Richard,
We are really down to micro observations on this one.
It seems to be a compressor by popular vote. It must be a multi cylinder operation to justify such a huge cooling radiator. The heat generated from a single compression (unlikely to be any more than 150psi) couldn't justify it. Also, if it was a low pressure unit, something that size would fill those 4 tanks in 30 seconds. Unless it was a sandblasting unit not very likely.
I think you are on the right track about it being a high pressure unit for ??. If it was a 3 or 4 compound cylinder compressor it could push it up to 3,000psi ie lots of heat requiring cooling. The 4 small tanks would seem indicate something pretty powerful in small volumes not just air for tyres.
Lang
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