ASME B31.9 pdf free download

ASME B31.9-2020 pdf free download.Building Services Piping ASME Code for Pressure Piping, B31.
900.1.4 Units of Measure. This Code states values in both USC and SI units. Within the text, the SI units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system of units should be used independently of the other.
When separate equations are provided for USC and SI units, those equations shall be executed using variables in the units associated with the specific equation. The results obtained from execution of these equations may be converted to other units.
When necessary to convert from one system of units to another, conversion should be made by rounding the values to the number of signilicant digits of implied precision in the starting value, but not less than four significant digits for use in calculations.
900.2 Terms and Definitions
adhesive bond: a union of materials by means of an adhesive.
anchor: a structural attachment device or mechanism that prevents the movement of pipe due to thermal expansion, expansion joint thrust, and other loads.
arc welding: a group of welding processes that produce coalescence of metals by heating them with an arc, with or without the use of filler metal.
assembly: the joining together of two or more piping components.
automatic welding: welding with equipment that performs the welding operation without constant observation and adjustment of controls by a welding operator. The equipment may or may not perform the loading and unloading of the work.
backing: material placed at the root of a weld joint to support molten weld metal.
backing ring: backing in the form of a ring.
ball or swivel joint: a joint that permits pipe motion by means of rotation.
base metal (material): the metal (material) to be welded. brazed, soldered, or cut.
boiler external piping (BEP): see para. 900.1.2(b).
branch connection: the attachment of the end of a branch pipe to the run of a main pipe. with or without the use of a fitting. Figure 927.4.6-1 shows typical branch connections that do not use fittings.
braze welding: a Joining process that produces coalescence of metals by using a filler metal whose liquidus is above 800°F (427°C) and below the solidus of the base metals. Unlike brazing, the filler metal is not distributed in the joint by capillary attraction.
brazing: a joining process that produces coalescence of metals by heating to a suitable temperature and by using a filler metal whose liquidus is above 800°F (427°C) and below the solidus of the base metals. The filler metal is distributed by capillary attraction between closely fitted joint surfaces.
brine: a liquid used for the transmission of heat without change of state in cooling systems, which is nonflammable or has a flash point above 150°F (66°C) as determined by the method of ASTM 093.
brittle failure:a pipe failure mode that exhibits no material deformation visible to the naked eye. e.g.. stretching, elongation, or necking down, in the area of the break
butt joint: a joint between two members aligned approximately in the same plane.
chilled water: water or an antifreeze solution used as a brine at a supply temperature below 60°F (16°C).
coalescence: the growing together or growth into one body of materials being welded, brazed, or soldered.
combustible liquid: a liquid having a flash point at or above
100°F (38°C).
consumable insert: backing in the form of filler metal that is melted into the root of the weld and fused with the base metals.
contractor: the entity responsible for fabrication and Installation of piping and associated equipment.
crack: a fracture-type imperfection characterized by a sharp tip and high ratio of length and depth to opening displacement.
Di”.’: metric designated pipe size. The number is the millimeter approximation of the inch pipe size using 1 in. equal to 25 mm. The pipe is still manufactured in inch sizes.
defect: an imperfection that by nature or accumulated effect renders a part of the piping unable to meet minimum applicable acceptance standards or specifications. A defect Is cause for rejection.
deposited metal: filler metal that has been added during a welding operation.
design pressure: the pressure, equal to or greater than the highest working pressure, used to determine the minimum permissible wall thickness or component rating. See para. 901.2.ASME B31.9 pdf download.