Does a PED Certified Heat Exchanger Always Need a Notified Body? The Category Rules

PED and CE Certified Floating Head Exchangers for European Projects

AES and AEW floating head heat exchangers are the workhorses of high temperature process duty, and Europe is where the compliance bar is highest. Yuhong Group now supplies PED 2014/68/EU compliant and CE marked floating head shell and tube heat exchangers, with notified body involvement applied where the equipment category requires it. This allows European process plants and skid builders to place these units into service without re-certification, while keeping Category I units on the lower cost self-assessment route.

The floating head exists for one reason: differential thermal expansion. When the shell and the tube bundle operate at materially different temperatures, a fixed tubesheet design transfers that expansion into the tubes and the shell, which means stressed welds and eventual leakage. A floating head lets the bundle move, so the mechanical load is absorbed by the packing or the gasket rather than by the metal.

Certification Scope

• PED 2014/68/EU: risk category determined per vessel from volume and pressure using the PED 2014/68/EU Annex II conformity assessment chart (Category I to IV). Notified body involvement applies from Category II upward, through module A2, D1, E1 or higher depending on category and volume; Category I units may follow the self-assessment route with a technical file and CE marking.
• CE marking: declaration of conformity, nameplate marking and technical file retained for the required period.
• Design basis: ASME Section VIII Division 1 or EN 13445, TEMA class R and class C mechanical standards, with the dual standard option available for multinational operators.
• Materials with European certificates: EN 10028 plate, EN 10216 tubes and EN 10222 forgings with 3.1 or 3.2 certification on request.
• Supporting compliance: NACE MR0175 for sour service, ATEX related documentation where flammable duty applies, and full NDT and hydrotest records.

Mechanical Range

Practical Notes for European Buyers

Three issues recur in European tenders for floating head exchangers. First, girth flange and split backing ring tolerances: a bundle that cannot be withdrawn defeats the purpose of the design, so we machine and trial fit the assembly before shipment. Second, documentation language: technical files are issued in English, with German and French translation available for notified body submission. Third, maintenance access: shell nozzles, test rings and lifting lugs are positioned so that the bundle can be pulled without removing adjacent pipework.

For high temperature duty the thermal design is verified in HTRI, and where the client specifies a fouling allowance we calculate the resulting outlet temperature rather than assuming it. Where pressure drop is critical, baffle cut and spacing are adjusted and reported in the design sheet so the mechanical drawing and the process duty stay aligned.

Lead Time and Support

PED certified floating head exchangers ship in 50 to 80 working days depending on notified body scheduling. Yuhong Group supports the conformity assessment process directly, including liaison with the notified body, submission of the technical file and clarification of any design review comments, so that the certificate is issued against the unit actually built rather than a generic design.

Frequently Asked Questions