Was the field weld symbol in the past a circle that was filled in solid?
Resembling the all around weld circle in todays detailing.
I know the flag is the designator for field weld now and the circle is for an all around weld.
The External Floating Roof foam dam on my 180' diameter tank has paraphines from the crude oil. The secondary seal scrapes the shell during production and the paraphines fall into the Foam Dam. Once the heat of the day hits the papraphines they melt and run all over my roof deck. I plan on...
I know that this was done as a means to perform destructive testing on the tank shell girth and vertical seams. What was the procedure called and where can I get some information on this old practice? See...
What is the preference for the gaps that exist between the chime extension and the concrete ring wall? We currently have caulked and grouted gaps on several tanks but I don't see it mentioned in API 650 or 653. Tank built in 1951 per API 650. The gaps are 1/4" and vary in length around the...
We have a 180' diameter x 48'high crude oil storage tank with a Coflexip type roof drain hose.
The tank is in-service and one of the gaskets in the tank for the hose must be leaking because we are getting oil when we drain the roof water.
The topside of the roof is clean.
Has anybody ever...
Customer does not want to use stainless anymore. Something in the water chemistry is deteriorating the stainless. Is HDMW or HDPE a good choice for a screen that will be for the most part submerged underwater? Do I have to worry about hydrolysis with these materials? It could be any size...
We need to find the grain direction on a small piece of AR450 2" thick plate. All edges have been trimmed. We need to bend it and dont want to make the mistake of doing it parallel with the grain direction. Is there any simple test we can perform that will tell us the grain direction other than...
If an 80 foot diameter tank has been in service for thirty years and the manway does not have a repad, do we have to install a repad? Have had no service issues with the manway and the service history has proven that we should not modify the tank.
I have a new customer that is questioning what his predecessor did 9 years ago. Instead of using sand to backfill around the UST, he used iron ore taconite tailings. Has anybody done this before and has it had any negative issues on the integrity of the UST. I am assuming the UST has a tar...
I will be recertifying for 653 and the effectivity sheet for this cert says to use the Tenth edition of API 650 Add. 1 to 4. I was told by the API rep. that it is correct and to use that as study material. I have the Eleventh edition and she said I would have to buy the Tenth edition to take the...
I know there are allot of intelligent tankies out there, I have worked with some of them throughout my career. I will be working with a contractor that will be erecting numerous 80'D x 42'H tanks and there process in welding the bottom is not the best. 100% of their bottoms have been bowed and...
I have a brand new 80Dx42H API 650 tank that was painted before I got onsite. We have not performed hydro yet. Does API address this issue? I have never had a tank painted before Hydro before and I fear if any leaks exist, paint may cover the leaks especially in the upper courses where head...
