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1-<strong>800</strong>-<strong>ROTUNDA</strong><br />
AIR COMPRESSOR SELECTION GUIDE<br />
7-1<br />
For current pricing<br />
visit www.onerotunda.com<br />
IN SELECTING YOUR COMPRESSOR, THE FOLLOWING IS SUGGESTED:<br />
A) For a typical Service Department, take the number of service bays and multiply x 2.4 c.f.m./bay to arrive at the amount of c.f.m.<br />
required for the department, e.g.:<br />
12 bays x 2.4 = 28.8 c.f.m.<br />
From the air compressor selection charts, under a c.f.m. @ 175 p.s.i., this could be handled by a 10 hp vertical or horizontal<br />
machine (34.8 c.f.m.).<br />
B) The same requirements are involved in the Body Shop except that the air usage is substantially higher (air buffers, sanders, spray<br />
equipment, etc.). The industry uses 5.5 c.f.m./bay. The calculations are the same, e.g.:<br />
5.5 c.f.m. x 12 body bays = 66 c.f.m. total<br />
The selection would be a 20 hp unit (76.7 c.f.m.).<br />
C) In the event both the Body Shop and Service Department are in one building, it will be necessary to add both the air requirements<br />
together, e.g.:<br />
From A (Service Dept.) 28.8 c.f.m.<br />
From B (Body Shop) 69.6 c.f.m.<br />
Total = 98.4 c.f.m.<br />
This would require a 30 hp unit.<br />
TO PROVIDE THE MOST ACCURATE AIR REQUIREMENTS FOR YOUR APPLICATION,<br />
IT IS SUGGESTED THAT YOU USE THE FOLLOWING CALCULATIONS:<br />
A - Service Bays Number of bays x 2.4 = _______ Total<br />
B - Body Shop Number of bays x 5.5 = _______ Total<br />
C - If all in one building Add together _______ Grand Total<br />
To base compressor selections on just service bays, use calculation A. On just Body Shops, use calculation B. If all in one building,<br />
use calculation C. If the calculation falls between two sizes, then chose the higher hp. When the whole operation is depending on<br />
one compressor, it is recommended that a duplex unit or a double packaged compressor be used. In all cases we strongly suggest a<br />
two-compressor package or a duplex, rather than a single unit.<br />
NOTE: Since water in air lines is damaging to air tools and is especially damaging to car painting operations, it is strongly<br />
recommended that both aftercoolers and compressed air dryers be used.<br />
Duplex air compressors are a unique configuration that lets you alternate automatically between two compressors, or, when required,<br />
operate two compressors simultaneously to deliver double the c.f.m. of a single unit. They are specifically designed to accommodate<br />
additional capacity in peak periods. This system also provides 100% back up in case one compressor is down for maintenance or<br />
repairs.<br />
Rotary screw compressors are an alternative to the reciprocating compressor. Designed for a 100% continuous-duty cycle. Continuous<br />
operation means that the compressor may be sized closer to the actual required capacity (c.f.m.) that is needed. Compressor units<br />
come completely packaged with sound enclosure standard for extremely low noise operation. They have a small footprint and can<br />
be installed right in the work environment eliminating the separate compressor room. There are few moving parts in the compressor,<br />
which reduces maintenance costs. The rotary screw compressor is designed to run 100% of the time and is most efficient when running<br />
continuously.<br />
BRAKE<br />
SERVICE<br />
CLIMATE<br />
CONTROL<br />
SERVICE<br />
COLLISION<br />
REFINISHING<br />
COLLISION<br />
REPAIR<br />
FACILITY<br />
FLUID<br />
HANDLING<br />
GENERAL SHOP<br />
EQUIPMENT<br />
LIFTING<br />
EQUIPMENT<br />
PARTS<br />
STORAGE<br />
POWERTRAIN<br />
SERVICE<br />
SHOP<br />
FURNITURE<br />
STARTING &<br />
CHARGING<br />
SYSTEMS<br />
VEHICLE<br />
DETAILING<br />
VEHICLE<br />
DIAGNOSTICS<br />
WHEEL<br />
SERVICE
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