Centrifugal petroleum pumps of ND type

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Application and design: Centrifugal double-entry pumps to handle petroleum products and electric pump units on their base intended for pumping petroleum products not having mechanical impurities and also water with petroleum products? admixtures. ND pumps - centrifugal, horizontal, single-stage with double-sided semi-volute supply of liquid to the impeller and volute discharge. The pump case has a joint in the horizontal plane. The suction and discharge branch pipes are executed in the lower part of the case owing to which the pump may be disassembled in order to replace the rotor components without disconnection of the pipeline and motor dismantling as well. The pump rotor is put in rotation by means of the electric motor through the coupling with rubber-bushed studs. The radial or radial thrust bearings serve as rotor supports. The impeller - is a double-entry one; in general, it allows to get balanced the axial thrusts. To prevent leakage of liquid along the shaft, the double end-face seals are used.

Liquid to be handled: Centrifugal double-entry pumps to handle petroleum products and electric pump units on their base intended for pumping petroleum products not having mechanical impurities and water contaminated by petroleum products admixtures. The content of solid inclusions in the mediums being pumped should not exceed 0,2% by mass and 0,2 mm in size.

Conventional alpha-numeric designation:

For example:
6NDv-Bt-E Y2 TY3631-066-05747979-96
where 6- is the diameter of the delivery branch pipe, mm, reduced by 25 times;
ND - is the double-entry pump;
b - is the high-pressure pump;c - is the medium-pressure pump;n - is the low-pressure pump;
B -is the fuel pump; Nm - is the petroleum main road pump;
t - single end-face seal; td - double end-face seal;
E - steel case;
Y2 - location category;


Conventional designation adopted for the characteristic curves:
Q - capacity, m³/hour;
H - head, m;
N - maximum consumed power, kW;
n - rotational speed, rpm;
 - efficiency, %;
- admissible positive suction head;

Summary table of technical data for the centrifugal petroleum pumps of ND type.

for the pumps with flow passage made out of the steel - 0,6 MPa (6kgf/cm²)
for the pumps with flow passage made out of the cast iron - 0,3 MPa (3kgf/cm²)