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86 posts

Master Geek

# 253154 29-Jul-2019 18:33
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Hey All,


Home DIY Air compressor, looking at a secondary air tank to give greater capacity.


I am just wondering if those water pressure tanks can be used for compressed air, or if they are strictly limited to water only?


Some have bladders, some don't. I have seen one that is 100L and doesn't have a bladder, it states it has a diaphragm though, but that may be able to be removed so its literally just a steel tank.


Can you see any issues?


This is just for regular shop air, 90-110PSI type thing.


The water pressure tank I have seen has a Max Working Pressure of 10 BAR / 150PSI.



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8706 posts

Uber Geek

  # 2285338 29-Jul-2019 19:25
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Why not just get an air tank from TradeMe or Chinese engineering supply outfit like Topmaq?


Not sure what size you need, but this:


40l complete with hose, connectors, drain valve, and pressure gauge for $121.



86 posts

Master Geek

  # 2285344 29-Jul-2019 19:32
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Yeah have not seen one over 40L so far. Ideally wanting 100L or more.



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Uber Geek

  # 2285371 29-Jul-2019 20:30
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Sounds like you need a bigger compressor.

100l of compressed air is a crap ton of energy. If it failed, it could level your garage.

Location: Dunedin


86 posts

Master Geek

  # 2285376 29-Jul-2019 20:33
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I have a very capable compressor, 4HP motor with 15.8CFM (450LPM) tripple cylinder compressor, but the tank is only 50L.


Having a secondary tank will allow air tools to run for longer between cycles, and at a more constant air pressure, rather than dipping and peeking between the on/off of the pressure switch.


Aas long as the tank is rated over the working pressure and you have safety release valves, then I don't see the problem.

2987 posts

Uber Geek

Lifetime subscriber

  # 2285443 30-Jul-2019 06:57
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Look for an old CNG tank.



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Uber Geek


  # 2289759 4-Aug-2019 18:00
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We did something similar with our fiber blowing compressor. 
Got a rather large one from a commercial paint supply store that also had a section for paint spraying etc. Added one of those tanks off trademe. Just takes ages to come up to pressure but lasts much longer between runs and they are hooked up in parallel. 


We dont store it pressurized though. 

Ray Taylor
Taylor Broadband (rural hawkes bay)

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For my general guide to extending your wireless network Click Here

249 posts

Master Geek

  # 2290493 5-Aug-2019 20:07
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I’ve seen guy using a couple of 9kg lpg cylinders to add capacity to his compressed air system. You can usually get them for free when expired. Do your own research though.

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