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/diy/ - Do It Yourself

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734373 No.734373 [Reply] [Original]

Hello guys i have this stuff and i dont know hot to install it right - gas pipe from heater comes from right side through the nut and the little thingy - what is the right orientation ? i tried both sides and everytime gas was leaking - any tips ?

From the left comes gas hose input and its ok

>> No.734374

Ok image turned - gas pipe comes from left and hose from right :)

>> No.734375
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734375

>>734374
That would need some thread tape I would have thought? I'm not seeing any rubber seals in there.

>> No.734377

Thanks :) I have pipe without screw thread end - will it work ? :D But thanks much

>> No.734383

ptfe tape is for fittings where the thread is the primary seal. A compression fitting like you've pictured relies on the olive making a good seal up around the faces of the joint. If that isn't happening it either isn't tight enough or the olive or fitting is damaged.

No gas fitter I know would touch ptfe because it can prevent a good seal on a compression joint. Plenty would use a smear of jointing compound just for the hell of it. The rest that would not bother because it is just unnecessary.

>> No.734393
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734393

>>734383
yup. when plumbing water, "good enough" is good enough.
when plumbing gas, "good enough" is allahu ackbar

>>734375
compression fittings dont have rubber seals.
and on the threads, only specifically gas tape will do(thicker). and they must be taped.
>>734373
OP did you flair the ends? apparently gas fittings need flared ends to hold properly.
I'm going to go ahead and say always-on pressurized gas lines isn't one of those things I would recommend someone DIY.

>> No.734400

>>734373
the little thing, the 'olive' needs to be crushed in by the taper of the fitting to form a tight seal. the taper of the olive seats in the taper of the fitting, it should be obvious which way round it goes. when crushed correctly the olive won't let go of the pipe.

assuming you're not trying to put the wrong size pipe in, you need to tighten the nut properly. do it up hand-tight then go one and a half turns.

>> No.734406

>>734383
>>734393
PTFE guy here, good to know, cheers.

>> No.734486

>>734375
>>734393
both moronic posts

gas lines are flared or npt, not compression fittings.

>> No.734510

>>734373
post a picture of the hose it comes from and the pipe it connects too. im guessing the right side of the fitting is NPT and the left is for the nut.

>>734486 some might consider corrugated stainless steel tubing to be compression in which case the ferrule needs to be compressed by the nut to make a seal.

either way, dont use teflon tape unless its rate for gas and used in conjunction with thread sealant

>> No.734517

>>734486
do you think OP might be trying to bodge a water fitting onto a gas pipe?

>> No.734519

>>734373
cut your nails, it's disgusting

>> No.734565

https://www.youtube.com/watch?v=FdthSQDH8qk

Like that, very similar system. The tapered end of the sealing ring, or olive, always points away from the nut.

>> No.734570

>>734373
Plumber fg here. Looks like you have a 3/8 speedie tube coupling there for h20. If you are going to use that coupling whatever it is put prodope on the ferrel(the piece in the middle)inside and outside before making it up. Clip nails

>> No.735103

>>734375

On a threaded gas pipe fitting, use the proper type of tape. White PTFE tape is for water. Yellow tape is for gas. Don't use the wrong type of tape or it will break down and leak eventually.

>> No.735127

>>734373
put main pipe so its sticks out from small barell a bit and screw together at about 25 nM

>> No.735132
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735132

>>735127
like this
to check if its gas tight just use window cleaner, spray foam over joints and wait a bit

>> No.735134

>>735132
small barell is main gasket, other end of coupling might use oring

>> No.735136
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735136

>>734393
flairing press

>> No.735141
File: 91 KB, 617x617, 0023203_brake-pipe-flaring-kit[1].jpg [View same] [iqdb] [saucenao] [google]
735141

>>734373
hurrr

>> No.735148
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735148

>> No.735179
File: 11 KB, 300x189, metallurgycompr_00000045064.jpg [View same] [iqdb] [saucenao] [google]
735179

>>734373
Its a compression fitting. You don't need to flare the tube, but you do need to tighten it down more than you would expect (ideally to the manufacturers spec!), as you are relying on the deformation of the ferrule to make the thing seal. I have only ever used this type of fitting for hydraulics, but I guess it's the same principle. See pic.