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For large diameter tanks with intermediate rafters, should they be fixed at the girder or allowed to move?

Clause 3.4.1 in API 650 states that sketch plates shall have a minimum nominal width of 72 inches. Usually on a floor plate layout there are 4 pieces that are "pie" shaped. Does this mean that one or both sides of this "pie" must be at least 6 feet from the lap to the...

Attn.: jproj: I have completed a masters in engineering at the University of Texas at Austin. After completion of the program I started working as a construction management assistant and now I work as a project manager/engineer. I feel that the knowledge I gained during my masters was...

See API 650 - 6.1.1: "Radiograph inspection is not required...welds in nozzle and manway necks made from plate..."

IFR Thanks, my email is terrythompson@sprint.ca. Regards, Terry

HI John: Thanks: I would have to agree with you. I think it is likely that Table 3.6 was not updated in the last addendum and Figure 3-22 was updated. Regards; Terry

API 650 Table 3-6 indicates that for a 24" manway the distance between the toe of the weld on the repad and the bottom to the tank is approximately 3". However, when I use figure 3-22 it indicates that unless the weld is heat treated this distance should be 10". Am I right in...

I am haveing a problem with water running down the side of the tank and entering the interstitial space between the liner and the bottom of the tank. The liner is sandwiched between the the tank and ground with asphalt impregnated fiberboard as per API standard detail. Has anyone else had this...