OPTIMEX CIRCULATION PLANS ACCORDING TO API 685

Vous êtes ici :

OPTIMEX has established 4 main categories to designate the circulation of the pumped liquids in the canned motors.

 

In order to complete the designation of the API 685, OPTIMEX established its own designation (with the letter of the category followed by a number).
The table hereunder defines, from the table on the right, the circulations most commonly suggested to our customers.

 

On demand, we also propose a bigger variety of circulations, depending on the pumped liquids.

CATEGORY

LETTER

PUMPING TYPE

NormalNClear liquid, non boiling, hot or cold
OverpressuredSClear liquid, boiling, hot or cold
CooledRClear liquid, hot
FilteredFLoaded liquid, hot or cold

PRINCIPLE DESIGN

DESCRIPTION OF THE CIRCULATION

OPTIMEX REF.

API.685 REF.

LIQUID IN THE MOTOR

n1 - optimex - pompe rotor noye iso15783 api685

Injection in the motor from the hydraulic casing (at the impeller periphery), circulation through the gap, and return to the pump suction via the hollow shaft.

N1Designation 1-SPumped liquid
n2 - optimex - pompe rotor noye iso15783 api685

Injection in the motor from the hydraulic casing (at the impeller periphery), circulation through the gap, and return to the pump casing, in between two impellers, via the hollow shaft.

N2Pumped liquid
s1 - optimex - pompe rotor noye iso15783 api685Injection in the motor from the hydraulic casing (at the impeller periphery), passage through the hollow shaft, overpressure by an auxiliary impeller, circulation through the gap and return in the hydraulic casing at the impeller periphery.S1Designation 1-SDPumped liquid
s5 - optimex - pompe rotor noye iso15783 api685

Injection in the motor via an external pipe from the discharge nozzle, overpressure by an auxiliary impeller, passage through the gap and return in the hydraulic casing in high pressure zone at the impeller periphery.

S5Pumped liquid
s3 - optimex - pompe rotor noye iso15783 api685

Injection in the motor from the discharge nozzle, overpressure by a large auxiliary impeller, passage through the gap and return to the discharge nozzle via an external pipe.

S3Pumped liquid
r1 - optimex - pompe rotor noye iso15783 api685

Pumped liquid and motor liquid are identical and they slightly communicate in order to establish an equipressure between the 2 areas (high and low temperature). On the motor side the liquid circulates in an external heat exchanger, flow is established by an auxiliary impeller. A thermal barrier is built between the hydraulic casing and the motor (air or water).

R1Designation 23-SPumped liquid
f1 - optimex - pompe rotor noye iso15783 api685

Injection in the motor from the discharge nozzle through a self-cleaning tangential filter, passage through the gap and return to the pump suction via the hollow shaft.

F1Pumped filtered liquid
f5 - optimex - pompe rotor noye iso15783 api685

Injection in the motor from the discharge nozzle through a self-cleaning tangential filter, overpressure by a large auxiliary impeller, passage through the gap and return in the hydraulic casing in high pressure zone at the impeller periphery.

F5Pumped filtered liquid
f6 - optimex - pompe rotor noye iso15783 api685

The liquid in the motor and the pumped liquid are compatible and communicate just slightly. A liquid circulates in the motor in a loop on an exchanger (flow is created by an auxiliary internal impeller to the motor). In order to avoid a pollution of the liquid in the motor, we inject a very low flow in the motor circuit from an external source (leak in the pump casing). Injection flow and pressure are determined by OPTIMEX.

F4Designation 53-SExternal liquid
sr6 - optimex - pompe rotor noye iso15783 api685

A part of the liquid called « process flow » is discharged through a double casing around the motor, in order to evacuate the calories externally, and to complete the cooling of the internal circulation. A second part of the liquid is injected in the motor from the hydraulic casing (at the impeller periphery), then circulates through the gap, and is re-injected to the process flow at the front support bearing.

SR6Pumped liquid