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I want to use HCNG? Can I use PVC pipes to supply HCNG from cylinder to engine at a presssure of 5 bar ? Answered

I have a cylinder in which HCNG or hythane ((it is a mixture of hydrogen and CNG)) is stored at 150 bar pressure and I want to use it in an engine? I want to take the hythane out from the cylinder at a pressure of 5 bar? For reducing pressure I am using Pressure regulator? Can I use PVC pipes to supply HCNG from cylinder to engine at a presssure of 5 bar?

Tags:HCNG

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Jack A Lopez

3 years ago

PVC, either the rigid kind, or the flexible kind like used for garden hose, is probably a poor choice for use inside an engine compartment, even though both of those can probably take 5 bar of pressure.

The reason why is because engines get hot, and PVC loses its strength at temperatures as low as 100C. In fact, you can use boiling water to make PVC change its shape.

It would be probably be bad to have your pipe of flammable gas break open while driving down the road. So I guess that's pretty much just echoing what everyone else said. Except that I'm not worried if what you're doing is illegal or not.

I think the usual material for fuel lines is steel tubing, around 5 mm inside diameter. Copper might work too. It's easier to bend around corners. I am guessing both of those are OK at 5 bar (~75 lb/in^2), although you should probably try to look up those numbers, both rated pressure, and temperature, for whatever tubing you plan to try.

I dunno. In a sense, you are essentially playing with fire here, so please be careful.

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Downunder35m

3 years ago

Apart from being completely illegal in so many terms I highly suggest you pay a visit to your local gas supplier for technical gasses - they will tell you what is required to handle 150bar of pressure.
I am too lazy, so either do the above or ask my good old friend for assistance.

Oh, before I forget: My friend is know by the name Google ;)

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@ Downunder35m, I want to use PVC pipes for making connection between cylinder and engine where pressure of gas is around 5 bar....

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I would have thought it obvious that putting highly inflammable gas, at pressure, in a plastic tube was pretty stupid, without having to say it outright. It is certainly illegal in all the places in the world I have ever worked (23, at the last count), and using it would be enough to have you jailed in those places, in the event of a fire or explosion.