I am trying to find a pump that can pump Jet A fuel that is at -55 to -60 degrees C. The pump itself will be outside the envirnmental chamber. Flow rate 500 to 3000mL/min. Jet A fuel has a Kinematic Viscosity of 13 Centistokes at -50C. Any pump manufacturer leads would be appreciated. I don't do a lot of low temp stuff myself but the one project I did work on had an Innomag pump(www.innomag.com) do some odd temperature cycling application that went down to -90 F.  Other than the casing frosting up on the outside it was fine.  
I have a large 54" dia. double suction circ water pump that has had underfile removed from each vane by weld build up and grinding back to the orignal vane profile. The impeller vane in the area of the welds has 1/4" to 3/8" high lumps over a 6" x 3" area near the exit width. The impeller exit width is about 16" and vane thickness is about 1". The pump turns at 360 rpm. My question is:

Will the lumpiness of the weld repair cause hydraulic imbalance at this speed? Will it cause major performance issues? I was told by the repair vendor that the channels are so big that the lumpiness will little to no affect.Suber-water pumps