MIL-DTL-2845E (SH)
3.7 Preservation.
Preservation shall be level A or commercial, as
specified (see 6.2).
3.7.1 Cleaning and drying. Unless otherwise specified herein, items
shall be cleaned and dried by any suitable process or processes which are not
injurious to the item or as specified herein.
3.7.2 Preservation. Immediately after product cleaning and drying,
surfaces of the equipment or part shall be treated with a preservative as
specified in table I, or as specified herein. During and after preservative
application, the product shall be handled in such a manner as to produce a
uniform protective film. The protective film shall remain untouched for a
period of time to allow the film to set before wrapping and packing are
undertaken. Preservative shall not be applied to items or surfaces which are
vulnerable to damage by the preservative and in accordance with
MIL-STD-2073-1C. Excessive use of preservatives shall be avoided.
3.7.2.1 External metal surfaces. Items shall be preserved as specified
in table I. Preservatives for external metal surfaces shall be in accordance
with MIL-STD-2073-1C. The use of preservatives in accordance with
MIL-PRF-16173, grades 1 and 4 shall be limited to surfaces where it will not
have to be removed to place the equipment in operation, or where its removal
by scraping or solvent action would not damage the part or equipment.
3.7.2.2 Internal metal surfaces. Internal metal surfaces which
normally are in contact with oil shall be coated with a preservative in
accordance with MIL-PRF-16173, grade 2. Internal metal surfaces normally in
contact with water shall be coated with a preservative in accordance with
MIL-PRF-16173, grade 3 or MIL-PRF-16173, grade 5. The MIL-PRF-16173, grade 5
preservative shall be used when chemical boil-out cannot be used for compound
removal, or where removal by hot water or steam is desired.
3.7.2.3 Finished machined surfaces. Unless otherwise specified herein,
external finished machined steel surfaces protected with a preservative (see
table I) shall be wrapped with barrier material in accordance with MIL-B-121,
type I, grade A, class 2, followed by an overwrap with type I, grade C, class
1 or 2, with class selection at the activities option.
3.7.2.4 Closure of openings. Unless otherwise specified herein,
openings shall be sealed with tape in accordance with ASTM D 5486, or a
minimum 0.004 inch thick polyethylene film secured with tape as specified
herein. When the covering is vulnerable to damage (puncture, tearing, and so
forth) the covering shall be further protected by use of weather-resistant
hardboard, wood, plywood, or metal covers. Pipe and fitting ends may be sealed
with metal or plastic caps or plugs.
3.7.2.5 Electrical and electronic equipment. Preservation, packing, and
marking shall be in accordance with MIL-E-17555.
3.7.2.6 Pumps and associated parts. Preservation, packing, and marking
shall be in accordance with MIL-P-16789.
3.7.2.7 Accessories and detached parts. Unless otherwise specified
herein, accessories and detached parts shall be preserved as specified in
table I. Except as specified in table I, and in order to facilitate
packaging, accessories such as thermometers, sight glasses, and route
connectors shall be individually preserved in accordance with MIL-S-196 or the
applicable component specification. Unless otherwise specified (see 6.2),
accessories accompanying equipment, preserved as specified herein, shall be
packed in separate containers and secured within the complete or main (number
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