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CODES FOR VESSELS/HEAT EXCHANGERS

CODES FOR VESSELS/HEAT EXCHANGERS. Avinash Nayak . (46) Shrikantkumar Padhy (47) Jitendra Patil (48) Manoj Patil (49) Ganeshprasad Pavaskar (51). History of pressure vessel codes. Boiler explosion on March 20, 1905 in Brockton, Massachusetts. 58 killed and 117 injured.

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CODES FOR VESSELS/HEAT EXCHANGERS

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  1. CODES FOR VESSELS/HEAT EXCHANGERS AvinashNayak. (46) ShrikantkumarPadhy (47) JitendraPatil (48) ManojPatil (49) GaneshprasadPavaskar (51)

  2. History of pressure vessel codes • Boiler explosion on March 20, 1905 in Brockton, Massachusetts. • 58 killed and 117 injured. • Need of legislative rules and regulation for construction of boilers. • The first Boiler and Pressure Vessel Code was published in 1915. • Necessary changes made and new sections added as need arose.

  3. What is a Code? • A code is a standard that has been adopted by one or more governmental bodies and has the force of law, or when it has been incorporated into a business contract. • Codes specify requirements of design, fabrication, inspection and testing of pressure vessels. • Number of national codes have been developed for pressure vessels by different countries. • In India, the code for pressure vessels is IS-2825

  4. WHAT ARE ASME CODES? • It is a standard that provides rules for the design, fabrication, and inspection of boilers and pressure. • This establishes and maintains design, construction and inspection standards providing for maximum protection of life and property.

  5. ASME Codes - Manufacturer • A manufacturer obtains permission to use one of the stamps through the ASME conformity assessment process. • The manufacturer’s quality control system is reviewed by an ASME team. • If it meets ASME requirements and the manufacturer successfully demonstrates implementation of the program, the manufacturer is accredited by ASME. • The manufacturer then may certify the product as meeting ASME standards and apply the stamp to the product.

  6. Why follow ASME codes? • Excessive elastic deformation including elastic instability • Excessive plastic deformation • Brittle fracture • Stress rupture or creep deformation (inelastic) • Plastic instability and incremental collapse • High strain and low cycle fatigue • Stress corrosion • Corrosion fatigue

  7. ASME Codes - User • ASME Publications Catalog, • The ANSI Catalog of American National Standards, • the US government’s OSHA General Industry Standards, • contact a standards organization directly. • http://www.asme.org/catalog

  8. ASME Codes – User • Insurance • Replacement • Proper Compliance • Size specific • Jurisdiction • Proper ASME stamps

  9. The organization of the ASME Boiler and Pressure Vessel Code is as follows: 1. Section I: Power Boilers 2. Section II: Material Specification: i. Ferrous Material Specifications – Part A ii. Non-ferrous Material Specifications – Part B iii. Specifications for Welding Rods, Electrodes, and Filler Metals – Part C iv. Properties – Part D 3. Section III Subsection NCA: General Requirements for Division 1 and Division 2 i. Section III Division 1: a. Subsection NA: General Requirements b. Subsection NB: Class 1 Components

  10. Subsection NC: Class 2 Components d. Subsection ND: Class 3 Components e. Subsection NE: Class MC Components f. Subsection NF: Component Supports g. Subsection NG: Core Support Structures h. Appendices: Code Case N-47 Class 1: Components in Elevated Temperature Service • Section III, Division 2: Codes for Concrete Reactor Vessel and Containment • Section IV: Rules for Construction of Heating Boilers • Section V: Nondestructive Examinations

  11. Section VI: Recommended Rules for the Care and Operation of Heating Boilers • Section VII: Recommended Guidelines for Care of Power Boilers • Section VIII i. Division 1: Pressure Vessels – Rules for Construction ii. Division 2: Pressure Vessels – Alternative Rules • Section IX: Welding and Brazing Qualifications • Section X: Fiberglass-Reinforced Plastic Pressure Vessels • Section XI: Rules for In-Service Inspection of Nuclear Power Plant Components

  12. Stamps

  13. Nomenclature

  14. Example • A heat exchanger qualifies as a UM stamped pressure vessel if: • Design pressure < 15psig • Internal volume < 1.5 cubic ft. for 150<P<600 psig • Internal volume < 5 cubic ft. for design P upto 250 psig

  15. Example • A heat exchanger qualifies as a U stamped pressure vessel if: • Design pressure > 600 psig • Internal volume > 1.5 cubic ft. for 150<P<600 psig • Internal volume > 5 cubic ft. for design P upto 250 psig

  16. Comparison of pressure vessels

  17. Comparison of pressure vessels

  18. Comparion of pressure vessels

  19. Explosions

  20. In spite of some of the most rigorous, well-conceived safety rules and procedures ever put together, boiler and pressure vessel accidents continue to occur. • In 1980, for example, the National Board of Boiler and Pressure Vessel Inspectors reported: • 1972 boiler and pressure vessel accidents, 108 injuries and 22 deaths. • The pressure vessel explosions are of course rare nowadays and are often caused by incorrect operation or poorly monitored corrosion.

  21. Safety in boiler and pressure vessels can be achieved by: • Proper design and construction • Proper maintenance and inspection • Proper operator performance and vessel operation

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