1. Large Steel Seamless Pressure Vessels
CPI
Large Steel Seamless Pressure Vessels
Kevin Collins
National Center of Manufacturing Sciences
March 9, 2005
Dearborn, MI

2. Overview
CP Industries manufactures large seamless pressure vessels for the storage of gases under high pressure.
Pioneered the development of high pressure cylinders.
ASME
DOT
Military
ISO

3. Applications Transportation of Industrial Gases
Ground Storage of Industrial Gases
Compressed Natural Gas Fueling Stations
Mother - Daughter Projects

4. Tube Trailer

5. Applications Transportation of Industrial Gases
Ground Storage of Industrial Gases
Compressed Natural Gas Fueling Stations
Mother - Daughter Projects

6. Ground Storage

7. Applications Transportation of Industrial Gases
Ground Storage of Industrial Gases
Compressed Natural Gas Fueling Stations
Mother - Daughter Projects

8. ISO Container

9. Manufacturing Process
Raw Material is Seamless Pipe
End Domes are Hot Forged Spun or Hammered
Heat Treated - Liquid Quench & Temper
Grit Blast and Condition O.D.
Machine Necks with I.D. and O.D. Threads
Grit Blast and Condition I.D.
Vacuum, Steam Clean & Dry I.D.
Install End Plugs
Solvent Wash and Paint
Purge with Dry Nitrogen
Assemble

10. Quality and Inspection Process
All Pipe is Ultrasonic Tested
Properties are Tested from Test Ring
Yield Tensile Elongation Charpy V Notch
Brinell Hardness Tests
O.D. is Magnetic Particle Inspected
Machined Threads are Dye Penetrant Tested
Hydrostatic Test
Final Ultrasonic Inspection
Assemblies are Air Tested
Inspections and Testing Witnessed by Independent Agencies

11. Specifications
Design specification is contingent on what gas is used and how it is used.
Hydrogen - Ground
ASME UPV Code Section VIII Div 1 Newest Version Current Addenda and Appendix 22
Material - ASME SA 372 Grade J Class 70
Hydrogen - Transported DOT - 3AAX (Pressure)
Material - AISI 4130X

12. Concerns Hydrogen is Difficult to Store Efficiently
Requires Higher Pressures than Other Gases
Higher Pressure Results in Smaller O.D.’s and Thicker Walls
More Difficult to Attain Required Properties

13. Solutions CPI working with ASME and Compressed Gas Association
Working Committees have Been Formed to Address Hydrogen Storage
Research Laboratories such as Sandia National Laboratories are Testing Materials

14. Hydrogen Storage