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|  MIL-D-18641F(SH)
3.25 identification plates. Identification plates of sheet or cast brass or bronze shall be
provided in accordance with MIL-P-15024 and MILP-15024/5. Identification plate data shall include
the following:
a. Manufacturer's name
b. Government contract number
c. National stock number (allow 17 spaces)
d. Date of manufacture
e. Blank space for Government inspector's stamp
f. Blank space for unit number (two spaces, stamped by shipyard).
3.26 Special tools. Special tools for maintenance of the distillation units shall be furnished
on a per ship basis. Such tools shall include a special device for removal of the vertical basket of
type III units, one tube expander of each size and type necessary for expanding the tubes of double
tube sheet heat exchangers, and a permanent tube plugging tool set (See 3.26.1) for saturated
steam propelled ship seawater feed heaters.
3.26.1 Permanent tube plugging tool set For saturated steam propelled ship distilling plants,
permanent tube plugging tool sets shall be furnished as specified (see 3.26) for surface ships, and
(see 6.2) for submarines. Tool sets shall be based on the following
a. Tools shall be provided for removing the tube end from the hole in the outer tube
sheet, across the space between the double tube sheets and for finishing the tube end
flush with the outer face of the inner tube sheet free from burrs. Tools shall also be
provided for expanding the permanent tube plugs (see b) into the tube hole in the
outer tube sheet and into the tube end in the inner tube sheet. Such tools shall be
arranged for power operation.
b. Permanent tube plugs shall be fabricated from the stock of same material as the heat
exchanger tubes and of proper gauge so that, when turned down to fit inside the tube
end in the inner tube sheet, the wall thickness will be not less than that of the heat
exchanger tubes. An end plug in accordance with MIL-C-15726, composition 70-30 or
90-10 as applicable, shall be welded into the small diameter end of the tube plug.
Alternatively, the permanent tube plugs may be machined from bar stock in accordance
with MIL-C-15726, composition 70-30 or 90-10 as applicable, with above limitation as
to wall thickness. Each permanent plug shall pass the inspections specified in 4.7.
c. Tapered phenolic tube plugs in accordance with MIL-P-15742 shall be provided for
plugging the open end of the permanent tube plug after the permanent plug has been
installed and the installation proved satisfactory.
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