FEATURE SPONSOR


UNEXPLODED ORDNANCE


a maximum altitude of 1.0 – 1.2m, any anomaly above 30 nT/ft was considered to be potential UXO that could pose a threat to the campaign. During the survey 432 UXO items and 696 UXO-related items were detected. All of the UXO that posed any threat to the installation was successfully cleared and the pipelines were later safely installed.


“MMT surveyed the complete route (except Russian waters) for the Nord Stream pipelines in the Baltic Sea for the first two pipes. The experience gained through this has been used in many projects since,” says MMT Founder Ola Oskarsson.


PROGRESS


Almost 10 years later in 2016, the boundaries for state of art UXO surveys were once again pushed forward. Nord Stream 2, a project to build two more pipelines in the Baltic, subcontracted MMT to perform UXO surveys of the pipeline corridor. A completely new system was developed by MMT, increasing the frame width to 8.5m and utilising 24 three-axial magnetometers to form a gradiometer used to survey a wider corridor.


Image 1 (below): Blue line shows data from GMA-1000 model T compared to another well-known system. With a high sample rate and very low noise levels the detection capacity is very high. The zone of detection is spherical and the swath sampled by the sensor in a single pass is affected by the altitude of the sensor above the seabed.


Image 2 (left): The new GMA1000 Model T system fitted to a work-class ROV. With this new system the noise levels are generally below 2-3 nT/ft, enabling an increased detection threshold at higher survey altitudes. The sampling rate of 100 Hz allows high speed surveys while still detecting smaller potential UXO targets.


The possibility to survey at higher altitudes gives the opportunity to survey more quickly while maintaining safety. MMT has used the GMA-1000 sensors on WROVs in over 10,000 survey kilometres in the Baltic Sea and Black Sea.


CONTINUED INNOVATION


The innovation continues at pace with MMT Sweden, together with Reach


MMT Sweden


Subsea, developing the world’s fastest ROV, the Surveyor Interceptor survey ROV, equipped with state-of-the-art sensors to deliver survey operations at higher speeds and with industry leading data resolution. Combining different types of surveys in one go is the future, leading to more effective campaigns and lower cost. One of the goals is to perform wide UXO surveys at higher speed. SIT trials are conducted Q1 2018.


MMT strives to continuously develop tailored systems to survey wider corridors at higher speeds. They provide their customers with better solutions and a safer installation at a reasonable cost.


WEBSITE


VIMEO


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