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|  MIL-P-17639F(SH)
Any time limit associated with that compound when installed
(c)
on a mechanical seal in stowage and any time limit between
initial wetting of that compound and the final positioning
of the mechanical seal in the pump.
(d)
The type and amount of lubricant, if any, to be used to
facilitate axial positioning of the mechanical seal in the
pump during seal installation. The lubricant shall be
silicone compound in accordance with MIL-S-8660, and all
elastomers , O-rings, or seals shall be compatible with the
silicone compound. The drawing shall require the manufac-
turer to use that lubricant during pump assembly.
3.6.2 Material identification.
3.6.2.1 Preferred material reference. Where materials of identical or
equal quality can be identified by more than one specification or standard,
the drawings need reference only one such specification or standard. In
selecting the specification or standard to be referenced the following is the
order of preference:
(a)
Federal specification or standard.
(b)
Military specification or standard.
(c)
Industry and technical society specification or standard.
(d)
Manufacturer's specification or standard.
3.6.2.2 Material substitutions. Where materials other than covered by
(a), (b), and (c) of 3.6.2.1 are referenced and approved by the design review
agency, the drawings shall show the complete chemical and physical properties
of the approved material. In addition, the drawings shall identify the mate-
rial in terms of the nearest Federal or Military specification, in order to
enable Naval repair facilities to make emergency repairs as necessary from
Navy material stocks.
3.6.3 Drawing identification. Prime contractors who purchase items
from subcontractors shall use the subcontractor's drawing number as the single
reference identification in all cases where the parts delineated thereon are
produced by the subcontractor. The prime contractor shall not add his drawing
number to the drawing except as an unofficial reference outside the drawing
border or margin.
3.6.3.1 Prime contractors who purchase semi-finished parts from subcon-
tractors for final production, test or selection phases in their own shops, have
the option of using as the single drawing identification either their own title
block and drawing number or the title block and drawing number of the subcon-
tractor, but not both.
3.6.4 Drawings of drivers and associated equipment shall be in accordance
with the specifications covering those equipments.
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