파이프 둘레 + 파이센터잡기+원주율3.14

asme b36.10m에 의거한 배관 파이프 외경지름 1/8'' 10.3mm 1/4" 13.7mm 3/8'' 17.1mm 1/2" 21.3mm 3/4'' 26.7mm 1" 33.4mm 1.1/4" 42.2mm 1.1/2 48.3mm 2" 60.3mm 2.1/2" 73mm 3.1/2" 101.6mm 3'' 88.9mm 4" 114.mm 5" 141.3mm 6" 168.3mm 8" 219.1mm 10" 273mm 12" 323.8mm 14" 355.6mm 16" 406.4mm 18" 457mm 20" 508mm 22" 559mm 24" 610mm 26" 660mm 28" 711mm 30" 762mm 32" 813mm 34" 864mm 36" 914mm 38" 965mm 40" 1016mm 42" 1067mm 44" 1118mm 46" 1168mm 48" 1219mm