API 660, PED and
Canadian CRN

U-Tube Heat Exchangers For

API 660, PED and Canadian CRN
U-Tube Duty

Three requirements that arrive from outside the design: an industry standard, a European directive and a Canadian registration. Each adds cost and schedule, and each needs to be known at inquiry.

API 660. The American Petroleum Institute standard for shell and tube heat exchangers in refinery service, layered on top of ASME and TEMA. It adds requirements on design detail, material selection, fabrication, inspection and documentation, and it reflects refinery operating experience.

PED. The European Pressure Equipment Directive governs equipment placed on the market in the EU. Conformity assessment, CE marking and a notified body where the category requires it. An ASME-stamped vessel is not automatically PED compliant; the assessment is separate.

Confirm Whether You Actually Need API 660. API 660 appears in specifications well outside refining, sometimes because a specification was copied from a refinery project. It adds real cost and schedule.

Where the site is genuinely a refinery or petrochemical facility with an API-based standard, it is appropriate. Where the intent is simply robust construction, TEMA Class R frequently satisfies that intent for considerably less.