SR. NO. PR. BAR OPERATING INLET STEAM BACK PR. CAPACITY – Kg / hr PUMP SIZE BAR 25 NB 40 NB 50 NB 80 NB 100 NB 1 7.0 1.0 1220 2115 3210 5115 6850 2 7.0 3.0 1015 1800 2675 4610 5940 3 7.0 4.5 1010 1580 2615 4405 5430   4 5.0 1.0 1100 1875 2875 5050 6180 5 5.50 2.5 1210 1925 2810 4685 5400 6 5.50 4.5 930 1625 2325 3950 4800   7 3.5 1.70 1100 1850 2935 5125 6050 8 3.5 2.0 1050 1695 2655 4575 5260 9 3.5 2.5 925 1465 2150 3680 4325   10 1.50 0.35 1050 1920 2775 4760 5860 11 1.50 0.75 935 1750 2300 4175 4912 12 1.50 1.0 945 1520 2355 3850 4060   Capacity Multiplying Factors for motive Air/gas % BACK PRESSES VS. MOTIV PRESSURE (BP / MP) - 10%       20%       50%       60%       80%   1.05       1.08       1.18       1.20       1.35 Capacity Multiplying Factors For Example – If 40NB pumping trap is giving capacity of 1925 Kg/hr with 5 bar (g) inlet steam pressure and 2.5 bar (g) back pressure then the (% B.P/M.P = 2.5/5) = 50% i.e. the capacity multiplying factor is 1.18 Hence Capacity with Air = 1.18 x 1925 = 2271 Kg/hr