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|  MIL-D-18641F(SH)
422 Extension of qualification Qualification of type I, II or III units will be considered as
qualifying type IV or V units. Qualification of type V units will be considered as qualifying type I
units.
43 Tests.
43.1 Pressure tests. Parts of the plant shall be subject to hydrostatic pressure test as specified
in table XI.
43.1.1 Hyrostatic pressure. Parts of distilling units for submarine installations which are
exposed to submergence pressure shall be subjected to hydrostatic pressure equal to the specified
submergence test pressure (see 6.2). After installation of tubes, a hydrostatic test pressure equal
to the specified submergence test pressure shall be applied to the spare between the double tube
sheets. Any leak appearing at the tube end where tubes are expanded into the outer tube sheet
shall be corrrected by re-rolling the individual leaking tube end. After this test, a hydrostatic
pressure in the shell as specified in 4.3.1 shall be applied with the drain connection to the space
48
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