zOLD – Compressors – Frequently Asked Questions

FAQ / Glossary / Air Compressor Ratings Article

What does this terminology mean? see our glossary

Are horsepower ratings of air compressors accurate? Read this article….>

What size pipe do I need? see below

Recommended Pipe Sizes
Length of Pipe In Feet
Air CFM 25 50 75 100 150 200 250 300
5 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2
10 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
25 3/4 3/4 3/4 3/4 3/4 1 1 1
50 1 1 1 1 1 1 1 1
75 1 1 1 1 1-1/4 1-1/4 1-1/4 1-1/4
100 1-1/4 1-1/4 1-1/4 1-1/4 1-1/2 1-1/2 1-1/2 1-1/2
150 1-1/2 1-1/2 1-1/2 1-1/2 1-1/2 2 2 2
200 2 2 2 2 2 2 2-1/2 2-1/2
250 2 2 2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2
300 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2 3 3 3
400 3 3 3 3 3 3 3-1/2 3-1/2
500 3 3 3 3 3-1/2 3-1/2 3-1/2 3-1/2
600 3-1/2 3-1/2 3-1/2 3-1/2 3-1/2 4 4 4
700 3-1/2 3-1/2 3-1/2 3-1/2 4 4 4 4
800 3-1/2 3-1/2 3-1/2 4 4 4 4 4
900 4 4 4 4 4 5 5 5
1000 4 4 4 4 4 5 5 5

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