Hoe diep wil je gaan?...bosch Rexroth legt de lat op 6000 meter! Deep Water Hydraulics Challenges and Solutions

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1 Offshore conferentie 2010 Hoe diep wil je gaan?.....bosch Rexroth legt de lat op 6000 meter! Deep Water Hydraulics Challenges and Solutions Johannes Schunder / Gérard Swagten 1

2 Starting point Co-development with OEM, sponsored by German Government Development of Hydraulic Drive & Control for subsea Crawler Use of standard product portfolio with minor modifications Use of available technologies 2

3 23 Control manifolds 27 Cylinder axes 7 Hydraulic motors 3

4 Challenges Ambient pressure 1 bar per 10 m water depth -> 600bar!! Equipment located in salt water Corrosion protection is indispensable Electro hydraulics does not work in salt water Avoid water penetration at all costs Diagnosis of operating conditions 4

5 Solutions Pressure compensator Medium separation Spring force 1 bar Benefits of pressure compensation: Design pressure is only the hydraulic pressure, not the static pressure Seals are less complicated Design pressure enclosures = 1 bar No sea water ingress Hydraulic oil reservoir Δp = 1 bar 5

6 Solutions Pressure compensator Medium separation Spring force 1 bar Sufficient membrane displacement to cope with volume variations due to: Pressure variations (compressibility) Temperature variations (expansion) No air allowed inside pressure compensated rooms! Hydraulic oil reservoir Δp = 1 bar 6

7 Solutions Corrosion Protection Use of sea water protected components Stainless steel fittings and minimess Special paint: 1 st layer = Amerlock 400 Aluminum µ 2 nd layer = Amerlock 400 Color µ 7

8 Solutions Electro Hydraulics Encapsulated manifold, oil filled and pressure compensated Sea water resistant seal for cover Air has to be vented completely Specially developed on-off and proportional valves with modified solenoids, pole tubes and terminal strips Sub sea electrical connector (penetrator) 8

9 Solutions Deep Water Cylinder Welded instead of threaded design to avoid water penetration High pressure position transducer, encapsulated Extra heavy design for cylinder bottom and thread for position encoder (600 bar at bottom and thread) Sub sea electrical connector (penetrator) Special paint 9

10 Solutions Deep Water Cylinder Pressure compensation Rod seals pressure compensated Special wiper ring Main seal not in contact with sea water High-strength bolts protected with cover and seals in order to avoid water penetration 10

Solutions Diagnosis of hydraulic system All cylinders equipped either with proximity switches or position encoders Main pump fitted with swivel angle transducer Speed sensors for track drive motors

11 Solutions Diagnosis of hydraulic system All cylinders equipped either with proximity switches or position encoders Main pump fitted with swivel angle transducer Speed sensors for track drive motors Clogging indicator for pressure and return filters Particle counter in return line Special sub sea pressure sensors for all main functions Compensators equipped with level indicators Oil reservoir with water ingress and temperature sensors 11

12 Deep Sea Power Unit 12

13 Deep Sea Power Unit Test in pressure chamber Tests up to 6,000 m water depth (ambient pressure 600 bar) have been successful 13

14 Einfahren [mm] Druck PTB [Bar] Deep Water Hydraulics Challenges and Solutions Test results Control valves (flow and pressure) function properly at water Druckbegrenzung in PTB mit proportionalen Druckbegrenzungsventil pressures STD0186-1X/DBE6-2X/315G24K4M/TS up to 600 bar Bar Zylinder Einfahren mit direkten Flow 60 control valves cause 100 cylinders Bar to move slower at higher water Wegeventil 4WE6J6X/ EG24/B08 SO Bar Bar 350 pressures: 1 sec per 100 bar Bar 300 1b_0 Bar Bar 250 1b_100 Bar b_200 Bar 200 Controlled pressure reducing valves vary slightly with 1b_300 increasing Bar 150 Zeit [s] 1b_400 Bar 100 1b_500 Bar water pressures: 1 bar per 100 bar water pressure b_600 Bar Druckreduzierung in PTA 0 mit proportionalen Druckreduzierventil DREP6C-2X/25.O.N.K0 Zeit [s] Controlled pressure relief valves perform independently of applied 30 water pressures 25 0_Bar Druck PTA [Bar] 100_Bar 200_Bar 300_Bar 400_Bar 500_Bar Zeit [s] 14

Summary and prospects Deep water hydraulics is feasible but (currently) expensive Breakthrough for the profitability is not far away Raising energy costs and increasing consumption are

15 Summary and prospects Deep water hydraulics is feasible but (currently) expensive Breakthrough for the profitability is not far away Raising energy costs and increasing consumption are driving the need for sub sea solutions But there are still some open points: Electric energy supply in great water depths Maintenance of filters and pressure medium Long service life 15

16 Thank you, for your attention. 16

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