What air compressor should I buy?

[JasonBModerator @jasonb]

As Maurice says use push fit JG do two air ones the basic will be fine. They do a Tee fitting with moisture trap so you can use that for your outlet points (downwards) just clip to the wall or you can use a wall plate elbow just below and screw your euro/PCL fitting into that.

You could also do it with push fit plumbing such as speedfit with the white plastic pipe.

[Iain DownsParticipant @iaindowns78295]

Thanks for this. I've found the john guest site which looks like it has useful information on and I will review this.

In the meantime, I see that they have a range of pipe sizes (6mm up to 22mm). Is there a preference for one above the others? I would guess that even the smaller diameters won't restrict flow much at the pressures and volumes were' talking about (and are a tad cheaper)?

Iain

[OldironParticipant @oldiron]

I would personally go for all pushin fittings & plastic tube. So much easier to use as long as the tube is cut square. John Guest, Parker Legris or Aignip are available every where. If you have no local supplier and want to buy online with out using Ebay try here >> Hose & Hydraulics

UK supplier in East Midlands. Huge selection & 99.9% from stock.

regards

[Maurice TaylorParticipant @mauricetaylor82093]

Hi, use the largest diameter possible for the fixed pipe around your shed. You can use 10mm hose to go from that to your air tools.If you google air pressure loss in pipe work you will find it’s quite a lot ,especially in small diameter pipes.

Hope this helps

Maurice

Edited By Maurice Taylor on 06/01/2021 18:38:33

[Howard LewisParticipant @howardlewis46836]

When the garage was equipped with a new belt driven V twin compressor on a 200 gallon (not litre ) reservoir, the installers just used ordinary 1/2" iron pipe. The main ran down one side and across the end of a building some 200 feet long 50 feet wide.

15 mm copper pipe should be quite adequate. Air is very low viscosity, you are unlikely to suffer much restriction to flow, unless you are consuming it at enormous rate. Look how quickly air exits an inner tube inflated to less than 20 psi through a hole less than 1 mm diameter.

The average 3 hp direct drive compressor cannot keep up, for long, with a tyre inflator or a small blow gun, so a pipe with a bore of 12 – 13 mm will be way beyond its capacity, and so cause negligible pressure drop.

A 2 hp direct drive compressor can barely cope with 1.5 mm hole when delivering at 5 psi; it runs on a 50% duty cycle.

Howard

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