In API 650 according to item 18.104.22.168 e , the fixed roof tanks require top angle of minimum sizes and this angle is a curb angle that is attached to both shell and roof , now item 22.214.171.124 say that when the angle is located 0.6 m below the top of shell , so we must put angle at the top , so I am confused between 126.96.36.199 e that says we must put a top curb angle and between 188.8.131.52 that says that if the angle is below the top by 0.6 m , how can it be below the top when item 184.108.40.206 says that it must be at the top ?
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