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Lifting Gear
Published in David House, Seamanship Techniques, 2019
The advantages of this type of rig are that cargo-handling speed can be increased as the derrick can engage in luffing and slewing operations at the same time while under full load. It has also been shown to be a very stable rig in operation, being controlled by a single operator using a joystick lever control similar to the Hallen derrick.
Construction of Steel Railway Bridges
Published in John F. Unsworth, Design and Construction of Modern Steel Railway Bridges, 2017
Erection engineering for derricks and mobile cranes is similar. Strength and stability considerations govern, and for derricks, specialized engineering design† is usually required. Mobile crane strength and stability design is by the crane manufacturer and is summarized in crane working range and lifting capacity charts.‡
The oil and gas industry
Published in Urban Kjellén, Eirik Albrechtsen, Prevention of Accidents and Unwanted Occurrences, 2017
Urban Kjellén, Eirik Albrechtsen
Example: Manual tasks in the derrick are a concern, especially those carried out outside work platforms. Here, a riding belt connected to a special winch has to be used. This operation is dangerous due to the risk of getting caught in or between pieces of equipment in the derrick. The JSA team lists all maintenance tasks in the derrick and reviews each task with a focus on the risk of getting caught by pipe-handling equipment. A primary safety measure is to eliminate the use of the riding belt. As a result of the analysis, the team decides to move lubrication points so that they are within reach from work platforms. Additional work platforms are also installed to improve access.
Servitization and performance: the moderating effect of supply chain integration
Published in Production Planning & Control, 2023
Huashan Li, Yang Yang, Prakash Singh, Hongyi Sun, Yezhuang Tian
The benefits of integration with customers were also supported by our interviews. Firm B recently developed a 4000-ton derrick crane solution together with its customer in a polyethylene construction project. The manager from Firm B confirmed the importance of collaborating with customers when developing this integrated solution: ‘We have the technology about construction equipment, but we don’t know exactly customer needs … Our customers know better than us on construction sites and the structure requirements’. Other than benefits, customers are aware of the risks and are trying to reduce the dependency on Firm B. For example, the middle-level manager in Firm B mentioned that their customers are opposed to their efforts to collect equipment operation data for better maintenance services. Customers are reluctant to develop the dependency for the fear of being monitored. Similarly, the manager from Firm A mentioned that the maintenance services (within the warranty period) are a major part of its cost structure. Overall, the interviews confirmed both the benefits (leveraging customer knowledge) and disadvantages (increasing dependency and costs) associated with customer integration.
The global offshore pipeline construction service market 2017 – Part I
Published in Ships and Offshore Structures, 2018
There are a limited number of vessels with the capacity to install a large diameter pipelines in water depth greater than 3000 ft or 1000 m (Table 4). Derrick capacity and tension can be used to classify deepwater vessels at a point in time (Figure 29), but modifications to tensioner capacities occur as project needs change (Figure 30). In recent years, there have been significant investments in deepwater S-lay vessels (e.g. Saipem's CastorOne, McDermott's DLV 2000, Allseas’ Pioneering Spirit) and there has been little or no investment in the J-lay fleet, excepting reel-lay vessels with J-lay capacity.
BSEE decommissioning cost estimates in the deepwater US Gulf of Mexico
Published in Ships and Offshore Structures, 2023
For TLPs and spars, decks are removed in one piece using a floatover technique, derrick barge or crane vessel. After the deck sections have been removed, and the mooring/tendons have been cut and removed, the hull is removed in-situ either in a single lift or in multiple lifts, depending on the lifting capacity of the crane vessel. Other removal options may also exist such as float away, and the most economical method will depend on the equipment availability, technical feasibility, dayrates, and regulatory approval.