MIL-DTL-68G
Hot. The insulation resistance shall be at least 2 megohms when measured in accordance with 4.6.1.2.
3.20.2
3.21
Vibration. Fans shall withstand the vibration test specified in 4.6.12.
3.21.1
Fans shall be balanced in accordance with the requirements of MIL-STD-167-1, type II.
3.22
Designation and markings.
Designation of class 2 fans. For class 2 fans, the letters "NM" shall follow the type designation,
3.22.1
for example "Type TA12NM".
3.22.2
Identification plates. Identification and information plates shall be provided in accordance with
type A, B, C, D, or H of MIL-DTL-15024 and MIL-P-15024/5, except that plastic material is not per permitted and
aluminum alloy is permitted only for type H. The plates shall be installed on and furnished as a part of the
equipment for which they are intended. The plates shall be attached, with metal fasteners other than self-tapping
screws, to a part of the equipment which will not ordinarily be renewed during its normal service life and shall be
located in a readily accessible position where they can be read at all times without danger to personnel.
3.22.3
Identification plate markings. The information shown on the identification plates shall include fan
nomenclature, type, rated voltage, rated wattage, rated amperage, Hz (or the designation d.c., if applicable),
manufacturer, applicable contract number, the National Stock Number (to be shown as a fourteen character
number preceded by the designation NSN), the Component Identification Number (to be shown as a nine digit
number preceded by the designation CID), and the designation USN.
3.23
Finish. The frame, base, and where applicable, guard and blades shall be:
(a)
Given a prime coat of zinc-chromate primer, formula number 84 of TT-P-645. Finished coatings
shall be applied in accordance with formula 111, type III, class 2 of MIL-DTL-15090. For optimum
performance, the prime coat shall be applied to a near-white surface as defined in SSPC SP10; or
(b)
The surface shall be prepared in accordance with type I or type III of TT-C-490 and given one coat
each of zinc-chromate primer, formula number 84 of TT-P-645, and formula 111, type III, class 2 of
MIL-DTL-15090. Each coat shall be one mil thick when dry.
3.23.1
Final coatings shall be in accordance with MIL-DTL-15090; however, substitute paint formulations
may be used if accepted by the Naval Ship Engineering Center (NAVSEC).
3.24
Technical data. The supplier shall prepare engineering drawings in accordance with the data ordering
document included in the contract or order (see 6.2.2).
Drawings. In addition to the drawing content required by the data ordering document (see 6.2.2),
3.24.1
the unique technical features specified in 3.24.1.1 and 3.24.1.2 shall be included.
3.24.1.1
Class 1 fans. Drawings shall contain the following:
(a)
An outline drawing giving front and side view, dimensions, and mounting hole diameter and
spacing.
(b)
Brush length, width and thickness, and number of brushes per stud, number of studs,
manufacturer's and Navy grade, name of manufacturer and NSN (if applicable).
(c)
Weight of complete fan in pounds.
(d)
List of insulation materials.
(e)
Type of bearings and NSN (if applicable), if ball bearings, manufacturer's name and identification.
(f)
Detail showing means provided for installing incoming cable.
(g)
Manufacturer's name, identification and rating, and NSN (if applicable) of the switch.
6
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