HYDRAULIC JACKING FOR FIT UP
HYDRAULIC JACKING FOR FIT UP
(OP)
For welding shell to skirt assembly of a 30 mm thick, 5000mm Dia CS vessel, we used jacking to close a 50 mm gap for alignment and fit up as per UG 31.
Is this a common practice and is it anyway affect the structural integrity of the vessel.
Is this a common practice and is it anyway affect the structural integrity of the vessel.





RE: HYDRAULIC JACKING FOR FIT UP
In the tank world, I've not seen hydraulic jacks used for fit-up, but have seen equivalent methods that induce a good bit of force into the parts to be fitted.
RE: HYDRAULIC JACKING FOR FIT UP
RE: HYDRAULIC JACKING FOR FIT UP
The metal doesn't know where the force is coming from. We use mechanical and hydraulic jacks to round out SS vessels. 200Ton hydraulic jacks to reshape 60" SS flanges with the AI cheering us on. We expand all types of tubes hydraulically.
A couple of things we have accomplished in forming and reforming some PVs' is I preferred using the remote capability of the hydraulic approach due keeping personnel away from all the stored energy.
Several reasons that you don't see that much hydraulic forming equipment is that it is more expensive and can get messy if not careful.
RE: HYDRAULIC JACKING FOR FIT UP
RE: HYDRAULIC JACKING FOR FIT UP
genb
RE: HYDRAULIC JACKING FOR FIT UP
,fixtures and swearing.
They all work----depends what you are doing and what you start with.
If you have a good fitter you will get what you need with minimum damage.
RE: HYDRAULIC JACKING FOR FIT UP