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This International Standard gives requirements and recommendations for the mechanical design, materials selection, fabrication, inspection, testing, and preparation for shipment of plate heat exchangers, sometimes referred to as plate-and-frame heat exchangers, for use in petroleum and natural gas industries. This International Standard covers gasketed, semi-welded and welded plate heat exchangers constrained within a frame. As used in this International Standard, the term heat exchangers, or exchangers, includes coolers, heaters, condensers, evaporators and reboilers.