i am just a beginner to oil and gas sector . i am qc inspector and right now at the present moment i have to deal with design calculations too. i have a major doubt on api 6A ans 16A calculations. for api 6a double studded adapter i did design calculation using von mises stress for test and working pressure separately and both values is less than the minimum yield strength of the material.
and for api 16a lets say drilling spool(mud cross) 11" 5M with 2-1/16" 5m and 3-1/8' 5m outlets. for this i applied the same von misise stress calculation for the body(11") and the outlets separately and got the value less than the minimum yield stregth of the material and hence conclude design is safe within the limit.
is the methods fine ?? please help me out