Thanks Randy
The polyprocessing information is getting pretty close to what I am after.
Cheers
Steve
>From: "Conner, Randy" <RConner@acipco.com>
>Reply-To: PipingDesign@yahoogroups.com
>To: <PipingDesign@yahoogroups.com>
>Subject: RE: [PipingDesign] Re: Polyethylene chemical resistance for medium
>term liquid hydrocarbon duty
>Date: Fri, 23 Jun 2006 16:06:44 -0500
>
>Steve,
>
>Not claiming to be an expert in plastic tanks, but I noticed there are
>some interesting discussions/different viewpoints of some tank
>alternatives for different applications at
>http://www.tms.org/pubs/journals/JOM/9607/Alvarado-9607.html and
>http://www.polyprocessing.com/pdf/technical/Crosslinked%20Polyethylene%2
>0with%20OR-1000%20System.pdf (It appears that various effects of
>solvation as well as practical and/or regulatory issues involving
>permeation, in whatever directions across the walls of the tanks, may be
>considerations in some applications/areas. It also appears what may
>look like the plain polyethylene in some past common pipes may not what
>is in some contemporary tank walls for some hydrocarbon services).
>
>Randy Conner - ACIPCO
>
>-----Original Message-----
>From: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com]
>On Behalf Of Steve McKenzie
>Sent: Friday, June 23, 2006 5:12 AM
>To: PipingDesign@yahoogroups.com
>Subject: [PipingDesign] Re: Polyethylene chemical resistance for medium
>term liquid hydrocarbon duty
>
>Hi Geoff
>Fire is a separate issue and not relevant in this case.
>PE is routinely used for storing gasoline; am told the gas tank in your
>Ford Falcons is probably PE. I have used HDPE pipe for unloading marine
>gas oil from oil tanker ships over the last 10 or so years.
>Not all chemical resistance charts agree about benzene. I am currently
>storing a small amount of product with no apparent damage -
> yet. And then again Im not sure if all PEs are the same with regard to
>chemical resistance. Certainly, I know that the fuel tank on my Solex
>moped looked like PE, but sure as hell wouldnt weld (after I fell off
>and broke it). Suspect its a something like a PE/nylon copolymer.
>Thanks for your comments; appreciate you letting me know if you find
>anything else.
>
>Cheers
>
>Steve
>
>--- In PipingDesign@yahoogroups.com, Geoff Stone DD&D Australia
><blenrayaust@...> wrote:
> >
> > Steve,
> >
> > PE is not suitable for hydrocarbons storage. Sweklling does occur.
>But the big problem is fire. In the event of a fire the tank will melt
>and the contents spill and fuel the fire.
> >
> > Cross linked PE does not apply to PE 80 or PE100.
> >
> > Geoff
> >
> > Design Detail and Development (a division of Blenray Pty Ltd) URL
>www.waterhammer.bigblog.com.au
> > Mail Address PO Box 1351 Castle Hill NSW 1765 Australia Tel Mob
>0402 35 2313 Office 02 8850 2313 AH 02 8850 2324
> > We specialise in pipe network and waterhammer analysis, pipe stress
>analysis, the design of buried pipelines and thermoplastic pipe systems.
>
> >
> >
> >
> >
> >
> > ----- Original Message ----
> > From: Steve McKenzie <gyro-@hotmail.com>
> > To: PipingDesign@yahoogroups.com
> > Sent: Thursday, June 22, 2006 7:19:30 PM
> > Subject: [PipingDesign] Polyethylene chemical resistance for medium
>term liquid hydrocarbon duty
> >
> >
> >
> > L&G
> >
> > A client is carrying out some temporary works requiring storage of oil
>
> > refinery product including gasoline, benzene, jet fuel, diesel,
> > kerosene and probably a couple I have forgotten. He has already
> > purchased some PE tanks, prior to finalising what would be stored
>in
> > them. Before I condemn them, I would like to be absolutely sure
>they
> > are unsuitable for the duty. The reason for this is that they are
> > already purchased, the design life will only be of the order of 3
> > years, and the tanks walls appear fairly thick.
> > So I am looking for some method of derating the design stresses to
> > compensate for the chemical attack plus a method of uprating the
> > design stress to allow for the relatively short design life. I have
> > some information on the latter, but nothing on the former. Any
>leads
> > would be welcome.
> >
> > Second I have been informed that "linear polyethylene" has inferior
> > hydrocarbon resistance than "crosslinked polyethylene" . Can anyone
> > tell me what the linear and crosslinked terms mean in relation to
> > available PE products (eg PE80, PE100, HDPE,MDPE etc), and the
> > nomenclature more commonly used in piping design.
> >
> > I havent done a web search, but was hoping someone might have an
>off-
> > the-cuff answer. If not, I can do the searching myself.
> >
> > Thanks
> >
> > Steve
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
>
>
>
>
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