DN(mm) | Minimum Test Pressure (Bar) | Duration Time | ||
ISO2531-1998 | ISO2531-2009 | |||
K<9 | K≥9 | Preferred pressure classes | S | |
≤300 | 0.5 ( K+1) 2 | 50 | 40 | 10S |
350-600 | 0.5K 2 | 40 | 30 | 10S |
700-1000 | 0.5(K-1) 2 | 32 | 25 | 10S |
1200-2000 | 0.5(K-2) 2 | 25 | 25 | 10S |
2200-2600 | 0.5(K-3) 2 | 18 | 25 | 10S |