DECK EQUIPMENT
Rolls-Royce wins crane service contract R
olls-Royce has secured a major contract from MACS Maritime Carrier completely to overhaul the five cranes onboard each of two multipurpose containerships – without the need for docking the vessels. Both the 1978-built vessels, Algoa Bay and Stellenbosch, acquired by the German owner about a year ago,
had their original Fukushima cranes, but after closer inspection and a detailed condition assessment by Rolls- Royce it was proposed that the cranes should be completely overhauled to give them an extra ten or 15 years of operation. ‘We discussed how the ten cranes could be overhauled without having the vessels alongside for long periods at
a time and agreed it best to remove the 43t, 8.4m high cranes one-by one,’ said Rolls-Royce after-sales manager Walter Eller, based in Hamburg. ‘After landing the crane at our workshop, work begins immediately. We get all the hydraulic equipment out,
overhaul the components or exchange them for new and then do all the necessary repair work on the mechanical equipment, brakes and couplings and other components. The work is intricate because we’re working on a variety of systems; we’re overhauling or upgrading hydraulic drives, pumps, motors, the electrical control system and we also do some repair work to the steel structure and the crane jib,’ Mr Eller explained. ‘After four weeks the crane body is empty, we take everything apart. But four weeks later, we deliver the overhauled crane back to the ship and remove the next one. It’s as good as new.’ Following full scale testing of the hydraulic and electrical components, the crane is returned to the ship, where
it is mounted in pairs on a common platform; this, so that the Rolls-Royce team can set the cranes up for twin- mode operation. Each crane has a lift capacity of 22.5t but in twin mode it will be possible to lift 44t, with both cranes operated by a single driver. Rolls-Royce has already completed the overhaul work on two cranes, one from each ship. The entire contract should be complete by April next year.
way had to be found to transfer an enormous amount of energy and signals to the rotating parts. Direct current is generated in the fixed crane pedestal and transferred through four 1200A slip
rings to the main winch frame inside the pedestal. All large winches for main, auxiliary and topping hoist are on this enormous winch frame that rotates along with the slewing movement of the boom. The frequency converters controlling
Cranes_Naval Arch 177x124 30/1/07 2:46 pm Page 1
The boom on the crane on Sapura 3000 can rotate full circle, unlike other mast cranes built until now.
Call +47 55 94 74 00
TTS marine cranes cargo cranes | heavy lift cranes | hose handling cranes | knuckle or telescopic boom cranes service cranes | rescue boat davits | winch bollards After-sales service and support
THE NAVAL ARCHITECT FEBRUARY 2007
55
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105