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8m trac pipe

Discussion in 'Plumbing and Central Heating' started by u587162, 6 Feb 2021.

  1. u587162

    u587162

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    I need about 8m of 22mm trac pipe. Any recommendation on where to buy this online and what to consider?

    Also what is a sleeve for? I plan to bury this under 100mm of celotex, wet UFH on top before we screed the floor. Any issues with that?
     
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  3. MeldrewsMate

    MeldrewsMate

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    If it's to carry gas you'll need to ventilate the cavity around the Trac-pipe. Some have ventilation channels built into the plastic covering, though a sleeve which will allow the pipe to be removed and replaced once the floor is down has obvious advantages.
     
  4. u587162

    u587162

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    Thanks for the reply. Yes it is for gas.

    I'm not sure I follow your point of ventilating the cavity around the pipe. It will be buried in the concrete or screed and next to a 75mm waste pipe. What's the purpose of a cavity if it's being concreted in under the ground?

    Would the same be said if it was a 22mm copper pipe instead of trac pipe? If given the two options, which would you choose - does it make a difference for that length if it is straight more or less for that 8m distance?
     
  5. muggles

    muggles

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  6. u587162

    u587162

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    How would you support this if its going under 100mm Kingspan or in the screed? Thx.
     
    Last edited: 12 Mar 2021
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  8. Bullet-Proof_Biscuit

    Bullet-Proof_Biscuit

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    Gas conduit must be ventilated at both ends, same for meter cupboards, boiler houses (HL & LL vent grilles).

    Tracpipe technically has it's own ventilated conduit by way of the plastic covering over the spiral corrugated inner construction, but I believe it is not yet approved by the gas regulation people therefore the Tracpipe must itself be within a ventilated conduit as advised above.

    The pipe must be sized by the CORGI gas fitter from the line sizing table in his magic book to suit the pressure loss from flow friction along it's length, and 8 meters sounds like a step up to 35 might be in order, totally dependant on the appliances drawing from it. You need the Tracpipe compression male irons to suit btw.

    Cue gas police giving me a telling off now :D
     
  9. muggles

    muggles

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    CORGI gas fitter? It's not been CORGI for 12 years now, it's Gas Safe. If you don't even know that, maybe you're not the right person to be giving advice on gas installations? ;)
     
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  10. muggles

    muggles

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    Clip it to the slab
     
  11. Bullet-Proof_Biscuit

    Bullet-Proof_Biscuit

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    Which part of my technical advice was incorrect? ;)
     
  12. DIYnot Local

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