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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
2) Hot Threads for Last Week
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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12
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39
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148
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Post:
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Corrosion engineering Posting activity graph:
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Top authors during last week:
user's latest post:
How to calculate/predict erosion...
Published (2009-11-05 21:37:00)
I need to predict remaining life or time of failure for a plate that is subjected to a perpendicular liquid force (water) with a velocity of 6.13 m/s. The plate material is 13 Cr and thickness is 1.38". How long does it take for the plate to thin out and perforate at the given 6.13 m/s liquid velocity? I tried googling (heheh, :)) for a simplified way to calculate (something like ballpark figure or rule of thumb) this but found out that...
user's latest post:
Black rust in WWTP
Published (2009-11-09 01:03:00)
Yes and I plan to do so, along with intrusive investigations. Several experienced materials and corrosion engineers are reasonably sure that it is macrocell corrosion but can't explain why it is occurring. It is difficult to believe that somebody else hasn't already studied and written about the situation I'm seeing. So far, the tally is 6 tanks in 3 WWTP over a 1000 mile range.
user's latest post:
H2SO4 AT LOW CONCENTRATION
Published (2009-11-11 09:23:00)
( Is there any chloride in the system? Even a few ppm could be a killer. Look here for good tips http:// www.outoku mpu.com/ap plications /documents /start.asp I would suggest that you look at duplex stainless grades, but you are going to need a high alloy material for any real durability at that temperature. , )
user's latest post:
H2SO4 AT LOW CONCENTRATION
Published (2009-11-11 08:42:00)
Sorry, 0,5% vol; liquid; water. I have to specify the material of piping. Thanks,
user's latest post:
Selective corrosion of 302/316
Published (2009-11-04 09:54:00)
I was asked to analyze a water calibration vane used in residential water system. The stem is 316 and the blade is 302 (blade is pinned in the slot at the bottom of the stem). The 316 is virtually eaten away, but the 302 only has surface roughness in the area in the slot. The tolerance between the max blade thickness and minimum stem slot width is 0.001" (crevice...
user's latest post:
How to calculate/predict erosion...
Published (2009-11-06 03:38:00)
Hansac, I think you will find that predicting erosion is similar to predicting women.........near on impossible........ You have given a velocity (is this the velocity it hits the plate at?), but major considerations as well are temperature and pressure, surface finish, angle of impact etc play a key role as well. You will also need to consider over what area it is hitting the plate ie have you a narrow jet impacting on one part of the plate,...
user's latest post:
Black rust in WWTP
Published (2009-11-09 00:08:00)
Can you take your corrosion products to an SEM and have them analysed (EDS)? That may reveal more info on the corrosion process.
user's latest post:
How to calculate/predict erosion...
Published (2009-11-09 06:34:00)
( there are some guidelines to calculate erosion-corrosion due to sand, like the DNV model \(it's a standard and a software\) http ://www.dnv .ru/Binari es/Predict ionOfSandE rosionInPr ocess_tcm8 3-8476.pdf but i don't know if they are applicable in your case. another model is the API RP 14E. S , )
user's latest post:
How to calculate/predict erosion...
Published (2009-11-09 21:32:00)
( The above are for fluid flow in pipes and are highly unlikely to be applicable to a jetting type scenario. , )
user's latest post:
TML stickers
Published (2009-11-10 15:27:00)
In the old days we had TML (code or ID) stenciled on the pipes. Today, we are using stickers and previous stenciled marks are still visible. I've seen reports from API 570 cert inspectors reporting negative corrosion rates???? rustbuster said it: "key is repeatability"
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Latest active threads on Corrosion engineering::
Started 12 hours, 46 minutes ago (2009-11-14 10:57:00)
by Compositepro
Aluminum is very quickly corroded by caustic conditions so I cannot imagine using it around ammonia. A little bit of moisture mixed with ammonia during a leak or maintenance and the aluminum will be gone.
Started 1 day, 23 hours ago (2009-11-13 00:18:00)
by rneill
There are a variety of different tools available depending on what type of anomaly it is you are trying to verify. examples include: - Hand Held Low Resolution Yoke: looks for cracks, surface breaking indications, etc. - A variety of hand held UT probes and tools are available that are good for evaluating either metal loss (general or pits) or cracks. - Automated UT is available and consists ...
Started 3 days, 15 hours ago (2009-11-11 08:29:00)
by unclesyd
You would consider this a weak acid, but under certain conditions it could be very corrosive especially at your temperature. One needs a little more information to give any advice. Is the 0.5% based on vol or weight? What form is the commodity? What are the other ingredients? What do you hope to accomplish?
Started 3 weeks ago (2009-10-24 00:45:00)
by SJones
( One of the results of passing current through an aqueous electrolyte is the generation of hydroxyl ions \(alkali\) or the reduction of hydrogen ions \(increasing pH\) at the cathode. Therefore, cathodes - the protected structure - tend to sit in an alkaline environment. In seawater this shift in pH brings about the deposition of calcareous deposits which can form a protective film. The ...
Started 4 days, 9 hours ago (2009-11-10 14:18:00)
by rustbuster
Hansac, We use various metons from paint stick to stickers to metal dymo labels, all are fine. The key is repeatability. We scan and record the average and minimum thicknesses. We always give the technicians the previous readings and ask them to interpret their findings by adding note. (Pitting, external corrosion, CUI, etc.) Growing metal is always a problem and there are many variables ...
Started 1 week, 1 day ago (2009-11-06 03:38:00)
by deco0404
Hansac, I think you will find that predicting erosion is similar to predicting women.........near on impossible........ You have given a velocity (is this the velocity it hits the plate at?), but major considerations as well are temperature and pressure, surface finish, angle of impact etc play a key role as well. You will also need to consider over what area it is hitting the plate ie have ...
Started 5 days, 23 hours ago (2009-11-09 00:08:00)
by kclim
Can you take your corrosion products to an SEM and have them analysed (EDS)? That may reveal more info on the corrosion process.
Started 1 week, 3 days ago (2009-11-04 13:33:00)
by EdStainless
( Is this potable water, or a heating system? Are you sure that it is 316? There are a number of crevice corrosion conditions that are worse for 316 than 304 \(or other non-Mo grades\). Some of these are related to microbiological activity. The Mo in the crevice liquid makes for a more aggressive fluid. With S I would suspect MIC. You should consider 2205 for this part. , )
Started 1 month, 3 weeks ago (2009-09-23 13:15:00)
by chrysa1975
Of the non-metallic materials, PTFE is wholly resistant to HF and hydrocarbons, but its use as a coating for repairs made in situ is virtually impossible because its polymerisation requires heat treatment under conditions which are hardly compatible with the facilities normally available when working on plant. Epoxy coatings do not withstand HF, even when present in traces. Also consult API RP ...
Started 2 weeks, 4 days ago (2009-10-27 08:58:00)
by CoryPad
There are many qualifiers to corrosion resistance, but a general statement can be made that corrosion resistance due to chloride ion varies from one alloy to another. For example, commercially pure Al (like alloy 1050) has much better corrosion resistance than alloy 7075-T6.
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Hot threads for last week on Corrosion engineering::
Started 1 week, 1 day ago (2009-11-06 03:38:00)
by deco0404
Hansac, I think you will find that predicting erosion is similar to predicting women.........near on impossible........ You have given a velocity (is this the velocity it hits the plate at?), but major considerations as well are temperature and pressure, surface finish, angle of impact etc play a key role as well. You will also need to consider over what area it is hitting the plate ie have ...
Started 3 days, 15 hours ago (2009-11-11 08:29:00)
by unclesyd
You would consider this a weak acid, but under certain conditions it could be very corrosive especially at your temperature. One needs a little more information to give any advice. Is the 0.5% based on vol or weight? What form is the commodity? What are the other ingredients? What do you hope to accomplish?
Started 1 day, 23 hours ago (2009-11-13 00:18:00)
by rneill
There are a variety of different tools available depending on what type of anomaly it is you are trying to verify. examples include: - Hand Held Low Resolution Yoke: looks for cracks, surface breaking indications, etc. - A variety of hand held UT probes and tools are available that are good for evaluating either metal loss (general or pits) or cracks. - Automated UT is available and consists ...
Started 5 days, 23 hours ago (2009-11-09 00:08:00)
by kclim
Can you take your corrosion products to an SEM and have them analysed (EDS)? That may reveal more info on the corrosion process.
Started 4 days, 9 hours ago (2009-11-10 14:18:00)
by rustbuster
Hansac, We use various metons from paint stick to stickers to metal dymo labels, all are fine. The key is repeatability. We scan and record the average and minimum thicknesses. We always give the technicians the previous readings and ask them to interpret their findings by adding note. (Pitting, external corrosion, CUI, etc.) Growing metal is always a problem and there are many variables ...
Started 12 hours, 46 minutes ago (2009-11-14 10:57:00)
by Compositepro
Aluminum is very quickly corroded by caustic conditions so I cannot imagine using it around ammonia. A little bit of moisture mixed with ammonia during a leak or maintenance and the aluminum will be gone.
Started 3 weeks ago (2009-10-24 00:45:00)
by SJones
( One of the results of passing current through an aqueous electrolyte is the generation of hydroxyl ions \(alkali\) or the reduction of hydrogen ions \(increasing pH\) at the cathode. Therefore, cathodes - the protected structure - tend to sit in an alkaline environment. In seawater this shift in pH brings about the deposition of calcareous deposits which can form a protective film. The ...
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