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compression fittings

jaybee
jaybee Member Posts: 128
in THE MAIN WALL
Can anyone tell me when it is good to use compression fittings and when not to and why? sorry guys it seems i am always asking for help but cant help anyone maybe one day Im a newbi.

Comments

  • Terry St.James_2
    Terry St.James_2 Member Posts: 102


    Compression fittings can be used just about any where.
    It has been used in steam tracing and dresser couplings have been used for many years now. There are even comprssion ball valves that really come in handy when the main valves can't close all the way. I would not use conpression joints on high psi piping. But that's a personnel thing. Even Kitec is a great tubing to have around.
  • John@Reliable_9
    John@Reliable_9 Member Posts: 122
    Never, on a oil line system.

    Can loosen over time and let air "leak" in due to vacuum.
    Ball valve type can be a huge help when you can't stop the water to solder.
  • Weezbo
    Weezbo Member Posts: 6,232
    fuel oil lines.

    no way on the oil lines. vibration transition oil leak......expansion fittings "slip"fittings, Dresser couples and pex connections with inserts...all these applications I find work well and have like zero problem ...i havent seen some 3/4 and 1" ferreuls in a long time.for copper...it is almost like they have vanished. anyway
  • RELY
    RELY Member Posts: 33
    No fuel connections at all only water

    > Can anyone tell me when it is good to use

    > compression fittings and when not to and why?

    > sorry guys it seems i am always asking for help

    > but cant help anyone maybe one day Im a newbi.



  • RELY
    RELY Member Posts: 33
    No fuel connections at all only water

    Use flare for fuel and refrigerant it handles higher psi and is very stable joint.Compression use in low to moderate pressure up to 125 psi but in low movement area for water connection
  • Ken_8
    Ken_8 Member Posts: 1,640
    Disagree.

    Compression fittings should only be used when flared fittings, solder or screwed are physically impossible - or totally impractical.

    I know. I know. Every toilet feed/riser and under sink angle stop is "something X compression." In these 1/4" applications, little else can match the speed and cheap price of this particular "connection/joint" but anywhere a larger than 1/4" tube is connected, use any other method but that one. It is a violation of code in many states to use compression fittings on any fuel oil line, gas lines and service water feeds.

    Is a Dresser coupling a compression fitting? Sure. It is however generally steel and generally NOT used in the basic connections - but rather as a repair item - or as an unusual, specialized form of union.

    Anytime a vibration or large thermal swing is present, compression joints typically leak and compromise whatever application or system they are used in.

    Generally, they are the only "fix" a DIY'er (without a torch or flaring tool) can handle. I suspect 90% of all compression joints are used by DIY'ers. Not because they are good; but because they solve the "mystery" of joining tubes and pipes without anything other than a pair of Channel Locks.

    Virtually all plastic tube makers use a modified and "engineered" compression joint system, but these are a completely different form of joint - with little relavence to typical tube and pipe joints.

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