Asme B 31.8 Plus A Number

The pipeline may not be offshore. For B31.4, the test section must be regularly patrolled and communication maintained Rules for Testing (contd.) Each building within 300 ft must be unoccupied during the test unless the hoop stress is between 20 and 50 of the SMYS.

Codes vs Standards.

Piping codes defines the requirements of design, fabrication, use of materials, tests and inspection of pipes and piping systems.

The code covers boiler external piping for power boilers and high temperature, high pressure water boilers in which steam or vapor is generated at a pressure of more than 15 PSIG; and high temperature water generated at temperatures exceeding 250 degrees F B31.3- Process Piping This piping is typically found in petroleum refineries, chemical and pharmaceutical plants.

This Code applies to piping for all fluids including: Raw, intermediate, and finished chemicals 2.

Fluidized solids 5.

Well-known pipeline is the Alaskan Pipeline from Prudhoe Bay in Alaska to Valdez.

B31.5, Refrigeration Piping and Heat Transfer Components This Code for refrigerant, heat transfer components and secondary coolant piping for temperatures as low as -196 deg C.

This code does not apply to water piping, piping for pressure vessels.

B31.8 - Gas Transmission and Distribution Piping Systems This Code covers the design, fabrication, installation, inspection, and testing of pipeline facilities used for the transportation of gas.

This Code also covers safety aspects of the operation and maintenance of those facilities.

B31.8S- Managing System Integrity of Gas Pipelines This Standard applies to on-shore pipeline systems constructed with ferrous materials and that transport gas.

This Standard is specifically designed to provide the operator with the information necessary to develop and implement an effective integrity management program utilizing proven industry practices and processes.

B31.9- Building Services Piping This Code Section has rules for the piping in industrial, institutional, commercial and public buildings, and multi-unit residences.

Building Services Piping applies to Condensing water, Water for heating and cooling, Steam and condensate, Vacuum.

B31.11 - Slurry Transportation Piping Systems Design, construction, inspection, security requirements of slurry piping systems It 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.

Materials The classification of piping is basically done by their location.

The first is aboveground piping, which is usually within the boundaries of a property or building.

The second is buried piping, which usually goes through public rights-of-way andor across rights-of-way on private land.

Asme B 31.8 Plus A Number

Division of the codes The following division of the codes is done on the type of piping Materials Aboveground 2 basic characteristics: - Wide range of Fluids - Wide range of temperature pressure For metallic materials the ASME designations have a letter plus a number.

Eg. SA-106 for ferrous materials and SB-106 for nonferrous materials.

Aboveground codes Each aboveground code has wide range of materials for the given temperature and type of fluid.

All aboveground codes provide some means of utilizing unlisted materials which are desirable from users point of view.

New Material Addition Basic requirements and the actions - Chemical composition - Mechanical properties - Tensile data per ASTM E-21 - Creep properties - If it is to be welded, welding data in accordance with ASME - Any special application or handling required Codes for Buried Materials Buried piping codes have significantly fewer listed materials and carbon steels for most of piping Codes B31.4 and B31.11 are much less flexible.

They simply state that materials that do not conform to one of the listed standards shall be qualified by petitioning the code committee for approval B31.8 has a detailed listing recognizing the categories of piping; it lists specific categories and description outlining the qualifications procedure Nonmetallic materials Following codes mention about use of non metallic materials: - B31.1 - B31.3 - B31.8 - B31.9 In these codes all required properties of nonmetallic materials are specified.

Eg. Allowable stress Also in B31.8 there is a detailed information about use of thermo plastic pipes.

Nonmetallic materials (Specific Requirements) Thermoplastics are prohibited aboveground for flammable fluids.

PVC and CPVC are prohibited from being used with compressed gas.

Safeguarding is required for reinforced plastic mortar (RPM) and all fluids, Safeguarding reinforced thermosetting resin (RTR) for use in toxic or flammable service.

Safeguarding against rapid temperature changes shall be employed in fluid services.

Inspection, Examination, Testing For Buried Pipes For Aboveground Pipes Buried Piping Requirements In B31.4 or B31.8 all welds shall be visually inspected by an inspector qualified through training or experience.

Code B31.11 is silent on visual inspection requirements Testing of buried pipe The B31.4 and B31.11 test requirements are somewhat less stringent than those of B31.8 The major tests are different depending on whether the pipeline is to be operated above 20 of Specified Minimum Yield Strength (SMYS) or below.

Rules for Testing The test pressure shall be 1.25 times internal design pressure and held for not less than 4 hours.

If the components are visually inspected during the test, no further tests are required for them else the test pressure is lowered to 1.1 times and tested Water shall be used; there are exceptions listed.

The pipeline may not be offshore.

For B31.4, the test section must be regularly patrolled and communication maintained Rules for Testing (contd.) Each building within 300 ft must be unoccupied during the test unless the hoop stress is between 20 and 50 of the SMYS.

Asme B 31.8 Free Download