Atmiya Institute of Technology & Science ASME Pressure Vessels Design Codes. ASME VIII DIV 2 and IS 2825 SR NO. NAME ROLL NO. ER NO. 1 Dhanani Meet Y. 66 140033119007 2 Sonani Tejas B. 42 130030119603

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

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.

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

ASME VIII DIV 2 Introduction To remain technically competitive, and to facilitate incorporation of new technology and future updates, ASME is developing a new pressure vessel code. This code will replace the existing Section VIII, Division 2 Code, the first release will be July, 2007. The new code is being developed primarily to address design and fabrication of engineer edpressure vessels and will result in significant cost savings for many vessels

Development Objectives Structure/Organize Section VIII considering the following: Division 1 –Basic Pressure Vessels (Maintenance/Enhancements) Division 2 –Engineered Pressure Vessels (New Code) Division 3 –High Pressure Vessels (Maintenance/Enhancements) Optimize code rules to balance technology, user-friendliness, and jurisdictional acceptance Develop a new organization and introduce a clear and consistent writing style to facilitate use Separate administrative and technical requirements. Develop rules to facilitate computer implementation. Incorporate PED and other international requirements. Incorporate US Customary and Metric units.

Organization The table of contents for the new code incorporates a modular flat structure to facilitate modifications and enhancements –Part 1 –General Requirements –Part 2 –Responsibilities and Duties –Part 3 –Materials Requirements –Part 4 –Design By Rule Requirements –Part 5 –Design By Analysis Requirements –Part 6 –Fabrication Requirements –Part 7 –Examination and Inspection Requirements –Part 8 –Pressure Testing Requirements –Part 9 –Pressure Vessel Overpressure Protection Technical information traditionally placed in Mandatory and Non-Mandatory Appendices at the back of the existing Code will be re-deployed as Annex’s to Parts in the new Code with a similar topic

Comparison ASME Section VIII, Div 2: 2006 vs. 2007 New allowable stress basis will typically result in higher allowable stresses and lower wall thickness, extent of wall thickness reduction is a function of the YS/TS ratio at the design temperature Increase in allowable stress and resulting Wall Thickness Reduction (WTR) may be significant for many materials, indicator is the MYS/MTS ratio Consider the following comparison: –Design pressure: 1000 psig –Inside diameter: 60 inches –Weld joint efficiency: 1.0

Material MTS MYS Temp S-2006 tcyl-2006 S-2007 tcyl-2007 WRT (ksi) (°F)   (ksi) (°F) (in) (%) SA516 Gr. 70 70 38 100 23.3 1.316 25.3 1.210 8 300 22.4 1.370 SA537 CL1, <= 2.5" 50 29.2 1.045 21 21.9 1.402 29 1.053 25 SA537 CL2, <= 2.5" 80 60 26.7 1.145 33.3 0.915 20 26 1.176 22 SA737 GR. B 27.6 1.107 16 SA737 GR. C 33.1 0.920 SA387 GR. 22 CL1 30 1.538 850 17.1 1.807 SA387 GR. 22 CL2 75 45 1.224 1.017 17 SA832 GR. 22V 28.3 1.079 35.4 0.860 24.5 1.250 28.9 1.056

COMPARISON OF PRESSURE VESSELS DESIGNED UNDER THE STANDARD CODES Item IS-2825 ASME Code Section VIII BS-5500 AD-Merkblatter Scope Unfired fusion welded pressure vessels Pressure < 20 N/mm2 Do/Di < 1.5 Di > 150 mm Water capacity > 50 litres Welded, riveted, forged and brazed vessels Water capacity>120 gal Operating pressure > 15 psi Di>6” Medium and high pressure storage vessels Excludes transportable vessels. Do/Di < 1.7 Vessels and vessel parts predominantly under static load. materials Carbon and low alloy steels, high alloy steel, Cu and Cu alloys, Al and alloys, bolting and casting alloys Same as IS-2825 Cast iron, lined material cast iron, ferritic steel Composite Materials Carbon, ferritic alloy(low and high) and austenitic steels All metallic materials and graphite, glass.

Item IS-2825 ASME Code Section VIII BS-5500 AD-Merkblatter Design pressure Maximum working pressure including static head + 5% maximum working pressure. Maximum pressure at most severe conditions Based on permissible service pressure Design tempera-ture Highest metal temperature expected under operating conditions Actual metal temperature expected under operating conditions Actual metal temperature expected under operating conditions + margin for uncertainties Highest temperature expected under working conditions

COMPARISON OF PRESSURE VESSELS DESIGNED UNDER THE STANDARD CODES Tensile Strength (N/m2 ) Yield strength Sr(rupture stress) Creep stress ASME: VIII Div-1 4 1.6 - 1 Div-2 3 1.5 BS-1515 Part II 2.5 BS-5500 2.35 1.3 ANCC IS-2825

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