It depends and it depends mostly on the available pressure of the air compressor. Smaller diameter hoses /tubes cause more friction of high cfm air passing through the tubing, especially when the tubing length increases. If the pump is a rotary vane with lower psi rating, then I would suggest going to a larger diameter tubing so there is less or minimal back pressure on the compressor. However if the pump has a high psi rating (35+ psi) then the pump can easily handle the increased back pressure caused by small diameter hose. The pump needs to produce about 8 to 9 psi at 16ft deep; more psi if the airline length is long. 9-10 psi is at the upper recommended operational psi range for a rotary vane pump. But a pump with ample psi 30-50psi is not under much increased stress when the 3/8 dia hose of 110ft is used.
Last edited by Bill Cody; 07/10/13 08:59 AM.
