ASME B31.9:2004 pdf free download Building Services Piping
900GENERAL
This Building Services Piping Code is a Section ofThe American Society of Mechanical Engineers Codefor Pressure Piping, B31.This Section, herein called theCode, is published as a separate document for conve-nience.
Standards and specifications incorporated by refer-ence in this Code are shown in Table 926.1,MandatoryAppendix I, and elsewhere. It is not considered practicalto refer to a dated edition of each standard or specifica-tion where referenced. Instead, the dated edition refer-ences are included in Mandatory Appendix I1I.
The user is cautioned that the local building codemust be observed and adhered to when its requirementsare more stringent than those of this Code.
Components of piping systems shall conform to thespecifications and standards listed in this Code. Pipingelements neither specifically approved nor specificallyprohibited by this Code may be used provided they arequalified for use as set forth in applicable chapters ofthis Code.
Engineering requirements of this Code, while consid-ered necessary and adequate for safe design, generallyemploy a simplified approach. An engineer capable ofapplying a more rigorous analysis shall have the latitudeto do so.He must be able to demonstrate the validityof his approach.
900.1 Scope
900.1.1 Coverage and Application. This Code Sectionhas rules for the piping in industrial, institutional, com-mercial, and public buildings,and multi-unit residences,which does not require the range of sizes,pressures,and temperatures covered in B31.1. This Code prescribesrequirements for the design, materials, fabrication,installation, inspection, examination, and testing of pip-ing systems for building services. It includes piping sys-tems in the building or within the property limits.
900.1.2 Services and Limits
(a) Seroices.This Code applies to the following build-ing services, except as excluded in para. 900.1.3:
(1) water and anti-freeze solutions for heating andcooling
(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 Codeincludes boiler external piping within the followinglimits:
(1) for steam boilers, 15 psig (103 kPa gage) max.(2) for water heating units,160 psig (1 103 kPagage) max. and 250°F (121C) max.
Boiler external piping above these pressure or temper-ature limits is within the scope of ASME B31.1.Boilerexternal piping is the piping connected to the boiler andextending to the points identified in Fig. 900.1.2B.(c) Material and Size Linits. Piping systems of the fol-lowing materials are within the scope of this Code,through the indicated maximum size(and wall thicknessif noted):
1) carbon steel: NPS 30 (DN 750) and 0.500 in.(12.7mm) wall
(2) stainless steel: NPS 12 (DN 300) and 0.500 in.(12.7 mm) wall
(3) aluminum: NPS 12 (DN 300)
(4) brass and copper: NPS 12 (DN 300) and 12.125in. (308 mm) O.D. for copper tubing
(5) thermoplastics: NPS 24(DN600)(6) ductile iron: NPS 18(DN 450)
(7) reinforced thermosetting resin: 24 in. (600 mm)nominal
Other materials may be used as noted in Chapter IIIl.(d)Pressure Limits. Piping systems with working pres-sures not in excess of the following limits are within thescope of this Code:
(i) steam and condensate: 150 psig (1 034 kPa g)(2) liquids: 350 psig (2 413 kPa g)
(3) vacuum: 1 atm external pressure
(4) compressed air and gas: 150 psig (1 034 kPa g)(e) Temperature Limits. Piping systems with workingtemperatures not in excess of the following limits arewithin the scope of this Code:
(1) steam and condensate: 366°F (186°C)(2) other gases and vapors: 200°F (93C)
(3) other nonflammable liquids: 250°F(121C)The minimum temperature for all services is 0F(-18°C).
900.1.3 Exclusions. This Code does not apply toeconomizers, heaters, pumps,tanks,heat exchangers,
ASME B31.9:2004 pdf free download
