TIGG manufactures pressure vessels and steel tanks that meet ASME Code

2. Pressure Vessels – Non Code
• Pressure test – build a vessel with whatever steel is
available and pressure test to a certain pressure for
rating.
• Use pressure formula to calculate thickness.
– Little or no factor of safety
– No efficiency factors for welding
• Made to code without stamp
– Complete code testing with paperwork but no
stamp
– Calculations and pressure test no paperwork, no
x-ray, etc.

3. Pressure Vessels – Non Code TIGG
• TIGG Corporation uses ASME code
calculations to verify steel thickness
on all standard liquid phase
equipment.
• Use ASME Certified welders to
complete vessels.
• Use ASME certified steel SA-516-70

4. Pressure Vessels – ASME Code
History
• Boiler explosions were common in
the 1800’s to early 1900’s
• By early 1900’s thousands were
killed across the United States.
• Commonwealth of Mass. Enacted
the first set of rules.
• 1911, ASME Recognized the need
for uniform rules regarding design
Keene, NH Boiler Explosion
and build of pressure vessels.
May 22, 1898

5. ASME Codes & Standards
• Section I – Power Boilers
• Section II – Materials
– Part A; Part B; Part C; Part D
• Section III – Rules for Constr. of Nuclear Power Plant Components
– Div. 1 – 5
• Section IV – Heating boilers
• Section V – Nondestructive Examination
• Section VI – Recommended rules for Care and Operation of Heating
Boilers
• Section VII – Recommended guidelines for Care of Power Boilers
• Section VIII – Pressure Vessels
– Div 1; Div 2; Div 3
• Section IX – Welding and Brazing Qualifications
• Section X – FRP Pressure vessels
• Section XI – Rules for In-service Inspection of Nuclear Power Plant
components
• Section XII – Rules for Construction and continued Service of transport
Tanks
• Code Cases

6. ASME Code – Section VIII Div 1

7. ASME Code – Section VIII Div. 1
Common Heads

8. ASME Code – Section VIII Div. 1
• Materials of Construction
– SA516-70 70,000 psi tensil
• tough
– SA36 58,000 psi tensil
• Not so tough
– SA240 – 304 SS depends on temperature
• Tough

9. ASME Section VIII Div. 1
• 2:1 elliptical head thickness calculation
• t= PDoK/2SE+2P(K-0.1)
• t = thickness
• P = Pressure rating
• Do = Outside diameter
• K = Constant
• S = Allowable stress value
• E = efficiency factor
• Shell thickness calculation
• t = PRo/SE+0.4P

10. ASME Section VIII Div. 1
• Other factors for design consideration
– Structural components
• Wind
• Seismic
– Nozzle loadings
– Corrosion allowances

11. Questions?
Bill Bland
724-703-3020 X107
bbland@tigg.com
www.TIGGtanks.com