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|  MIL-P-17840C(SH)
furnished under supplementary or separate contracts or orders. The list is
intended as a record of recommendations of the manufacturer and purchaser at
the time of equipment drawing approval. The list of on board repair parts
actually purchased shall be prepared as required by MIL-P-15137 (see 6.5.2).
3.6.1.2.6 Review. Design drawings shall be submitted to the design
review agency for approval (see 6.4).
3.6.1.3 On one of the delivered drawings, the mechanical seal vendor
shall identify and certify the following:
(a)
Whether or not there is an adhesive or other setting compound
factory-installed on the elastomer bellows or O-ring that seals
between the mechanical seal and the impeller hub or shaft
sleeve.
The description of any such adhesive or setting compound.
(b)
Any time limit associated with that compound when installed on a
(c)
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.
The type and amount of lubricant, if any, to be used to facili-
(d)
tate axial positioning of the mechanical seal in the pump
during seal installation. The drawing shall require the manu-
facturer 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 conform to 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)
Industry and technical society specification or standard.
(b)
Federal specification or standard.
(c)
Military specification or standard.
(d)
Manufacturer's specification or standard.
3.6.2.2 Material substitions. Where materials other than those covered
by (a), (b), and (c) of 3.6.2.2.1 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 q aterial
in terms of the nearest Federal or Military specification, in order to enable
Naval repair facilities to make emergency repairs as necessary from Navy
materials stocks.
3.6.3 Drawing identification. Prime vendors 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.
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