[Digestion] compressing biogas

[Duncan Martin]

Ken and all

Your first bite at the cherry was very tasty - thanks for that!

This bite might be a bit sour though. The economics might depend a lot on 
evasion of govt taxes on vehicle fuel - a loophole they might plug the day 
after you buy your compressor!

And your OSH "escape clause" wouldn't work everywhere, because garages are 
often integral parts of the house, especially in the city and inner suburbs. 
A detached garage might be safer - provided it is well ventilated. (It's not 
much helpl to save folk from being blown up in their beds, only to blast 
them into oblivion when they set off for work!)

Finally, a PS to my response to Michael:  I listed all the plant items you'd 
need, as adding up to a major capital cost (unless you can raid scrapyards) 
but I forget to spell out that most of them would have to be over-rated if 
only operated intermittently, when the wind blows. More cost! And most of 
the time, they would idle or underutilized.
It's hard enough to make these systems pay when fully utilized!

Duncan



----- Original Message ----- 
From: "Ken Calvert" <renertech at xtra.co.nz>
To: <Digestion at listserv.repp.org>
Sent: Monday, September 03, 2007 12:34 AM
Subject: Re: [Digestion] compressing biogas


> Michael etal,   coming back for a second bite at the cherry.  There used 
> to
> be on the market ,out of Europe,  a micro cng compressor by which an urban
> person, could take natural gas from their household supply, and pump it up
> to the required pressure straight into the tank of their car overnight. 
> It
> was quite small and operated at about 1/3 to 1/2 hp.  It would sit in the
> corner of ones garage and got around all the OSH regulations by not 
> storing
> permantly anything dangerous under pressure in ones house.
>    I once talked to someone else who had hooked a  hand operated grease 
> gun
> to a 1/4 hp motor. A lever grease gun will take you up to 7000psi.
> However, he had his pressures and compression ratios all wrong  and it was
> even more painfully slow than one might imagine.   Happy compressing.
> ----- Original Message ----- 
> From: "Michael Smith" <michael_1234 at msn.com>
> To: "digestion" <digestion at listserv.repp.org>
> Sent: Monday, September 03, 2007 8:31 AM
>
>
>
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> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
> http://info.bioenergylists.org
>
>
>
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