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I believe JStephen refered to 5.8.6.3 if you are looking for that paragraph.

Hi, before asking the question I want to thank you for your time. I have a doubt on the standard wording. On API 650 5.7.7.6 you calculate the nominal thickness of the bottom reinforcing plate with the equations given. Later we have a note: tbr is the minimum thickness of the bottom...

It's pretty clear the procedure to find t2 in an inspection plane for a localized corroded area. My doubt about the procedure, once I get t2 and calculate the value of L with the 4.3.2.1.b equation. When I calculate t1, I have to get all the measurements 0.5 L on top of t2 location and 0.5 L on...

I understand. Do you belive I need to take into account only the uplift pressure using the PWR to calculate the counterbalancing weight or I also need to take into the account the moment MWS?

API 650 says this F.8.2 The counterbalancing weight, in addition to the requirements in 5.12, shall be designed so that the resistance to uplift at the bottom of the shell will be the greater of the following. a) The uplift produced by 1.5 times the design pressure of the corroded empty tank...

Thanks for your answer, The two additional lines you are adding to the graph, how do you interpolate them? Linearly on the graph or do you have to consider it is a logarithmic scale? I did get the equations for the three original lines from a/R (they are approximate) a/R = 0.005 KR/(E * 2 *...

Hi, I am trying to figure out how to extract the data from the P.2a to P.2l graphs. There is an example problem on P.2.9.1 and in the solution it gets a value of 3.1 x 10-4 for KR/E(2a) on Figure P.2a. I enter that figure and dont understand how to get that value. Is there a tabulated graph or...

5.2.1. b) Design External Pressure (Pe): Shall not be less than 0.25 kPa (1 in. of water) except that the Design External Pressure (Pe) shall be considered as 0 kPa (0 in. of water) for tanks with circulation vents meeting Annex H requirements Design Pressure shall not be less than 0.25 kPa...

I'm checking the intermediate wind girder requirements as per 5.9.6.6. Anyone know how to calculate h1 value when having multiple wind girders? From the standard I get the following: "h1 is the vertical distance, in meters, between the intermediate wind girder and the top angle of the shell or...

Thank you all, I will check all the references and do a FEA to pinpoint test accuracy and let you know

Hi, on API 650 paragraph 5.12.7 refers to AISI reference as an acceptable procedure for anchor chair design. When I check the reference in order to calculate shell stress an anchors there is a difference in the Z reduction factor with other references like Denis Moss Pressure Vessel Handbook...

Thanks both of you. I believe I figured out the weight distribution with your inputs and fixed the calculation spreadsheet.

Hello, I've been looking for some information on how to calculate the load distribution of roof plates in shell and columns. Table 5.21 of API 650 standard uses two areas, Arss and Arsc, being the area of tank roof supported by shell or columns. And also uses Wrss and Wrsc being the weight of...