Four STAHL 70/30 t Overhead Cranes with Tandem Mode for a Combined Cycle Power Plant, Ratchaburi
ALLA installed four STAHL 70/30 t overhead cranes in the two Turbine Halls of a combined cycle power plant in Ratchaburi, with tandem mode for 120 t turbine lifts.
Project Specifications
| Brand | STAHL |
|---|---|
| Crane type | Double girder overhead crane |
| Capacity | 70/30 t per crane |
| Quantity | 4 cranes (2 in each of 2 Turbine Halls) |
| Operating modes | Individual and tandem (2 cranes synchronized) |
| Heaviest lifts | GT rotor 120 t, generator rotor 98.3 t, ST LP rotor 84 t, LO unit 70 t |
| Tandem precision | 1 inching step = 1 mm; height difference between cranes max. 2 mm/m |
| Project period | Unit 1 Oct – Nov 2022; Unit 2 Feb – Mar 2023 |
Project Highlights
- Tandem mode lets two 70/30 t cranes lift turbine parts of up to 120 t together
- Crane settings adjusted on a tablet, protected by user access codes
- Avoided a single crane of about 135 t plus a lifting beam, at a much higher cost
- Lower crane height let the customer reduce the building height and construction cost
What did the customer need?
The EPC contractors building a combined cycle power plant in Ratchaburi needed two overhead cranes in each of its two Turbine Halls, able to work individually or in tandem to install large, heavy turbine parts:
- GT rotor 120 t, generator rotor 98.3 t, ST LP rotor 84 t and LO unit 70 t
- Tandem lifting with millimetre precision: 1 inching step = 1 mm
- Height difference between the two cranes during a tandem lift of no more than 2 mm/m
How did ALLA deliver it?
ALLA supplied STAHL cranes and programmed their operation to the precision the customer required. Settings can be adjusted on a tablet, and only users with an access code can change them. Lifting in tandem with two cranes saved the customer the much higher cost of a single crane of about 135 t with a lifting beam, and allowed the building height to be reduced.
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