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B31 Code for pressure piping, developed byAmerican Society of Mechanical Engineers - ASME,covers Power Piping, Fuel Gas Piping, Process Piping, Pipeline Transportation Systems for LiquidHydrocarbons and Other Liquids, Refrigeration Piping and Heat Transfer Components and BuildingServices Piping. ASME B31 was earlier known asANSI B31.

B31.1 - 2001 - Power Piping

Piping for industrial plants and marine applications. This code prescribes minimum requirements forthe design, materials, fabrication, erection, test, and inspection of power and auxiliary service pipingsystems for electric generation stations, industrial institutional plants, central and district heatingplants.

The code covers boiler external piping for power boilers and high temperature, high pressure waterboilers in which steam or vapor is generated at a pressure of more than 15 PSIG; and hightemperature water is generated at pressures exceeding 160 PSIG and/or temperatures exceeding 250degrees F.

B31.2 - 1968 - Fuel Gas Piping

This has been withdrawn as a National Standard and replaced by ANSI/NFPA Z223.1, but B31.2 is still

available from ASME and is a good reference for the design of gas piping systems (from the meter tothe appliance).

B31.3 - 2002 - Process Piping

Design of chemical and petroleum plants and refineries processing chemicals and hydrocarbons,water and steam. This Code contains rules for piping typically found in petroleum refineries; chemical,pharmaceutical, textile, paper, semiconductor, and cryogenic plants; and related processing plants andterminals.

This Code prescribes requirements for materials and components, design, fabrication, assembly,erection, examination, inspection, and testing of piping. This Code applies to piping for all fluidsincluding: (1) raw, intermediate, and finished chemicals; (2) petroleum products; (3) gas, steam, air

and water; (4) fluidized solids; (5) refrigerants; and (6) cryogenic fluids. Also included is piping whichinterconnects pieces or stages within a packaged equipment assembly.

B31.4 - 2002 - Pipeline Transportation Systems for Liquid Hydrocarbons and OtherLiquids

This Code prescribes requirements for the design, materials, construction, assembly, inspection, andtesting of piping transporting liquids such as crude oil, condensate, natural gasoline, natural gasliquids, liquefied petroleum gas, carbon dioxide, liquid alcohol, liquid anhydrous ammonia and liquidpetroleum products between producers' lease facilities, tank farms, natural gas processing plants,refineries, stations, ammonia plants, terminals (marine, rail and truck) and other delivery and receivingpoints.

Piping consists of pipe, flanges, bolting, gaskets, valves, relief devices, fittings and the pressurecontaining parts of other piping components. It also includes hangers and supports, and otherequipment items necessary to prevent overstressing the pressure containing parts. It does not includesupport structures such as frames of buildings, buildings stanchions or foundations

Requirements for offshore pipelines are found in Chapter IX. Also included within the scope of thisCode are:

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(A) Primary and associated auxiliary liquid petroleum and liquid anhydrous ammoniapiping at pipeline terminals (marine, rail and truck), tank farms, pump stations, pressurereducing stations and metering stations, including scraper traps, strainers, and prover loop;

(B) Storage and working tanks including pipe-type storage fabricated from pipe andfittings, and piping interconnecting these facilities;

(C) Liquid petroleum and liquid anhydrous ammonia piping located on property whichhas been set aside for such piping within petroleum refinery, natural gasoline, gas processing,ammonia, and bulk plants;

(D) Those aspects of operation and maintenance of liquid pipeline systems relating tothe safety and protection of the general public, operating company personnel, environment,property and the piping systems.

B31.5 - 2001 - Refrigeration Piping and Heat Transfer Components

This Code prescribes requirements for the materials, design, fabrication, assembly, erection, test, andinspection of refrigerant, heat transfer components, and secondary coolant piping for temperatures aslow as -320 deg F (-196 deg C), whether erected on the premises or factory assembled, except as

specifically excluded in the following paragraphs.

Users are advised that other piping Code Sections may provide requirements for refrigeration piping intheir respective jurisdictions.

This Code shall not apply to:

(a) any self- contained or unit systems subject to the requirements of UnderwritersLaboratories or other nationally recognized testing laboratory:

(b) water piping;

(c) piping designed for external or internal gage pressure not exceeding 15 psi (105

kPa) regardless of size; or

(d) pressure vessels, compressors, or pumps,

but does include all connecting refrigerant and secondary coolant piping starting at the first jointadjacent to such apparatus.

B31.8 - 2003 - Gas Transmission and Distribution Piping Systems

This Code covers the design, fabrication, installation, inspection, and testing of pipeline facilities usedfor the transportation of gas. This Code also covers safety aspects of the operation and maintenanceof those facilities.

B31.8S-2001 - 2002 - Managing System Integrity of Gas Pipelines

This Standard applies to on-shore pipeline systems constructed with ferrous materials and thattransport gas.

Pipeline system means all parts of physical facilities through which gas is transported, including pipe,valves, appurtenances attached to pipe, compressor units, metering stations, regulator stations,delivery stations, holders and fabricated assemblies.

The principles and processes embodied in integrity management are applicable to all pipeline systems.This Standard is specifically designed to provide the operator (as defined in section 13) with the

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information necessary to develop and implement an effective integrity management program utilizingproven industry practices and processes.

The processes and approaches within this Standard are applicable to the entire pipeline system.

B31.9 - 1996 - Building Services Piping

This Code Section has rules for the piping in industrial, institutional, commercial and public buildings,and multi-unit residences, which does not require the range of sizes, pressures, and temperaturescovered in B31.1.

This Code prescribes requirements for the design, materials, fabrication, installation, inspection,examination and testing of piping systems for building services. It includes piping systems in thebuilding or within the property limits.

B31.11 - 2002 - Slurry Transportation Piping Systems

Design, construction, inspection, security requirements of slurry piping systems.

Covers piping systems that transport aqueous slurries of no hazardous materials, such as coal,mineral ores and other solids between a slurry processing plant and the receiving plant.

B31G - 1991 - Manual for Determining Remaining Strength of Corroded Pipelines

A supplement To B31 Code-Pressure Piping