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Surge Tanks/Balance Tanks Surge tanks are generally required on gutter pools to allow a “storage” space (surge capacity) for water displace by swimmers. The preferred arrangement is to hold-back (modulate) the water from the main drain pipe so that water entering the gutters can flow to the surge tank and not back-up in the pool. This is done with a float ball control on a butterfly type modulating valve, mounted on the main drain line. Modulating the main drain line insures that the debris that normally accumulates on the surface of the pool will be swept quickly to the filters. The surge tank is a closed top tank and must be vented to a point above pool water level.
A swimming pool surge tank capacity is defined as the volume of the portion of the tank that is above the centerline of the main drain line. Surge capacity is usually dictated by health department codes. One gallon per square foot of pool surface area is a common requirement. Pool balance tank is a term used to describe smaller tanks that accept water from the main drain and gutter lines with an exit connection to the pump suction. Swimming pool balance tanks are usually not big enough to meet any surge capacity code requirement. |
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