Manufactured now by ASAMS, the SYSTEM 3 MPI is a modular design employing a sophisticated power control surface unit and an integrated, pressure compensated, subsea unit with built-in ink management systems.
A heavy-duty isolating transformer supplies power to the surface unit, which is connected to the subsea unit via a single 200 metre umbilical, which is deployed from a strong hand operated spooling frame.
The Surface Unit is housed in a rugged stainless steel case with removable front cover. Its key features include:
■ An input-output current ammeter
■ Earth Leakage detectors and trips
■ A magnetising loop operation indicator
■ A demagnetising facility
■ Remote control of the magnetising current
The Subsea Unit has AC and DC outlets for three magnetising techniques – Electromagnetic Yoke, Magnetising Coil and Prods. The Magnetising Coil and Prods can be AC or DC powered, whilst the Yoke is DC powered and allows bolt-on articulated sections to be fitted to enable inspection of irregular/awkward shaped work pieces. These 3 options allow the user to select the best tool for a particular structure or pipeline configuration, increasing operational flexibility and speeding up MPI diving programmers.