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Thanks Andrew. I was really looking more at needing to protect an Aluminum structure if connected to a steel one. The carbon steel structure will be coated.

Thanks for the help!

That's exactly what I needed, thanks! The DNV credibility will go a long way with my clients as well. From one Steve to another - thanks again. -Steve

Hi. I'm doing a comparison of several metals to determine which should be used for a subsea component. How would I calculate the size & quantity of the anodes to be used on the component? I'm looking for the generic equations, I can fill in the required data. Thanks!

Hi. I'm doing a comparison of several metals to determine which should be used for a subsea component. How would I calculate the size & quantity of the anodes to be used on the component? I'm looking for the generic equations, I can fill in the required data. Thanks!

The British drive on the wrong side of the road, and place weld marks on the wrong side of the arrow... Makes sense to me.

Wow - Pretty complicated. You'll also need to take into account the object's shape and the coefficient of drag. Also, what kind of currents are you likely to encounter as it rises? You'll need to determine the drag on the moving object, and the increasing velocity due to air expansion will...

I have re-read your question and I'm afraid it's a little too complicated for me to answer on a message board. My gut says no, but again this would be a lengthy analysis. Making the silo airtight makes it even more complicated. The base equation you need to use is p1v1t1=p2v2t2. Temp will...

Sorry, running out of town. Don't have time to look at your question well enough to give an answer. Be back next week, or maybe someone else can help.

Thanks guys. Good replies all. The pipe diameter will not be consistent, so the tool will need to adapt from 13" to 36" diameters. Once I have built the tool I can empirically test the grip force - measuring the penetration depth would be a good idea. The cams are also a good idea...

The problem is a little vague, but I'll take a stab at it. First off, I get 60.5psi at a depth of 136ft salt water. Slightly less for fresh water(59psi). Secondly, you also need to take into account the length of the barrel. If it's like an oil drum then there won't be much difference, but if...

Wow! I was planning to go 10 times that (0.25) and be conservative. I guess a few more details might be in order. I am trying to clamp a tool onto the end of a casing (pipe) standing vertically. The casing will have been subsea a long time, but condition will not be known before hand...

Does anyone have information on the coefficient of friction for hard steel on hard steel subsea? The steels will not be lubricated, but obviously they will be wet! Any input or direction is appreciated.