API stands for American Petroleum Institute and the API code contains standards used for fabrication of pressure vessels like heat exchangers in the petroleum industry. Please visit www.api.org for more information. I am not sure about what IRB stands for except as referring to “iron reducing bacteria” when discussing corrosion of heat exchangers or the Institutional Review Board. ISO 14000 and ISO 14001 are a set of international standards on environmental management. Please visit www.iso.org for more information. The design of plate heat exchangers requires the knowledge of available plate designs and is covered by Hewitt, Shires & Bott in “Process Heat Transfer.”