PN MPa 10 15 20 25 32 40 50 65 80 100 125 150 200 250 300 350 400 450 500 600 ≤ 1.6 2.5 3 3 3 3 3.5 3.5 4 4 4 4 4.5 5 6 7 7 8 8 8 9 2.5 2.5 3 3 3 2 3.5 3.5 4 4 4 4 4.5 5 6 7 7 8 8 9 10 4 2.5 3 3 3 3 3.5 3.5 4 4 4.5 5 5.5 7 8 9 10 11 12 13 15 6.4 3 3 3 3.5 3.5 3.5 4 4.5 5 6 7 8 9 11 12 14 16 17 19 22 10 3 3.5 3.5 4 4.5 4.5 5 6 7 8 9 10 13 15 18 20 22 16 4 4.5 5 5 6 6 7 8 9 11 13 15 19 24 26 30 34 2