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Even if you had water, there isn't enough of a potential difference between CS & SS to worry about galvanic corrosion. 316L is preferred over 316 with 316L welding rods. It is commonly done as MJC suggests.

So it's submerged in crude???? I thought it was on the TOP of the tank.

How can galvanic corrosion take place when there is no electrolyte present? Is the hatch and steel lid submerged in water?

Why don't you use electric heat tracing instead?

Since the cladding is on the inside of the pipe, there is no electrolyte present and hence, no possibilty of glavanic corrosion betwenn the classing and the ID of the steel pipe. As for the corrsion test on the outer pipe, the only thing I can think of is they want to know the exact electric...

Michelsen: 1. Why would you choose carbon steel for seawater service? 2. Why would the system be designed to deluge water on electrical equipment? Use potable or treated water to conduct the test or to flush the seawater out after the test. Protect the electrical equipment with shrouds or...

What I've done is a trial and error approach. Adjust the tray efficiency to match your actual input/output conditions. When you get a match, you've got your answer.

My vote is the Manhattan Project with Gen. Leslie Groves as the greatest project engineer of all time.

1969: MortenA is correct. I've also seen this situation on a blowdown line when the limiting factor is the flare capacity.

farzinchemical: To expand on Art's point about complete information, one possible case you did not mention is gas blow-by from an upstream separator. Your vessel sounds like a LP or IP separator - do you have an HP separator upstream? If so, does the liquids from that separator go to the...

bvi: Is there an equivalent "31.3 rule" in 31.8 or API RP1111 regarding low temperature excursions when the corresponding pressure is lower? I don't have a copy of either and I was curious.

You'll get a much better audience for this question if you post under "Off-shore Structure/Pipeline Engineering" or "Petroleum Production Engineering"

You're kidding yourself if you think you can solve this problem by reading up on it. You need an experienced engineeer in pipe stress and finite element analysis. The dynamic effects you describe are particularly problematic. I urge you to get help on this otherwise the consequences could be...

What's the "NRC" and what do they use instead of 31.3?

mytsurfer: You posted a similar question on sockolets back in Sep 03. You even spelled sockolet correctly. You were given the nformation you asked for along with a useful URL. It took me about 3 seconds to find your original post. Can you not search the site or even remember your own question?

jte: Good one! Pegasus2: Your question is convoluted and nonsenical. What are you trying to do? Bleed rings come in standard sizes and flange pressure ratings. Sounds like you need one for an ANSI 300# system. MAWP of ring is determined by the ring wall thickness - which is whatever you...

Would not a minimum flow spillback line solve the problem?

MattD: What you want is a "choke nipple". It is a small length of pipe with a 1/4" bore. It is very common to install these devices on a drain from a high pressure source to a low pressure source. Sorry, but I couldn't find any website for sales/reference.

EddyC: Awarding engineering services to the lowest bidder on any federal (and to my knowledge) any state public works project is illegal. It's called the Brooks Act. Look it up.

Your asking for a generalization where one doesn't exist. There is no "common allowance" for gas carry under. What will determine the allowable amount will be specifications for maximum vapor pressure for the oil. This will come from either the pipeline company or the end user (the refiner)...