150- 100- PVHO- RT- 21- 75
Year of fabrication
Fabricator's window serial number
Fabricator's name or identification symbol
Pressure Vessel for Human Occupancy
Maximum temperature, deg. F
Design pressure, psig
7.
WINDOW DESIGN. The acrylic plastic windows in pressure vessels for
human occupancy should have one of the standard geometries shown in Figure
3-11. Minimum acceptable thickness and slenderness ratios should comply with
the requirements of Figure 3-11 for the specific window geometry. Laminating
several sheets of acrylic plastic to arrive at the desired window thickness
is not permitted.
a. Joining of acrylic plastic castings by bonding is acceptable
providing that:
(1)
The joint should see in service only membrane compressive
stresses.
(2)
The tensile strength of the bond should be at least 50
percent of the parent material strength as established by ASTM-D-638 test on
5 tensile coupons cut from a bond quality control specimen that was bonded at
the same time and in the same manner as the acrylic castings intended for
actual service.
(3)
The total cross sectional area of inclusions, plus voids,
should be less than 5 percent of the total bonded joint cross section and
less than 10 percent of the bonded joint cross section in any 1 inch (25 mm)
length of the joint.
(4)
The joint must be pressure tight during hydrostatic testing
of the window.
b. Windows of other geometries may be proposed for use in pressure
vessels for human occupancy providing that the experimental and analytical
data substantiating the new window design parameters are submitted for review
and are accepted by the ASME Safety Codes Committee on Pressure Vessels for
Human Occupancy, or the NAVFAC System Certification Authority.
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