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"Metal to metal seals that may be exposed to sea water without cathodic protection should be made in corrosion resistant alloys such as UNS R30035, R30003, Alloy 625 and Alloy C276. Generally, metal to metal sealing materials shall be more corrosion resistant than surrounding surfaces."[NORSOK...

You can find a lot of useful papers on corrosion in oil&gas in these websites: http://www.corrosioncenter.ohiou.edu/publications/...

MaxCarb If you need to select a material for sour service you need to calculate the partial pressure of H2S and you need also to take into account other factors like the temperature, chloride conc and presence of elemental sulphur. You shall also tale into account all the possible corrosion...

Galvanized steel in a seawater service is not a good material selection, unless you plan for frequent maintenance. However the corrosion rate depends also on the exposure time to seawater, temperature. Welding galvanized steel and thinking to touch up the weld inside the pipe seems an impossible...

Try with: http://www.outokumpu.com/ http://www.outokumpu.com/applications/upload/acom_10292653.pdf?docid=681 hope this help V. Corrosion Control

I agree that carbon steel is not an option and you should go at least to the Ni resist, or improve to higher alloy, but you should define better what you mean with "nasty fluid" if you want to make a good material selection...

It's likely that you'll have some corrosion on steel, but is not possible to say how long it will resist. Galvanic corrosion is a function of several different factors and the difference in potential of the two metals is just one. If you want to avoid galvanic corrosion you should avoid...

You should consider: -external surface in contact with atmosphere -internal surface in contact with fluid (crude) SS is a general classification and depensing on fluid composition, operating temeperature and external exposure (marine, rural..) you need to select the correct type of SS. Vic...

i would say no, there will be no galvanic corrosion, however you should also consider the type of exposure. Is it a marine atmosphere or seawater immersed? Regarding the coupling of galvanized and weathering steel i've found an article from NACE, here below is the main conclusion: "Overall...

Here are some data on corrosion of galvanized steel in contact with chemicals: http://www.galvanizeit.org/images/uploads/pdfs/corrosion_organic.pdf You can also contact the Galvanizeit.org and ask for more data: "If you would like assistance in determining the reactivity of zinc when exposed...

what kind of water in the tubeside? seawater, production, freshwater? S Corrosion Control

These tables show the corrosion rates of Zinc and Zinc-Coated Steel in Sea Water: http://www.galvanizeit.org/aga/about-hot-dip-galvanizing/how-long-does-hdg-last/in-water http://www.galvanizeit.org/aga/about-hot-dip-galvanizing/how-long-does-hdg-last/in-water/water-corrosion-data//#seaWater...

Steve, Experience is something that is not possible to teach.. You're right, i didn't think that in some areas of the world the seawater temperature can reach that values... thanks for your help all the best Vitt Corrosion Control

Steve It was not a lucky guess but just a simple suggestion based on the assumption that if the service is a Sea Water Intake Lines then the operating temperature should be quite "low"... and as i said it was just a suggestion not a material selection report.. have a nice and lucky day S...

have a look also at: DESIGN OF DUPLEX STAINLESS STEEL SUBSEA EQUIPMENT EXPOSED TO CATHODIC PROTECTION http://www.dnv.com/binaries/RP_F112_tcm4-184069.pdf S Corrosion Control

SJones In my experience 30°C is the limit for the application of Superduplex (PREN >40) in seawater. S Corrosion Control

if the pipe length is 10 m i'll go for a corrosion resistant alloy like SuperDuplex.. see this paper, maybe it can help: http://www.copperinfo.co.uk/alloys/copper-nickel/downloads/pub-38-materials-for-seawater-pipelines.pdf S Corrosion & Rust Prevention Control

At 1000 ppm Chlorides and 50 °C also SS should corrodes, i think that in your case it could be that the Ni resist is acting like a sacrificial for the SS. 1000 ppm is usually considered as the "safe" limit for SS like SS 316. Stainless Steel is suitable for high chlorides conc if it's in service...

This can help u: http://dow-answer.custhelp.com/app/answers/detail/a_id/2515/related/1/~/caustic-soda-solution-construction-materials-for-storage-and-handling S. Corrosion & Rust Prevention Control

If a gas is "dry" you'll not have corrosion, see below taken from NORSOK M001 Material Selection: "A gas is considered dry when the water dew point at the actual pressure is at least 10 °C lower than the actual operation temperature for the system" "For pipelines with dry gas or non-corrosive...