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andyd53
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Join Date: Mar 2008
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High Salinity Ground Water Material Selection for Pumps

08/28/2009 1:50 AM

Hi,

I'm trying to establish the best material selection for submersible pumps and associated pipework in an environemt which can be upto 35 degrees C with salinity levels up to 5 times greater than sea water. reaching peaks of 4000 on occassion. There would also be additional sewerage organic and inorganic presence with associated H2s. I'm looking to protect the pump impellors wear rings, faces of mechanical seals and casing of the pump plus the vaves and pipework and securing bracket and bolts. Stainless steel 304 has been used previously unsuccessfully and 316 has lasted longer but still has issues and failures. Anyone any practical knowledge or experience of protection for this type of application or theoretical best material selection metal or composite materials?

Thanks in advance to any and all contibutors to this posting.
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Pathfinder Tags: Composite Material material protection salinity submersible pump
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PWSlack
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#1

Re: High Salinity ground water material selection for pumps

08/28/2009 3:06 AM

Plastics.

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andyd53
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#2
In reply to #1

Re: High Salinity ground water material selection for pumps

08/28/2009 3:52 AM

Thanks hope the kettles now boiling and you hav a cuppa in hand. Unfortumately one work Plastics really does not assit unless you can further specify type of plastic or composite material. Thanks again for the reply.
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PWSlack
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#3
In reply to #2

Re: High Salinity ground water material selection for pumps

08/28/2009 4:18 AM

Polyethylene/polypropylene/polyvinyl chloride/acetyl butadiene styrene....

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Ed Weldon
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#4

Re: High Salinity Ground Water Material Selection for Pumps

08/28/2009 10:59 PM

Looks like PVC is a good and economical choice if you are dealing with moderate pressures and small to moderate capcities. Lots of hardware is readily available. If your system design has you trapped into using large metal components you're probably looking at Hastelloy C (get ready for serious sticker shock) at least in selected locations where corrosion creates high maintenance costs and frequent shutdowns.

Lots of major chemical pump manufacturers have Alloy 20 readily available and a lot less expensive than Hastelloy C. Alloy 20 ( commonly know as Carpenter 20 from the marketing name given to it by one of the alloy's early developers) may turn out to be an economical choice for pumps and valves even with the corrosion rate. The following links give some good info:

http://www.parrinst.com/doc_library%5Cdealer%5CCarp20.pdf

http://en.wikipedia.org/wiki/Alloy_20

http://www.pep-plastic.com/pdf/ChemGuide.pdf

Ed Weldon
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andyd53
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#6
In reply to #4

Re: High Salinity Ground Water Material Selection for Pumps

08/29/2009 6:22 AM

Thanks.

I've previously looked at and used Zirconium for impellors in high erossive situations and this although the capital cost of mould etc it reduced the Operational costs and lasted over 10 times longer than the original impellors. however there were no real corrosive issues associated with application.
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bioramani
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#5

Re: High Salinity Ground Water Material Selection for Pumps

08/29/2009 2:42 AM

Titanium will work.

http://www.pumpbiz.com/shopping_product_list.asp?pcid=5766

Bioramani

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MOBI
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#7

Re: High Salinity Ground Water Material Selection for Pumps

08/29/2009 6:33 AM

High strength super alloys (Cu/Ni alloys) could be OK. Have excellent resistance to marine corrosion and hydrogen embrittlement........Marinel may be suitable for your requirements.......... also has excellent machinability properties.

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Ed Weldon
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#8

Re: High Salinity Ground Water Material Selection for Pumps

08/29/2009 11:06 AM

I did a bit more digging on sodium chloride and finall hooked up with a Google Books result on

Handbook of corrosion data

By Bruce D. Craig, David S. Anderson, ASM International"

Pages 726 through 758 cover sodium chloride. Some pages are missing but I think you will find enough data there to be helpful. The book is available and the price, while fairly high at around US $270 may still be a worthwhile investment for a commercial size installation like yours, especially considering the variability of the liquid streams you are encountering.

Ed Weldon
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Spinco
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#9

Re: High Salinity Ground Water Material Selection for Pumps

08/31/2009 10:58 AM

A less expensive option to Titanium or Copper-Nickels but not as cheap as plastics would be in the aluminum-bronze family, CDA 95200 through CDA 95500, esp. 955.

That material was used in the consruction of de-salinization plants (pumps and heat exchangers) in Saudi Arabia back in the 70's

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strider6
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#10

Re: High Salinity Ground Water Material Selection for Pumps

09/03/2009 2:31 AM

In my opinion, you have to go for a high nickel alloy materials with a chloride conc and temp so high. it would be possible to evaluate also some copper alloys but you've also h2s and there are a limitation on the max velocity.

have a look at this documents from nidi:

Materials for Saline Water Desalination and Oilfield Brine Pumps

hope this help u

S
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Ed Weldon
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#11
In reply to #10

Re: High Salinity Ground Water Material Selection for Pumps

09/03/2009 11:59 AM

strider6 -- GA. You have provided an excellent set of references for answers to this complex subject. Thanks from my direction also.

Ed Weldon
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andyd53 (2); bioramani (1); Ed Weldon (3); MOBI (1); PWSlack (2); Spinco (1); strider6 (1)

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