can you please advise me the vendor, which can supply the pump with 1 - 5 cub.m/h flow, 55 barg out and 2 m NPSHA. Assume that we should come up with positive displacement pump.
Centrifugal pumps could be used (depending on the viscosity). For heads of about 3000 ft, special high-speed centrifugals could be used. Best is to contact reputable manufacturers to ask for quotations.
Assuming clean fluid, no solids, a Goulds 3935 centrifugal multistage is a good pick. Very competitive in this flow range and cheaper than a recip style.