Write the requirements
Ask separately about wetted materials, connections, cleaning and documentation. Clarify which component and operating condition a food-contact statement covers.
Describe operating scenarios
Include product changeovers and cleaning cycles. Establish which checks belong to the equipment supplier and which belong to the plant.
Separate documents from validation
A material certificate does not validate the complete process. ND and DW double-wall structures reduce intermixing risk but do not establish zero risk; materials, limits, leak detection and acceptance remain part of the assessment.
Prepare for the discussion
- Fluids, composition and relevant material requirements
- Flow rates and inlet/outlet temperatures on both circuits
- Design conditions and allowable pressure drop on each side
- Exact model, nameplate and current technical documents