Engineering Applications in Permafrost Areas 545 Preservation of permafrost for a fuel storage tank
.The w e history is presented of the successful installation of an insulated and ventilated foundation pad for a two million gallon (9100 m3) fuel storage tank in Inuvik, N.W.T. Because the tank is only heated locally in the winter at the fuel pick-up point near the tank bottom, the tank temperature...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.599.5426 http://pubs.aina.ucalgary.ca/cpc/cpc4-545.pdf |
| Summary: | .The w e history is presented of the successful installation of an insulated and ventilated foundation pad for a two million gallon (9100 m3) fuel storage tank in Inuvik, N.W.T. Because the tank is only heated locally in the winter at the fuel pick-up point near the tank bottom, the tank temperature is rela-tively low, ranging from 12 to 39°F (-1 1 to 4’C), with an average of 24°F (-4.4”C). The foundation design employs no forced-air ventilation system, thus saving the related energy cost for operating such a system. Instead, the winter ventilation is accomplished by a wind draft. During the winter months, the average rate of heat removal through the culverts per unit of tank area is cal-culated to be about 2.4 Btu/hr.ftZ (7.6 W/m2). This rate of heat removal is sufficient to freeze back the foundation pad in the winter and to allow the pad to absorb heat from the tank and the ambient air in the summer. Although the foundation pad undergoes annual freeze-thaw cycles, the lower insula-tion layer dampens the temperature variation in the subsoil and prevents it from thawing. Le present document relate le cas de I’installation d’une dalle de fondation calorifugte et ventilke pour un reservoir de stockage de combustible de 9100 m3 a Inuvik (T.N.-0.). Puisque le reservoir n’est chauffe en hiver qu’au point de prise de combustible, pres du fond du reservoir, sa temperature est relativement basse, variant entre-1 1 et 4”C, avec une moyenne de-4.4”C. La ventilation de la fondation n’est pas assurk par un systtme a air pulse, ce qui permet d’eviter les coats inherents a I’utilisation d’un tel systtme. La ventilation d’hiver est plutdt assurke par le vent. Pendant I’hiver, les conduits permettent d’enlever la chaleur a un t a w moyen d’environ 7.6 W/m2de surface de reservoir. Ce t a w d’enlkement de chaleur est suffisant pour geler la dalle de fondation en hiver et pour lui permettre d’absorber la chaleur du reservoir et de I’air ambiant en ete. Bien que la dalle de fondation subisse les cycles annuels de gel et de dkgel, ... |
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