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Would someone please define t2a in API 650 Section 5.6.4.5 (Variable Design Point). Thanks

What is the preferred method of attaching the top angle to the top of a tank shell, lap welded (Figure F-2 Detail b) or butt welded (Figure F-2 Detail d).

What is the logic in API 620 Section 6.9.2 (11th edition add 1)in allowing plates to not be staggered? Thanks

Is there any restriction on welding a thin gauge less corrosive sheet material over the existing tank shell and bottom. This would be done with lap welds and plug welds. Thanks in advance

I would like to place an NFPA 22 Fire Water Tank on a ringwall foundation. The tank is about 40' dia. Given the options for protecting the bottom underside, it would seem at first glance that the sand/lime mix with a ph of 6.5 to 7.5 would be the best option. However, finding the proper...

Can anyone give me the link to API Agenda Item 620-285 Appendix X Revision 4? Much appreciated.

Ok, let me try this again. I meant to ask about API 650 Add 2 Apx. Y

Does anyone have any insite to share regarding the new Monogram and Licensing Program discussed in APx Y?

Does NFPA 22 allow for tanks constructed in stainless steel?

How do I set up Compress when given mawp rather than internal pressure as the design parameter? Thanks

Must the Seismic freeboard in SUGII and III designs need to be added to the design liquid level. EC.3.1 states that these groups "indirectly influences the performance level expected of the tank." I feel that this is probably not necessary and is already accounted for since E.7.2 speaks of the...

What resource can give me the process to determine the theoretical design life of an API 650 AST. Thanks for the guidance.

Has anyone noticed that the stress thresholds requiring the use of an annular plate in Apx. X.3.2 are the same as when using carbon steel? That seems odd when the duplex allowables are higher.

Is anyone aware of a limitation for the size of double wall tank that can have a roof over the annulus space. This may go into NFPA 30 and I am caught between a customer and an engineer. The enginner says that there is a 20,000 gallon thresshold for tank with a covered annulus. Thanks for...

I am being asked to replace a 1/2" thick carbon steel course with a 5/16" thick stainless course. The course above the replacement is 1/2" carbon steel. I know you would not do this with a new tank but would this be allowed in API 653 or would section 9.3.3.2 disallow this by the "no more than...

Does anyone's crystal ball indicate how API 650 and 620 will classify Duplex (2101, 2205, etc.). Will it be placed in Apx. S or will it be treated as a carbon steel?

Any suggestions on double butt welding a 50' tank bottom. I had planned to put it on cribbing, but they the bottom shell ring would need to be welded to the supported bottom to weld out the corner weld and make the bottom closing seam to minimize buckling. Are there any better ideas? Thanks...

Any suggestion for choosing an allowable stress for an API 650 F and S tank with a design temp. in excess of 250 degrees. The umbrella roof needs to be designed per API 620 but it tops out at 250 degrees F. and my design temp. exceed this by over 100 degrees F.

Can someone provide the reason for the change in the Z formula from (V/100)^2 to (V/120)^2 in the last part of the formula? The same question applies to the H1 formula where it changed from (100/V)^2 to (120/V)^2. I know this is old news but your comments would be appreciated.