A shipping company improves the performance of its hydraulic system
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The Penn Ar Bed Shipping Company operates ferries carrying passengers to 3 islands in Brittany (Ushant, Molene and Sein). Their hydraulic systems must be in perfect working order to guarantee their ferries are not stopped for long periods of time.
For this case study, our mission consisted in:
- solving problems with the stabilisers
- finding a solution to problems due to the disintegration of filter elements
- obtain the Cleanliness Class ISO 4406 = 17/15/12
IDENTIFICATION OF PROBLEMS
THEIR PROBLEMS:
The stabilisers failed to operate correctly since the response time was poor
Disintegration of Pressure Filters
Contamination of the hydraulic system due to pressure filters
THEIR HYDRAULIC SYSTEM:
Oil 46 cst Shell Tellus T46
System at 250-280 bar
Pump outlet: 295 L/min
Hydraulic steering gear: Quantum
PVG Danfoss: Recommended Cleanliness Level: ISO18/16/13
4 Pressure filters
PALL: UH319CG32 13ZG9X106
Filter element: UE319 AS13Z
4 Return filters
PALL: UR319F40 13ZGN BBB
Filter element: UE319 AS13Z

WHAT WE CONCLUDED:
The filter element of the pressure filter cannot withstand a ∆P >10 bar
The disintegration of filters cause contamination throughout the hydraulic system, and particularly at the stabilisers which causes malfunctions.
The ISO code measurement gives values equal to 23/20/16. Therefore, there is 32 times more pollution than the PVG Hydraulic Distributors can accept.
THE ID SYSTEM FLUID SOLUTION

Replace the PALL UH 319 filters with HY-PRO PFH840 filters

OUR PROPOSAL WAS:
1 – Solve the problem of filter elements exploding by installing HY-PRO PFH pressure filters with a ∆P on the filter element = 210 bar
2 – On the return filters, install adaptable HY-PRO HP319filter elements, 3 µm β>1,000 for restarting (Trap the contamination in the systems)
3 – Put HY-PRO filter elements, 12 µm β>1,000, in place after restarting
4 – Use the CPH2O-PO particle counter to control and validate the operation when the hydraulic system is completely started
RESULTS
AFTER RESTARTING, DURING OPERATION
ISO Code = 17 /15 /10
Pressure filter elements no longer disintegrate
No more hydraulic operation problems with the stabilisers and steering gear.

