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Underwater Technology Services (s) Pte Ltd.

35 Pioneer Road, Unit J8Singapore 628503Telephone: +65 6 861 8006Facsimile : +65 6 863 2865Enquiries@underwatertechnologyservices.com

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20Te Tensioner

This tensioner comprises of 4 track units each hydraulically driven through an epi-cyclic track gearbox and bent axial piston hydraulicmotor. Standard lubricated Berco track chains are employed on to which are bolted V profile hard wearing polyurethane track pads.

The lower track unit and one side unit is hydraulically positioned to suit the product diameter using linear encoders to ensure accu-rate position. The top track and other side track are also hydraulically positioned against the product initially at low load, then simul-taneously pressurized to the desired grip load. Hydraulic accumulators ensure the load is continuously applied providing back up inan emergency.

To allow the product to be removed from the tensioner in mid line, or where end terminations are too large to pass through the ten-sioner, the top track opens by hinging to one side. The unique method employed to do this maintains the opening track within thetensioner width thereby minimizing deck space requirements.

A dual Hydraulic Power Unit (HPU) powers the tensioner. Two electric motors are each combined with a dual pump, the main load-sensing pump being for the track drives and a piggyback load sensing pump for the grip circuit and ancillary functions. Control of thetensioner is through a PLC and HMI. The HMI is used for calibration purposes and for setting particular parameters. The PLC moni-tors the complete system from track position settings, to latch cylinder open/close, grip pressure, HPU oil levels and temperatures etc

and allows the tensioner to operate only when in the correct status.

Tensioner Specifications

Description Value

Pull Force from idler end 20 Te

Pull Force from gearbox end 15 Te

Track contact length 2.4 m

Track grip force total 335 Te

Cable grip load/m per track 35Te/m

Coefficient of Friction = 0.09

Max speed laying 1000m/hr

Max speed recovery 650m/hr

Height deck to centre line 1625 mmTrack movement per track 360 mm

Track open clearance 700mm nominal (pad design dependant)

Oil flow to tracks 400 L/min total (2 x 200L/min)

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Track motor pressure max 350 Bar

Oil flow auxiliary circuits 120L/min (2 x 60L/min)

Grip & ancillary pressure max 250 bar

HPU power 2 x 75kW, 3ph, 380V/440V 50/60Hz

Motor current running max 134A each motorMotor starting Star/Delta

Cooling water requirement 200L/min @ 7 bar

Tensioner dimensions 5.14mLx3.3mWx3.32mH - weight 25.0Te

HPU 3.3mLx2.0mWx2.13mH - weight 5.0Te

Cabin 2.2mLx2.0mWx2.5mH - weight 1.5Te

Load cells 2 x 20Te rated

Fixed tracks position 2 x taught wire encoder

Grip tracks pressure 2 x pressure transducer

Top swing track open/close Proximity sensor

Latch cylinders open/close 12 x proximity sensors integral to cylinders

Track speed & distance Encoder

Brake on/off Pressure switch

HPU low oil Float switchHPU no oil Float switch

HPU oil temperature Thermostat

HPU track oil pressure 2 x pressure gauges

HPU auxiliary pressure 2 x pressure gauges

Tensioner HPU

SPECFICATIONS

Power rating 150kW

Voltage 380 415 volts

Max full load current 2 x 130 amps

Frequency 50Hz

Main Drive Pump Flow x 2 200L/min max, 100 L/min @ max pressure

Main Drive Pump pressure Max 300 bar, min 30 bar

Auxiliary pump Flow x 2 60 L/min

Auxiliary pump pressure Max 210 bar, min 30 bar

Gross weight 5000kgWATER/OIL COOLERRequired water flow - Saltwater

220 L/min max

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STORE AND CONTROL VAN

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GA DIAGRAM

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