (*ACRYLIC RESINS, HYDROSTATIC PRESSURE), (*UNDERWATER VEHICLES, *TRANSPARENT PANELS), PRESSURE VESSELS, CONICAL BODIES, PRESSURIZATION, DEFORMATION, TOLERANCES(MECHANICS), LOADS(FORCES), TEST METHODS

Subject Categories : Plastics
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE