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.

Pressure Vessels – Non Code TIGG

• Use ASME Certified welders to complete vessels.

• Use ASME certified steel SA-516-70

• TIGG Corporation uses ASME code calculations to verify steel thickness on all standard liquid phase equipment.

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 and build of pressure vessels.

Pressure Vessels – ASME Code

Keene, NH Boiler ExplosionMay 22, 1898

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

ASME Code – Section VIII Div 1

ASME Code – Section VIII Div. 1Common Heads

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 SSdepends on temperature• Tough

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

ASME Section VIII Div. 1

• Other factors for design consideration– Structural components• Wind• Seismic

– Nozzle loadings– Corrosion allowances

Questions?Bill Bland724-703-3020 X107bbland@tigg.com

www.TIGGtanks.com