Heavy Duty Foot Pumps/ Joining compressors
Submitted: Wednesday, Sep 15, 2004 at 22:50
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Jonoc
Does anyone use heavy duty foot type air pumps as their primary or as an auxilary air compressor.
I have given up with regards to air 12v aircompressors as I can't afford a decent one due to me splashing out on some new
suspension for the rollux.
Plus I havn't heard of anyone whome uses them so just checking, got a beaut one for my bike which pumps a normal car tyre (falcon) up in like less than 5mins, without being able to double as a
camp stove, also checking if there is anything wrong with it (apart from the effort).
Second question , has anyone thought of buying multiple cheap 30-40 lpm compressors ie from ebay, and joining them to a double connector, faster , better pressure, quicker that is atleast in theory i mean imagine buying like ten of those $10 jobs and linking them in series to one tyre. Please someone tell me this is a stupid idea.
cheers Jono
Reply By: Jim Boot - Wednesday, Sep 15, 2004 at 23:04
Wednesday, Sep 15, 2004 at 23:04
Jono
It not a stupid idea however it does not matter how many compressors you have it still will not give you any more pressure just a lot of noise
Jim
AnswerID:
76555
Reply By: navaraman - Wednesday, Sep 15, 2004 at 23:11
Wednesday, Sep 15, 2004 at 23:11
A mate of
mine regularly launches his boat from
the beach from the back of his Hiace and then reinflates the tyres with a
hand pump. I reckon he's daft but it works for him.
AnswerID:
76556
Reply By: V8troopie - Wednesday, Sep 15, 2004 at 23:12
Wednesday, Sep 15, 2004 at 23:12
I see nothing wrong with a decent foot pump, it might even be good for you, exercise wise :-0, but it also might be difficult to find a "good" pump. Most are built to a price and fairly shoddily at that.
I did take a single barrel foot pump as a backup out on a desert trip but never nedded it there. I did test it beforehand if it was up to pumping a 4WD tyre - it did and it took forever and the pump got quite hot.
I think you meant connecting pumps in parallel, not in 'series' with your other suggestion. Connected in parallel increases the air supply volume, in series the pressure, though I think the third pump in the chain might explode with that extra pressure.
By the time you forked out good money for 10 dubious pumps that might or might not last the distance of pumping a 4WD tyre without melting, common sense would tell its false enconomy.
There are reasonable electric air pumps available for around $100.-, I have one and it did get used on a few flat tyres. Yes, it took a lot longer than the $300 pumps but it made the distance.
The beauty of the expensive pumps is their capacity when it comes to re-inflate tyres that were let down for sand driving. With a small pump you might have to have an extended lunch break before the job is done while the big pumps take but a few minutes.
Klaus
AnswerID:
76557
Reply By: Jim Boot - Wednesday, Sep 15, 2004 at 23:46
Wednesday, Sep 15, 2004 at 23:46
I can't see how you can increase the pressure if all the pumps output pressure is for example 40psi there is now way you can get anymore than 40psi.
I have a twin
tank diving system the pressure in both tanks when full is 3000psi when I join the two tanks together the pressure still remains at 3000psi however the cubic capacity has increased
Jim
AnswerID:
76561
Follow Up By: Jonoc - Thursday, Sep 16, 2004 at 00:00
Thursday, Sep 16, 2004 at 00:00
If they were gutsy enough, which they aren't. The piston will compress the volume , to a different volume hence increasing the pressure, normally the original volume is 1 atm 101.7 kpa (i think) and the compressor compresses it down.
But if you supplied the surrounding air to a compressor at the same volume but at a higher pressure , then that compressor will further compress that air to an even higher pressure. send me your email and i will send a picture that will make alot more sense.
or just look up PV=NRT on the net or in a chemistry
with your diving
tank example you have kept the same average number of gas particles per cm cubed or however you like to think about it, so nothing has changed ,
but if you had one
tank at 1000psi at the same volume and another at 3000psi at the same volume , and joined the
tank togethor the pressure would decrease in the 3000 and increase in the 1000 untill the same number of gas particles can be found in both tanks per cm cubed.
FollowupID:
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Follow Up By: Jonoc - Thursday, Sep 16, 2004 at 00:03
Thursday, Sep 16, 2004 at 00:03
It is late, so you might have to let my volume/pressure mistakes slip
sorry for the "volume is 1atm"
FollowupID:
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Reply By: navaraman - Thursday, Sep 16, 2004 at 07:20
Thursday, Sep 16, 2004 at 07:20
Personally I can't see how you could increase he pressure by putting the pumps together either in series or parallel. If you could it would be a dangerous thing to do anyway, why subject a cheap inferior quality pump to more pressure than it is designed for. KABBOOOOOMM
AnswerID:
76570
Reply By: Member - Sand Man (SA) - Thursday, Sep 16, 2004 at 07:42
Thursday, Sep 16, 2004 at 07:42
Jonoc
A hand/foot pump may
well be OK for the occasional partial inflation of tyres (although with considerable effort in 35+ degree heat), but I doubt if they would provide the volume of air required to "pop the bead" after removing and replacing a tyre.
AnswerID:
76576
Reply By: Rosco - Bris. - Thursday, Sep 16, 2004 at 07:52
Thursday, Sep 16, 2004 at 07:52
Jono
Not since I found I no longer have a heavy duty foot.
Cheers
AnswerID:
76578
Reply By: Truckster (Vic) - Thursday, Sep 16, 2004 at 10:09
Thursday, Sep 16, 2004 at 10:09
Yes, $10 pump, 4 tires to inflate from 20-38psi, 35+ degree heat, pumping 2psi in per tire per minute - I can see a dehydrated corpse on the ground real fast. Theres a bit more weight working against you in a 3ton 4wd over a 1.3ton Falcadore..
Save up and buy a good 12 Volt Compressor. You will never regret it.
I have one of the "CHEAP" ebay ones. Works fine. got it for under $200 delivered.
AnswerID:
76599