ASME B31.9:2016 pdf download

ASME B31.9:2016 pdf download.Building Services Piping
This Building Services Piping Code is a Section of The American Society of Mechanical Engineers Code for Pressure Piping, B31. This Section, herein called the Code, is published as a separate document for convenience. Standards and specifications incorporated by refer- ence in this Code are shown in Table 926.1, Mandatory Appendix I, and elsewhere. It is not considered practical to refer to a dated edition of each standard or specifica- tion where referenced. Instead, the dated edition refer- ences are included in Mandatory Appendix III. The user is cautioned that the local building code must be observed and adhered to when its requirements are more stringent than those of this Code. Components of piping systems shall conform to the specifications and standards listed in this Code. Piping elements neither specifically approved nor specifically prohibited by this Code may be used provided they are qualified for use as set forth in applicable chapters of this Code. Engineering requirements of this Code, while consid- ered necessary and adequate for safe design, generally employ a simplified approach. An engineer capable of applying a more rigorous analysis shall have the latitude to do so. He must be able to demonstrate the validity of his approach.
adhesive bond: a union of materials by means of an adhesive. anchor: a structural attachmentdevice or mechanismthat prevents the movement of pipe due to thermal expan- sion, 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 per- forms the welding operation without constant observa- tion 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. brazewelding: a joining process thatproduces 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 heatingto 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 nonflamma- ble or has a flash point above 150°F (66°C) as determined by the method of ASTM D93. brittle failure: a pipe failure mode that exhibits no mate- rial 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 approxi- mately 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. DN: 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 mini- mum applicable acceptance standards or specifications. A defect is cause for rejection.