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Table II. Airborne noise limits ( sound pressure levels in decibels (dB) referenced to 20 micropascals (uPa). |
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|  MIL-D-16196E(SH)
agency.
Compressor bearing and seals shall be designed for a minimum of 20,000
hours of operation.
New compressor design shall undergo 1,000 hours of
performance testing using steam at operating conditions.
Motors and controllers shall be furnished
3.10.1 Motors and controllers.
in accordance with MIL-M-17060 or MIL-M-17413 and MIL-C-2212, respectively.
Alternating current (at) motors shall be in accordance with MIL-M-17060.
Motors shall be totally enclosed
3.10.2 Motor insulation and enclosures.
or totally enclosed fan cooled with sealed insulation in accordance MIL-M-17060.
Unless otherwise specified (see 6.2),
3.10.3 Motor structureborne noise.
structureborne noise levels shall be in accordance with MIL-STD-740-2 for type
111 equipment.
Motor airborne noise shall not exceed the
3.10.4 Motors air borne noise.
levels specified in table 11.
Airborne noise limits ( sound pressure levels in decibels (dB)
TABLE II.
referenced to 20 micropascals (uPa).
Octaveband center frequency (Hz)
Hp
Synchronous
Enclosure
speed r/rein
lK
250 500
31.5
63 125
51
57
54
66
63
60
1 through 5
All
All
51
57
54
60
66
63
7.5 through 25
All
1800 and
less
64
66
65
66
63
60
3600
7.5 through 25
All
63
69
69
66
66
66
1800 and
30 through 150
All
less
73 i 73
67
66
66
66
3600
30 through 150
All
73
73
67
66
66
66
Above 150
All
3.11
Weight.
The unit shall be designed to minimize operating and dry
weights.
The distilling
3.12 Access for installation. maintenance or replacement.
unit shall be designed so that all parts requiring maintenance, cleaning,
The design shall incorporate
adjustment , or observation are readily accessible.
features for readily venting gases formed during chemical cleaning.
3.12.1 Easy access shall be provided to top and bottom, tube sheets and
demister pads. Where overhead clearance is minimal (that is, clearance does not
These sections
allow for overhead rigging) the head covers shall be in sections.
shall be such that two men, without aid of u echanical advantage, can remove the
15
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