ASME B31.9-2014 pdf download
ASME B31.9-2014 pdf download.Building Services Piping.
900 GENERAL 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. 900.1 Scope 900.1.1 Coverage and Application. This Code Section has rules for the piping in industrial, institu- tional, commercial, and public buildings, and multi-unit residences, which does not require the range of sizes, pressures, and temperatures covered in B31.1. This Code prescribes requirements for the design, materials, fabri- cation, installation, inspection, examination, and testing of piping systems for building services. It includes pip- ing systems in the building or within the property limits. 900.1.2 Services and Limits (a) Services. This Code applies to the following build- ing services, except as excluded in para. 900.1.3: 1 (1) water and antifreeze solutions for heating and cooling (2) condensing water (3) steam or other condensate (4) other nontoxic liquids (5) steam (6) vacuum (7) compressed air (8) other nontoxic, nonflammable gases (9) combustible liquids including fuel oil (b) Boiler External Piping. The scope of this Code includes boiler external piping within the following limits: (1) for steam boilers, 15 psig (103 kPa gage) max. (2) for water heating units, 160 psig (1 103 kPa gage) max. and 250°F (121°C) max. Boiler external piping above these pressure or temper- ature limits is within the scope of ASME B31.1. Boiler external piping is the piping connected to the boiler and extending to the points identified in Fig. 900.1.2. (c) Material and Size Limits. Piping systems of the fol- lowing materials are within the scope of this Code, throughtheindicated maximumsize (andwall thickness if noted): (1) carbon steel: NPS 48 (DN 1 200) and 0.50 in. (12.7 mm) wall (2) stainless steel: NPS 24 (DN 600) and 0.50 in. (12.7 mm) wall (3) aluminum: NPS 12 (DN 300) (4) brass and copper: NPS 12 (DN 300) and 12.125 in. (308 mm) O.D. for copper tubing (5) thermoplastics: NPS 24 (DN 600) (6) ductile iron: NPS 48 (DN 1 200) (7) reinforced thermosetting resin: 24 in. (600 mm) nominal Other materials may be used as noted in Chapter III. (d) Pressure Limits. Piping systems with working pressures not in excess of the following limits are within the scope of this Code: (1) steam and condensate: 150 psig (1 034 kPa g) (2) liquids: 350 psig (2 413 kPa g) (3) vacuum: 1 atm external pressure
heat affected zone (HAZ): that portion of the base metal which has not been melted, but whose mechanical prop- erties or microstructure have been altered by the heat of welding, brazing, soldering, forming, or cutting. heat fusion: a joining process in which melted surfaces ofplasticpipe and fittingsare engaged and held together under moderate pressure until cool. imperfection: an abnormality or indication found during examination or inspection that is not necessarily a cause for rejection. See also defect. inert gas: a gas that does not combine with or affect the base material or filler material. inert gas metal arc welding: see gas metal arc welding, the preferred term. inspection: any operation performed to assure the owner that the materials, components, fabrication, and installa- tion are in accordance with the engineering design. Inspection may include review of certifications, welding procedure and welder qualifications, records of exami- nations and testing, and any examination that may be required by the engineering design. inspector: the owner, or a person representing the owner (notemployed bythe manufacturer, fabricator, or erector when different from the owner) who performs an inspection. joint design: the jointgeometrytogetherwiththe required dimensions. joint penetration: the minimum depth a groove weld extends from its face into a joint, exclusive of reinforce- ment. Joint penetration may include root penetration. See root penetration. liquidus: the lowest temperature at which a metal or alloy is completely liquid. main: as used in this Code, a section of pipe to which a branch or branches are connected.
