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Corrosion engineering | Forum profile
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Forum profile page for Corrosion engineering on http://www.eng-tips.com.
This report page is the aggregated overview from a single forum: Corrosion engineering, located on the Message Board at http://www.eng-tips.com.
This forum profile page summarizes the general forum statistics such as: Users Activity, Forum Activity, and Top Authors, which are reported in either a table or graph below for a given reporting time period.
Additional forum profile information for "Corrosion engineering" on the Message Board at http://www.eng-tips.com is also shown in the following ways:
1) Latest Active Threads
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Warning: These statistics are generated using 'best efforts' and can experience delays and reporting errors at times. Please note that such statistics do not constitute a forum's popularity and/or exact posting volumes at any given reporting period.
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Posting activity on Corrosion engineering:
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3 Months
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Threads:
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13
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51
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146
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Corrosion engineering Posting activity graph:
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Top authors during last week:
user's latest post:
Zink anodes in Seawater coolers:...
Published (2009-11-24 23:04:00)
Hmmm, good point, why didn't I think of that? So finally, yes, (too much) teflon tape does interfere with the cathodic protection. Gracias.
user's latest post:
Zink anodes in Seawater coolers:...
Published (2009-11-24 20:33:00)
If you do, indeed, need the seal then you have to be careful how much tape you use. If you use a lot and do not tighten the thread enough you can insulate the joint. You could use an ohm meter to check conductivity.
user's latest post:
DeW
Published (2009-11-23 06:42:00)
( try with NACE . www.nace.org , or you can buy the EFC, http://www.efcweb.org/ , european federation of corrosion, publication n13, predicting co2 corrosion in the oil&gas industry, where is contained also the paper of NACE. S , )
user's latest post:
NACE RP0475 - Produced Water...
Published (2009-11-23 20:48:00)
( Agreed. The NORSOK and draft NACE standards are a little weak. NORSOK because it is focused on offshore Norway and ISO because there are too many factions involved in its production. The issue with NAB in sour water is conversion of the passive oxide layer to copper sulphide which then opens up the cathodic reaction to increase the corrosion rate. The question is: in...
user's latest post:
NACE RP0475 - Produced Water...
Published (2009-11-24 00:25:00)
Appreciate the additional info and I hadn't thought to look at 571. I'm going to stay away from the NAB for sour produced water and leave it for sweet produced water (per the old RP0475 guidelines).
user's latest post:
Zink anodes in Seawater coolers:...
Published (2009-11-25 11:44:00)
Generally you should not use the tape on the lowest threads, since the lower threads will cut it leaving loose pieces of tape in your cooler. Same with compound, put it higher up on the threads. Unless you skip the wrench and finger tighten only, you will not have an insulated joint. Even at low pressure, I would not skip the thread sealant. Tiny leaks have a way of getting worse.
user's latest post:
Corrosion of Exposed Structural...
Published (2009-12-01 14:36:00)
( The only problem is that to properly paint them they will need to be dismantled and preped \(blasted and washed\). If you are doing that then replacing them with HDG isn't much more effort. If you paint them you will need need to inspect and repair the coating regularly. , )
user's latest post:
Corrosion of Exposed Structural...
Published (2009-12-02 01:15:00)
Fair enough. I would go one step further, i.e. put my concerns in writing to the client. But the problem with this approach is that the property could change hands, in which case a new owner would be stuck with a substandard construction.
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Latest active threads on Corrosion engineering::
Started 3 days, 10 hours ago (2009-12-01 13:47:00)
by dik
Do the, what appears to be Dywidag threadbars, form the ziplines? These do not appear to be coated and should be; is this the problem? It is possible to clean and coat these with a zinc rich primer, but is a shorter term solution to HDG. Can the threadbar be replaced one at a time (low loading cycle) with a proper HDG bar? The replacement bar can be on site and replaced quickly. Because of ...
Started 2 weeks, 2 days ago (2009-11-18 09:49:00)
by unclesyd
I have never encountered any situation where this question would come up. This is not saying it couldn't happen but I've never seen it. As you probably know heat is the worst enemy of Nylon as it causes it to cross-link to for a gel, which is good for nothing. The only problems of similar nature that I'm aware of are: A QA compound in a cutting fluid did attack some Nylon bushings. A ...
Started 4 days, 12 hours ago (2009-11-30 10:58:00)
by TVP
I don't have any information regarding diffusion of ammonia gas through PU or nexprene seals, but ammonia will DEFINITELY corrode the copper components and degrade the conductivity of the contacts, etc. You should contact your seal provider(s) to discuss this application in detail.
Started 1 week, 3 days ago (2009-11-24 14:07:00)
by unclesyd
The Zinc has to be electrically connected to the part you are wishing to protect to be most effective.
Started 2 weeks, 1 day ago (2009-11-19 23:02:00)
by unclesyd
Check with your paint manufacturer as some can and some can not be used over flash rust. There are products that can be sprayed on the clean surface that will prevent the rust and can be painted over.
Started 1 week, 2 days ago (2009-11-25 07:24:00)
by metengr
Alazne; What is the material specification for this tubing? Is it under ASTM or EN or what? How much time are you spending at 1060 deg C? This is the cause of grain growth if you are spending more time than necessary at the solution treatment temperature. You don't simply add elements to avoid grain coarsening.
Started 1 week, 4 days ago (2009-11-23 06:35:00)
by strider6
( i'm not aware of any other standard on produced water material selection.. you can still find some good corrosion conference papers on the same issue.. Optimal Selection of Materials for Seawater Injection Systems: Testing in Deoxygenated Seawater http://www .onepetro. org/mslib/ servlet/on epetroprev iew?id=NAC E-96593&am p;soc=NACE &speAp pNameCooki e=ONEPETRO S , )
Started 1 week, 6 days ago (2009-11-21 17:16:00)
by rodneybennet
Please check Composite Agency ( http://www.composite-agency.com ), they might be able to help. Rodney
Started 2 weeks, 1 day ago (2009-11-19 17:59:00)
by gr2vessels
Refer to link below: http:/ /www.techs treet.com/ cgi-bin/de tail?produ ct_id=6826 Cheers, gr2vessels
Started 2 weeks, 1 day ago (2009-11-19 14:22:00)
by monkeydog
MIL-HDBK-5 does not speak to those aluminim alloys in regards to stress corrosion.
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Hot threads for last week on Corrosion engineering::
Started 3 days, 10 hours ago (2009-12-01 13:47:00)
by dik
Do the, what appears to be Dywidag threadbars, form the ziplines? These do not appear to be coated and should be; is this the problem? It is possible to clean and coat these with a zinc rich primer, but is a shorter term solution to HDG. Can the threadbar be replaced one at a time (low loading cycle) with a proper HDG bar? The replacement bar can be on site and replaced quickly. Because of ...
Started 4 days, 12 hours ago (2009-11-30 10:58:00)
by TVP
I don't have any information regarding diffusion of ammonia gas through PU or nexprene seals, but ammonia will DEFINITELY corrode the copper components and degrade the conductivity of the contacts, etc. You should contact your seal provider(s) to discuss this application in detail.
Started 1 week, 3 days ago (2009-11-24 14:07:00)
by unclesyd
The Zinc has to be electrically connected to the part you are wishing to protect to be most effective.
Started 2 weeks, 2 days ago (2009-11-18 09:49:00)
by unclesyd
I have never encountered any situation where this question would come up. This is not saying it couldn't happen but I've never seen it. As you probably know heat is the worst enemy of Nylon as it causes it to cross-link to for a gel, which is good for nothing. The only problems of similar nature that I'm aware of are: A QA compound in a cutting fluid did attack some Nylon bushings. A ...
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