ELEKTON-ABC (Anti-Backspin Coupling)

FUNCTIONS:

• blocks reverse rotation of the ESP shaft in case of electric motor stoppage and check valve;
• provides torque transfer from the electric motor both in the forward and reverse directions;
• when used with an ESP unit with a permanent magnet motor, helps preventing the motor from generating current during backspinning and, accordingly, ensures the protection of the VSD and the staff;
• The use of the antibackspin coupling enables starting the pump fluid drainage from the tubing in case of the check valve or its absence;
• The use of anti backspin coupling in the ESP string with no check valve enables direct through-tubing flushing of the pump, and reduces the well killing time.

BASIC SPECIFICATIONS

1.	Shaft rotation speed, RPM, max	6000
2.	Maximum transmitted power, kWt	125
3.	Filling oil volume	1
4.	Weight, kg, max	12,5
3.	Overall dimensions, mm, max	Ø103, length 377
3.	Allowed rotation direction	Direct when the ESP motor is switched off Direct and reverse rotation with operating ESP motor

Installation and connection dimensions

The anti backspin consists of a housing holding input and output shaft, and a disk self-stopping gear. The housing has flanges for the coupling installation between the ESP motor and the protector. The shafts are mounted on the bearing assemblies. A self-stopping gear is located between the shafts. Some elements of this gear interact with the input shaft and others – with the output shaft. When the input shaft rotates in both forward and reverse directions, the self-stopping gear does not prevent the transfer of rotation to the output shaft. When the output shaft rotates in the forward direction, the ESP operates in the normal mode, and in case of reverse rotation (backspin) it is immediately retarded and stopped. The deceleration parameters (gripping time, braking force) remain unchanged over the entire service life. The service life is determined by the durability of the bearing assemblies.