ISO 15614-1 Table 9 - range of qualification for branch connection diameter

Range of qualification of pipe shall not less than 0.5D.
Please advise diameter “D” consider branch pipe or man pipe?

D is diameter of pipe, including main-pipe and branch pipe.

Example: nipple NPS 1" (33.4 mm) to main-pipe NPS 6" (168.3 mm), the diameter “D” will be 33.4/2 = 17 mm for nipple and 168.3/2 = 84 mm for main-pipe.

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