5/16 dryline vacuum loss

[maplemas]

I have a vacuum Monitor with a 150' of 5/16 tubing between mainline and sensor, is there a chart or formula to determine vacuum loss due to friction?

[Atgreene]

Should be no friction. Nothing is moving in ithe if it goes to a guage etc..

[BreezyHill]

Steve Childs at Cornell will be the best source I can think of that may know where to find such a chart.

To suck on the gauge there must be movement within the line to evacuate the gas...thus a fricational loose must be accounted for.

[wiam]

After the line is evacuated there is no movement so no friction.

[maple flats]

To make the gauge adjust to the vacuum there will be movement but once the gauge stops moving and displays the static vacuum , no movement, no friction loss.

[Shaun]

Nothing technical here, you can sure tell the difference by sound when pulling taps closer to the main line with the pump on. I will be installing more taps this year, hoping to keep lats as short as possible. It seems 75 feet or less would be best?

[maple flats]

Shaun, you're correct, but a vacuum gauge is not an open line. When you pull taps you will certainly notice a difference in sound on closer taps to farther out taps, that is line friction. But with a vacuum gauge it takes very little time for the vacuum to pull the vacuum and once it has there is no movement in the line, thus no friction loss.