wet---dry system

[wvsugarshak]

Hi Here is a question . when i see pictures of wet dry line system the dry is always the same size a the wet line is there a reason for this? do they both have to be the same size. could you run 5/16ths as your dry line? or is the a formula for sizing this?

Thanks
WVsugarshak

[BreezyHill]

The design is based on Cubic Feet per Minute of vacuum transferred to the bush to maintain the vacuum at the end of the system.

The smaller the size the more frictional loss a line will have and less vacuum transfer. Also the longer the line the more frictional losses.

Using two lines of the same size also reduces the number of spare parts one needs to stock to maintain the lines. If you had a 3/4" dry line and a 1" wet line. You have doubled the number of splice connectors, Y connectors that will be needed in the event that a tree blows down and damages the line.

I have both 3/4" and 1" mains and not adding anything other than 1" in the future. BY 2020 we will remove all the 3/4" mains for 1".

Good Luck!