Through Frame Lift Capacity
The UTROV is vertically tethered so the weight of the components within or attached to it have limited effect on the performance of the tool. The UTROV has a through frame lift capacity of 60t (this capacity is limited to 15t by the umbilical winch), and the full force of the winch can be applied through the frame of the UTROV to the tooling.
A common misconception particularly in subsea demolition operations is to use a large winch to apply forces to break up subsea structures; this is a very inefficient use of power. The 80l hydraulic oil volume on the UTROV enables very large hydraulic cylinders to be operated and apply huge forces where required, the shear grab is an example of this where a 300t cutting force can be applied. Larger tools can easily be used to get apply forces in excess of 1000t subsea.The pump units on the UTROV can be adjusted to suit the operation at hand. The Mass Flow Excavator requires a high flow of oil at a low pressure; prior to operating this tool the settings of the pump are changed to produce 390l/min @ 100bar.
Increased Efficiency & Reduced Power Requirement
The UTROV is designed to work in shallow and deep water (1500m) for this reason a high voltage system (3300v) is used to reduce the resistance induced losses over the length of umbilical. 2 x 3300v electric motors drive variable displacement load sensing pumps to give hydraulic power to the interchangeable tools.
The hydraulic power is provided at source rather than at surface as is common in most MFE operations, this is far more efficient and therefore requires far less power. Another significant advantage is that if a hose was to rupture the volume of oil that could escape using the UTROV is 80l the alternate method would exceed 1500l.
Reduced Cycle Time
For operations in deep water, a large proportion of vessel time can be spent waiting for equipment to be deployed to, or recovered from depth, the UTROV is not naturally buoyant therefore it will sink as fast as the winch can deploy it.
In addition to this the UTROV is constantly connected to the tool so there is no set up time whilst the ROV has to connect to the tool. Both these factors minimise the time required a vessel to complete the same operations therefore increasing the competitiveness or profitability of the user.
Reduced Footprint & Weight
The foot print of the UTROV system is comparatively smaller than the market equivalent. All required functions are combined in a single umbilical (lift, power & comms) as per an ROV but an additional lifting member is not required for the tooling.
When using the MFE no additional hose reelers or large HPUs are required allowing the system to be installed on a smaller vessel, providing further potential cost savings for the end user.