ASME B31.9:2017 pdf free 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 byreference in this Code are shown in Table 926.1, Mandatory Appendix I, and elsewhere. It is not considered practical to referto adatededitionofeachstandard orspecification where referenced. Instead, the dated edition references 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. The Code generally specifies a simplified approach for many ofits requirements. A designer may choose to use a more rigorousanaly sistodevelop designand construction requirements. When the designer decides to take this approach, the designer shall provide to the owner details and calculations demonstrating that design, construction, examination, and testing are consistent with the criteria of this Code. These details shall be adequate for the owner to verify the validity and shall be approved by the owner. The details shall be docu- mented in the engineering design.
900.2 Terms and Definitions
adhesive bond: a union of materials by means of an adhesive. anchor: a structural attachmentdevice ormechanism that prevents the movementofpipe 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. automaticwelding:weldingwithequipmentthatperforms the welding operation without constant observation and adjustment ofcontrols by a welding operator. The equip- ment 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 ofthe end ofa branch pipe to the run ofa main pipe, with or withoutthe use ofa fitting. Figure 927.4.6-1 shows typical branch connections that do not use fittings.
consumableinsert:backingintheformoffillermetalthatis 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 milli- meterapproximationofthe inch pipe size using1 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 specifica- tions. A defect is cause for rejection.