Page 2 of 2 FirstFirst 12
Results 14 to 18 of 18
  1. #14
    Join Date
    May 2013
    Location
    Winnipeg, Manitoba
    Posts
    22
    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary, or ask questions of the OP here.

    You can find the rules for posting and qualifications here.

    Further infractions may result in loss of posting privileges.
    Last edited by beenthere; 05-03-2013 at 06:56 PM. Reason: Non Pro * Member

  2. #15
    Join Date
    Dec 2008
    Location
    Ontario Canada
    Posts
    547
    Quote Originally Posted by D1DR View Post
    Just some addition to the vac discussion. I have learned that rubber hoses on your gauge manifold can off gas. This means with no leak in the system a rubber hose can make it look like a leak. I tested this once and flared soft copper lines to replace my rubber hoses. Wow what a difference. Not that I do it every time but on critical equipment it can be the difference between searching for a ghost leak or packing up at 4 on Friday and going home.
    Absolutely it can. Always keep your mic gauge hard piped to the system when doing a mic test, no hoses.

    If I get a mic test to rise up above 500 and taper off below 2000, I suspect remaining moisture and generally assume I do not have a leak. If it goes above 2000 and won't stop, I begin leak checking

  3. #16
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    D1DR, this is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary or ask questions of the OP here.

    You can find the rules for posting and qualifications here.

    Your post has been deleted.
    Further infractions may result in loss of posting privileges.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #17
    Join Date
    Mar 2013
    Location
    Joplin,Missouri
    Posts
    310
    Its probably that his gauge hoses aren't holding the deep vacuum. Even the smallest of leaks in hoses due to bad seals will show up on the micron gauge. If he is so worried about it put nitrogen on it again and soap his welds instead of spending too much time watching the micron guage. Test it and move on.

  5. #18
    Join Date
    Dec 2011
    Location
    Hiram, Ohio
    Posts
    218
    Well, he came back and pumped it down again. Got it to 137 microns and then it only bounced up to about 350 in 20 minutes. So, the charge was released, and the system is up and running!

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event