ASME SECTION 4

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ASME Section IV: Rules for Construction of Heating Boilers

ASME Section IV is one of the most important and widely used standards for the design, construction, inspection, and testing of heating boilers used in power plants, oil & gas facilities, petrochemical plants, and industrial heating systems.

This standard, titled “Rules for Construction of Heating Boilers,” provides comprehensive requirements for the safe design and manufacture of heating boilers operating at low pressures.

In addition, ASME Section VI serves as a complementary standard covering the Care and Operation of Heating Boilers, including maintenance, inspection, and operational guidelines.

As shown in the table of contents, ASME Section IV is divided into several major parts covering material requirements, design criteria, fabrication methods, inspection procedures, and testing requirements for various types of heating boilers, including:

• Cast Iron Heating Boilers
• Cast Aluminum Heating Boilers
• Welded Heating Boilers
• Brazed Boilers
• Potable Water Heaters
• Packaged and Specialized Heating Boiler Systems

Each major section is further subdivided into individual chapters known as Articles, which provide detailed technical requirements and engineering guidance.

Key Topics Covered in ASME Section IV

• General Requirements for Heating Boilers
• Design Rules and Calculations
• Materials and Material Specifications
• Fabrication and Manufacturing Requirements
• Welding and Brazing Requirements
• Inspection and Testing Procedures
• Hydrostatic Testing Requirements
• Cast Iron and Cast Aluminum Boilers
• Potable Water Heaters
• Safety Valves and Pressure Relief Devices
• Certification, Stamping, and Documentation Requirements
• Quality Control and Compliance Procedures

This standard is an essential reference for mechanical engineers, boiler manufacturers, inspectors, quality control personnel, maintenance engineers, and professionals working in power generation, oil & gas, and petrochemical industries.

Main Contents of This Standard:

• Part HG General Requirements for All Materials of Construction
• Part HF Requirements for Boilers Constructed of Wrought Materials
• Part HF — Subpart HW Requirements for Boilers Fabricated by Welding
• Part HF — Subpart HB Requirements for Boilers Fabricated by Brazing
• Part HC Requirements for Boilers Constructed of Cast Iron
• Part HA Requirements for Boilers Constructed of Cast Aluminum
• Part HLW Requirements for Potable‐Water Heaters
• Appendix
• FIGURES
• TABLES