Bell Hydromatics Working Principle of Bell Hydromatics hydraulic machine
Working Principle of Bell Hydromatics punchline hydraulic machine system
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Working Principle of Air Hydraulic Jack

Basically jack climb up on the jack rod (Part of the lifting trestle) with the desired pressure, to lift up the load. Its action is same as a monkey that climbs a trunk tree; i.e, first it holds up on to the trunk with its legs and lunges upwards, then it holds on to the trunk with its hands and lifts its legs up. At any time, either its hands or legs have a grip on the trunk, which prevents it from falling down.

In the same manner, air hydraulic jack, air hydraulic bottle jack and jack is provided with two pairs of jaws, a lower pair of jaws and an upper pair of jaws for an excellent grip. During lifting, both the pairs are “locked”. In this position the jack can only move upwards. At the time of lifting, the lower pair of jaws grip the trestle rod while the jack lifts up. After completing the full stroke, the upper pair of jaws grip the trestle rod, however, the base of the jack moves upward. During the process of lowering, any one of the pairs is always locked.

Description of Principle of The Erection System

The following description provides a brief outline about the working procedure of air hydraulic jack and air hydraulic bottle jack. However, improvements can be certainly done if required. (Refer the drawing below to develop better understanding).

The tank bottom-plates are placed on the prepared foundation and welded together.
  • Spacers cum guide beams of maximum 400 mm height are tack welded to the tank bottom along the periphery. The plates of the first shell ring (in fact the top ring of the tank) are positioned and welded together.
  • The lifting equipment is assembled by following a standard method. The plates of the second shell ring (next to top ring) are positioned outside the first one.
  • The beams or lattice work of the roof are assembled and finally joined to the upper rim of the shell ring. Inner sheets of the roof are placed and welded together.
  • The completed part of the tank (the roof and top shell ring) is lifted hydraulically to a height, at which the plates of the second shell ring can be moved into place and the roof sheeting can be completed, except for about 2 or 3 roof plates which shall not be fixed until completion of the tank for air to pass through
  • The entire tank is lowered down to the bottom plates and welded to this. The lifting equipment is dismantled.
  • The plates of the third shell ring are placed outside the second shell ring.
  • The completed part of the tank (the roof and the two uppermost shell rings) is lifted.
  • The above cycle of operations is repeated until the last (bottom) shell ring is finished.
  • The plates of the second shell ring are located exactly and welded together to the lower edge of the first shell ring.

Determining The Number of Jacks To Be Used For Any Tank :

Number of trestles required for the tank depends on various factors such as:
  • The maximum weight of the tank. The vertical load is max 8, 12 or 25 ton per trestle, depending upon the type of jacking equipment selected.
  • The normal maximum distance between the trestles is 3 mtrs.
  • The maximum distance between the lifting points in the shell with regard to the stability of shell.
  • The maximum wind load on the trestles.

Working Principle of Bell Hydromatics Working Principle of Bell Hydromatics Working Principle of Bell Hydromatics


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