Jacks that dont need welding to tank

Listing ID #4645537

The tank is lowered down using jacks, to sit on newly erected shell ring leaving root gap as required.  To do this, the jacks are lowered down by about 70 mm.  At this time the lifting hooks will not lower down along with jacks, since their downward movement is obstructed by the new shell ring.  Now one by one, using a crow bar, the shell plate (which is held by the lifting hook) is wedged towards the front (towards inside of the tank) so as to free the lifting hook and allowing the hook to drop onto the jack.