A rough calc for 100' of line and 20 cfm gives a pressure drop of 48 psi for
..5" id, 5.6 psi for .75" id, and 1.2 psi for 1" id - diameter is your FRIEND
:-).

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Regards,
Carl Ijames
"Karl Townsend" wrote in message
...

I'm over to "the Kid's" place tommorrow. We're moving the air
compressor to his basement and setting up scaffold for sandblasting
the whole exterior of the house. He just found 100' of 3/8 line
restricts the blaster too much.

His question, what should be used for temporary large ID air line?

Karl