SPX Cooling Technologies SS-NC-08A Inlet Flow Control Valves, Equalizer Flume Weir Gates

Marley / NC Class Stainless CoolingTower / Specifications: Options 19

Specifications

Inlet Flow Control Valves:

8.2: Add the following to the end of the paragraph: Heavy-dutyflow-regulator valves shall be provided at the hot water inlet connections. These valves shall be disc-type, with cast iron bodies and stainless steel operating stems. There shall be a locking handle to maintain the valve setting in any position. Valves shall be right-angle configuration, precluding the need for inlet elbows.

Equalizer Flume Weir Gates:

11.2: Add the following paragraph under Cold Water Collection Basin: The interconnecting flume between cells shall be equipped with a removable cover plate to permit the shutdown of one cell for maintenance purposes, or to permit independent cell operation.

Sound Control

1.2Add the following paragraph under Base: The cooling tower shall be quiet operation, and shall produce an overall level of sound not higher than _______

dB(A) measured at _______ m from the locations in the table below. All low noise options and combinations shall be CTI Certified for thermal perfor- mance.

Location	63	125	250	500	1000
Discharge
Air Inlet
Cased Face
Location	2000	4000	8000	Overall dB(A)
Discharge
Air Inlet
Cased Face

Inlet Sound Attenuation

1.3Add the following paragraph under Base: The cooling tower shall be equipped with inlet sound attenuation baffles positioned and spaced verti- cally. The baffles will be spaced across the entire length and extend the full height of the air inlet. The baffles will be constructed of perforated sheet metal and contained within a steel

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Specification Value

■Marley flow-control valves have been a favorite of users since the 1950s. They remain serviceable for the life of the tower and provide a continuing means of flow- regulation between hot water basins—and between cells of multicell towers as well.

■Where it is your intention to be able to operate both cells of the tower while the flume cover plate is installed, separate outlet connections, float valves and overflows must be provided for each cell. Likewise, this would require separate sensors and controls for basin heater systems, if installed.

■Sound produced by a standard NC Cooling Tower operating in an unobstructed environ- ment will meet all but the most restrictive noise limitations—and will react favorably to natural attenuation. Where the cooling tower has been sized to operate within an

enclosure, the enclosure itself will have a damping effect on sound. Sound also declines with distance—by about 5 or 6 dB(A) each time the distance doubles. Where noise at a critical point is likely to exceed an acceptable limit, you have several options—listed below in ascending order of cost impact:

•Where only a slight reduction in noise will satisfy—and the source of concern is in a particular direction—merely turning the cooling tower may be the answer. Less sound emanates from the cased face of the cooling tower than does from the air intake face.

•In many cases, noise concerns are limited to nighttime, when ambi- ent noise levels are lower and neighbors are trying to sleep. You can usually resolve these situations by using two-speed motors—operating the fans at reduced speed without cycling “after hours”.The natural nighttime reduction in wet-bulb temperature makes this a very feasible solution in most areas of the world, but the need to avoid cycling may cause the cold water temperature to vary significantly.

•A Marley Variable Speed Drive automatically minimize the tower’s noise level during periods of reduced load and/or reduced ambient