simplification of how to read ASME VIII code

1. Simplify
ASME Code
Alex Inspectors

2. 2
 A S M E

3. 3
 The American Society of Mechanical
Engineers set up a committee in 1911 for the
purpose of formulating standard rules for the
construction of steam boilers & other
pressure vessels.
 This committee is now called the Boiler &
Pressure Vessel Committee.

4. 4
XI.Rules for inservice
Inspection of nuclear power
Plant components
X. Fiber-Reinforced
Plastic PV
IX. Welding &
Brazing Qualf.
VIII. Rules for
Constn.
Of
Pressure vessels VII. Rec.
Guidelines
for the
Care of
Power
boilers
VI. Rec.
Rules for
Care & Opn.
Of heating
boilers
V. NDE
IV.Rules for cont.
of heating boilers
III.Nuclear plants
II. Materials
Part A:Ferrous
Part B:Non Ferrous
Part C:Welding electrodes
Part D: Properties
I. Rules for
Const. of
Power boilers
ASME
BOILER &
PRESSURE
VESSEL
CODE

5. 5
ASME BOILER &
PRESSURE
VESSEL CODE
SECTION VIII

6. 6
 WORLDWIDE,THERE ARE VARIOUS
PRESSURE VESSELS FABRICATION
CODES IN USE
 THE EARLIEST CODE USED WAS
BS 5500, WHICH IS A BRITISH CODE
AND IS STILL IN USE
 ASME CODE IS THE WIDELY
USED CODE TODAY

7. 7
 THE ASME SECTION VIII IS USED FOR
THE CONSTRUCTION OF NEW UNFIRED
PRESSURE VESSELS.
 IT HAS THREE DIVISIONS:
 DIVISION 1(S8/1)
 DIVISION 2(S8/2)
 DIVISION 3(S8/3)
 SOME IMPORTANT POINTS FOR EACH
DIVISION ARE GIVEN IN THE
FOLLOWING SLIDES.

8. 8
 DIVISION 1 : RULES FOR
CONSTRUCTION OF PRESSURE VESSELS
 DIVISION 2 : ALTERNATIVE RULES FOR
CONSTRUCTION OF PRESSURE VESSELS
 DIVISION 3 : ALTERNATIVE RULES FOR
CONTRUCTION OF HIGH PRESSURE
VESSELS

9. 9
 S8/1 (DESIGN & TEST CRITERIA)
 Pressure = 3000 psi (MAX.)
 Temperature = No limitation
 Factor of safety = 3.5
 Hydro test = 1.3 x Design pressure
 Pneumatic test = 1.1 x Design pressure
 Operating cycles = 100 – 10 6
 Radiography = Spot TO 100%
 STATIC & MOBILE VESSELS
PERMITTED
Note the change,
Earlier 1.5
Note the change,
Earlier 1.25

10. 10
 S8/2 (DESIGN & TEST CRITERIA)
 Pressure = No limitation
 Temperature = No limitation
 Factor of safety = 3
 Hydro test = 1.25 x Design pressure
 Pneumatic test = 1.15 x Design pressure
 Operating cycles = 100 – 10 6
 NDT = 100%
 Fatigue analysis required
 Proximity analysis of nozzles required
 ONLY STATIC.NO MOBILE VESSELS
PERMITTED

11. 11
HOW TO USE THE CODE S8/1
 DIVISION 1 CONSISTS OF THREE
SUBSECTIONS
 SUBSECTION A
 SUBSECTION B
 SUBSECTION C

12. 12
 SUBSECTION A:
GENERAL REQUIREMENTS
(PART-UG)
THIS SECTION COVERS THE SCOPE OF
THE CODE & GENERAL REQUIREMENTS
FOR ALL METHODS OF CONTRUCTION
& ALL MATERIALS

13. 13
 SUBSECTION B:
REQUIREMENTS PERTAINING TO METHODS OF
FABRICATION OF PRESSURE VESSELS
THIS SUBSECTION CONSISTS OF THREE
PARTS:
 PART UW : WELDING
 PART UF : FORGING
 PART UB : BRAZING

14. 14
 SUBSECTION C:
REQUIREMENTS PERTAINING TO
CLASSES OF MATERIALS
THIS SUBSECTION HAS 9 PARTS WHICH
ARE AS FOLLOWS:

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 PART UCS : CARBON & LOW ALLOY STEELS
 PART UNF : NON FERROUS MATERIALS
 PART UHA : HIGH ALLOY STEEL
 PART UCI : CAST IRON
 PART UCL : CLADDING
 PART UCD : CAST DUCTILE IRON
 PART UHT : HEAT TREATMENT
 PART ULW : LAYERED CONSTRUCTION
 PART ULT : LOW TEMPERATURE

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SECTION VIII (DIVISION I)
SUBSECTION A
SUBSECTION B SUBSECTION C
Part UG Part
UW
UF
UB
Part
UCS
UNF
UHA
UCI
UCL
UCD
UHT
ULW
ULT

17. 17
 REMAINING PART OF THE CODE
CONTAINS:
 TABLES (For types & grades of CS,NF etc.)
 MANDATORY APPENDICES
 NONMANDATORY APPENDICES

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 THERE ARE 31 MANDATORY APPENDICES IN ASME
SECTION VIII DIVISION 1
 APPENDICES CONCERNING/RELATED TO NDT ARE:
 APPENDIX 4 (RADIOGRAPHY EXAMINATION)
 APPENDIX 6 (MAGNETIC PARTICLE EXAMINATION)
 APPENDIX 8 (LIQUID PENETRANT EXAMINATION)
 APPENDIX 12 (ULTRASONIC EXAMINATION)
THESE APPENDICES ALSO GIVES THE ACCEPTANCE
CRITERIA

19. 19
 CLAUSES IMPORTANT FOR
INSPECTION & TESTING IN PART-UG
OF SUBSECTION A
ARE:
 UG-93 : Inspection Of Materials
 UG-99 : Hydrostatic Test
 UG-100 : Pneumatic Test
 UG-102 : Test Gages
 UG-103 : NDT

20. 20
 CLAUSES IMPORTANT FOR
INSPECTION & TESTING IN PART-UW
OF SUBSECTION B
ARE:
 UW-47 : Welding Procedure
 UW-48 : Welder & Welding Operator
Qualification
 UW-49 : Post Weld Heat Treatment

21. 21
 Please Note The Pressure Vessel Code
Section-VIII Is Not Complete In Itself.
It Asks Us To Refer :
 Section – IX (Welding & Brazing Qualifications)
&
 Section – V (Non Destructive Examination)

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