MIL-C-O052980C(ME)
of air when the tank pressure has risen to 200 psig, +0 psig,
-10 psig and to start compression of air when the tank pressure has
Means shall be provided to prevent the
dropped to 175 ±1O psig.
engine from starting against tank pressure or cylinder head
pressure.
3.26.8.1
The size 15 and 25 cfm compressor shall
Idle device.
have a device to automatically reduce the engine speed to idle speed
when the compressor is unloaded.
3.27
Inte rchang eability. All parts having the same part number
shall be functionally and dimensional interchangeable.
Interchangeable parts are defined as two or more parts possessing
such functional and physical characteristics as to be equivalent in
performance and durability and capable of being exchanged one for
the other without alteration of the parts themselves or of adjoining
parts, except for adjustment, and without selection for fits or
performance.
3.28 Workmanship.
All parts, components and assemblies of the
compressor including castings, forgings, molded parts, stampings,
bearings, seals, machined surfaces, and weld parts shall be clean
and free from sand, dirt, fins, pits, sprues, scales, or any
damaging extraneous material.
The compressor shall be free of any
defect that could impair its operation and serviceability.
Steel and aluminum used in the fabrication
3.28.1 Fabrication.
of the compressors shall provide original quality surface finish and
The forming of the
shall be free from kinks and sharp bends.
material shall be done by methods that shall not cause damage to the
metal .
Shearing and chipping shall be done neatly and accurately.
Corners shall be square and true, and sharp edges and burrs shall be
removed.
Flame-cutting may be employed instead of shearing and
sawing.
Burned surfaces of flame-cut material shall be ground or
machined sufficiently to remove ash and cooling checks.
Precautions
shall be taken to avoid overheating, and heated metals should be
allowed to cool slowly. All bends of a major character shall be
made with metal dies or fixtures to ensure uniformity of size and
shape.
3.28.2 Welding.
The surfaces of parts being welded shall free of
scale, paint, grease, and other foreign matter.
Welds shall
transmit stress without permanent deformation of failure when the
parts connected by the welds are subjected to proof and service
loading.
Welders shall be qualified in
3.28.2.1 Welding qualification.
accordance with ASME code IX or AWS D1.1 or D1.2 for the applicable
item and material.
3.28.3
Bolt holes shall be accurately
Bolted connections.
Bolt holes in
punched or drilled and shall have the burrs removed.
structural members subject to variable loads shall be punched or
Washers or lockwashers shall be provided where necessary.
drilled.
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