Jack Models
The time for lifting tank upto 2.5 meters height is as follows:
Using double action jacks - 40 minutes
Using single action jacks - 3-4 hours
Double Acting Jacks work 5 times faster than Single Acting Jacks
Selecting the Right Jack Configuration
The optimum tank jack is determined not only by lifting capacity, but by many other parameters. Bygging therefore offers its hydraulic climbing jacks in a range of capacities and configurations to suit different tank dimensions, shell-course heights, plate thicknesses and welding sequences.
For projects where erection speed is important, double-acting hydraulic jacks significantly reduce lifting time compared with conventional single-acting jacks. Both upward movement and piston retraction are hydraulically controlled, enabling the lifting cycle to be completed considerably faster.
In addition to lifting capacity, Bygging jack models can be configured according to:
- Maximum shell-course height
- Method of contact with the tank shell
- Requirement for a retractable trestle
- Internal automatic welding requirements
| Model / Description | 510-25D | 2510-35D | 2510-40D | 2510-50D |
| Working capacity (metric tons) | 12 | 12 | 18 | 25 |
| Testing load (metric tons) | 18 | 18 | 27 | 37.5 |
| Standard arc distance between jacks (m) | 2 to 3.5 | |||
| Max plate height for which jacking equipment can be supplied (m) | 2.5 or 3.0 or more | |||
| Min plate height that can be used (m) | 0.80 | |||
| Min safe bearing capacity below trestle base plate (N/mm2) | 1.45 | |||
| Plate thickness range (mm) | 5 and above | 6 and above | ||
| Unitary climb (cm/stroke) | 10 | |||
| Time per stroke (minutes) | Approx 5 | 1 to 1.55 | ||
| Working pressure (kg/cm2) | 120 | 142 | 135 | |
| Piston retracting system | Spring | hydraulic | ||
| Trestle retractable system to al low internal welds using automatic welding machine | No | No | No | No |
