Hydraulic jacking System is one of the
most safest mode to erect storage tank, complete work is executed on ground
level preventing risks of accidents. For decades, there has been not a
single report that proves its credibility in being the safest and most
likely method for the storage tank construction. The hydraulic jack systems
has now gained a lot of popularity, due to which the demand for a tall boom
crane has declined.
Our efficient hydraulic jacking systems
needs various scaffolding and attachments to offer comfortable access for
welding heights, but now all weldings can be done at ground level.
Welding inspectors can now perform
ultrasonic as well as several other non destructive tests on welds at ground
level, it allows easier inspection for better quality control. There is no
more climbing up to perilous positions for welding inspectors, now.
The shell plates are erected at ground
level in place of being installed at the height of about 30 feet or more, in
order to save construction time required for the alignment of plates. The
time and manpower needed for lifting the plates to the height is amputated.
Construction work remains unaffected by snow or rain, hence most of the work
is done under the protection of the tank itself.
New shell plates are developed at the
ground level in place of being hauled up to about 30 feet heights or more,
saving considerable time desired for alignment of plates. The cumulative
time needed for lifting of men and material to the heights that is
eliminated. Tank construction work stays practically unaffected from rain or
snow, hence most work is performed under the protection of the tank itself.
Example : Tank of 30 m diameter weighing about
300 tons requires 30 jacks of 12 ton each. Full cost of jacking equipment
can be recovered in 4 such tanks.
| Working Capacity
(metric tons) |
12 |
25 |
| Testing load (metric tons) |
18 |
37.5 |
| Standard arc
distance between jacks (m) |
1.80 to 3.0
|
| 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) |
1.40 |
| Min safe bearing
capacity below trestle base plate (N/mm2) |
1.45 |
| Plate thickness
range (mm) |
6 - 40 |
8 and above |
| Unitary climb
(cm/stroke) |
10 |
| Time per stroke
(minutes) |
Approx 5 |
| Working pressure
(kg/cm2) |
120 |
135 |
| Retracting system |
spring |
hydraulic |
