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Copper is far more expensive and time consuming to fit though. The nylon pipe is brilliant stuff and can be dissassembled/reassembled/used elsewhere easily. It also does not leak or sweat inside the pipe. 15mm will be fine for the main loop - remember the bottlneck is the 6mm PCL fitting. Not sure about the leak or sweat bit inside the pipe comment 🤔 You want to cool the warm compressed air down to below dew point to get the water vapour in the compressed air to condense out into water droplets. You can then get rid of it ,leaving you with dry air. Copper is a lot more effective at doing this as opposed to nylon.Yes, it is a bit more expensive than nylon,but bought from the right place,these copper fittings are not overly expensive. (about 20p per elbow) 😊 |
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Last Edit: May 6, 2020 3:28:25 GMT by Deleted
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The leak bit was meaning the nylon push fit connectors don't leak.
I think I'm maybe confusing the condensing in the pipe as the 'sweating'. I've never used copper at home but we had cast iron at our first factory and some lines would pump out literally a gallon of water if not vented daily.
Regardless of either a good water trap in front of every take off is a must. An air drier would be nice but they are expensive unless you are lucky enough to find a cheap s/hand one.
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The leak bit was meaning the nylon push fit connectors don't leak. I think I'm maybe confusing the condensing in the pipe as the 'sweating'. I've never used copper at home but we had cast iron at our first factory and some lines would pump out literally a gallon of water if not vented daily. Regardless of either a good water trap in front of every take off is a must. An air drier would be nice but they are expensive unless you are lucky enough to find a cheap s/hand one. You want the water to come out of suspension and condense on the pipe so you can drain it off. Home made air drying system is easy enough to do ,with a bit of lateral thinking,and using the pipes to get the water to condense on . Probably more efficient and cheaper than water traps on every outlet . Time will tell 😊 |
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I used 1/2" heavy wall plastic water pipe to plumb the air in my workshop, done the drops for the take-offs in copper. I've got an air drier so I don't have to worry too much about condensation in the lines. The 100m roll of pipe was €120 if I remember correctly. I've had no issues with leaks 2 years down the road.
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@johnnybravo - home made drying system -do tell!
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I think whatever set up you go for its personal choice like ease of installation/cost and a big factor for water is going to be how long the system is running, if its just a half hour here and there its not a major problem, if its running 8 hours a day that's when you have to plan a bit more for water
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@johnnybravo - home made drying system -do tell! I will document the next one I do in a couple of weeks 😊 |
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,790
Club RR Member Number: 34
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May 10, 2020 11:47:14 GMT
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If you stick to 1/2”, NPT and BSP are interchangeable for ‘low pressure’ applications.
1/4” and 3/8” are one TPI different between the two nationalities of thread, so cause problems in identifying and adapting threads.
In industry the low/high pressure break is about 300psi, so all workshop compressor applications are well below that. It also means you can use domestic plumbing fittings and copper or plastic pipe, which are cheap. Bs2871 copper pipe is rated to around 800psi iirc, so also well topside of the job. I’m not sure on plastic as I don’t use it much.
If you need a bigger supply, the rules for 1/2” also apply to 3/4”.
The other thing is, PCL connectors are toss. They’re restrictive, wear quickly and always seem to leak. Euro fittings are far superior, and come free with most cheap to mid range air tools these days. They have a larger internal bore so flow more air, and just don’t seem to wear and leak like PCL do. If you’re starting from scratch don’t waste your money on PCL.
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eternaloptimist
Posted a lot
Too many projects, not enough time or space...
Posts: 2,578
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May 10, 2020 12:50:28 GMT
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Interesting point about PCL fittings.
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XC70, VW split screen crew cab, Standard Ten
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May 10, 2020 13:19:09 GMT
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Plastic push fittings all the way for me .
Kitted out our whole workplace with it 5 years ago as it was a piece of pee to do and we would rather be working and making money than wasting time . Its looks good , is neat and easy and quick to change as well as cheap .
Honestly do not know why people would faff about with metal pipe nowadays .
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May 10, 2020 17:46:27 GMT
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Dez, interesting point about PCL fittings. All my stuff has got Euro fittings on it, but the stuff at school has got PCL fittings. I've never had problems with my stuff leaking air, but a couple of the bits of school kit do seem to leak quite well. I'll add a box of Euro fittings to my order...
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1968 Cal Look Beetle - 2007cc motor - 14.45@93mph in full street trim
1970-ish Karmann Beetle cabriolet - project soon to be re-started.
1986 Scirocco - big plans, one day!
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