Shipboard equipment

TO ISSUE THE DEMAND

SDEP

Submersible drainage centrifugal electric pump units SDEP100/20 (SDEP100/30) are made on ТУ У 29.1-03327760-004-2003 (АЭТА 062313.004ТУ) are intended for raising sea and the fresh water polluted by refinery waste , with temperature not above 70°C from the flooded premises of tankers. Pumped out sea water can contain an impurity of water polluted by mineral oil and have temperature up to 70°C. In emergency or contingency it can be used as an aid of water supply or water-outflow.

Table 1. Technical specifications.
 

Performance data	SDEP 100/20	SDEP 100/30
Delivery, m3/hour	100	100
Head, m	20	30
Minimal thrust, m	1,0	1,0
Motor power, kW	11,7	16
Rated operational current, A , at a pressure of a network 380	25,2	32
Rated operational current, A , at a pressure of a network 220	43	55
Power frequency, Hz	50	50
Sort of a current	three-phase alternating current	three-phase alternating current

Values of key parameters are specified at work of the pump on water with temperature 293K (20°C). Norms of parameters of the pump in table 1 are resulted for a nominal rating.

Characteristics

Typical characteristics of pumps SDEP 100/30 tested on water with density 1000 kg/m3 at synchronous frequency of rotation n=3000 rev/min, are presented on fig. 1 and fig. 2.


Symbols:
Q - pump delivery;
H - pump head
N - pump capacity;
n - EFFICIENCY of the pump

The complete set of delivery.

Completeness of delivery are stipulated by the contract. The typical complete set of delivery of the pumps of usual execution contains:
• the pump with the electric motor and start-up instrumentation ;
• the operational and accompanying forms (the passport, the configuration and the service instruction of the pump).
Under the separate contract the delivery of additional components is possible:
on installed length from the unit up to the stator - a submersible oil and gasoline proof cable, (length 35m);
on installed length from the stator to the onboard power source - the flexible oil and gasoline proof cable( 151 m).
• water horse to the pump
• the carriage for transportation;
• the repair complete set of spare parts (it is recommended for repair of three pumps);
• the certificate of the Register of navigation (delivery only to the sea craft supervised by the Register).
 

Design features.

The pump consists of the one-stage centrifugal pump and the electric motor of an alternating current of a special design. The driving wheel of the pump is forced on the console end of a shaft of the electric motor. The internal cavity of the electric motor with a winding of stator and rotor should be filled by a working liquid (for example, the distilled water).
Cooling of the pump is carried out by pumped over water. For pumping over sea water the details of the pump are made of bronze and stainless steel. In order to prevent premature corrosion of pumps by fresh water it is necessary to establish the pump so that during inactivity it had no constant contact to pumped out water.
The electropump unit after installation in a place of a regular arrangement is preferable to store in vertical position with a cavity of a stator filled with the working liquid, the horizontal arrangement of the electropump unit is supposed - in this case filling the cavities of the stator by a working liquid is made directly before engaging.

The description of a design of the unit
 

Submersible drainage electropump SDEP(fig. Б2) represents the single-block unit consisting of the centrifugal one-stage pump and the electric motor. The steel case of the electropump 20 which is simultaneously corresponds as a rose is put on the electric motor. During work the water gets into the pump, passes along the case of the electric motor and cools it. Rotation of a shaft of the electropump goes on clockwise. The electric motor consists from a stator and a rotor. Active parts of a rotor 2 and a stator 3 are made from electric steel sheets . The winding of a stator 7 is fulfilled by a special waterproof copper wire with polymeric isolation, the case of a stator 4 is made of steel. Conductors of a winding joins a current-carrying cable 12. The current-carrying cable is joined to conductors of a winding. At an end face of the top cover the terminal for connection of a ground wire is stipulated. The rotor of the electric motor has a short-circuited winding from copper rods (a squirrel cage). In bearing boards 5.,6 the bearing bushes 9 are pressed in which together with bearing plugs 8 and basic heels10 on a shaft 1of the electric motor form radial and thrust bearings. In annular grooves on centering spigots of boards are laid the condensing rubber rings 41 which protects the electric motor from penetration of sea water. The transport eye 11 is welded on the bottom 18, in an end face of the bottom there are two steel fuses 19 condensed by rubber rings 42 both intended for pouring and draining of a working fluid from the electric motor. The pump part of the unit is mounted on a face part of the electric motor and connected to it with a admission 24 by means of stud bolt 16. In a supply there is an aperture for current-carrying cable, sealed by a stuffing box 13 with a packing nut 14. The pump impeller 26 is forced on the free end of a motor shaft on a key 37 and is fixed by nuts. For unloading thrust bearing of electric motor from the axial thrusts, in a nave of the pump impeller are discharge openings and seal 27 on the inlet side of the wheel is stipulated.
Vaned tapping 25 is attached to a admission by means of stud bolts 30 to which the nipple 34 with a pressure head hose are fastened by means of link bolts 32 . Lip seal 38 warns penetration of sea water inside of the electric motor