Jacques:
We specialize in natural gas systems here at Augusta. I don't want to be
commercial here on this board, so if you would mail me directly at
<a href="/group/PipingDesign/post?postID=UfbNCO3g1izoO7VEYSTN0Oc9LylA0B0w56MmaBcc-qdrLPba_RRU2N-pdHUPFtZ5BbKiBQYaIGDYXkEXfng">gmckinney@augustaeng.com</a>, we could see if we have any common areas.
George McKinney
Does anyone know of an individual or company that are considered to be process specialists in natural gas distribution? My preferred location is Eastern Canada and even better Quebec.
Thanks for any help.
Jacques
Steve:
we do a lot of pH correction in waste water plants and cooling
towers. here are a few things you might consider:
1> Commercial grade sulfuric acid generally contains sludge and
particulate picked up in the acid plant and transportation system. Design
your system to either remove or successfully pass these impurities. This
causes most problems with positive displacement pumps.
2> Steel is commonly used for handling concentrated sulfuric acid (greater
than 90%). The metal is generally considered to be resistant by virtue of
the iron sulfate film, formed on the surface of the steel as a result of
the iron/sulfuric acid corrosion reaction. (Initial corrosion rates are
high until continuity of the iron sulfate film is established.). Those
areas which are subject to high velocities, such as valve trim and pump
check valves, are fabricated from alloy components.
3> Design the system to keep the pipes full up to the point of
injection. This will maintain the iron sulfate film mentioned above. At
the point of injection, this will not be possible. Also at the point of
injection the acid will likely be diluted by the adjacent waste water. For
this reason, fabricate the injection piping from plastic, Alloy-20, or
Hast-C.
4> The pH of the stream will be depressed at the point of injection. This
depressed pH can corrode the floor of a concrete basin or structure. We
generally install a dilution trough fabricated from marine lumber or
plastic with a separate source of dilution water. With the large volumes
of water involved, heat dissipation is typically not a problem.
hope this helps.
At 10:07 AM 3/29/2004 +0000, you wrote:
>Hi Guys
>
>I am looking at a pH correction system for a wastewater treatment
>plant. Occasional alkaline "event" inflows require an acid dosing /pH
>correction system to be installed to keep the downstream bio-systems
>alive and well.
>At present the inflow is around 70l/s minimum. I will need to dose at
>about 10cc/sec based on 98% H2SO4, although for handling reasons this
>will probably be changed to around 75%.
>I envisage "dribbling" the acid into the inflow through a plastic
>quill with no special arrangement made for mixing or heat dissipation.
>However some detail design will be required to validate this approach.
>Before I commence the detail design of the mixing area, I thought it
>may save some time by asking if any of you guys have done this, what
>works, what doesnt etc.
>
>Thanks
>
>Steve
>
>
>
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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
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[Non-text portions of this message have been removed] Received on Mon Mar 29 08:58:00 2004
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