SPX Cooling Technologies 1200, 1000 Specifications, Specification Value, 3.0Construction, wood

Marley / Sigma 1000/1200 CoolingTower / Specifications: Base

Specifications Specification Value

3.0Construction:

16

3.1	The tower shall be capable of with-	■The limiting water quality values indicated are those which are
	standing water having a pH of 6.5 to	acceptable for the normal materials of construction specified. If
	8.0; a chloride content (NaCl) up to 750	water of more aggressive quality is anticipated please change
	ppm; a sulfate content (SO4 ) up to	hardware material requirement to 300 Series stainless steel, as
	1200 ppm; a sodium bicarbonate con-	indicated below and following.
	tent (NaHCO3) up to 200 ppm; a cal-
	cium content (CaCO3) up to 800 ppm;
	silica (SiO2) up to 150 ppm; and design
	hot water temperatures up to 120°F.
	The circulating water will contain no
	oil, grease, fatty acids, or organic sol-
	vents.

3.2The structural framework of the tower shall be Douglas Fir, designed in accor- dance with CTI STD-114. Nylon shear plates shall be utilized to transmit loads at critical joints, and all fasteners shall be in accordance with CTI STD-119. Basic design criteria shall be 30 psf wind load and 5%g seismic load.

3.3All wood components shall be treated

	after fabrication with chromated cop-	Cooling Technology Institute standards take into account the hot,
	per arsenate (CCA) by the full-cell	humid environment in which a cooling tower normally operates.
	process to a chemical retention of 0.4	This environment can render the limits of customary construction
	lbs/ft3.	standards inadequate for cooling tower design.
3.4	Structural columns and diagonals shall	The importance of shear plates is discussed at length in
	be 4"x4". Framing girts may be 2"x4",	Marley Difference, “Item S-3”. Ask your Marley representative for
	except for those supporting the hot	a copy.
	water basins and fill. Those girts shall	See notes on page 27 regarding the use and availability of red-
	be 2"x6" minimum, located both sides
	of the support columns.	wood.
3.5	Multicell towers shall include treated	Specification of minimum member sizes assures that all offerings
	Douglas Fir plywood partitions	will conform to an industrial level of construction.
	between cells in the plenum area.	Multicell towers must have plenum partitions between cells.
	Partitions shall extend the full height of
	the tower from the base of fill to the	Otherwise, air will be induced downward through an inoperative
	underneath side of the fan deck.	fan, bypassing the fill entirely. Without these partitions, part-load
		or off-season operation of the tower would be completely unsat-
3.6	Column lines shall be on no greater	isfactory.
	than 4'-0" longitudinal centers, and
	the base of all perimeter columns
	shall be firmly anchored to galvanized
	steel base plates. Framing joints shall
	be made with 1/2" diameter or larger
	series 300 stainless steel machine
	bolts, nuts and washers.