Vortex electric pump units of AS-VK type (hereinafter referred to as the units) are intended for pumping neutral, short-aggressive, harmful, and highly explosive liquids with kinematic viscosity up to 36*10-6 m²/s (36 sSt), with content of solids not more than 0,01% by weight and the size of particles not more than 0,05 mm, in which the materials of flow passage not permit linear speed of continuous corrosion more than 0,1mm/year as per GOST9.908-85.
For nuclear power engineering use the pump units AS-VK and AS-VKS are designed in conformity with delivery contract and technical requirements of the Customer. To order the unit one should indicate:
- conventional designation of the unit;
- production system in which the unit will be operated;
- safety class as per PN AE G-01-011-97;
- equipment group as per PN AE G-7-008-89 (in case of necessity);
- earthquake resistance level as per NP-031-01.
Pumps being a member of the electric pump units are related to the items of specific purpose (IKN) as far as the reliability parameters are concerned, item aspect I (repairable ones) as per GOST 27.003.
The unit consists of the pump and driving motor, mounted on the common foundation frame and interconnected by the elastic coupling. Above the coupling there is a protective housing.
Pump – vortex, single-stage, horizontal, cantilevered.
The impeller which is a disk with radially positioned blades moves the liquid along the ring channel giving it the necessary energy.
The working chamber of the pump flow passage is executed within the casing, casing cover and spacer and is a ring channel connected with the inlet and outlet pump nozzles. The suction and delivery parts of the channel are divided by a bridge (cutter-off).
The impeller is keyed on the shaft and has the possibility of free movement in the axial direction. Holes in the disk unload the impeller off the axial forces.
The pump shaft rotates in two ball bearing supports, fitted in the pump bracket.
The direction of shaft rotation has no matter for the pump and is defined only by the pipelines position and by precondition concerned with proper transfer of the liquid being pumped from the suction pipeline to the delivery pipeline along the big arc.
The shaft of the pump is sealed by double or single end-face seal.
At Atomic Power Stations:
|Flow (nomin.), m³/h||2|
|Pump power input (max.), kW||4|
|Rotation speed, rpm||1450|
|Rotation speed, c˜¹||24|
|Pump inlet pressure, MPa, max||0.25|
|Pump inlet pressure, kgf/sm², max||2|
|Pump outlet pressure, MPa, max||0.85|
|Pump outlet pressure, kgf/sm², max||8|
|Pump unit efficiency,%||26|
|Type of current||AC|
|Admissible positive suction head, m, max||5|
For example AS-VKS1/16-К-TD-U3.1 TU 3631-326-00217975-2009, where: