American Petroleum Instltute (API) Second Edition, December 2009. 38 p. This Standard provides supplementary guidelines and practices for welding and welding related topics for shop and field fabrication, repair and modification of the following:
a) pressure-containing equipment such as pressure vessels, heat exchangers, piping, heater tubes, and pressure boundaries of rotating equipment and attachments welded thereto;
b) tanks and attachments welded thereto;
c) nonremovable internals for process equipment;
d) structural items attached and related to process equipment;
e) other equipment or component item when referenced by an applicable purchase document