Thread: Low pressure gauges?

Without the details no one knows what your on about.

Perhaps you are talking about the old Harris torch which used to consume all to but the last 4lb of pressure.

Good torches and they consumed dammed nearly all of the acetylene in the cylinder unlike the comet which only took about 50% .Not sure what ever happened to them. possible then Cig took some action as the cylinders may not have be safe with so low a content of acetylene in them.

Perhaps some issue of them sucking up the acetone in the cylinder which is why you don't run a a acetylene cylinder on its side.

Its possible to mount the pair ,but a liscenced gas fitter needs to do it or you might go Kaboom!!

Grahame

Thanks Grahame. To be clear, I meant the delivery pressure gauge, not the tank pressure level gauge.
The handpiece is a Henrob/Dillon. In the instruction booklet, there is a rough way to set the required 4psi without gauges, but the result doesn't really inspire confidence.

Jordan

The Henrob crowd of course have a "special" set of low pressure regs'.They tried that crap on us when we bought a set from them and tried to gouge another couple of hundred bucks from us for the low pressure regs.

To get 4psi or about 28KPa, set the pressure off the acetylene (you should be able to read that easily off the acetylene gauge) and feel it against the palm of your hand.

Set the oxy to the same "palm" pressure.Its accurate to within 1Psi or so.

Grahame

It's really near the bottom end of the scale, so I wasn't sure if that's accurate. Setting by feel of the gas is a good idea.
I guess I could use a gauge with compressed air, just to see what it feels like.

Thanks,
Jordan

I have been setting oxy plants up for welding like this for many years. The reading is purposely taken off the acetylene scale as it is only scaled to 100Kpa or 15 Psi in the old money and that is really easy to read.

Most oxy welding (using a comet 3 type mixer and torch body) is done in the 5 to 7 Psi range anyway and that is not vastly different from the Henrob -Dillion operation.

In my humble opinion the Henrob -Dillon advertising is blatantly wrong and wrongly implies that the gas is mixed externally on standard oxy welding plant.

It claims” The conventional welding equipment, the Oxy/Acetylene torch relies on swaged tips (this bit is true) which roughly mix the gas after leaving the tip & over the work using centrifugal force. “

The Henrob Dillon blurb tells us that the gas is mixed inside the welding nozzle and implies that this is a departure from the ordinary nozzle action. Not so, as the gases in an ordinary Comet 3 welding nozzle are mixed internally. The unit that the welding nozzle screws into is called,,,, a wait for it –The MIXER –

You might ask yourself why this unit has not been embraced by industry and is not a workshop accessory around the world.
Why has it been necessary to change its name-3rd time now.

I am afraid I have a bias against the Dillon Henrob torches and regard them as product pushed by snake oil salesmen.
Disregarding that,I wish you every success in setting it up.

Grahame

I agree, ever since I took it home and tried to do what the obviously very skilled salesman demonstrated. Things like welding Coke cans yet. He emphasised he was not a trained welder, and just a little practice was needed to get amazing results. Alas, this was not what I found. To be clear, I'm not brilliant with my Comet set, but at least it works as expected. I just expected more from the Dillon, especially at the not too low price.
However, it may be that some of the claims are true, like using less gas than other mixers to do the same job. And, I like the compact shape and it seems well made. I'm convinced that in the right hands, it will perform well, because I saw it. But then again so might a Comet be capable of remarkable performance, in the right hands. I guess I'm really trying to figure out whether it's worth persevering with, or give it a thorough selling.
I contacted the current distributors of the torch - they don't sell low pressure gauges now.

Jordan