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Cartesian Tool Deployment Unit
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The Tooling Deployment Unit (TDU) provides significant advantages over manipulator based
intervention by providing a stable, controlled platform from which to perform such operations.
The TDU can be supplied with tooling to carry out the following generic tasks:
- Rotary and linear valve operation/actuation
- Control jumper stab-plate connections
- Fluid pressurisation and injection
It consists of a tool skid designed to fit most work-class ROVs and is usually mounted on the
aft of the vehicle – an arrangement that eliminates any significant loss of ROV
functionality. The neutrally buoyant TDU is designed to minimise ROV electrical & hydraulic
power demands and provides a centralised control interface with integral cameras.
Following deployment of the ROV to the worksite, the skid is designed to lock to a
standard ISO twin docking interface and can then perform a variety of intervention tasks on
trees, manifolds and other subsea hardware through its Cartesian deployment arrangement.
High Torque Tool rotary valve functions are controlled through a proportional torque system. This enables
surface control of the torque tool output during intervention hence providing more flexibility and eliminating the
requirement to return to surface to re-set the output for a different valve or operation.
Significant features of the Fugro’s TDU includes :
- the ability to record valve operating data for future reference
- a locus that exceeds ISO 13828-8 requirements
- support functions include four lights and up to four cameras
- dedicated support container in which the TDU may be transported and maintained.
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Specifications of Standard Tools
Tool Description
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Function |
Specification |
| High Torque Tool |
Flowline valves and jumper stabplate connection with 35mm AF square or hexagonal drive |
200 to 2000 Nm Turns count Torque read-out |
| Low Torque Tool |
Small flowline and needle valves with paddle, 35mm AF square or hexagonal drive |
25 to 250 Nm Turns count |
| Gripper Unit |
Stabplate deployment with 45 mm square handles |
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Tool Description
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Function |
Specification |
| OPTIONAL |
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| Linear override |
Use for the operation of linear actuator overrides or bi-directional diverter valves. |
Maximum force 745 kN stroke : 200 mm |
| Hot stab |
Hydraulic connection (one or two way), typically used for choke seal testing or function overrides. |
Working pressure : 690 bar |
| Fluid injection |
Typically used with the hot stab to operate water glycol, mineral oil or sea water based circuits. |
Working pressure : 345 bar optional 690 bar |
TDU Specifications:
| Maximum working depth |
Standard : 1000msw |
Deepwater : 2000msw
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Maximum working envelope |
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| X-axis (traverse) |
720 mm |
| Y-axis (vertical) |
645 mm |
| Z-axis (longitudinal) |
400 mm |
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Hydraulic requirements |
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| Pressure |
165 to 210 bar |
| Flow |
Minimum 8 litres/minute |
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Electrical requirements |
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| TDS control system |
110/115V ac at 400W |
| Support container |
3 phase 415/440V ac at 50/60Hz, 32 amp |
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Weights in Air/Water |
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| Configuration |
Weight in air |
Weight in sea water |
| Basic |
485 kg |
-45 kg |
| Jumper deployment |
500 kg |
-32 kg |
| Injection |
498 kg |
-35 kg |
| Needle valve |
495 kg |
-37 kg |
| Rotary override |
500 kg |
-33 kg |
| Linear override |
545 kg |
0 kg |
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| Conversions: |
1 Bar  |
14.50 psi |
1 kg |
2.25 lb |
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1 Nm |
0.74ft lb |
1 litre |
61 in3 |
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1 kN |
225 lb |
1 m |
39.37 in |
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Contact for Further Information
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All specifications and information are based on current data at time of publication. Fugro reserve the right without notification or obligation
to change, modify and update designs and specifications as part of our continuous improvement programme.
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