I work for a company that built refrigeration packages with oil flooded screw compressor; we had problems with our oil pump, screw type, supplier so we are looking for another one but it seems not easy to find. Our typical operative conditions of the pump, are the following:
P suction: 15-23 barg
Delta P: 3-5 bar
T oil: 40 - 90 °C
Flow rate: 500 to 2000 liters/min
In some applications, depending from the oil type, refrigerant can be mixed to the oil.

Please suggest me possible vendors for this type of pump, alternative solutions will be appreciate also.
Thanks.
Michele