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Surge Tanks/Balance Tanks

Surge/ Balance Tanks

With Surge Capacity

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 ensures 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.

Swimming Pool Balance or Collector tank are terms 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.

Until the advent of fiberglass swimming pool surge or balance tanks, these tanks were made of plain carbon steel, which is easily corroded by the intense chlorine-rich fumes in the top of the tank, above the operating water level. Corrosive failure occurred at the normal water level in the tank.

Currently, the preponderance of these tanks is that they are constructed of fiberglass which is not damaged by the chlorine fumes. When using fiberglass there are construction considerations that differ from metal, mainly due to the fact that fiberglass is not as strong under vacuum. Several conditions can occur in the normal swimming pool operation which can create a vacuum in the tank:

1) Small-steel tanks are usually supplied with a 2” (too small) vent whereas fiberglass vents are much larger.

2) Rapid pump out-if the pump pulls more water out than can be supplied by gravity flow into the tank, an immediate vacuum will be created.

Mer-Made Filter reviews all surge tank inquiries with respect to possible vacuum creation and advises the customer if any design changes are required. 

Custom sizes and custom piping configurations are available in either cylindrical or rectangular shapes.

All Mer-Made filter Systems are certified by NSF international and ANSI/NSF standard 50 for pool and spa applications.

  • Fiberglass surge tanks are superior to any other material because it is extremely corrosion resistant.Surge tanks are generally required on gutter pools to allow a “storage” space for water displaced 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 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 schematics below show the general arrangement of various type surge systems. The surge tank can be a built in place concrete vault or a closed top tank, vented to a point above pool water level. It is also common to find vacuum D.E. filter components installed in a field constructed concrete tank which also acts as a surge tank. The volume of water that can be stored in the space between the normal water level in the surge tank and the pool water level is the surge capacity of the tank.

    To receive cad drawings, quotes or additional product information please contact us.

  • I.D. 30″ 36″ 42″ 48″ 54″ 60″ 66″ 72″
    O.D 31 1/4″ 37 1/4″ 43 1/4″ 49 1/4″ 55 1/4″ 61 1/4″ 67 1/4″ 73 1/4″
    Weight (Lbs.) 308# 349# 397# 426# 484# 545# 590# 630#
    Height 87″ 88 1/4″ 89 1/4″ 92″ 95″ 95 1/2″ 101″ 102″
    “H” Dim 20″ 20″ 20″ 22″ 24″ 24 1/4″ 26″ 28″
    Support Ring 24 1/2″ 30 1/2″ 36 1/2″ 42 3/4″ 48 3/4″ 54 3/4″ 60 3/4″ 60 3/4″
    Total Gallons 202 297 412 547 705 885 1091 1320
    Surge Cap. 95 142 214 272 353 428 590 721
  • ImageTitleFile TypeFile SizeDownloadDateCategoriesProducts1234_hfilter

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MER-MADE FILTER, INC.
11746 Charleston~Augusta Road
P.O. Box 306
Denmark, SC 29042
sales@mermade.com

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