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Shell and tube heat exchanger application and required process result; Fluid and temperature duty: Provide each circuit's fluid composition, inlet and outlet temperatures, flow range, working pressure and allowable pressure drop. State fouling, corrosion and contamination consequences.; Tube bundle and maintenance access: Compare materials, pass arrangement, removable components and cleaning method. Connection size does not establish thermal capacity, and cooling-water temperature can govern the achievable outlet.; Representative input variation and difficult production cases; Required acceptance evidence: Verify pressure integrity and the agreed heat balance with recorded flows and temperatures. Define which side is tested, applicable pressure limits and the treatment of leakage between circuits.; Site and utility scope: Plan supported piping, expansion accommodation, drains, vents and clearance to remove serviceable internals. Confirm cooling-water quality and corrosion control.; Service provision: Inspect tube fouling, seals and corrosion according to the actual fluid duty. Trend pressure drop and temperature approach to distinguish fouling from changes in inlet conditions.; OEM/ODM engineering scope: OEM circuit connections may be configured; ODM fluids, metallurgy or pressure boundaries require qualified thermal and mechanical design.; Upstream preparation and downstream handling interfaces; Destination country and applicable installation requirements; Production schedule, changeover mix and operator availability; Drawings, samples, inspection method and rejected-output criteria.