| Dorman Long Technology | ||
| Jacking tower system, 2500 tonne capacity, China |
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In 2002 we were engaged to carry out the conceptual and detailed design of a new modular jacking tower system for the Chinese refinery construction market, to be owned and operated by No 4 Construction Company of Sinopec. The system uses strand jacks for vessel lifting and guying of the tower and was designed with many new features, including: |
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| • | Low level assembly using mobile crane and self-erect/dismantle to full height of over 100m | |||
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Tower luffing capability under full load | |||
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Integral base skidding system | |||
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Reduced sensitivity to ground settlement/rotation under load | |||
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All components readily transportable by road between sites | |||
| The new system carried out its first lift in early 2003. It was used to erect a 92m long, 763 tonne vessel in a chemical plant on the outskirts of Nanjing, China. (see below). |
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| First lift | Tower system during self-erection |
Tower system operating sequence: |
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| 1. Tower self erected to full height and vessel delivered over foundations |
2. Vessel lifted using strand jacks |
3. Vessel rotated and set down on foundations |
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| 4. Tower skidded clear of vessel |
5. Tower self-dismantles to low level |
6. Tower ready for removal by light mobile crane |