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t h e pressure has dropped to 175 I0 psig. A d e v i c e s h a l l b e p r o v i d e d t o p r o t e c t
the motor from starting against tank pressure.
Class 3, compressor shall be provided
3.20.5 Electrical conductive casters.
with electrical conductive casters.
3.20.6 W i r i n g
The cable for wiring the electrical system shall be in
a c c o r d a n c e w i t h M I L - C - 1 3 4 8 6 , l o w - t e m p e r a t u r e ( - 2 5 0 F), type and size as
applicable.
T h e wires shall be enclosed in a loom and clamped neatly to the
structural members.
W h e n a V-belt drive is used, t h e d r i v e p u l l e y
3 . 2 1 P u l l e y . 5-cfm compressors.
s h a l l be provided with an inner hub which clamps to the shaft by moving axially
a l o n g a t a p e r i n t h e o u t e r h u b . T h e mechanical clamping shall be accomplished by
t h e use of a screw member or members for mounting and removal of the pulley.
3.22 I n t e r c h a n g e a b i l i t y .
All parts having the same part number shall be
Interchangeable parts are defined
functionally and dimensionally interchangeable
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 fit or performance.
3 . 2 3 Workmanship. A l l p a r t s , c o m p o n e n t s and assemblies of the compressor
including castings, forgings, molded parts, stampings, bearings, seals, machined
surfaces , a n d w e l d e d p a r t s s h a l l b e c l e a n a n d f r e e f r o m s a n d , d i r t , f i n s , p i t s ,
s p r u e s , s c a l e s , o r any damaging extraneous material. T h e c o m p r e s s o r s h a l l b e f r e e
of any defect that could impair its operation and serviceability
3 . 2 3 . 1 F a b r i c a t i o n . Steel and aluminum used in the fabrication of the
compressors s h a l l p r o v i d e o r i g i n a l q u a l i t y s u r f a c e f i n i s h a n d s h a l l b e f r e e f r o m
k i n k s and sharp bends. T h e forming of the material shall be done by methods that
will 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
F l a m e - c u t t i n g may be employed instead of shearing and sawing. Burned
b e removed.
surfaces of flame-cut material shall be ground or machined sufficiently to remove
a s h and cooling checks. P r e c a u t i o n s s h a l l b e t a k e n t o a v o i d o v e r h e a t i n g , a n d
heated metals should be allowed to cool slowly, All bends of a major character
shall be made with metal dies or fixtures to insure uniformity of size and shape.
3.23.2 W e l d i n g
The surfaces of parts being welded shall be free of scale,
p a i n t , g r e a s e , and other foreign matter. Welds shall transmit stress without
permanent deformation or failure when the parts connected by the welds are
s u b j e c t e d t o p r o o f a n d s e r v i c e l o a d i n g . W e l d i n g shall be in compliance with ASNE
Boiler and Pressure Vessel Code, Section IX.
3.23.3 Bolted connection. All boltholes still be accurately punched or
drilled and shall have the burrs removed. Washers or lockwashers shall be
provided where necessary. A l l b o l t s , n u t s , and screws shall be correctly torqued
and shall have full thread engagement. Matching thread areas securing bolts or
capscrews shall be of sufficient strength to withstand the tensile strength of the
bolt.
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