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Thanks HTURKAK, My query was not really about an explanation of clause 9.4 and weld deposition repairs but rather what rules/guidance should be used for the minimum clearance between a main tank shell joint and a weld deposition repair.

Hello All, API 653 section 9.4 states that the shell can be repaired by 'deposition of weld metal'. My query is that if weld deposition repairs are carried out on the shell, what rules should be used with regards to minimum weld spacing requirements? I would typically use the guidance shown...

Thank you all for your comments. Best Regards

Hello All, I hope everyone is well and staying safe during these strange and difficult times. Just wanted some opinions regarding some terminology used in ANNEX F of API 650 13th Edition... The formula given to determine the Maximum Design Pressure (clause F.4.1) states that the value of 'A'...

Thanks JStephen!

Hello All, I am looking at a tank that was built in 1973. The tank is 180ft Dia x 74ft High. Design code is API 650 'App D'. The original drawings show that the shell material is OX522 D and OX522 C? I am not familiar with this particular grade of steel and am struggling to find any info on...

Thanks for your comments Geoff13. Best Regards

Hi all, I have been asked to carry out checks for roof frangibility and venting requirements on some existing tanks. However the tanks have had internal floating covers installed with half a dozen circulation vents fitted around the perimeter of the tank roof. Am i therefore correct in saying...

Gents, With regards to checking if the actual/existing shell thickness can take the higher loading due to the increased product density... From the inspection report would you use the 'average' thickness reading or the 'minimum' thickness reading found for each course when comparing against...

Thanks JStephen, Looking at API 653 Section 4.2.4 it clearly states that for a change of service relating to 'internal pressure' and 'operation at lower temperature than original design' the current applicable standard shall be used. It also states that for 'operation at elevated temperature'...

Hello all, I have an existing tank originally constructed in 1980 and the client now wishes to store a product with a higher SG value in the tank. All other design parameters such as pressure, temperature, corrosion allowance etc. will remain the same. The original design SG value is assumed...

Typically i allow more than the minimum lap required by the codes and standards to take into account weld shrinkage and cutting/burning tolerances of the bottom plates on site. The European tank standard 'EN 14015:2004' does actually specify a minimum lap of 60mm for the bottom plate to...

Hi JStephen, I had a thorough look through API 650 and also could not seem to find anything regarding this. I spoke to our welding inspector to see if he could shed any light on this but he advised that we actually do have a seperate weld procedure to cover us for welding stress relieved...

Thanks mech2325 for your comments and input on the subject. I will let you all know what answer API reply back with following the tech enquiry sent.

Hmmmm interesting JStephen....to save me some time what section or clause number in API 620 is this referenced? It will be interesting to see what API come back with regarding my technical query under API 650 if it is actually allowed in API 620. Will keep you posted on this either way!

Another area of debate is in Annex F where the term DLR (which is applied as a force not a moment) is used for calculating max design pressure, required compression area and calculated failure pressure. Again if the roof is insulated could this additional weight be included in the relevant...

Thanks JS & IFRs...you both make some good points as usual. I also prefer to take the more conservative approach and have the tank stable on its own merit and not be 'clutching at straws' so to speak...however i will send in a Tech Enquiry to API just out of interest...(thanks for the link to...

Hello all, With regards to the 3 uplift criteria in section 5.11.2.1 ( API 650 12th Edition Addendum 2 ). For the value of MDL is it acceptable to include the weight of the shell insulation if the tank is lagged? Similarly can we also include the weight of any roof insulation in the value for...

Thanks J Stephen for your thoughts on the subject.

Hello All, API 653 Fig 9.13 gives details for "tombstone" shaped patch plates in the critical zone and states the max dimension for these patches along the shell of the tank is 24 inches. It also gives minimum distance requirements between 2 tombstone type patches. I was just wondering what is...