TTS-4/450 Series Tensioner

4-track system

The MDL TTS-4/450 Series Tensioner is a 162Te - 4 track system for the installation or recovery of flexibles, cables, umbilicals, and steel pipe products.

The tracks are fitted with 'V' shaped pads and operate by gripping the product between opposing track carriages with failsafe hydraulic cylinders.


7.6m x 4.6m x 4.9m (LxBxH)

Weight (assembled)


Operational mode
2 or 4 track mode

Track contact length

Nominal squeeze
1800Te (4 x 450Te)

Nominal squeeze/track

Nominal pull force (idler end, 4-track mode)
162Te at 0.09 CoF
126Te at 0.07 CoF

Product speed (162Te pull)
0 - 500m/hr (at 60Hz)

Product speed (126Te pull)
0 - 640m/hr (at 60Hz)

Tension control
10 - 100% - provided digitally

Product Capacity

Product range
50 - 600mm

Maximum track opening
800mm (minimum)

Ancillary Equipment

Electro-hydraulic powerpack
6.0m x 2.8m x 2.8m (LxBxH)
Weight - 20Te

Control van
3.0m x 2.3m x 2.6m (LxBxH)
Weight - 4.0Te

Spares container
3.0m x 2.2m x 2.6m (LxBxH)
Weight - 6.0Te

Spreader beam

Lifting Equipment

1 x lifting rigging set for the tensioner
1 x lifting rigging set for all ancillary equipment

Hose & Cable Package

25m set from powerpack to tensioner unit
25m power cable from powerpack to contol van
25m power cable from powerpack to vessel

Assumed Conditions

Up to 90%

Marine/high salinity

Power Requirements

Supply 1 (main system)
3 phase, 440V, 60Hz, 630amp supply at full load

Design Appraisal

Design appraised in accordance with DNV standards.

Additional Information

The unit is designed for mounting horizontally on a deck, inclined on a ramp or hung off vertically.The tracks are driven by hydraulic motor/brake/gearbox drive assemblies to deploy or retrieve product.All four track carriages are mounted on the main circular structure which is attached to either the base frame, or a vertical lay system through load cell pins which provide accurate product load information.

In the horizontal or inclined lay mode one track opens to load/unload the product. In the vertical lay mode two tracks open to load/unload the product.

The unit is supplied with a dedicated dual electro-hydraulic powerpack and quick connect/disconnect hoses. It operates in 2 or 4 track mode.

Unit is road transportable or can be shipped by container in component form. Facility for data logging can be supplied.

Note: For purchasing the unit can be offered with electric drives.

MDL 162 Tensioners closed MDL 162 Tensioners open