Best black iron jointing method

Discussion in 'Plumbers' Talk' started by Plumber's Mait, Apr 9, 2005.

  1. Plumber's Mait

    Plumber's Mait New Member

    Hi;
    I have to move a rad fed by 1/2 inch black iron a couple of feet - i can shorten the existing flow & return to do this. I'm proposing to use hemp & paste to remake the dismantled joints - is this the most secure jointing method?

    GH
  2. PTFE, nowadays, with maybe a squeeze of Fernox LSX or similar!
  3. doitall

    doitall New Member

    Hi;
    I have to move a rad fed by 1/2 inch black iron a
    couple of feet - i can shorten the existing flow &
    return to do this. I'm proposing to use hemp & paste
    to remake the dismantled joints - is this the most
    secure jointing method?

    GH

    Best by far is the old way, as an alternative use Locktite 55 string
  4. Plumber's Mait

    Plumber's Mait New Member

    Hi;
    doitall; when you say 'the old way' - i assume you mean hemp & paste?

    GH
  5. hemp & boswhite... yes the old messy way, i've never had a problem with PTFE, and always ues single wrap to make things easier.

    I guess your just going to screw in/on a 1/2" to 15mm adaptor then run to rad in 15mm copper or plastic?
  6. bathstyle

    bathstyle New Member

    Hemp and paste.........used it 13 years ago at college, never been near it since. PTFE works fine for me too
  7. the only thing we used hemp for at college was as a wig, to look like a hippy!

    Can you still buy the stuff? :)
  8. Plumber's Mait

    Plumber's Mait New Member

    Okay, point taken!

    Gas PTFE with single wrap SpykeBmth?

    The iron goes straight to the rad valve so thought i'd leave that to match other existing rads in area & possible future erosion from mixing metals.

    GH

    PS. Yes, you can still buy hemp - but not at all merchants i guess!!!
  9. Yep, single wrap PTFE, as used for gas, I use it on water all the time!

    Can see you you'd like to leave tails to match!

    maybe the older guys would still use hemp, and prefer it, just something i've never used!

    PTFE - Plumbers Tape For Everything!
  10. doitall

    doitall New Member

    Trouble with you guys your frightened to get your hands dirty :)

    Spike, started a job this week, that has 200ft of 2" iron branching 2 ways off a 3" riser, Then 5 1" branches to the powrmatic heaters, what would you recommend I use to make joints with. :) (one wrap)?

    ps its 6m of the floor.
  11. bleve?

    bleve? New Member

    rocol for gas jetblue for heating/water services
  12. Plumber's Mait

    Plumber's Mait New Member

    Many thanks for contributions.

    GH
  13. Trouble with you guys your frightened to get your
    hands dirty :)

    Spike, started a job this week, that has 200ft of 2"
    iron branching 2 ways off a 3" riser, Then 5 1"
    branches to the powrmatic heaters, what would you
    recommend I use to make joints with. :) (one wrap)?

    ps its 6m of the floor.

    Whatever you feel happy with!!! Single wrap PTFE isn't recommended for joints above 2" is it!!

    I'm pleased I stick to domestic sized pipe!

    Hope you've head for heights on!!
  14. chris@vietec.com

    chris@vietec.com New Member

    Whenever I worked on industrial pipework and boiler houses, we always used boss white and hemp for the iron pipework, the only change now would be I would probably use jet blue instead of boss white, Loctite 55 is excellent, but some companies will not pay for it on large jobs because of the cost, although it does save on labour time
  15. tomplum

    tomplum New Member

    ptfe is ok but, if you have to unwind the jount slightly to make the final connection, the joint will leak, whereas with hemp and paste it will be fine.
  16. doitall

    doitall New Member

    Interesting comments.:)

    Not allowed to use normal Ptfe or boss white and hemp on gas, that leaves one wrap, locktite string or gas jointing compound
  17. bathstyle

    bathstyle New Member

    Can you use Hawk white by itself?
  18. doitall

    doitall New Member

    good question, does it say suitable for gas on the tin.

    I wouldn't use it on it's own anyway as there will be too much vibration in the factory.
  19. bathstyle

    bathstyle New Member

    I havent touched gas for a number of years (Bathroom Installer!) but I remember just using hawk white by itself on the rare occasion I had threaded fittings to make up
  20. doitall

    doitall New Member

    Not something I use but will ask the question, I don't think you can anymore.

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