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Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 1, Fourth Edition

K. R. Rao
K. R. Rao
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ASME Press
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To help the reader understand and use the ASME Boiler and Pressure Vessel (B&PV) Code, this chapter for ASME Code Section IV2 (2010 edition) is presented in a simplified manner with the understanding that it is not a Codebook and was not written to replace the Codebook published by the American Society of Mechanical Engineers (ASME).

Although the rules of the ASME B&PV Code, Section IV constitute the minimum requirements for the safe design, construction, installation, and inspection of low-pressure-steam boilers and hotwater boilers (which are directly fired with oil, gas, electricity, or other solid or liquid fuels), they do not cover the operation, repair, alteration, rerating, and maintenance of such boilers. By definition, a low-pressure-steam boiler is a steam boiler in which the operating pressure does not exceed 15 psi (103 kPa), whereas a hot-water boiler is defined as a boiler used for an operating pressure not exceeding 160 psi (1,100 kPa) and/or for a temperature not exceeding 250_F (121_C). Hot-water boilers include hot-waterheating boilers and hot-water-supply boilers. Also covered by the rules of Section IV are potable-water heaters and water-storage tanks for operation at pressures not exceeding 160 psi (1,100 kPa) and water temperatures not exceeding 210_F (99_C).

18.1 Introduction
18.2 Part HG: General Requirements for All Materials of Construction
18.3 Part HF: Requirements for Boilers Constructed of Wrought Materials
18.4 Part HF, Subpart HW: Requirements for Boilers Fabricated by Welding
18.5 Part HF, Subpart HB: Requirements for Boilers Fabricated by Brazing
18.6 Part HC: Requirements for Boilers Constructed of Cast Iron
18.7 Rules of Part HA: Hot Water Heating Boilers Constructed Primarily of Cast Aluminum
18.8 Part HLW: Requirements for Potable-Water Heaters
18.9 Considerations Likely to be in Future Code Editions
18.10 What Should the ASME Code Committees and Regulators Consider, Recognizing the Intent of the ASME B&PV Code?
18.11 References
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