Marley / Sigma F Series CoolingTower / Specifications: Options | 21 |
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and a solid state circuit board for tem- perature control and low water cutoff. A control probe shall be located in the basin to monitor water level and tem- perature. The system shall be capable of maintaining 40°F water temperature at an ambient air temperature of ____
°F. Wiring of the heaters and the heat- er components shall be the responsibil- ity of the purchaser.
Convenience and Safety Options
Fiberglass Stairway:
9.3Replace paragraph 9.3 with the following: One endwall of the tower shall be equipped with a structural fiberglass stairway rising from grade (roof) to the fan deck. Treads, stringers and risers shall be molded integrally for strength and stiffness. Stairs shall be 41.5°, 30" (762 mm) wide, with 8" (203
mm)rise and 9" (229 mm) run. Treads shall have a nonskid surface. Landings shall occur at
Wood Stairway:
9.3Replace paragraph 9.3 with the fol- lowing: A 30" (762 mm) wide, column supported, 45° stairway with 8" rise and run of treated Douglas Fir shall be provided at the tower endwall ris- ing from grade (roof) to the fan deck. Stair columns shall be nominal 4"x4". Guardrails shall be nominal 2"x4". The upper guardrail shall have an eased edge for the protection of operating personnel. Stairway foundation shall be by others, designed in accordance with drawings provided by the cooling tower manufacturer. The stairway shall conform to OSHA standards.
■Although they are not necessary for routine operation and main- tenance, stairways do provide a safe and comfortable means of access to the top of the tower that is often overlooked in the ini- tial cooling tower purchase. And fiberglass construction provides long term service and stability. It also is architecturally compat- ible with the basic tower construction and appearance.
■Where atmospheric conditions at the jobsite are not aggressive, the treated wood stairway may be chosen because of its lower cost.
