Gear pump selection

Are the parameters correct? The diameter is so large, but the flow rate is so low. What about the viscosity?

The flow rate is incorrect; the inlet and outlet sizes do not match the flow rate. For DN25 connections, the flow rate can generally reach 3 m³/h. Additionally, the operating temperature you are using exceeds the typical range for gear pumps; for a temperature of 350°C, it is recommended to use an RY-type air-cooled hot oil pump.

The American Wickham gear pump can do it!

● Applications: Suitable for transporting lubricating oils or other liquids with properties similar to lubricating oils that contain no solid particles or fibers, are non-corrosive, have a temperature not exceeding 80°C, and a viscosity of 5×10-6 to 1.5×10-3 m2/s (5–1500 cSt). ● Application scope: Can be used as a transfer and pressure-boosting pump in oil transportation systems ； 　　Fuel pumps that can be used for conveying, pressurizing, and injecting fuel in fuel systems ； 　　It can be used as a lubricating oil pump in all industrial fields. ● Structural features The gear pumps in this series are mainly composed of gears, shafts, pump bodies, safety valves, and shaft end seals. The gear, having high hardness and strength due to heat treatment, is mounted together with the shaft inside a replaceable sleeve to operate. The lubrication of all components inside the pump is automatically achieved using the output medium while the pump is in operation. 　　The pump features well-designed oil discharge and return channels, which minimize the torque exerted on the gears during operation; as a result, the bearing load is low, wear is reduced, and the pump’s efficiency is high. 　　The pump is equipped with a safety valve for overload protection; the full reflux pressure of this safety valve is 1.5 times the pump’s rated discharge pressure, and it can also be adjusted as needed within the allowable discharge pressure range. However, note that this safety valve cannot be used as a pressure reducing valve for long-term operation; one can install another one on the pipeline if necessary. 　　Looking from the outer end of the spindle toward the pump, it rotates clockwise. ● Performance parameters of KCB type gear pumps
Model Flow rate Q Rotational speed n (r/min) Discharge pressure p (Mpa) Required steam corrosion allowance r (m) Efficiency η (%) Motor capacity (m3/h, L/min) Power (KW)
KCB-18.3 1.1 18.3 1400 1.45 5 44 1.5 Y90L-4 2CY-1.1/1.45
KCB-33.3 2 33.3 1420 1.45 5 44 2.2 Y100L1-4 2CY-2/1.45
KCB-55 3.3 55 1400 0.33 7 41 1.5 Y90L-4 2CY-3.3/0.33
KCB-83.3 5 83.3 1420 0.33 7 43 2.2 Y100L1-4 2CY-5/0.33
KCB-135 8 135 940 0.33 5 46 2.2 Y112M-6 2CY-8/0.33
KCB-200 12 200 1440 0.33 5 46 4 Y112M-4 2CY-12/0.33
KCB-300 18 300 960 0.36 5 42 5.5 Y132M2-6 2CY-18/0.36
KCB-483.3 29 483.3 1440 0.36 5.5 42 11 Y160M-4 2CY-29/0.36
KCB-633 38 633 970 0.28 6 43 11 Y160L-6 2CY-38/0.28
KCB-960 58 960 1470 0.28 6.5 43 18.5 Y180M-4 2CY-58/0.28
KCB-1200 72 1200 740 0.6 7 43 37 Y280S-8 KCB-1600
95 1600 980 45 Y280S-6 KCB-1800 112 1800 740 0.6 7.5 43
55 Y315S-8 KCB-2500 150 2500 985 75 Y315S-6 KCB-2850 170 2850 740 0.6 8 44
90 Y315L1-8 KCB-3800 230 3800 989 110 Y315L1-6 KCB-4100 245 4100 743 0.6 8 44
132 Y355M1-8 KCB-5400 325 5400 989 160 Y355M1-6 KCB-5600 330 5600 744 0.6 8 44
160 Y355M2-8 KCB-7600 460 7600 989 200 Y355M3-6 KCB-7000 420 7000 744 0.6 8 44
185 Y355L1-8 KCB-9600 570 9600 989 250 Y355L2-6

http://www.nikunipump.com/pro_FPwoliu.html Shanghai Nikunipump Co., Ltd. does an excellent job in producing pumps with low flow rates but high head; the address is listed above.

Design or modification, pump selection: flow rate, head, medium and temperature, viscosity, operating conditions. Agree with the person above; high temperatures make it impossible to use gear pumps!