hat
OD sou 8 a 12 3/4 nan. (203.2 323,8 mm), incl. Mi epesè, sou 4% nan OD 0,060 (1,67) 0,060 x (pa gen okenn nan pye nan longè // 3) (1.67 x pa gen okenn. Nan m nan longè) rapò nan 0,020 in./ft oswa 16.7 mm / m
eng
OD over 8 to 12 3/4 in. (203.2 to 323.8 mm), incl. Wall thickness, over 4 % of OD 0.060 (1.67) 0.060 x (no of ft of length//3) (1.67 x no. of m of length) ratio of 0.020 in./ft or 16.7 mm/m