Hi Steve,
I have about twenty plastic text books at my disposal but am yet to find one
that suggests that PE should be used for storage of large quantities of
hydrocarbons. Sure your PET bottle with metho is OK but bulk storage? I will
keep looking.
What Code was used to design the PE pipeline for marine storage? I am interested
to know if it comes up again.
Of course polyamides and PE are used frequently here for natural gas
reticulation but at low pressure.
regards
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: Friday, June 23, 2006 8:11:38 PM
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]
>
[Non-text portions of this message have been removed]
Received on Fri Jun 23 20:25:00 2006