Environmental Science & Engineering Magazine (ESEMAG) November 2005

Page 29

a warm environment for the valves. By keeping the valves inside and warm, the owner saves on the cost of thawing valves if required, as well as standby costs for truckers that encounter frozen valves.

ure.

The use of a Vault negates the necessity of entering the area at all. The large doors facilitate the access to

all internals without having to physi

The same method of heat transfer

ic heater, or an electric heater rated for

be trapped inside a building. The use of a Vault also provides the advantage of keeping all the valves at ground level, thus eliminating the need to

quality prior to opening the Vault, or a

climb ladders to access valves.

Spill containment

fixed ambient detector can be installed inside. Even ifthere were to be an inci

With more focus on environmental

dent, the operator would fall away

continued overleaf...

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the area classification. This allows the

operator to provide an adequate amount of heat to prevent the contents from freezing, while at the same time providing heat for any appurtenances that may be installed inside the Vault. Many times the operator is looking to just provide freeze proofing for the contents. The options to accomplish this are very limited and many of them are ineffectual. Tube tracing is expen

from the tank into fresh air, rather than

cally enter the hazardous area. If required, a portable gas detector with a probe can be used to check the air

Keep your tank's contents from freezing

ence, namely the Vault being surround ed by fluid, can be used to transfer heat into the fluid. This is accomplished by the use of the afore-mentioned catalyt

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sive and transfers little heat. Internal

coils require much maintenance, are

very expensive, and necessitate entry into a confined space. The use of a firetube burner assembly is also expensive, requires tanks' modifica tion, and is a high maintenance item. It also releases a large amount of "Greenhouse" gases, something to consider in these days of the Kyoto Accord. The use of a Vault is relatively inexpensive and provides many addi tional advantages. Safety for personnel Safety is a major concern for all operators. Confined space entry is one issue that should be avoided at all

costs. Some manufacturers provide an insulated "shack" that is affixed to the

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side of the tank. This provides an area to house the valves, etc. The use of this

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November 2005 \ 29


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