PRESSURE VESSEL CONCEPTS 



Exploratory Evaluation of Stacked-Ring 

 and Segmented-Wali Designs With Tie-Rod 

 End-Closure Restraints 



Technical Report R-666 



Y-R009-03-01-004 



by 



J. D. Stachiw 



ABSTRACT 



An exploratory experimental study was conducted to evaluate the 

 stacked-ring and segmented-wall pressure vessel concepts. The evaluation 

 consisted of (1) testing to destruction stacked-ring and segmented-wall pres- 

 sure vessel models with tie-rod end-closure restraints and (2) evaluating a 

 series of seal designs utilized in the sealing of the joints between the pressure 

 vessel end closures and the cylindrical pressure vessel body. The test results 

 indicate that the stacked-ring pressure vessel design is approximately 50% 

 heavier than a multilayered pressure vessel of same internal diameter, length, 

 material, and pressure capability. The segmented-wall pressure vessel design 

 is approximately 8 to 9 times heavier than a multilayered pressure vessel of 

 same diameter, length, material, and pressure capability. The free-floating, 

 self-energizing radial seal system provided the most reliable and extrusion- 

 proof sealing for vessels with considerable radial dilation and axial end-closure 

 movement. 



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Each transmittal of this document outside the agencies of the U. S. Government 

 must have prior approval of the Naval Civil Engineering Laboratory. 



