Project · Shop fabrication and welding

Tank and vessel fabrication

We weld the nozzles into the courses before they go on the stack, weld out the seams under a crane, and cut and fit the bottoms on the shop floor.

Welder working under a tank shell held up and secured on timber packing, with bottom plates laid out on the shop floor — Shell held up on packing, work going on underneath.

Scope

Shop fabrication and welding

Setting

Fabrication shop, under a crane

Plates

6 photographs

How it was built

One plate to a stage. Press a plate to open it full size.

Stage 01 / 05

Nozzles and manways go into the shell courses before they go on the stack, while a course can still be worked from both sides. The welder works downhand and can get at the back of the joint. By the time a course goes on the stack the nozzles are already in it.

Vessel shell course being lowered onto the course below by overhead crane, with the nozzles already welded in — The nozzles go in before the course goes on the stack.

Stage 02 / 05

The first course goes on timber packing. The next comes down on it under the crane, landed and held while the seam is tacked, and then welded out.

Assembled vessel standing on blocks, with nozzles, a side manway and a drawing taped to the shell — Vessel closed up.

Stage 03 / 05

The large tanks go together the other way up. The shell is held up on packing and the next course goes on underneath it, with a row of temporary clips round the inside holding it while the seams are welded out.

Those clips and the lifting lugs come off when the shell is done, and the places where they were welded are dressed back level with the plate.

Inside a tank shell, a long pipe on trestles and temporary clips welded round the courses above the bottom plates — Inside the shell, with the temporary clips round the courses.

Stage 04 / 05

Lifting is done on the overhead crane, using slings and a spreader beam. Bottom plates are cut and fitted on the shop floor.

Tank shell lifted on slings from lugs welded to the top course — Lifted on slings from welded lugs.

Stage 05 / 05

In the shop the welding is done under cover and under a crane.

Fabrication hall with tank shells, a vessel on packing, and a spreader beam with slings on the floor — The shop floor.

Disciplines on this job

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