RE: Langalier Index vs Pipe Material/ Design Life Expectation

From: <Steve>
Date: Thu May 27 2004 - 18:58:00 EDT

Thanks Thomas

thats just what I need to know.

Cheers

Steve

-----Original Message-----
From: Thomas Laupa [mailto:tlaupa@frii.com] Sent: Friday, May 28, 2004 8:02 AM
To: <a href="/group/PipingDesign/post?postID=xBUMnYIwG2WWLcCiGZPzZfMqSyA2jyq6bxSX7F4Dav54rAGZf0BFSqepGj5w2ChQguTHxanNR9EjN9atfW9IHVhjSw">PipingDesign@yahoogroups.com</a> Subject: RE: [PipingDesign] Langalier Index vs Pipe Material/ Design Life Expectation

Steve:

we generally do not consider LSI (Langlier Saturation Index) a good measure of corrosivity. we use proprietary modeling software to estimate corrosivity based on a complete water analysis. the model works for general waters, but does not accurately predict the behavior or process solutions, etc. for this we use Perry's Chemical Handbook.

for design purposes, we try to maintain corrosion at less than 5 mills per year (mpy) in steels, less in alloys.

commercial software similar to our proprietary model is available from a company called French Creek (in California somewhere, i think). i've seen results from this model which closely agree with ours.

At 08:39 AM 5/28/2004 +1200, you wrote:
>Hi Thomas
>yes I am sort of. Its for a pipeline that will be built soon. I want to be
>sure that the selected pipe material/surface treatment is suitable fror a
20
>year life.
>The coated steel options will be the tricky ones to estimate life, but may
>be the cheapest.
>
>Cheers
>
>Steve
>
>-----Original Message-----
>From: Thomas Laupa [mailto:tlaupa@frii.com]
>Sent: Friday, May 28, 2004 6:57 AM
>To: <a href="/group/PipingDesign/post?postID=xBUMnYIwG2WWLcCiGZPzZfMqSyA2jyq6bxSX7F4Dav54rAGZf0BFSqepGj5w2ChQguTHxanNR9EjN9atfW9IHVhjSw">PipingDesign@yahoogroups.com</a>
>Subject: [PipingDesign] Langalier Index vs Pipe Material/ Design Life
>Expectation
>
>
>Steve:
>
>are you concerned with corrosion rates as a function of Langlier Saturation
>Index?
>
>At 10:55 AM 5/27/2004 +0000, you wrote:
> >Gents
> >
> >anyone have an authoritative web/book reference to the above?
> >Similarly for D.O.
> >I need something quotable.
> >
> >I curse the day I gave away my AWWA standards.
> >
> >Liquid is lake water. L.I. is possibly around -3. Flow is around 4000
> >m^3/h.
> >
> >thanks in anticipation.
> >
> >Cheers
> >
> >Steve
> >
> >
> >
> >
> >
> >
> >=========================================
> >PipingOffice - Excel Spreadsheets for Piping Calculations
> ><a href="http://www.pipingoffice.us/">http://www.pipingoffice.us/</a>
> >=========================================
> >Main site: <a href="http://www.pipingdesign.com">http://www.pipingdesign.com</a>
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
>
>Thomas G Laupa PE
>Senior Engineer - Nalco Company
>Office Address: 1601 Diehl Road, Naperville, IL, 60563
>Courier Address: 1003 Remington, Fort Collins, CO, 80524
>970-227-5127
>800-493-5009 fax
>
>
>
>
>=========================================
>PipingOffice - Excel Spreadsheets for Piping Calculations
><a href="http://www.pipingoffice.us/">http://www.pipingoffice.us/</a>
>=========================================
>Main site: <a href="http://www.pipingdesign.com">http://www.pipingdesign.com</a>
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>=========================================
>PipingOffice - Excel Spreadsheets for Piping Calculations
><a href="http://www.pipingoffice.us/">http://www.pipingoffice.us/</a>
>=========================================
>Main site: <a href="http://www.pipingdesign.com">http://www.pipingdesign.com</a>
>
>Yahoo! Groups Links
>
>
>
>

Thomas G Laupa PE
Senior Engineer - Nalco Company
Office Address: 1601 Diehl Road, Naperville, IL, 60563 Courier Address: 1003 Remington, Fort Collins, CO, 80524 970-227-5127
800-493-5009 fax

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Yahoo! Groups Links Received on Thu May 27 18:58:00 2004