vacuum in gravity lines

[lafite]

Is there any tell tale signs that you are creating a vacuum in a gravity line without actually measuring it?

[Maple Hobo]

Vapor lock might be a sign?
If a bubble is trapped and the air can't pass a liquid block to burb or vent.

Sort of like sticking a straw into your drink, putting a finger on the end and picking up the straw with the liquid trapped in it.

This can happen with a vacume pump running on the line too if its running the line full and it can't get vacume to the top of the line through the water.

[lafite]

what I meant was that some have indicated you can create a natural vacuum with a gravity system. I was wondering if there were some tell-tale signs that it was occurring.

[BryanEx]

I'll be a smart a$$ and ask... is it flowing into your buckets? Yep, it's working. :D

I know... I know. Not a helpful answer.

[TapME]

I have ben told by a person of great knowledge that if the bubbles are the key. The closer they are together the greater the pull is at the other end. The quicker they are moving is also a sign. Bad days on my line are bubbles moving slowly, better days are when they move fast and are close together. Just my 3 cents (inflation) This is on 5/16 tubing

[adk1]

yeah that is what I have been told too. The more slope you have on the laterals and the more taps create the vacume. I have plenty of slope to deal with, just not alot of taps on each lateral line unfortunatly.

[lafite]

first year with gravity and I am liking the results so far. My back is thanking me as well!

thanks for the response!

[farmall h]

adk1 hit right on! Best explanation of natural gravity I ever heard told. Yup seen it...ran gravity for 20+ years and that is what it looks like.