• Study Material

    Cooling Tower Terminology

    Cooling Tower Terminology Approach – difference between cold water temperature and the measured wet-bulb temperature. Bleed Off – is the circulating water in the tower which is discharged to waste to help keep the dissolved solids concentration of the water below a maximum allowable limit. As a result of evaporation, dissolved solids concentration will continually increase unless reduced by bleed off. Blowdown – water intentionally discharged from the cooling system to control concentrations of salts and other impurities in the circulating water British Thermal Unit (BTU) – the heat energy required to raise the temperature of one pound of water one degree Fahrenheit in the range from 32° F to 212° F…

  • Study Material

    Boiler Heating Surface

    This is the formula used to calculate the heating surface of a power plant boiler: An HRT boiler is 5 ft in diameter and 16 ft long. It contains 60 tubes of 3 inch outside diameter and 2.732 inch inside diameter. Find the boiler-heating surface. Take the inner surface of tubes, half of the shell surface, and two-thirds of the tube plate area, less the area of the tube holes.   Circumference of shell = 5 * 3.14 = 15.700 ft Half circumference of shell = 15,700 * ½  = 7.850 ft Area of half of shell = 7.850 * 16 = 125.60 sq. ft   Inner circumference of fire…

  • Adventures

    Boiler 1 In Flames

    One evening while doing plant rounds I noticed something odd out of the corner of my eye. Flames coming out of the top of the front burner plate of boiler #1! My training and experience kicked in and the first thing I did was run to the plant office and get my camera. I had heard of this happening and had seen pictures of it but never in person. After the photo shoot I secured boiler 1 and had boiler 3 online. What an adventure!