Again enjoying the discussion.. as i always focus on cosntrution and installation of structure to be protected to make sure the integrity of the coating system and no shortings

Agreed. CP comes to play with coating damages and till then we need to reserve the cp system to operate an optimum level. Also my approach has always been to be on top of the pipe or structure construction and installation to make sure no serious or even minor coating damages are done on protected structure and also to avoid any rebar connections to the pipe which is the case in paved areas inside refineries .. Corrosion and CP engineers need to involve in the project right from the start of the structure to be protected is installed till backfilling or pavement in order to make sure designed CP system cater for the structure for designed life

Thanks for refeesher

Fascinating!

Excellent discussion .. despite having CP experience we learn .. we didn't talk about 100mV shift potential Citroen

Thank You - that was certainly different and thought provoking - I had not ever thought of this aspect of engineering until now.

We cannot measure a potential, but we measure potential differences in units known as volts. Gibbs Free Energy explains that there cannot be zero potential as the free energy fills any void. Therefore there cannot be a negative potential so we must examine the measurement itself. If we are using an old analogue voltmeter there must be current flowing through a coil that moves a magnet on a pivot against the elastic memory of a hair spring. the pointeris fixed to the magnet and adjutment can be made to the anchor point of the hair spring to zero the meter before a measurement is made. We set the instrument zero and measure the potential difference in relation to that zero. If we are using a digital multimeter it does noh have a hair spring but is entirely electronic. It consists of a series of capacitors and resistors that can be likened to cups and byepasses. The charges pass into the cup and when it is full pass on to the next cup. The value of each resistor is known and the eletrical capacity of energy (potential) is known. The wiring is designed so that the display shows the voltage or current flowing through the resistors to complete the measuring circuit. An oscilloscope displays the path of an electron across a screen that has to zero adjusted for each reading or series of readings. It is therefore the meter that sets the zeron for each 'pipe-to-soil VOLTAGE measurement. The ground contact electrode is not a reference potential. All of this is described in detail in Module01 of the CPN on-line Corresspondence Course at the following link. www.pipeline-corrosion-control.net/CorrespondenceCourse/Module01/index.html

Very informative

thank you so much

Can we say if we have disbond coatings using this method?

Thanks

Thanks for sharing.

Well presented.

Thank you so much . Frome Algeria too,

🎯 Key Takeaways for quick navigation: 00:32 Too *much cathodic protection can impact the external coating of buried pipelines, posing risks.* 01:53 The *upper limit of cathodic protection magnitude is recognized as -1200 millivolts, crucial to prevent coating damage.* 03:00 Understanding *the electrochemical interaction at the cathode is essential in discussing cathodic protection.* 07:20 Uncontrolled *cathodic protection potentials can lead to coating blistering, emphasizing the coating's critical formulation.* 09:23 Cathodic *disbondment tests, like the cathodic desponding test, evaluate coating resistance to cathodic protection effects.* 14:16 Coating *application errors, even with compatible coatings, can result in adhesion loss and coating failure.* 18:15 Modern *coatings, though effective, pose challenges in controlling cathodic protection current, requiring careful system management.* 19:49 Incorporating *sacrificial anode systems with long operating lives is a practical solution for controlling cathodic protection.* 21:55 Strategic *placement and design of coupons are crucial for accurately monitoring cathodic protection systems.* 23:42 Interference *currents pose hidden dangers in cathodic protection, requiring careful system design and monitoring.* 24:33 In *the next session, the discussion will delve into the risks associated with interference and continuity in cathodic protection.* Made with HARPA AI

Thank you. Frome Algeria

Can ACVG pinpoint coating defects as small as 0.1 to 1 sq.cm area at well-coated 3LPE pipelines??

Excellent

It is detailed but really an informative session, brining logical insights to relate CP as one of the barrier against MIC attacks to metallic structures. Much thanks and your exerted efforts are highly appreciated to share that SME knowledge.

Congratulations, very good videos. I watched them carefully. It was very instructive. How about a new one on field repairs?

Thank you for this informative session.

Neil Webb does not mention the Alexander Cell or the science behind these surveys which is based on electrical energy.

Thank you Dr Markus for sharing this invaluable information.

How much current magnitude can be applied for DCVG survey more then normal functioning current especially in dry environment like desert.and if it can creat an overprotetion is acceptable or not.thank you.

Tnx lot ...very useful information provided.

Remarkable webinar

Great channel this 👍

Woow very informative.

💯🙌

Thank you for your easy to understand way of teaching.

So professional and easy and clear to understand.

very goog explanation, Regards

Unbelievable informative video, thank you so much for your valuable contribution!!

Thankfully the DCVG equipment now is electronic and the mV difference is easy to record.

Excellent channel. The PCM data is difficult to interpret

Thank you for sharing !

Very good, thank you !

hi nice sharing

Vert interesting subject,Thank you

Great talk. Is it not possible to size defects against a coupon of known size?

Very informative to get knowledge on coatings with bite sized corrosion series sessions

Thank you for your useful training courses

Thanks for this video.

Excellent. Thanks Neil.

great presentation, i have a question: Steel and galvanic corrosion, have you ever find evidence of steel damaged by the lack of grounding in electrical powered machinery? I find some alarming signs steel degradation in many surface machinery and transport infrastructure ( conveyors ) on mining operations. I suspect some of the damage could be related with the effect you describe in the presentation (grounding problems). Thank you!