OM-240 113 Page 49
SECTION 13
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AIR COMPRESSOR SYSTEM PREPARATION
13-1. Air Compressor System Integration
A. General Information
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Minimum Requirements
For use with a mechanics truck crane, the system should at a minimum include the following items:
1
Reservoir of 20 gal (76 L) or more capacity
2
Safety relief valve
3
Properly sized hoses and fittings, restrained and protected
Depending on the desired compressed air quality, air conditioning components such as separators, filters or dryers may be required.
B. Reservoir
Recommended reservoir size is 20 gal (78 L) or larger. The addition of an air reservoir provides air delivery capacity and aids in reducing the amount of
water and contaminates discharged to the rest of the system by condensing out these contaminants. The reservoir should be ASME Code for 200 psi
working pressure. A drain valve should also be installed for draining water and contaminants.
The reservoir must have a safety relief valve installed of appropriate relieving pressure and capacity of the system. Also, relief valve must comply with
vessel and code under which the vessel is constructed and inspected.
C. Hoses And Fittings
Obtain hoses of the proper length and type with appropriate fittings for the installation according to Table 13-1.
Table 13-1. Air Compressor Hose Specification
Hose ID
Minimum
Working
Pressure
Minimum
Burst
Pressure
Operating
Temperature
in. / mm
psi / MPa
psi / MPa
Degree C
0.5 / 12.7
350 / 2.41
1400 / 9.65
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40 to 100
D. Compressor Oil
.
Mobil 1 Synthetic ATF is recommended. Do not mix oil types.
The cooling oil must have high ageing stability, corrosion protection, and dispersive capacity; low emulsification tendency, and minimum foaming. Vis-
cosity class ISO VG 68 is recommended.
