Adding second-source machinery to a production line
Treat the replacement as an integration project: compare interfaces, obtain incorporation documents, assess risks across the affected assembly and decide whether renewed conformity assessment is needed. Release the line only after documented safety checks and corrective work. Factory evidence can be coordinated by Cambridge China Bridge.
Define what the supplier delivers and who integrates it
For partly completed machinery, HSE specifies assembly instructions and a Declaration of Incorporation rather than a Declaration of Conformity. Ask for documents identifying the actual supplied configuration, the incorporation conditions and the work left to the integrator. Use the machinery sourcing guide for the broader purchasing brief.
Name the person leading the integration assessment before ordering. HSE says installers constructing machinery from parts not supplied and intended as a complete product, and users constructing machinery for their own use, become the manufacturer. Agree responsibility for design, controls, documentation and release. Keep factory qualification separate from line acceptance; the second supplier guide covers supplier approval.
Record differences against the installed module
Build a comparison register using the installed drawings and the candidate's actual design. Compare mounting points, transfer heights, movement envelopes, loads, utilities, electrical connections, control signals and software versions. For each difference, record the affected equipment, proposed adaptation, responsible engineer and acceptance evidence. Use the product specification guide to turn those findings into the order specification.
Compare safety behaviour as well as physical fit: stopping behaviour, emergency-stop coverage, guard interlocks, reset conditions, restart after power loss and isolation of stored energy. Ask how neighbouring equipment responds when the replacement faults or stops. Record a supplier's claim of interchangeability as something to verify, rather than closing the register on that assurance.
Assess the affected assembly
HSE requires an assembly-level safety assessment where substitution substantially affects the whole assembly's operation or safety. The assembly may need renewed compliance; unaffected individual machines need no reassessment. Record the assessment boundary and explain why equipment outside it is unaffected.
Trace hazards through material transfers, shared controls and access between machines. Include operation, setting, cleaning, jam clearance and maintenance. Check whether a stopped module can still receive material or movement from its neighbours. Link each hazard to a protective measure and a verification result; do not stop the assessment at the replacement's guarding.
Test the installed configuration
Agree factory tests that expose integration differences before shipment, using representative materials and simulated neighbouring signals where useful. The inspection guide covers inspection planning. Keep factory results attached to the tested configuration, then repeat the relevant checks after installation with the actual neighbouring equipment.
Have the integration team define safe test methods and expected results for interlocks, emergency stops, fault responses, reset, restart and isolation. Record the installed hardware and software, observations, defects, corrective work and retest results. Separate a throughput trial from safety verification, and record any function that the factory setup could not test.
Working out your own order? Send us the product on WhatsApp and we reply the same working day: WhatsApp us
Prepare the release evidence
HSE says equipment requiring inspection should not be used unless you know that inspection has taken place; inspection results should be recorded. Prepare a release pack containing the incorporation documents, difference register, assembly risk assessment, applicable conformity evidence, installed drawings, safety test results and inspection record. Treat this pack as a practical way to organise evidence, rather than a universal statutory form.
Before authorising routine production, ask the responsible engineering and workplace-safety owners to confirm that safety defects are closed, instructions match the installed line and operators and maintainers understand the changes. Record who authorised release and what configuration was released. Cambridge China Bridge can coordinate supplier documents and factory checks through its staff in China; the buyer retains its engineering and compliance decisions.
Frequently asked questions
Does a Declaration of Incorporation let us run the line?
It documents the partly completed machinery, rather than proving the integrated line is ready. Complete the integration assessment, applicable conformity work and safety verification before routine production.
Must every machine on the line be reassessed?
HSE says unaffected individual machines need no reassessment when an assembly is modified. Define and justify the boundary by tracing shared controls, material transfers and safety effects.
Is a factory acceptance test enough?
Use it to find differences before shipment. Verify the installed interfaces and safety behaviour on the actual line, and retain the applicable inspection evidence before release.
What should we request from the second supplier?
Request configuration-specific incorporation documents, interface drawings, control and safety descriptions, software details, test results and a clear list of work left to the integrator.