SPX Cooling Technologies 1000, 1200 Specifications, Specification Value, Fire Safety Options

Marley / Sigma 1000/1200 CoolingTower / Specifications: Options

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Specifications

Watertight Partitions Between Cells:

3.5Replace the last sentence in this paragraph with the following: Partitions shall be 3/4" x 5-ply, factory- fabricated, grooved and splined treated Douglas Fir plywood sheets, installed and sealed watertight to permit inde- pendent cell operation.

Fire Safety Options:

Specification Value

■In addition to the normal partition function of preventing air bypass (page 17), this option allows you to use each partitioned cell of your tower independently. This is valuable where a single multicell tower is serving several separate systems—or where winter operation may require less than full tower capability.

■Occasionally, critical processes or local codes may require you to install a fire-protection sprinkler system on a wood tower—or pay higher insurance premiums—or both. Our first recommendation in such a case would be for you to consider using a Sigma Steel cooling tower, as listed in the Factory Mutual Approval Guide.

Another alternative that could be acceptable to your insurance carrier, and which you may wish to evaluate, would be to make your Sigma tower as fire resistant as possible. This can be done by any or all of the following measures:

•FRP casing having a flame spread rating of 25 or less. (Para. 8.1)

•Fan cylinders of fire-retardant FRP having a flame spread rating of 25 or less. (Para. 4.2)

•1⁄4" thick fireproof fiber reinforced cement overlay over the fan deck—and will provide FRC overlaid distribution basin covers. (Para. 4.1)

•3⁄4" thick plywood partitions both sides of the column line between cells to achieve a fire rating of at least 30 minutes. (Para. 3.5 and this page.)