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Author Compressed air question
Ian
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Registered: 28th Aug 99
Location: Liverpool
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26th Apr 12 at 22:58   View Garage View User's Profile U2U Member Reply With Quote
What size compressor tank would you need to inflate a double air bed?

Assuming about 8 bar in the tank and just above atmospheric in the air bed.

Bed is 190cm x 120cm x 15cm so 342 litres.
tom_simes
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Organiser: South Wales
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Registered: 12th Jan 05
Location: Undy, Newport Drives: Skoda Octavia vRS estate
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26th Apr 12 at 23:21   View Garage View User's Profile U2U Member Reply With Quote
I don't understand the question.

Are you talking about a standalone tank of compressed air, that will then be used to inflate the bed? Or a compressor that will be running to maintain its 8 bar pressure?
Ian
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Registered: 28th Aug 99
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27th Apr 12 at 00:04   View Garage View User's Profile U2U Member Reply With Quote
Inflated where there is electricty then deflated to inflate the bed on site somewhere.

Not sure how good my maths is but 24 litres at 8 bar is 192 litres incompressed, and the bed is over 300 at atmos, and you'd want it more. Meaning that 24 litre tank is no good.

[Edited on 27-04-2012 by Ian]
emicen
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Registered: 26th Jul 10
Location: Glasgow
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27th Apr 12 at 00:07   View User's Profile U2U Member Reply With Quote
PV = mRT

cba inserting the numbers

ETA: add a bit cause it wont be isentropic or leak free and you need a pressure differential to drive the inflation

[Edited on 27-04-2012 by emicen]
Ian
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27th Apr 12 at 00:07   View Garage View User's Profile U2U Member Reply With Quote
Can you at least give me meanings for P, V, m, R and T
emicen
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Location: Glasgow
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27th Apr 12 at 00:09   View User's Profile U2U Member Reply With Quote
Boyle's gas law. Essentially pressure*volume = pressure*volume

Tank pressure * tank volume = atmos pressure * (tank + airbed volume)

Then add a little
Wrighty
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Registered: 28th Feb 04
Location: Howden
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27th Apr 12 at 00:12   View User's Profile U2U Member Reply With Quote
cant you just get a mini compressor that goes in your cig lighter in the car? got one with my double air beds
emicen
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Registered: 26th Jul 10
Location: Glasgow
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27th Apr 12 at 00:12   View User's Profile U2U Member Reply With Quote
Fuck me, googled it and it actually *is* boyle's law

Thermofluids arent usually any good when i havent been drinking
LeeM
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Registered: 26th Sep 05
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27th Apr 12 at 00:13   View User's Profile U2U Member Reply With Quote
im revising for en engineering exam tomorrow, i fucking hate boyles law
emicen
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27th Apr 12 at 00:15   View User's Profile U2U Member Reply With Quote
Last time I used it was arguing about cylinder pressures with my mate in work and ended with me telling him to fuck off his k series would shit its headgasket regardless of presure
Ian
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Registered: 28th Aug 99
Location: Liverpool
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27th Apr 12 at 00:49   View Garage View User's Profile U2U Member Reply With Quote
Got a little farty pump but I want a backup plan.
Toby
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Registered: 29th Nov 05
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27th Apr 12 at 05:46   View Garage View User's Profile U2U Member Reply With Quote
I would assume buying a better pump would be more beneficial than carry a.pressurized tank around in the car
Dan
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Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
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27th Apr 12 at 06:19   View Garage View User's Profile U2U Member Reply With Quote
Would this be used in the iveco?

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Gary
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Registered: 22nd Nov 06
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27th Apr 12 at 06:54   View Garage View User's Profile U2U Member Reply With Quote
Dive tank?
Gary
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Registered: 22nd Nov 06
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27th Apr 12 at 06:55   View Garage View User's Profile U2U Member Reply With Quote
Or if its in the truck, Tee off its tanks and stick a coupler in the cupboard
Dan
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Registered: 22nd Apr 02
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27th Apr 12 at 07:07   View Garage View User's Profile U2U Member Reply With Quote
That's what I was getting at Gary

Can make up a small pipe with shut off valve and a test nipple fitting on the other end.

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