Thursday 8 January 09 - 07:05
 

Diving & Underwater Services

Mobile ROV Repair Saves the Day

As the ROV market is expanding rapidly, many ROV operators are forced to focus mainly on their direct operational performance, leaving them struggling with the maintenance and support for their valuable systems. Based at Zierikzee in the Netherlands, Seatec Underwater Systems B.V. has responded to these circumstances by expanding it’s activities with ROV repair, maintenance, support and fleet management services.

Seatec engineers prepare an ROV for mobilisation.
Seatec engineers prepare an ROV for mobilisation.

Seatec engineers were recently requested to perform service onboard a service vessel. A Seaeye Panther with dedicated Launch and Recovery System was dead in the water and needed to be 'reanimated' fast to continue the job. Due to a bad weather situation, there was a 48 hour window to conduct the necessary repairs and tests.

A repair crew was mobilized within six hours to the Scandinavian region, taking the necessary spare items from in house stock. Upon arrival on board the vessel a conversation with the ROV pilot crew ascertained that an unidentified crash during the last survey action with the ROV resulted in leaving it dead in the water. The crew had managed to recover the ROV via its tether mechanism.

Following the conversation, an inspection of the ROV was conducted. Severe damage to the side panels was found and re-termination of both tether and main lift umbilical were deemed necessary. The Seatec service crew together with the ROV pilot crew started simultaneously with the various activities.

As work progressed, the search for an approved third party load test witness started.

Following the completed electric re-terminations, a function test was conducted to make sure that all electric connections, controls and sensors functioned properly.

A malfunction of the obstacle gyro system was then found. Further investigation showed this to be caused by a topside control unit error. Control boards inside the e-pods were also checked and re-positioned.

Mechanical re-termination, including casting the load bearing structure, could now be performed and the system was laid to rest to enable curing of the casting. A series of load tests were carried out in order to ensure correct mechanical re-termination. These were witnessed by the approved third party load test witness and the load test certificate was issued.

During a wet test of the complete ROV spread some optimizations were made to the camera and light system and the signal ready for deployment was given. The total time frame for the entire action was less than 40 hours, ensuring minimal lost time.

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