CE 3372 WATER SYSTEMS DESIGN LECTURE 9 FITTING
- Slides: 14
CE 3372 WATER SYSTEMS DESIGN LECTURE 9: FITTING LOSSES
OUTLINE • Fitting Losses • • Darcy-Weisbach Structure Equivalent Length
FITTING (MINOR) LOSSES • Fittings, joints, elbows, inlets, outlets cause additional head loss. • Called “minor” loss not because of magnitude, but because they occur over short distances. • Typical loss model is
FITTING (MINOR) LOSSES • The loss coefficients are tabulated for different kinds of fittings
EXAMPLE – FITTING (MINOR) LOSSES
PIPELINE SYSTEM Length_2 2 Length_1 Exit Elbow =Length_1 + Length_2 1 Inlet Head Loss Model Pump Curve
EXAMPLE • Consider the tworeservoir problem with fitting losses • • • Inlet loss: K=0. 5 Exit loss: K=1. 0 Assume two 45 elbows; K = 0. 4
EXAMPLE • Apply the On-Line Calculator • • • Inlet loss: K=0. 5 Exit loss: K=1. 0 Assume two 45 elbows; K = 0. 4
WATER PROPERTIES • Apply the On-Line Calculator • • • Inlet loss: K=0. 5 Exit loss: K=1. 0 Assume two 45 elbows; K = 0. 4
EXAMPLE • Apply the On-Line Calculator • • • Inlet loss: K=0. 5 Exit loss: K=1. 0 Assume two 45 elbows; K = 0. 4 Set Z 1 and Z 2 so difference is 20 feet
EXAMPLE • Apply the On-Line Calculator • • • Inlet loss: K=0. 5 Exit loss: K=1. 0 Assume two 45 elbows; K = 0. 4
CHECK WORK – REPEAT WITH ) LOSS COEFFICIENTS; COMPARE TO JAIN EQUATION • Obtain nearly the same result, so the case with the loss is is plausible
PIPELINE SYSTEM WITH PUMP Length_2 2 Length_1 Exit Elbow =Length_1 + Length_2 1 Inlet Head Loss Model Pump Curve
NEXT TIME • Pumps and Pump Performance Curves • • Pump Types Pump Curves System Curves Parallel and Series Pumps
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