Non-destructive testing sampling ratio issue
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The storage tank has a diameter of 21 meters, and the sheet material used has dimensions of 2*12 meters. The sampling rate for \"T\"-joints is 25%, for longitudinal joints it is 3%, and for circumferential joints it is 4%. How many ‘T’ stitches and how many loop stitches should be taken? How many longitudinal seams?
Make a layout diagram and it will appear
Take 1 out of 4 T-joints per strip plate
3 T-stitches, 2 longitudinal stitches, 9 circular stitches