Page 4 of 4 FirstFirst 1234
Results 40 to 44 of 44
  1. #40
    Join Date
    Oct 2005
    Location
    Olathe, KS
    Posts
    10
    I myself never use dope on unions, flair or compression fittings but I sure find a lot out there that have goop all over them.

  2. #41
    Join Date
    Nov 2009
    Location
    Vancouver BC
    Posts
    5
    I use dope on my union threads, more on the bigger pipes. when im getting into 2" and larger i will switch from dope to permatex, but use alot less.

  3. #42
    Join Date
    Mar 2009
    Location
    northern canada
    Posts
    40
    I remember back in the late 1960's working in a high pressure ammonia freezer plant. All the pipe threads of the various sized steel pipe were doped with a two part sealant, the first component was a yellow powder known as litharge, this was mixed with glycerine until it became a thick paste which was then applied to the pipe threads. When it dried it became rock hard. When you had to dismantle pipe put together with this dope you had better remember where the 36 or even 48" pipe wrenches were. Any other older guys remember working with this?

  4. #43
    Join Date
    Jan 2007
    Location
    Charm City--the city that bleeds
    Posts
    2,778
    dope on the threads is acceptable if not adviseable. dope on the faces never, unless maybe it's 4:59 AND ONLY if all else has failed and is failing. Even then, I would not use it, but I've seen it done.
    A bit of oil on the faces of flares and unions never hurt.

    Some utility companies recommend a non-teflon dope. I'm not a utility, but because of that non-teflon rumor, I got attached to the NT variety of a brand name pipe dope.
    But it doesn't come out of your clothing...EVER!
    It's great to be alive and pumping oxygen!

  5. #44
    Join Date
    Jan 2007
    Location
    Stongsville Oh
    Posts
    872
    I also dope the threads of a union. Not for the sealant, but to lubricate the threads. I to at one time laughed at the plumber that doped threads untill I realized that those are the ones that I didn't need a hammer to loosen.
    ckartson
    I didn't write the book I just read it!

Page 4 of 4 FirstFirst 1234

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