ZOGPI Company recommends using PDM1 machine in order to neutralize the magnetic field created by Pigging.

This device measures the magnetic field at the welding location and creates an equal and opposite magnetic field in order to neutralize the residual magnetic field.
The USNT-1M arrangement is added by magnetic amplifiers , AC/DC power supply converter HLG-240H36A and additional clamping magnets. Magnetic amplifiers render possible increasing of the value of the compensated residual magnetization up to 3000 G and more. The amplifiers may be used both in operating area of the device or remote from it , therefore the efficiency of USNT-1M is highly improved and the possibilities of application are expanded. power supplu converter is intended for connecting to 220 V electric power and the clamping magnets are used for comfortable welding in overhead position.