ASME B31.9 pdf download

ASME B31.9 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 reference 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 specification 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 prohibi ted 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 considered 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, institutional, 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, fabrication, installation, inspection, examination, and testing of piping systems for building services. It includes piping systems in the building or within the property limits.
900.1.2 Services and Limits
(a) Services. This Code applies to the following building services, except as excluded in para. 900.1.3:
901.4 Ambient Influences
901.4.1 Cooling. Effects on Pressure. Where the cooling of a fluid may reduce the pressure in the piping to below atmospheric, the piping shall be designed to withstand the external pressure, or provision shall be made to break the vacuum.
901.4.2 FluId Expansion Effects. Where the expansion of a fluid may increase the pressure, the piping system shall be designed to withstand the increased pressure, or provision shall be made to relieve the excess pressure.
901.5 Dynamic Effects
(a) General. Piping shall be designed, arranged, and supported with due consideration of vibration, hydraulic shtwk, wind, and earthquake.
(b) Seismk Analtms. Seismic analysis and design for pipe supports and related structures shall be in accordance with the requirements of the governing building code for the jurisdiction in which the work is being performed.
901.6 Thermal Expansion and Contraction Loads
When a piping system is prevented from free thermal expansion and contraction as a result of anchors and restraints, thrusts and moments are set up that must be taken into account as set forth in paras. 902 and 919.
902 DESIGN CRITERIA
902.1 General
The provisions of para. 902 pertain to ratings, stress values, allowable stress criteria, design allowances, and minimum design values, and formulate the permissible variations in these factors when used in design of piping.
902.2 Pressure—Temperature Design Criteria for Piping Components
902.2.1 Components Having Specific Ratings
(a) For LisIed components. Pressure—temperature ratings have been established for certain piping components and are contained in some of the standards listed in Table 926,1. These ratings are accepted for use in accordance with this Code.
(b) For Conznents Not Listed. If it is necessary to use components that do not conform to standards listed in Table 926.1, they shall be qualified for pressure design.