ASME B31.3

Description / Abstract: Key changes to this revision include:

• Severe Cyclic Conditions

• MPa Allowable Stresses

• Expansion Joints

• Flange Joint Assembly

• Ultrasonic Examination Acceptance Criteria

• Category M Fluid Service Examination

• LeakTesting of Instrument Connections

• LeakTesting of Vacuum Systems

• LeakTesting of Insulated Systems

• Leak Testing ofAssembled Piping

Scope

Rules for the Process Piping Code Section B31.3 have been developed considering piping typically found in petroleum refineries; chemical, pharmaceutical, textile, paper, semiconductor, and cryogenic plants; and related processing plants and terminals.

Content and Coverage

(a) This Code prescribes requirements for materials and components, design, fabrication, assembly, erection, examination, inspection, and testing of piping.

(b) This Code applies to piping for all fluids, including

(1) raw, intermediate, and finished chemicals

(2) petroleum products

(3) gas, steam, air, and water

(4) fluidized solids

(5) refrigerants

(6) cryogenic fluids