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Thanks! But if it is impermeable, how does whater get under the coating? Coating bonding would mean the adhesion of the coating to the steel pipeline. And electrical Bonding would mean?

So this means that the coating is not impermeable?

Thanks for the response. Im afraid I dont quite understand the terms "undercut by water and corrodents".

Good day all! Recently we carried out a peel test of the asphalt enamel coating on our cross country water pipeline. The coating was observed to be disbonded from the steel pipeline. Our pipeline is protected using an impressed current CP system along with sacrificial Mg anodes at many...

Thank you for all your replies. Currently we are looking to replace the damaged exchanger with a different exchanger from a defunct part of the plant. Meanwhile we are weighing the options of repair of tubesheet by weld build up, replacement of tubesheet, and replacement of entire tube bundle...

Thank you all for your valuable inputs. EdStainless, while replacement is definitely the ideal scenario, metengr's point is a valid one. Further, I dont think any tube replacement is necessary. Why is that you feel all tubes will need to be replaced? Thank you metengr for the reference to the...

Hello all, My question is regarding a shell and tube U-tube heat exchanger designed to ASME Sec VIII Div.1 1992 and TEMA 7th Ed 1988 Class R. The exchanger's tube sheet is 54 mm thk A105 Carbon Steel cladded with 8 mm SS216L. The carbon steel is suffering from severe metal loss after coming in...

Thank you for your reply gtaw. Any literature in the subject you could point me to?

Hello all, It is common knowledge that SMAW/MMA electrodes for carbon/low-alloy steels are available in a variety of flux coating options - rutiles, cellulosic, basic, and iron powder being the most common. The electrodes differ in their Hydrogen content, which is significant in controlling...

Hello all, It is common knowledge that SMAW/MMA electrodes for carbon/low-alloy steels are available in a variety of flux coating options - rutiles, cellulosic, basic, and iron powder being the most common. The electrodes differ in their Hydrogen content, which is significant in controlling...

Hello all, It is common knowledge that SMAW/MMA electrodes for carbon/low-alloy steels are available in a variety of flux coating options - rutiles, cellulosic, basic, and iron powder being the most common. The electrodes differ in their Hydrogen content, which is significant in controlling...

Sorry. Struggling with attaching the photos. Here are some more:http://s52.photobucket.com/user/shaafi/media/7_zps9abb9d17.jpg.html http://s52.photobucket.com/user/shaafi/media/1_zps9262db34.jpg.html http://s52.photobucket.com/user/shaafi/media/2_zps6b89675a.jpg.html...

Attached are some pictures of the failure we experienced on the roofs of our tanks. Interestingly enough the paint on the tank shells did not deteriorate very much. http://s52.photobucket.com/user/shaafi/media/3_zps1981a928.jpg.html

Many thanks for your suggestions! I am looking into polysiloxane and thermal spray aluminium. Im also going through ISO 12944 which has some useful info. I will try to update this thread with some pictures of the failure mode of our original system. I strongly suspect that the failure was...

I am responsible for upgradation of the external paint system on a number of carbon steel aboveground storage tanks at a chemical plant. The environment that the paint system will have to protect against is: 1. Marine conditions - we are a stones throw from the sea. 2. Moisture - Spray of...