Welcome to the aboveground storage tank forum, a bulletin board dedicated
to tanks, fuel tanks, plastic tanks, fuel storage tanks, and above ground storage
tanks (AST) API650, API653 & UL142
aboveground storage tanks (AST) and chemical plastic tanks. Remember the forum
is made up of volunteers from experts to beginners. Unfortunately, we cannot allow free commercialism that promotes products, services, or sites.
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roof columns bases - Tuesday, April 05, 2011 - MIROSLAV [879]
There are traces of corrosion between the floor and roof support base according to the attached image. I am interested in temporarily removing the center column with its base to inspect the tank floor. this column can be removed without risk of the roof reaches yield or collapse?? more roof beams weighing 2 tons and has a gradient of 5 ° be risky if this operation, as I can estimate and install a temporary support system that allows me to temporarily support the weight of the roof until you finish the work on the floor??
Click on picture for full size view or to view PDF!
Re: roof columns bases - Tuesday, April 05, 2011 - MIROSLAV [879]
any suggestions on sizing method or procedure for temporary support material, type of support, metal profiles, seamless pipe, etc any experience?? what do you think about the next image??? this is only an idea, it was installed only as a proposal submitted
Click on picture for full size view or to view PDF!
I second Davids advice. Man, anyone that has any experience at all in jacking columns or floating roofs will tell you that this can be one of the most nerve-racking things that can be done in tank repairs. I have seen jacks slip out, shoot out, and even bust apart. Even seen the column lug welds break loose and the jacking beam hit a guy in the head knocking him smooth out. That all said just to remind you that these things happened to experienced and talented tank crews. My advice is to hire one of those tank contractors to do this job. They have the experience, know-how, and engineered equipment to do the task without hurting personnel or your tank. Good luck in whatever you decide.
I see this done often enough column jacking but seldom like this. Although somewhat unorthodox, the basic geometry of what you show looks acceptable for static loads. How do you get the column up? There will be sidewards loads due to field conditions and the diagonals will be in combined bending and compression. You need to check the weld strengths and member stresses - use a factor of safety of 3 or more to be safe. Your situation is better than many - the loads are light - only 2 tons and you are not cutting the column, just picking it up a little so if the cribbing fails the column will just fall an inch or so. When done, seal weld a wear plate under the column plate and restrain the column plate from moving with angle clips. See API 650 figure 5-26, the bottom picture.
Tankies have a tool called a hair pin. It is two pieces of I beam with a pin at one end to join the two pieces. The pin needs to be heavy enough to carry the load you are going to put on the I beams. Two ears are welded on the column with 1/2 inch or thicker depending on how much weight will be lifted. The I beams rest on the bottom of the ears. The pinned end is supported with heavy skids and the open end has a piece of I beam placed under the pinned I beams. A 20 ton hydraulic jack is placed under the I beam and this jacks the column. You have to be careful on T columns as you can bend them really easily. Jacking a floating roof is another thing as you have to be careful on where the jack is places so as not to bust welds on the floating roof.
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4611 Broad River Road, Suite I
Forum 
There are traces of corrosion between the floor and roof support base according to the attached image. I am interested in temporarily removing the center column with its base to inspect the tank floor. this column can be removed without risk of the roof reaches yield or collapse??
I second Davids advice. Man, anyone that has any experience at all in jacking columns or floating roofs will tell you that this can be one of the most nerve-racking things that can be done in tank repairs. I have seen jacks slip out, shoot out, and even bust apart. Even seen the column lug welds break loose and the jacking beam hit a guy in the head knocking him smooth out. That all said just to remind you that these things happened to experienced and talented tank crews. My advice is to hire one of those tank contractors to do this job. They have the experience, know-how, and engineered equipment to do the task without hurting personnel or your tank. Good luck in whatever you decide.
Industrial Training School and AIS Forensic Testing Laboratory.
