What actually determines whether a relocated production line runs again

A five-station tandem press line moved from Haryana to Southeast Asia — 2,150 tonnes, five months, a 320-tonne indivisible press bed and a fixed production ramp date at the destination. The engineering challenges everyone anticipated were the heavy ones: floor loading at extraction, sea transit preservation, alignment on reassembly.

The deliverable that turned out to matter most was a set of photographs and a reconstructed schematic.

The problem with fifteen years of modification

The line's control system had been modified continuously over fifteen years of production — sensors relocated, interlocks added after incidents, safety circuits upgraded, PLC logic patched by people who have since left. Documentation had not kept pace, which is entirely normal and almost universal.

Mechanical reassembly would have recovered alignment. It would not have recovered function, because nobody at the destination would have known how the line was actually wired as opposed to how it was originally designed.

What we did before disconnecting anything

• Photographed every field connection in situ before any cable was pulled
• Labelled both ends of every disconnection against a numbered register
• Traced and mapped interlock and safety circuits as built, not as drawn
• Recorded PLC configuration and I/O mapping as running
• Reconstructed a usable schematic from the survey and issued it as a project deliverable

The load-spreading problem, briefly

The 320-tonne press bed exceeded the floor loading of the only viable extraction route. Slab construction was confirmed by core sampling — it did not match the facility drawings, which is the recurring theme of this work — and a temporary steel raft was designed against measured construction to distribute the load. The bed was skidded across it to a hardstand and lifted from there.

Outcome

Zero transit damage, alignment achieved to original OEM tolerance verified by laser survey at every station, no interim storage because destination foundations were built during sea transit, and the production ramp date met.

The client's operations director has since described the control documentation as worth more than the relocation itself. We would not disagree.