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Damping Effect-Cryogenic Tanks

IP.com Disclosure Number: IPCOM000182683D
Publication Date: 2009-May-05

Publishing Venue

The IP.com Prior Art Database

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     DAMPING EFFECT OF PERLITE/FIBERGLASS INSULATION
ON OUTER TANK DYNAMIC LOADS IN DOUBLE-WALLED CRYOGENIC TANKS

     A. S. Adorjan, Ph.D. Senior Research Specialist
Exxon Production Research Co.

Houston, Texas, U.S.A.

D. B. Crawford, B.S. ChE.

Manager, Process Development
The M.W. Kellogg Company

Houston, Texas, U.S.A.

S. E. Handman, MME

    Chief Engineer
The M. \,r. Kellogg Company

Houston, Texas, U.S.A.

ABSTRACT

     The dynamic load on the concrete outer wall of a cryogenic storage tank can be significantly higher than the hydrostatic pressure of the stored material if the inner steel tank should fail suddenly. Experimental work by Cuperus (1,2) on a scale model double-walled tank without insulation in the annular space showed that the dynamic
load is highly asymmetric and that it may be higher than
the hydraulic head by a factor of six in case of a brittle failure. A previous paper by the present authors (3) showed, by use of a simplified analytical model, that the insulation and gas contained in the annular space between the two tanks could significantly reduce this dynamic load.

     This paper examines many of the simplifying assumptions of the previous paper and concludes that during the time period of interest, the insulation system would respond as if it were locally confined between the inner tank and the outer retaining wall, and that the assumptions are justified. Fur- ther: calculations using this simplified analytical method predict dynamic loads in the range of those determined experi- mentally by Cuperus for the case with no insulation in the annular space.

(LNG 7 - 1983 - Jakarta)

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Page 2 of 15

L'EFFET DE L'ISOLATION PERLITE/FIBERGLASS SUR L'AMORTISSEMENT DES CHARGES DYNAMIQUES DU

/ / ,

RESERVOIR EXTERIEUR DANS LES RESERVOIRS

CRYOGENIQUES A DOUBLE PAROl

RESUME

     La charge dynamique exercee sur la paroi exterieure en beton d'un bac de stockage de produits cryogeniques peut
etre considerablement plus grande que la pression hydrostati- que du materiau stocke en cas de panne subite du reservoir interieur en acier. D'apres les experiences realisees par Cuperus (1,2), sur une maquette de bac a double paroi sans isolant a l'interieur de l'espace annulaire, les resultats obtenus indiquaient que la charge dynamique est fortement asymetrique et qu'elle risque de depasser la charge hydro- statique, a raison d'un coefficient 6, en cas de panne due

a la rupture. Un document presente precedemment par les

auteurs du present (3) demontrait, a l'aide d'une maquette

analytique simplifiee, que Ie fait de poser un isolant et de separer Ie gaz a l'interieur de l'espace annulaire entre les deux reservoirs, pouvait reduire considerablement cette charge dynamique.

     Le present document a pour objet d'examiner les nom- breuses hypotheses de simplification du document precedent et aboutit a l...