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Title: Blasting And Its Effect On Liquified Natural Gas Tanks
Author: Claude Dore
Source: American Gas Association 1992
Year Published: 1992
Abstract: In July 1990, a contractor working on behalf of the City of Montreal requested permission to use dynamite in order to install a new water and sewer system nearby our L.N.G. Plant. Permission was granted after we reviewed the charges of dynamite the contractor intended to use. Our main concern was to protect a distribution line located a few meters away from the work site. A few days after the first dynamite blast (July 19), drops in temperature were observed at the base of tank L SOB. This drop continued for several days. We initiated the following operations to check the foundation heating system: We checked the electric signal between the thermocouple and the control panel but the result was negative. We checked the thermocouple itself but it was in good condition. We checked the conductivity of the heating cables. Again, negative. Finally, we took additionnal temperature measurements using a rigid thermocouple to determine the temperature profile across the tank bottom. This revealed a lower temperature at the perimeter of the tank. To minimize the possible and potential damages, we stopped hquefaction and turned up the heating system to its maximum. Finally, on Friday July 26, we decided to empty the tank for inspection. (Faithful to Murphys law: the tank had to be emptied during the last weekend of July which is historically the period of lowest gas consumption in our network).

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