scope:

1 Scope

This standard covers the minimum requirements for design, materials, fabrication, inspection, testing, and preparation for shipment of refinery process air-cooled heat exchangers.

The air-cooled heat exchanger shall be of the forced- or induced-draft type and shall include components as described in Figure 1 and any auxiliaries such as ladders and platforms.

1.1 GENERAL

† All pressure components of the exchanger including supplemental steam coils shall conform to the requirements of Section VIII, Division 1 of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code and the supplemental requirements herein, regardless of whether code stamping is required.

† When the exchanger is to contain lethal substances as noted on the specification sheet, construction of pressure parts shall be in accordance with paragraph UW-2 (a), Section VIII, Division 1 of the ASME Code.

• The vendor shall comply with local rules and regulations that are specified by the purchaser.

Note: A bullet (•) at the beginning of a paragraph indicates where a decision may be required of the purchaser which may not be obvious from the specification sheet (see checklist shown in Appendix B). A dagger (†) at the beginning of a paragraph indicates where an item or items are mentioned which appear on the air-cooled heat exchanger specification sheet (see Appendix D).

1.2 CONFLICTING REQUIREMENTS

1.2.1 In case of conflict between this standard and the inquiry or order, the inquiry or order shall govern.

1.2.2 Unless an exception is specifically stated as such in the order, the vendor shall obtain written approval from the purchaser before proceeding with the work affected by a conflict between the proposal and the order.

1.3 NOMENCLATURE

Figure 1 shows typical components of an air-cooled heat exchanger. Figure 2 shows typical bay arrangements. Figures 3 and 4 show typical construction of tube bundles with removable-cover-plate and removable-bonnet headers. Figure 5 shows typical construction of a tube bundle with plug headers. Figure 6 shows typical plenum arrangements. Figure 7 shows typical drive arrangements.