FLAT DISC ACRYLIC PLASTIC WINDOWS FOR MAN-RATED HYPERBARIC CHAMBERS AT 
THE USN EXPERIMENTAL DIVING UNIT 
Technical Note N-1127 
56-020 
by 
J. D. Stachiw 
ABSTRACT 
Flat disc acrylic plastic windows have been designed, fabricated, 
evaluated and delivered to EDU for replacement of glass windows used to 
date. The large (D = 6.950 inches; t = 1.650 inches) and the small 
(D, = 4,450 inches,°t = 1.040 inches) windows have been found on the 
basis of an extensive evaluation program to be more than adequate for 
man-rated service under 450 psi maximum operational pressure in steel 
flanges with D. (diameter of opening in flange) of 5.000 and 3.000 
inches. All windows were prooftested to 675 psi pressure at 120°F 
ambient temperature prior to delivery. 
re 
This document has been approved for public release 
and sale; its distribution is unlimited. 
TT 
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