( m/sec) 8 10 12 15 20 25 30 (m/min) 480 600 720 900 1200 1500 1800 fpm 1575 2000 2362 3000 4000 5000 6000 管徑( mm) 32 0.4 0.5 0.6 0.7 1.0 1.2 1.4 63 1.5 1.9 2.2 2.8 3.7 4.7 5.6 90 3.1 3.8 4.6 5.7 7.6 9.5 11.5 100 3.8 4.7 5.7 7.1 9.4 11.8 14.1 125 5.9 7.4 8.8 11.0 14.7 18.4 22.1 150 8.5 10.6 12.7 15.9 21.2 26.5 31.8 200 15.1 18.8 22.6 28.3 37.7 47.1 56.5 250 23.6 29.5 35.3 44.2 58.9 73.6 88.4 300 3