ASME BPVC Section IV - Rules for Construction of Heating Boilers PDF

Codes and Standards for Power Engineers and Pressure Vessels • Chapter 3 Objective 6 Explain the content and use of ASME BPVC Section IV - Rules for Construction of Heating Boilers. ASME Section IV: Rules for Construction of Heating Boilers This section covers the minimum safety requirements for t...

Codes and Standards for Power Engineers and Pressure Vessels • Chapter 3 Objective 6 Explain the content and use of ASME BPVC Section IV - Rules for Construction of Heating Boilers. ASME Section IV: Rules for Construction of Heating Boilers This section covers the minimum safety requirements for the design, fabrication, installation and inspection of steam and hot water boilers intended for low-pressure or low temperature service (maximum 100 kPag steam pressure or maximum 120°C water temperature). It also contains appendices which cover: • Approval of new material • Methods of checking pressure relief valve capacity • Definitions relating to boiler design and welding • Quality control systems The code is divided into four parts, plus an appendix. A brief description of each of these follows. Each Part of ASME IV is prefixed with the letter “H” for “Heating”. The PanGlobal ASME Academic Extract contains the sections of ASME IV of most importance to the Power Engineer. Part HG - General Requirements for All Methods of Construction Part HG covers the fundamentals of all heating boiler designs. a) Materials used for boiler plate, forgings, castings, pipes, and tubes. b) Basic design calculations for cylindrical parts under internal pressure. This includes shells, drums, headers, and boiler piping. c) Basic design calculations for cylindrical parts, dished heads, flat heads, and covers. d) Requirements for openings in shells, heads, and headers and reinforcement required for these. e) Methods of attachment of pipes and nozzles to vessel walls. f ) Inspection openings and stayed surfaces. g) Outlets and external piping, and application requirements for the boiler proper. h) Requirements for miscellaneous pipe, valves, and fittings and the feedwater supply. i) Boiler pressure relief valve testing, capacity, mounting, and operation. j) Fabrication rules regarding cutting and identification of plate. k) Defects in materials, tube holes, and tube ends. l) Holes for threaded stays. m) Rules for the qualification of inspectors. n) Procedures for hydrostatic tests. o) Details for the stamping of boilers, pressure piping, and pressure relief valves. 4th Class Edition 3 • Part A 3-21 Unit A-3 • Introduction to Power Engineering and its Governance in Canada Part HF, Subpart HW - Requirements for Boilers Fabricated by Welding This Section of ASME IV covers: a) General requirements for boilers fabricated by welding. b) Material requirements for boilers and small parts. Welding processes and qualifications: a) Design of weldments. b) Fabrication requirements, including base metal preparation and repair of weld defects. c) Inspection during and after construction. Part HC - Requirements for Boilers Constructed of Cast Iron This Section of ASME IV covers: a) Material requirements for cast-iron boilers. b) Design requirements for maximum allowable stress on boiler parts. c) Requirements for testing to design pressure, bursting test procedure, and hydrostatic test procedure. d) Rules for quality control and inspection. Part HLW - Requirements for Portable Water Heaters This Section of ASME IV covers: a) b) c) d) e) f) g) Materials required for tank lining, pressure parts, flanges, and pipe fittings. Basic design calculations for all parts of a heater. Design of welded joints. Required pressure testing including proof tests and hydrostatic tests. Details regarding inspection and testing of heaters. Rules required for controls, temperature controls, limit controls, and electric wiring. Requirements for installation. Appendices Like ASME I, ASME IV has several Mandatory and Non-Mandatory Appendices. The Mandatory Appendices provide additional information. These are necessary to properly apply the code. The Non-Mandatory Appendices also provide additional information. However, they are only required when specifically referred to in the rules of the code. The Mandatory Appendices address items such as: a) Codes and standards referred to by ASME IV b) Nameplate attachment c) Vacuum boilers d) Standard units e) Rules for mass production of heating boilers The Non-Mandatory Appendices cover topics such as: a) b) c) d) e) f) 3-22 Estimating pressure relief valve capacity Method of checking pressure relief valve capacity Calculating the dimensions of a ring-reinforced furnace Reinforcement calculations for openings in vessels Quality control Manufacturer’s Data Reports 4th Class Edition 3 • Part A