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TECHNICAL PAPERS

Redesign of NEMO-Type Spherical Acrylic Submersible for Manned Operation to 3000 ft (914 m) Ocean Depth

[+] Author and Article Information
Partha S. Das

Harbor Branch Oceanographic Institution Inc., Fort Pierce, FL 34946e-mail: dasps100@hotmail.com

J. Pressure Vessel Technol 124(1), 97-107 (Aug 02, 2001) (11 pages) doi:10.1115/1.1428746 History: Received July 07, 2000; Revised August 02, 2001
Copyright © 2002 by ASME
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References

Stachiw,  J. D., 1971, “Spherical Acrylic Pressure Hulls for Undersea Exploration,” Paper No. 70-WA/UnT-3, ASME J. Eng. Ind., 53.
Stachiw, J. D., 1971, “Acrylic Pressure Hull for Submersible NEMO,” ASME Paper No. 71-Unt-2.
Stachiw,  J. D., 1976, “NEMO Type Acrylic Plastic Spherical Hull for Manned Operation to 3000 ft Depth,” Paper No. 75-WA/OcE-3, ASME J. Eng. Ind., 8pp. 537–549.
Snoey, M. R., and Katona, M. G., 1971, “Structural Analysis of a Full Scale. Acrylic Plastic Pressure Hull,” Naval Civil Engineering Laboratory, Technical Note R-176.
Snoey, M. R., and Katona, M. G., 1970, “Stress Analysis of a Spherical Acrylic Pressure Hull,” ASME Paper No. 70-UnT-B.
Stachiw,  J. D., and Dolan,  R. B., 1978, “Spherical Acrylic Pressure Hulls with Multiple Penetrations,” ASME J. Eng. Ind., 100.
Stachiw,  J. D., Clark,  A., and Brenn,  C. B., 1987, “Acrylic Plastic Spherical Pressure Hull for 2439 m (8000 ft) Design Depth: Phase I,” ASME J. Energy Resour. Technol., 109, pp. 40–47.
Das, P. S., 1996, “A Parametric Investigation on the Structural Analysis of the Interface Between Metallic Penetrations and the Acrylic Hull of a Spherical Pressure Vessel,” ASME PVP-Vol. 331, Pressure Vessels and Piping Design, Analysis, and Severe Accidents, American Society of Mechanical Engineers, New York, NY.
ANSYS 5.4 User’s Manuals, 1997, Sept.
Das, P. S., 1999, “Detailed Stress Analysis of a Spherical Acrylic Submersible by 3-D Finite Element Modeling,” ASME PVP-Vol. 398, Recent Advances in Solids and Structures, American Society of Mechanical Engineers, pp. 153–165.
Stachiw, J. D., Acrylic Plastic Viewports—Ocean Engineering and Other Hyperbaric Applications, sponsored by Marine Technology Society, ed., N. T. Monney.
Cook, R. D., and Young, W. C., 1985, Advanced Mechanics of Materials, Macmillan Publishing Company, New York, NY.
Das, P. S., 2000, “Redesign of Johnson-Sea-Link Acrylic Submersible for Manned Operation to 3000 ft (914.4 m) Ocean Depth,” Final Report, HBOI Project No. CM006.1.
Das, P. S., 2000, “Redesign of Spherical Acrylic Submersible for Manned Operation to 3000 ft (914.4 m) Ocean Depth,” ASME PVP-Vol. 415, Recent Advances in Solids and Structures, American Society of Mechanical Engineers, pp. 145–161.
Safety Standard for Pressure Vessels for Human Occupancy, ASME PVHO-1-1990 Edition.
Ramon, J. I., and Jones, M., 2000, “Hydrostatic Pressure Tests on a Manned Submersible Acrylic Spherical Hull for a Johnson-Sea-Link II Submersible,” Final Report, Southwest Research Institute Project No. 18.03184.
Measurements Group Tech Note TN-515, “Strain Gage Rosettes—Selection, Application and Data Reduction.”

Figures

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A sectional view of HBOI’s acrylic spherical submersible
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A discretized FEA model for HBOI’s acrylic submersible with external loading and boundary conditions, including material properties
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Radial, hoop, and longitudinal stress distributions through the wall of HBOI’s acrylic submersible at Y=0, including Lamé solution for 3000 ft (914 m) depth
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Distribution of different stresses at acrylic/nylon interface through the wall of the HBOI’s acrylic submersible at 3000 ft (914 m) depth—(a) normal, principal, and equivalent stresses, (b) shear stress
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Variation of radial displacement of acrylic hull and nylon gasket at the acrylic/nylon interface and of the nylon gasket and aluminum hatch ring at the gasket/hatch ring interface through the wall of HBOI’s acrylic submersible for 3000 ft (914 m) depth
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Variation of maximum S3 in acrylic at the acrylic/nylon interface with different gasket thickness and shape
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Sectional view of HBOI’s acrylic submersible with various parameters for design of hatch/hatch ring
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Variation in shape of nylon hatch/hatch ring for acrylic submersible—(a) plane nylon hatch, (b) curved nylon hatch
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Sectional view of HBOI’s bottom of acrylic submersible with different parameters for plug design
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(a) Distribution of different stresses (normal, principal, and equivalent) at acrylic/nylon interface through the wall of the new acrylic submersible for 3000 ft (914 m) depth. (b) Variation of radial displacement of acrylic hull and nylon gasket at the acrylic/nylon interface and of the nylon gasket and aluminum hatch ring at the gasket/hatch ring interface through the wall of the new acrylic submersible for 3000 ft (914.4 m) depth.
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A sectional view of HBOI’s new acrylic submersible
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Strain gage locations in HBOI’s new acrylic submersible—(a) top hatch assembly, (b) acrylic sphere, (c) bottom plug assembly
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Variation of strains (longitudinal and hoop) through the acrylic sphere at inside surface at operational depth of 3000 ft (914 m)
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Normalized relative radial displacements of top nylon gasket and acrylic sphere with respect to aluminum hatch assembly during proof tests—(a) first test, (b) second test

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