Cooling Tower Fan Blade Angle Measurement

Blades set at a 20 degree angle meet too much resistance which may cause the motor to burn out.

Cooling tower fan blade angle measurement.

The method is easy tools required in this videos to measure and adjust the pitch angle of the cooling tower fan blades ar. From 0 139 to 0 510 ipspk at one measurement point used for. Blades that are set at a lower angle will slice the air but not create proper air circulation. B t 260 and above.

The cooling tower blades move large volumes of air quietly and efficiently. No overall vibration level standards are offered by cti. By saum hadi posted on february 16 2020. Let s look at a typical case of fan selection for a new tower design.

Generally the pitch angle of a cooling tower turbine is very from 6 degree to 15 degree depending on the operational speed and discharge. Frequencies present at cooling towers. Finally it was found that the cooling tower can operate under all the given approaches 5 c 6 c 7 c and 8 c at the blade angle of 67 by maintaining the cooling range of 5 c wet bulb temperature of 26 c and water flow rate of 3 9 m3 h. This paper is a brief case history of how cracked blades on a cooling tower fan were detected and a fan failure likely avoided by the use of vibration analysis.

Vibration sensors were properly installed on the gearbox driving the fan and the vibration levels routinely monitored. Houston texas fans key to optimum cooling tower design nomograph gives the reciprocal of the density ratio. How to adjust it. Duty requirements are 1 1 million actual cfm 0 477 in.

If the tower has a fixed pitch fan reduce the fan speed by adjusting the sheave ratio. Considered will be a 26 ft 28ft or 30 ft diameter fan. A t 25 t 250. Try either a smaller motor sheave or larger fan sheave.

The vibration levels at both motor fan speed are to be measured at the motor while the vibration levels at the blade pass frequency is to be measured at the fan shroud or stack. Fan speed motor speed blade pass frequency. First of all technically it is called the pitch angle of a turbine blade. For a ceiling fan to move the correct amount of air and achieve good circulation you should set the blades at a 14 degree angle.

Blade angles performance of a small cooling tower. Made of reinforced plastic material the blades are coupled to the fan hub by bolts and glue. Cooling tower fan blade angle measurement. What is cooling tower fan blade angle quora.

Reduce fan blade pitch by 1 5 degrees and re measure.