| Alatas Service | Workshop Repairs |
| Location | Jurong Port, Singapore |
| Vessel Type | Project Cargo |
| Crane Manufacturer | NMF |
| Crane Model | DK SL 400018 – 200030 |
| Equipment Type | Hook Block |
| Equipment Spec | 400 tons |
Alatas Singapore was called in for hook block repairs in Jurong Port. The client’s project cargo vessel is equipped with two heavy lift NMF DK SL 400018 – 200030 cranes which, in a combined operation, can lift loads of up to 800 tons. On one of the cranes, the main block developed a bearing failure on the main sheave. It was down to Alatas to complete this large job with the hook block alone weighing a massive 7700 kg.
The vessel’s owner had already engaged a Senior Engineer from one of our competitors to attempt the repairs on board, but they could not complete the repairs successfully. When the client turned to Alatas, we sent our Workshop Manager to inspect the hook block, who subsequently discussed procedures with our workshop officers and Superintendent Engineer to take over the work.
Workshop Job Scope
- Fabricate new pin for the rope fix-point, material S355J2G3 in accordance to the hook parts list.
- Fabricate new spacer ring, material BC6
- Polish the rope sheave pin and perform NDT testing on the pin
- Arrange studs, pipes, screws and other consumables.
All work was carried out in full compliance with class rules and drop compliance for hook blocks. We provided material traceability certification and detailed repair reports to the client to make this a fully certifiable repair.
Hook Block Repairs Jurong Port Gallery
NMF DK SL 400018 – 200030 Hook block was positioned on wooden blocks by the ship crew Welding the nut to the rope sheave pin and rope fix-point pin Removal of rope sheave pin by hydraulic Jack 60ton Rope sheave pin had several small surface intrusions in need of polishing Rope sheave has 2x spacer rings. One found in good condition and the other found broken. Pulling out pin from the seized rope fix-point Offload to the workshop: 1x pin to polish 1x pin to fabricate 1x spacer as a sample to fabricate new spacer ring Rope fix-point pin is badly corroded and has big pressmarks from the rope thimble Polish rope sheave pin on the lathe Remove rope sheave Removed old bearing and found damaged New rope sheave bearing arrived Installed new bearing installed onto rope sheave Cleaned all seats on the hook side plates and cleaned off the wear produce by the damaged spacer ring inside the side plate Rope sheave in position forth pin. Spacer rings installed – one on either side of the bearing Rope sheave pin secured with key plate, new screws and lock wire to conform to DROPS Lubrication newly fabricated rope fix-point pin and install pin and rope fix point to the hook block Installed 6x new machined studs with Nordlock washer and lock nut Hook block lifted up and function tested satisfactorily. The rope sheave part of the hook block is completely overhauled and conforms to DROPS
