1. 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 2
Sonani Tejas B. 42

2. 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. 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

6. 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

7. 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.

8. 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

9. 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

10. 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

11. 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.

12. 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

13. 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

14. THANK YOU