» Advantages & Applications
» Advantages & Applications
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.
No Scaffolding Required
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.
Tank Erection Top Downwards Cuts Construction Time And Cost
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.
- Most of the manufacturing work is done at ground level that
assists in faster erection and reducing the risk of possible
- Faster erection
- Eliminates the requirement of the crane
- Cost of jacking equipment can be easily recovered after
construction of 3 to 4 storage tanks or by erecting about 1200 tons
of tankage. Jacking cost is approximately USD 50 per ton for 1200
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.
|Testing load (metric tons)
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
|Min plate height
that can be used (m)
|Min safe bearing
capacity below trestle base plate (N/mm2)
|6 - 40
|8 and above
|Time per stroke
Dimensions of some tanks that have been actually erected using
jacking equipment are:
- For shell plates of more than 2500 width (height), jacking
equipment can be supplied against specific requirements.
- Standard jacking equipment can be used for minimum shell plate
width (height) of 1400 mm. and maximum of 2500 mm.
- Jacking equipment is supplied with singe jack lifting capacities
of 8 tons 12 tons 25 tons.
- Gasholder tanks Horton spheres or spherical tanks for storage of
propane, ammonia in gaseous form.
- Storage tanks with different types of roof (floating roof, fixed
roof, suspended deck roof, column supported roof).
- Cryogenic tanks for storage of propane, ammonia at cryogenic
- Smallest diameter of tank erected using jacking equipment : 6
- Largest diameter of tank erected using jacking equipment : 92
- Maximum weight of tank erected using jacking equipment : 1900
- Dismantling of old tanks
- Repair to tank foundation
- Building of field erected storage tanks
- Repair or replacement of tank bottom plate
- Increasing tank capacity by adding shell rings or courses
- Erection of other circular structures such as reactor shields in
nuclear power stations, etc.