How to build a production line technical file
Build an assembly-level file that defines the line, assesses interface hazards, holds constituent declarations and instructions, and records integration changes. The person constituting the assembly is responsible for its conformity as a whole. Ask for factory documents through Cambridge China Bridge.
Define the assembly before ordering
Start with a layout showing the machines, transfer points, shared controls and connection to surrounding equipment. Ask your integrator to assess whether the units perform a common function, affect each other's operation and share a control system. HSE distinguishes an assembly from connected machines that function independently.
Record the proposed assembly boundary and the reasoning behind it. Identify equipment outside that boundary and its connections to the line. Use our machinery sourcing guide for individual-machine purchasing checks; this guide addresses the evidence needed when those machines work together.
Identify who takes assembly responsibility
HSE considers the person constituting the assembly to be its manufacturer, responsible for the assembly's compliance with the machinery health and safety requirements, including conformity marking. Buying machines from separate factories does not settle responsibility for the completed line.
Before ordering, identify who will undertake that role and who will compile the file, assess interfaces, approve changes and complete the conformity assessment. Put the agreed scope in writing. Ask who will issue the completed assembly's declaration of conformity and provide its instructions. Separate factory paperwork from the assembly deliverables.
Collect constituent declarations and instructions
HSE requires the assembly file to include declarations of conformity for incorporated complete machines, and declarations of incorporation with assembly instructions for incorporated partly completed machinery. Keep these documents against the actual unit supplied, with its model, serial identity and document revision.
Create a supplier document register before shipment. Compare declarations, labels, drawings and instructions with the delivered equipment; flag missing guards, conflicting identities and unresolved installation conditions. Ask Cambridge China Bridge's staff in China to request the factory documents. Arrange document delivery alongside the support covered in our installation and commissioning guide.
Assess interfaces and keep proof of controls
HSE requires the assembly risk assessment to cover constituent suitability, hazards at interfaces and assembly hazards not covered by the suppliers' declarations and instructions. Examine transfer-point trapping, access between guards, unexpected restart, emergency-stop coverage and stored energy during jam clearing.
For each hazard, record the operating or maintenance task, exposed person, control measure and verification result. Keep the line layout, guard drawings, control schematics, safety-function descriptions and test records together. Test interactions such as an upstream machine continuing to feed a stopped downstream unit. Use our technical file checklist for the wider document structure. For sharing drawings with suppliers, see our guide to sending technical drawings to China.
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Record changes and close the assembly file
HSE requires the file to document modifications made to constituent units during integration. Keep a change register covering guards, transfer equipment, control logic, operating modes and settings, with updated drawings and repeat verification where appropriate. For changes to an existing assembly, HSE calls for case-by-case assessment; very substantial changes may create a new assembly requiring conformity assessment.
Before accepting the line, reconcile the file with the installed configuration. Keep the assembly risk assessment, constituent documents, modification records, verification results, completed assembly declaration and instructions in a controlled handover pack. Resolve open safety issues before operational acceptance. Record who holds the file and who updates it after later changes.
Frequently asked questions
Are individual machine declarations enough for a production line?
They are constituent evidence. HSE also requires assembly risk assessment covering interfaces and hazards outside the constituent declarations and instructions.
Who is responsible for an assembled production line?
HSE considers the person constituting the assembly to be its manufacturer, responsible for conformity of the assembly as a whole. Identify that party before ordering.
What paperwork is needed for partly completed machinery?
Include its declaration of incorporation and assembly instructions in the assembly technical file. Match them to the unit actually incorporated and resolve the stated installation conditions.
Does adding a machine mean reassessing the whole line?
HSE calls for case-by-case assessment of existing assemblies. Machines unaffected by the addition do not need reassessment; document which interfaces, controls and risks change.