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32<br />
LP-<strong>Gas</strong> Regulators<br />
Underground Installations<br />
In underground installations the vent tube opening must be above<br />
the maximum water table and kept free from water, insects, and<br />
foreign material. NOTE: if the water mark in the dome of an<br />
underground tank is above the regulator vent tube end or regulator<br />
vent opening, the regulator should be replaced and the situation<br />
corrected.<br />
Grade ground downward and<br />
away around housing dome.<br />
This prevents water collecting<br />
and running into or standing<br />
around dome.<br />
Regulator adjustment closure<br />
cap must be tight.<br />
6 inches minimum<br />
(24 inches minimum if<br />
subject to vehicular traffic).<br />
End of regulator vent tube<br />
located at top inside of<br />
housing dome cover.<br />
2 to 6 inches<br />
minimum.<br />
Reading a Regulator Performance Chart<br />
Refer to the capacity chart for the size and type regulator which fits<br />
your particular application. Check the performance of this regulator<br />
with your actual load at the inlet pressure corresponding to your<br />
lowest winter temperatures (as shown on Page 3).<br />
Example for a Two Stage System<br />
Selecting the First Stage Regulator<br />
1. Assume a load of 500,000 BTUs per hour<br />
2. Assume a minimum delivery pressure of 9.5 psig.
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