1.1 This Recommended Practice provides supplementary guidelines and practices for welding and welding related topics for shop and field fabrication, repair and modification of:
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. Non-removable internals for process equipment
d. Structural items attached and related to process equipment
e. Any other equipment or component item when referenced by an applicable purchase document