Corrosion Measurement

It is done by ultrasonic thickness testing, visual examination and hydraulic testing in the presence of the Engineer/Surveyor for the insurance company that is providing burst, fire and collapse indemnity insurance cover for the facility.

<...output in 4-20mA, HART & which can detect local pitting and overall corrosion....> is abstruse nonsense.

Thanks slack,

If not measurement can i monitor corrosion level in the pipepline ?any transmitter is available for the same ?

_{Holy mother of Murgatroyd....}

It is usually better to select process containment materials from those that will have no long-lasting effect in contact with the process fluids! That's why Engineers design and specify piping systems and not some bloke from the local chip shop!

Yes, I think it is a professional NDT work rather than putting some instrument online. Corrosion is chemically degradation of the material by chemical reaction and sometime sample is taken for testing on SIMS and ESCA type instruments. Yes, ultrasonic is a good idea if there is a lot density changes.

Pepperl & Fuchs and Honeywell had in-situ, on-line, corrosion monitors, maybe 5-6 years ago. Pepperl & Fuchs carried a name like CorrTran MV. Honeywell was SmartCet. I'm not sure if either still has them.

Primary variable via 4-20mA, 3 other variables available via HART. The insertion probe had multiple electrodes. A system really needed HART to exploit the full potential.

Thanks iris, will look into it. If you have any app note/case study can you share ?

Please convince the forum that this equipment is subject to periodic insurance examinations at present?

Anything which can give output in 4-20mA, HART & which can detect local pitting and overall corrosion.
HUH? Typical is to do an ISO dwg on the piping locating minimum wall and mark the location. Come back in a given amount of time and measure again. The time the unit was in operation vrs the corrosion from the last inspection gives corrosion rate. Look up ASME specifications and calculate the remaining life.

Addition: Panametrics use to make an excellent recording T gage (ultrasonic), the location was entered in whatever location was on the ISO Dwg. The unit set up the parameters of the test according to the last measurement so the same setup would occur. The entire scans in a given time period were recorded in EXCEL so an overlap of corrosion measurements could be shown. This gave an excellent view of preferential corrosion points like in a vessel and was a good record system.

Here's a link to the Honeywell transmitter. I have no app notes.

https://www.honeywellprocess.com/en-US/explore/products/advanced-applications/operations-excellence/asset-management/corrosion-prediction-modeling-and-material-selection/Pages/smartcet-corrosion-transmitter.aspx

In power plants, large HVAC (district) plants, and others, for the cooling water lines, heat exchangers, etc. Corraters (linear polarization resistance) can be used, along with corrosion coupons left in the system for 40 days, typically. Here is a link to the company that manufactures this equipment, and they are expert in application engineering.

http://www.google.com/url?sa=t&rct=j&q=corrater&source=web&cd=1&ved=0CCoQFjAA&url=http%3A%2F%2Fwww.cosasco.com%2Fcorrater-lpr-monitoring.html&ei=WWHdUYrGHIvw8ASq9YDYDQ&usg=AFQjCNEbNnLCLRIEQLOv99sx-lRP8i29Kg&bvm=bv.48705608,d.eWU

Here is a couple pictures to go along with that link:

probes, next picture is one of their transmitters. So, the answer to your question is undoubtedly yes.

Even with the specification of "oil, gas, and power plant" arenas, asking "to know how corrosion measurement is done in industrial applications" is a relatively broad inquiry nowadays.

Actual physical measurement / quantification of (the extent of) corrosion that has taken place (past tense) is certainly accomplished via ultrasonic, visual (including borescopes / crawlers), and even real-time radiographic inspection methods.

In the past few years, there has been developed the technology for "listening-to" (Acoustic Emission Testing) the actual corrosion mechanism(s), including pitting, at work.

An excerpt from a "MISTRAS Group" paper:

"The applicability of the acoustic emission (AE) technique for the location and occurrence of corrosion damages in metallic structures is well known; systematic tests have been conducted in the laboratory and field."
...
"Corrosion detection has been carried out by using acoustic emission measurements (Pollock et al., 1986) in different industrial scenarios, SCC in stainless steel, duplex steel and aluminum alloys (Yuyama et al., 1984, 1986), establishing the characteristic frequencies and amplitudes at which SCC occurs..."

(in one test)--- "After setting up the corrosion cell for 30 minutes in the 5% NaCl solution, the AE detection was initiated..... AE signals were easily detected with strengths above 40 dB_AE"

There is also available (via ASNT's web-store) Nondestructive Testing Handbook, Third Edition: Volume 6, Acoustic Emission Testing which contains a great article:

Active Corrosion Detection Using Acoustic Emission

Your post (to repeat) is a bit "open-ended", as the envelope is being pushed "way out there" in many specific applications. As posted elsewhere (_^here/CR4) Remote Field testing is finding more and more applications. Eddy Current testing is favored for many boiler-tube inspections, as it is great for measuring the thinness of certain articles (not so good at thickness, due to limited penetration). Likewise, guided wave UT (torsional wave) is gaining popularity as a "screening tool" (for pretty long pipe runs at a time, in some cases). Here's hoping that you find what you need....

Very good post, Tom. I also had read somewhere about AE testing, but was not aware of the advances this has made in recent years as to field testing. Certainly NDT is the correct answer to assess corrosion that has already taken place, and the exact method employed depends on the application.

I think we agree the OP should consult with a professional company that deals in all matters related to corrosion testing.

"Amen"... ("the OP should consult with a professional company that deals in all matters related to corrosion testing")

ESPECIALLY when dealing with oil/gas/petrochem companies.

NACE provides outstanding training (and certification) for corrosion professionals. (Not to 'shortchange' ASNT's contributions...)

Likewise, SOME issues require other 3rd party training and certification. One issue soon to be facing all of the oil/gas/petrochem companies in the U.S. will be PMI (to API RP 578). Due to several recent incidents (explosions/fires/fatalities), the origins of which were traced back to faulty material data/spec sheets, all such companies will soon be mandated to perform PMI on each and every piece... from 'all-the-way-downstream to all-the-way-upstream'.

And ... (what are we talking about here, in this thread?) ... if one is going to sell one's services as being able to "monitor corrosion", they had better likewise be capable of testing to verify that the right materials are joined-together at every juncture, so as to minimize that corrosion risk. (again, most likely soon to be mandated)

I am in the Oil & Gas business. Generally, we are very knowledgeable about our business, and the little knowledge you will glean in this forum is not going to impress us much at all if you are looking at a sales pitch of any sort, let alone be of much value in a site-meeting amongst professionals.

Now be a good fella and type 'corrosion measurement pipeline output signal' in Google search, and start doing your homework properly.

The assistance offered is in your own best interests...good work = good luck!