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Background on the ASME Code

ASME issued its first standard, “Code for the Conduct of Trials of Steam Boilers” in 1884. It subsequently evolved into “Rules for the Construction of Stationary Boilers and for Allowable Working Pressure” – the first edition of ASME’s now-legendary Boiler and Pressure Vessel Code (BPVC) issued in 1914 and published in 1915.

The ASME Code is kept current by nearly 1,000 volunteer technical experts. It remains a worldwide model for assuring safety, reliability and operational efficiency. The boiler and pressure vessel sections of the BPVC have long been considered essential within the electric power-generation, petrochemical, transportation and other industries.

Section I – Power Boilers

Provides requirements for all methods of construction of power, electric, and miniature boilers; high  temperature water boilers, heat recovery steam generators, and certain fired pressure vessels to be used in stationary service; and power boilers used in locomotive, portable, and traction service.

Section II – Materials

Part A covers Ferrous Material; Part B covers Nonferrous Material; Part C covers Welding Rods, electrodes, and Filler Metals; and Part D covers Material Properties in both Customary and Metric units of measure. Together, these four parts of Section II comprise a “Service Code” to other BPVC Sections, providing material specifications adequate for safety in the field of pressure equipment. These specifications contain requirements for chemical and mechanical properties, heat treatment, manufacture, heat and product analyses, and methods of testing.

Section III – Rules for Construction of Nuclear Facility Components

Provides general requirements which address the material, design, fabrication, examination, testing and overpressure protection of the items specified within each respective Subsection, assuring their structural integrity.

Section IV – Heating Boilers

Provides requirements for design, fabrication, installation and inspection of steam heating, hot water heating, hot water supply boilers, and potable water heaters intended for low pressure service that are directly fired by oil, gas, electricity, coal or other solid or liquid fuels.

Section V – Nondestructive Examination

Is another “Service Code”- containing requirements and methods for nondestructive examination which are referenced and required by other BPVC Sections. It also includes manufacturer’s examination responsibilities, duties of authorized inspectors and requirements for qualification of personnel, inspection and examination. Examination methods are intended to detect surface and internal discontinuities in materials, welds, and fabricated parts and components.

Section VI – Care and Operation of Heating Boilers

Covers operation guidelines applicable to steel and cast-iron boilers limited to the operating ranges of Section IV Heating Boilers. Section VI includes guidelines for associated controls and automatic fuel-burning equipment.

Section VII – Care of Power Boilers

Provides guidelines to assist those directly responsible for operating, maintaining, and inspecting power boilers. These boilers include stationary, portable, and traction type boilers, but not locomotive and high-temperature water boilers, nuclear power-plant boilers (see Section XI), heating boilers (see Section VI), pressure vessels, or marine boilers.

Guidelines are also provided for operation of auxiliary equipment and appliances that affect the safe and reliable operation of power boilers.

Section VIII – Pressure Vessels

Division 1 provides requirements applicable to the design, fabrication, inspection, testing, and  certification of U (unfired or fired) pressure vessels operating at either internal or external pressures exceeding 15 psig. This pressure may be obtained from an external source or by the application of heat from a direct or indirect source, or any combination thereof. Specific requirements apply to several classes of material used in pressure vessel construction, and also to fabrication methods such as welding, forging and brazing.

Division 1 contains mandatory and non-mandatory appendices detailing supplementary design criteria, nondestructive examination and inspection acceptance standards.

Division 2 requirements on materials, design, and nondestructive examination are more rigorous than in Division 1; however, higher design stress intensify values are permitted. These rules may also apply to human occupancy pressure vessels typically in the diving industry.

Division 3 requirements are applicable to pressure vessels operating at either internal or external pressures generally above 10,000 psi. It does not establish maximum pressure limits for either Section VIII, Divisions 1 or 2, nor minimum pressure limits for this Division.

Section IX – Welding and Brazing Qualifications

Is another “Service Code”– containing rules relating to the qualification of welding and brazing procedures as required by other BPVC Sections. It also covers rules relating to the qualification and requalification of welders, brazers, and welding and brazing operators in order that they may perform welding or brazing in component manufacture.

Section X – Fiberglass-Reinforced Plastic Pressure Vessels

Provides requirements for construction of an FRP pressure vessel in conformance with a manufacturer’s design report.  It includes production, processing, fabrication, inspection and testing methods required for the vessel.

Section XII – Transport Tanks

Provides requirements for construction and continued service of pressure vessels for the transportation of dangerous goods via highway, rail, air or water at pressures from full vacuum to 3,000 psig and volumes greater than 120 gallons.

Section XI – Rules for Inservice Inspection of Nuclear Power Plant Components

Constitutes requirements to maintain the nuclear power plant while in operation and to return the plant to service, following plant outages, and repair or replacement activities. These rules require a mandatory program of scheduled examinations, testing, and inspections to evidence adequate safety. The method of nondestructive examination to be used and flaw size characterization are also contained within this Section.

 

Reference

ASME Boiler and Pressure Vessel Code  (go.asmeorg/bpvc13)

 

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