Minor Loss Coefficients in Pipes and Tubes Components
Minor loss coefficients for common used components in pipe and tube systems
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Minor head loss in pipe and tube systems can be expressed as
hminor_loss = ξ v2/ 2 g (1)
where
hminor_loss = minor head loss (m, ft)
v = flow velocity (m/s, ft/s)
g = acceleration of gravity (m/s2, ft/s2)
Minor loss coefficients for some of the most common used components in pipe and tube systems
| Type of Component or Fitting | Minor Loss Coefficient - ξ - |
| Flanged Tees, Line Flow | 0.2 |
| Threaded Tees, Line Flow | 0.9 |
| Flanged Tees, Branched Flow | 1.0 |
| Threaded Tees, Branch Flow | 2.0 |
| Threaded Union | 0.08 |
| Flanged Regular 90o Elbows | 0.3 |
| Threaded Regular 90o Elbows | 1.5 |
| Threaded Regular 45o Elbows | 0.4 |
| Flanged Long Radius 90o Elbows | 0.2 |
| Threaded Long Radius 90o Elbows | 0.7 |
| Flanged Long Radius 45o Elbows | 0.2 |
| Flanged 180o Return Bends | 0.2 |
| Threaded 180o Return Bends | 1.5 |
| Fully Open Globe Valve | 10 |
| Fully Open Angle Valve | 2 |
| Fully Open Gate Valve | 0.15 |
| 1/4 Closed Gate Valve | 0.26 |
| 1/2 Closed Gate Valve | 2.1 |
| 3/4 Closed Gate Valve | 17 |
| Forward Flow Swing Check Valve | 2 |
| Fully Open Ball Valve | 0.05 |
| 1/3 Closed Ball Valve | 5.5 |
| 2/3 Closed Ball Valve | 200 |
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