Questions regarding the installation of exhaust vents on gasoline tanks at gas stations
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The design that is commonly seen is as shown in the figure below: This is hard to understand – wouldn’t setting up a flame arrestor vent simply meet the regulatory requirements? Why is it set this way? The setup of the two valves is even more incomprehensible. Has anyone done gas station design? I’d like some advice.
It is recommended to first understand the functions of these two devices before making any modifications. Assuming that this gasoline tank requires purging before hot work, can the breathing valve serve as a substitute for this purpose? The words “normally open” and “normally closed” on the valve are not clear; if these are indeed the words written there, please understand them carefully for reference.
When considering a replacement, switch to using it!
Nominalmente, this is to ensure that the vent valve does not interfere with refueling while in operation. In fact, to make unloading at the gas station faster: during unloading, the station can privately close the vapor recovery system using these two valves and release the fuel vapors directly into the atmosphere. In some areas, environmental protection agencies no longer allow the installation of “backup pipelines”.
Nominalmente, this is to ensure that refueling is not affected during the replacement of the breather valve. Typed a wrong word
Another consideration is the exhaust capacity of the storage tank; if one unit with a very large capacity is not suitable, then two units should be chosen.