Thread: joining acetylene hoses

Whatever you do dont use any copper near the acetylene .

I forget the name of the nasty it turns into with the mixture of the two, but it will go bang without a match.

I know do I go on a about safety a bit,but think back to to the plumber that kept his cylinders in a closed van somewhere down south a few weeks back.

He doesn't have a van now thanks to the explosive nature of the gas.

People get complacent about the stuff and that how an accident happens.

Having said all that ,how second hand are those replacement hoses?

cheers

Grahame

Thanks graham, the hoses are'nt in bad nick, just the last person cut one end off. I have the proper screwed connectors, i just was'nt shure if I should put something on the thread before i screw it inti the hose?

no you don't put any lube in , when I was at sea I have had to repair a few or remove damaged ends and replace fittings .
They are a .......well very difficult to do , getting the fitting fully into the hose is the difficult part being carefull not to damage the hose ajacent to the end as you need to grip it pretty hard, at sea you don't get a choice but ashore you get the option have you tried an enzed or hose specilist they may be able to put the fitting on for a small cost , or have you actually checked out the cost of new hoses , there not that dear

Joining the hosesand putting the fitting on the ends is dead easy with the tool made up from a pair of RH & LH male threaded oxy /Acetylene hose joiners.

Being the same each end you can saw them in half and braze them back to back to get a tool RH one end and LH the other. They are then drilled and fittted with a 5mm rod brazed .
This makes it easy to lock up the loose female end and the unit is used to screw the tail into the hose.

Grahame

Originally Posted by Grahame Collins

Joining the hosesand putting the fitting on the ends is dead easy with the tool made up from a pair of RH & LH male threaded oxy /Acetylene hose joiners.

Being the same each end you can saw them in half and braze them back to back to get a tool RH one end and LH the other. They are then drilled and fittted with a 5mm rod brazed .
This makes it easy to lock up the loose female end and the unit is used to screw the tail into the hose.

Grahame

any chance of a photo?

Originally Posted by Mathuranatha

any chance of a photo?

settle for a mudmap ?

Grahame

Originally Posted by fuzzy

Thanks graham, the hoses are'nt in bad nick, just the last person cut one end off. I have the proper screwed connectors, i just was'nt shure if I should put something on the thread before i screw it inti the hose?

You could always try saliva.

Regards.

from recollection...

IF you have flashback arrestors, fit the male end to those and gently tighten

Then cut the hose square and slide the female end over the hose.

Hold the end of the hose in some soft jaws or vise grips with a rag.

Screw the fitting with arrestor into the hose.- you can use a spanner on the arrestor.

If you dont have arrestors, use the guage, or blowpipe depending on what end you are fitting.

If this doesn't make sense, I will post a photo later

Originally Posted by fuzzy

Hi guys, my old oxy/acetylene hoses have finally given up and I rounded up some second hand hose.
I have to fit the ends back onto the new hose and I saw wondering what lubricant if any that I should put on the fittings before screwing them into the hose? I know not to put oil on anything.
Thanks.

I've always applied a little spittle.
I have a spanner made up from a piece of 1" x1/8 flat steel with Rh and LH fittings silver soldered on to the flat bar near the end .(probably one of the first tools I ever made)
(see Grahame's post )
You install the nut with the spindle that goes down into the hose on the spanner ,hold the outer bush (ferrule )in the vice with the hose pushed into it .Apply spit to the spindle and screw the spindle into the ferrule , while pushing the hose into the ferrule.

I find the new blue and red hose that is supplied by BOC , doesn't seem to last as long as the old black and red grooved hose of yesteryear ,it seems I have to replace my hoses every two or three years ,because they perish and crack around the fittings.

I have an air hose on my compressor made of the same stuff ( black ) and it must be at least 15-20 years old and it's not perished.

As far as copper goes , I've seen many hoses joined using copper tube and screw hose clamps ( not in the best interest of safety ).I never knew about the clash with acetylene and copper ( not that I would join a damaged hose like that any way because you used to be able to get proper joiners.

I thought the gas welding tips were made of copper, or are they ok because the oxy and acetylene are mixed before they get to the tip?
Just curious.

Kev.

Thanks guys, I had a go yesterday with a bit of spit on it and it seemed to work pretty good.
Thanks again, Brendan

An old time CiG man told me the nozzles were a copper alloy .

Grahame