Question 1. Calculate the total head loss for water (25°C) flowing at 100 m3/hr as shown in the following figure. The total flow length is 250 meters and the pipe is 15-cm diameter cast iron pipe. Assume the water enters the pipe through an abrupt (sharp edged) opening, the two gate valves are wide open, the check valve is a swing type and is fully open, the bends are 90 elbows, and flow exits the pipe to a reservoir. Loss coefficients for transitions and fittings may be found in the resources noted in last week's lecture.
Question 2. A basket strainer is installed in a 15-cm diameter pipe. Pressure gauges are installed immediately upstream and downstream of the basket strainer. When water flows at 100 m3/hr, the pressure gauge immediately upstream of the basket strainer measures 1 bar.
a. When the basket strainer is clean, the pressure immediately downstream measures 0.9 bar. Calculate the local loss coefficient of the clean basket strainer.
b. When the pressure drops across the basket strainer by half (i.e., to 0.5 bar after the strainer) at the 100 m3/hr flow rate, it is removed for cleaning. What is the local loss coefficient of the basket strainer at this point?