These units are usually designed by custom specification only. They can be supplied in a wide variety of unit types (TEMA types), material types and to the most rigid of specifications.

Bos-Hatten has done a number of offshore floating production heat exchangers for chemical refineries that have included ASME codes, Norwegian Petroleum Directorate specifications, Norsolk Specifications, BS5500 (British Code) and AS 1210 (Australian Code), Det Norski Veritas, Bureau Veritas, Lloyds Registry and others