ASME - American Society of Mechanical Engineers

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ASME B31.3 - Process Piping

Date of Issuance: April 30, 2002
Mandatory Date: Oct. 30, 2002
This edition was approved by the American National Standards Institute and designated ASME B31.3-2002 on Feb. 14, 2002.

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; and
6. cryogenic fluids.

(c) See Fig. 300.1.1 for a diagram illustrating the application of B31.3 piping at equipment. The joint connecting piping to equipment is within the scope of B31.3.

Packaged Equipment Piping. Also included within the scope of this Code is piping which interconnects pieces or stages within a packaged equipment assembly.

Exclusions. This Code excludes the following:

1. piping systems designed for internal gage pressures at or above zero but less than 105 kPa (15 psi), provided the fluid handled is nonflammable, nontoxic, and not damaging to human tissue as defined in 300.2, and its design temperature is from -29 C (-20 F) through 186 C (366 F);
2. power boilers in accordance with BPV Code Section I and boiler external piping which is required to conform to B31.1;
3. tubes, tube headers, crossovers, and manifolds of fired heaters, which are internal to the heater enclosure; and
4. pressure vessels, heat exchangers, pumps, compressors, and other fluid handling or processing equipment, including internal piping and connections for external piping.

Reference Standards
Specifications and standards of the following organizations appear in Appendix E of ASME B31.3

• API (American Petroleum Institute)
• ASCE (The American Society of Civil Engineers)
• ASME (ASME International)
• ASNT (American Society for Nondestructive Testing Inc.)
• ASQ (American Society for Quality)
• ASTM (ASTM International)
• AWWA (American Water Works Association)
• AWS (American Welding Society)
• CDA (Copper Development Association Inc.)
• CGA (Compressed Gas Association Inc.)
• CSA (CSA International)
• EJMA (Expansion Joint Manufacturers Association)
• ICBO (International Conference of Building Officials)
• MSS (Manufacturers Standardization Society of the Valve and Fittings Industry Inc.)
• NACE (NACE International)
• NFPA (National Fire Protection Association)
• PFI (Pipe Fabrication Institute)
• PPI (Plastics Pipe Institute)
• SAE (Society of Automotive Engineers)

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