[Digestion] Digestion Digest, Vol 19, Issue 2
Klauspeter Hankel
kapehankel at gmx.de
Wed Mar 7 06:39:18 CST 2012
Dear Chandler,
maybe, the "white" fouling, you have observed is some sulphur also? ...
PVC, PE or PP, all these materials can be used for gas pipes, specially when you have planned to bring them into the ground also. There will be no risk of chemical corrosion from inside.
PVC must get protected against light, else it will get brittle soon, can be done by painting. PVC doesnt change its length to much, as it is with PE and PP. PE and PP pipes specially will need suport, if you want to bridge a larger distance, to avoid bending.
Klaus Peter Hankel
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> Datum: Tue, 06 Mar 2012 09:59:48 -0800
> Von: digestion-request at lists.bioenergylists.org
> An: digestion at lists.bioenergylists.org
> Betreff: Digestion Digest, Vol 19, Issue 2
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> Today's Topics:
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> 1. Re: Digestion Digest, Vol 19, Issue 1 (Carmine Bocchino)
> 2. Re: plastic pipework (Anand Karve)
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>
> Message: 1
> Date: Tue, 6 Mar 2012 12:48:42 +1000
> From: "Carmine Bocchino" <bocchtech at bigpond.com>
> To: <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Digestion Digest, Vol 19, Issue 1
> Message-ID: <8E0143F641EA4650A1D89C56D38ADFB0 at Cavallier>
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> Hello
>
> I have used all the plastics you refer to and PVC is adequate.
> PE is better but more expensive. PVC will do the job; ensure dry ends
> before
> gluing and allow the joints at least 24hrs to settle before using.
>
> Carmine
>
> -----Original Message-----
> From: digestion-request at lists.bioenergylists.org
> Sent: Tuesday, March 06, 2012 3:59 AM
> To: digestion at lists.bioenergylists.org
> Subject: Digestion Digest, Vol 19, Issue 1
>
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> 1. plastic pipework (Chandler)
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>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 5 Mar 2012 18:19:02 +0100
> From: Chandler <chandlerhatton at simgas.org>
> To: digestion at lists.bioenergylists.org
> Subject: [Digestion] plastic pipework
> Message-ID:
> <CAP=kLCJDQkdfkZi6NYxgYybjMxB+cubCu=YyUctMKMHUUV10LQ at mail.gmail.com>
> Content-Type: text/plain; charset="windows-1252"
>
> Hi all,
>
>
> I am working to implement biogas in East Africa, and I?m curious about
> whether there is a preferred plastic polymer for use in plastic biogas
> pipework. Most affordable, readily available plastic pipes and fittings
> are
> made from PVC (polyvinylchloride), PE (polyethylene), or PP
> (polypropylene).
>
> - Is one of these materials better than the other two for use in gas
> lines? And is there a material that should be avoided for use in
> biogas
> pipework (i.e. due to chemical corrosion, UV damage, or creep?)
>
> - In particular, I am concerned about the accumulation of white
> (silica?) deposits in biogas pipework. Does the use of plastic piping
> reduce the buildup of this white substance? And very specifically, does
> this white substance accumulate on PP fittings?
>
> Any thoughts on these two questions are very much appreciated.
>
> Thanks,
> Chandler
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> ------------------------------
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> Message: 2
> Date: Tue, 6 Mar 2012 11:35:27 +0800
> From: Anand Karve <adkarve at gmail.com>
> To: For Discussion of Anaerobic Digestion
> <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] plastic pipework
> Message-ID:
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>
> Dear Chandler,
> we use PVC pipes and fittings that are also used by plumbers and which are
> readily available in all hardware shops. I don't think that the white
> deposit that you mention is silica. It could be calcium carbonate. Water
> generally has calcium bicarbonate dissolved it. By combining with one more
> molecule of carbon dioxide, it forms calcium carbonate, which is insoluble
> in water and which therefore precipitates out. The pipes can be
> periodically cleaned of this substance by passing a mild solution of
> hydrochloric acid through the pipes.
> Yours
> A.D.Karve
> On Tue, Mar 6, 2012 at 1:19 AM, Chandler <chandlerhatton at simgas.org>
> wrote:
>
> > Hi all,
> >
> >
> > I am working to implement biogas in East Africa, and I?m curious about
> > whether there is a preferred plastic polymer for use in plastic biogas
> > pipework. Most affordable, readily available plastic pipes and fittings
> > are made from PVC (polyvinylchloride), PE (polyethylene), or PP
> > (polypropylene).
> >
> > - Is one of these materials better than the other two for use in gas
> > lines? And is there a material that should be avoided for use in
> > biogas pipework (i.e. due to chemical corrosion, UV damage, or
> creep?)
> >
> > - In particular, I am concerned about the accumulation of white
> > (silica?) deposits in biogas pipework. Does the use of plastic piping
> > reduce the buildup of this white substance? And very specifically,
> does
> > this white substance accumulate on PP fittings?
> >
> > Any thoughts on these two questions are very much appreciated.
> >
> > Thanks,
> > Chandler
> >
> > _______________________________________________
> > Digestion mailing list
> >
> > to Send a Message to the list, use the email address
> > Digestion at bioenergylists.org
> >
> > to UNSUBSCRIBE or Change your List Settings use the web page
> >
> >
> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
> >
> > for more information about digestion, see
> > Beginner's Guide to Biogas
> > http://www.adelaide.edu.au/biogas/
> > and the Biogas Wiki http://biogas.wikispaces.com/
> >
> >
> >
>
>
> --
> ***
> Dr. A.D. Karve
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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> for more information about digestion, see
> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
> and the Biogas Wiki http://biogas.wikispaces.com/
>
>
>
> End of Digestion Digest, Vol 19, Issue 2
> ****************************************
--
kind regards / mit freundlichen Gruessen,
Klaus Peter Hankel
Consultant for Biogas, Renewable Energy & Natural Resources
phone: +49 176 21528382 (G) / +91 98791 10739 (I)
email: kapehankel at gmx.de
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