Blackmer NP Series Sliding Vane Pumps

NP Series pumps are designed to offer maximum versatility for handling a wide range of clean, non-corrosive fluids. The high volumetric efficiency and low slippage of these pumps means they require less horsepower and up to 50% less power when handling viscous fluids. The pumps are available in five port sizes ranging from 1.5 to 4 inches with flow rates from 5 to 500 U.S. gpm (19 to 1,893 lpm) and operating temperatures to 500°F (260°C). The versatility of the pumps allows them to be used in a variety of loading and unloading operations, including the difficult application of top-unloading railcars. The pumps’ tremendous suction capability also increases efficiency in the process of removing the “heel” out of a railcar or tanker truck.

The key to the NP Series’ versatility is Blackmer’s unique sliding vane design that provides sustained, high-level performance over a wide viscosity range. NP pumps are self-priming, meaning that they can run dry for short periods of time for priming and clearing lines of residual product. The pumps have a unique head and sleeve bearing design that allows a small quantity of fluid to flow from the discharge side of the pump to the bearings. This small, continuous flow of fluid over the bearing surfaces provides a hydrodynamic film, which minimizes temperature rise for longer bearing life.

NP pumps are also available in a 316 stainless steel SNP Series with port sizes ranging from 1.25 to 3 inches and flow rates from 2 to 265 gpm (8 to 1,000 lpm). While 316 stainless steel is used on all significant wetted parts, the sliding vanes and end discs are non-metallic, which reduces friction and eliminates galling.