Third Party Inspection for Heat Exchangers: What Ships With Each Unit and How to Verify It

Most heat exchanger disputes do not start in service; they start in the inspection file. Missing radiographs, a hydrotest certificate without a date, material certificates that do not match the stamped heat numbers, hardness records that were never signed. These are the reasons shipments are held at port and final payments are delayed.

Yuhong Group has therefore standardised third party inspection (TPI) and NDT documentation as a default part of every heat exchanger delivery, not as a paid option. Clients who nominate BV, TUV, SGS, Intertek or Lloyds register a witness scope; clients who do not still receive a complete inspection dossier so that their own QA department can audit the unit remotely.

• Design dossier: ASME Section VIII Division 1 design calculations, TEMA mechanical standard sheet, general arrangement and as-built drawings.
• Material traceability: EN 10204 3.1 certificates for shell plate, tubes, tubesheet, flanges and forgings, cross referenced to heat numbers stamped on the equipment nameplate and on each component.
• Welding records: WPS and PQR, welder qualification certificates and weld maps linking each seam to its welder and NDT result.
• NDT reports: radiographic testing of longitudinal and circumferential seams to the extent required by ASME Section VIII Division 1 UW-11, with acceptance per UW-51, ultrasonic testing of plate and forgings, dye penetrant and magnetic particle testing of nozzle and tube-to-tubesheet welds.
• Pressure testing: hydrostatic test per ASME UG-99 at 1.3 times maximum allowable working pressure, or at 1.5 times design pressure where specified, with calibrated gauge records and holding time, plus pneumatic test where water is not permitted, subject to client specification and the applicable code requirements.
• Surface and packing: surface preparation and painting report, final dimensional check sheet, packing list and photographs of the unit before crating.

For a refinery or power plant buyer, an inspection dossier is the difference between a commissioning date that holds and one that slips. For distributors and trading companies, it is the difference between a smooth customs clearance and a container sitting in port while a client asks for documents that were never produced.

In practice, the two questions we hear most from buyers are whether the exchanger was actually hydrotested and whether the third party inspector was independent. Both are answered by the same document set: a signed hydrotest certificate with gauge readings, and an inspection release note issued by the nominated agency rather than by the manufacturer. Yuhong Group provides both as standard, including the inspector's release note where TPI is nominated.

NDT and TPI scope can be tailored to API 660, PED or client specific specifications. Buyers are invited to send their inspection and documentation requirements with the enquiry so the scope and cost are clear before the order is placed, rather than discovered at shipment.