SS for this water?

[YAHA]

Hello.
We are currently designing some piping to convey sea water for RO plant.
Please help to find an optimal kind of SS for such analysis of water:

Na 6200 mg/l
Mg 45
Ca 40
HCO3 100
Cl 7300
SO4 1200

(temp=2-20 C)
We're examine such variant:SS316L.
Is there any reason to use SS316ti or duplex?
Sea water near Odessa (Ukraine)

 

[EdStainless]

A hyper duplex would be overkill for this application. With only half the Cl of seawater any of the standard seawater alloys should be fine.
The most economical alternative would be a 25% Cr duplex. With their high strength you can use less metal. And you will get good service life.

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Plymouth Tube

 

[YAHA]

Thanks all!
What about chinese duplex and superduplex stainless steel (quality/price)?
What chinese brand can you advise?
Has cooperation with chinese producers any specifical moments?

 

[rneill]

If you are serious about quality then perhaps you need a supplier review process that goes a little beyond informal recommendations on eng-tips ...

"It is unwise to pay too much. But it is worse to pay too little. When you pay too much, you lose a little money; that is all. When you pay too little, you sometimes lose everything because the product you bought is incapable of doing what it was bought to do."

"The common law of business prohibits paying a little and getting a lot. It can't be done. If you deal with the lowest bidder, it is well to add something for the risk you run. And if you do that, you would have enough to pay for something better."

"There is hardly anything in this world that someone can't make a little worse and sell a little cheaper-and people who consider price alone are this man's lawful prey."

By John Ruskin 1819-1900