What is K factor in pipe fittings?
Pipe fittings, valves and bends usually have some associated K factor or local loss coefficient, which allows the calculation of the pressure loss through the fitting for a particular fluid flowing at a specified velocity.
What is loss coefficient k?
Loss coefficient, abbrevated as K, a dimensionless number, measures the minor loss to the change in velocity due to friction thru pipes, fittings, and valves. Any bend or tee, expansion or contraction, valve opening or partially closing can cause minor or even major losses.
What is K in head loss?
The resistance coefficient K can be thought of as the number of velocity head loss caused by a valve or fitting. The value of K is constant when the flow is in the zone of complete turbulence.
How do you calculate loss coefficient k?
The head loss coefficient (K) is calculated as the ratio of the manometric head difference between the input and output of the fitting to the velocity head.
What is K in pipe flow?
The K-value, Resistance Coefficient, Velocity Head, Excess Head or Crane method allows the user to characterise the pressure loss through fittings in a a pipe. The K-value represents the multiple of velocity heads that will be lost by fluid passing through the fitting.
What is loss coefficient K for pipe fittings?
Approximate Loss Coefficients, K for Commercial Pipe Fittings ….
| Type and position of fittings | Values of K |
|---|---|
| Pump foot valve | 1.5 |
| 90°elbow(threaded) | 0.9 |
| 45°elbow(threaded) | 0.4 |
| Side outlet of T junction | 1.8 |
What is the correct value for K for pipe bend?
An additional loss of head takes place in the course of flow through pipe fittings like valves, couplings and so on. In-general, more restricted the passage is, greater is the loss of head….
| Type and position of fittings | Values of K |
|---|---|
| 90°elbow(threaded) | 0.9 |
| 45°elbow(threaded) | 0.4 |
| Side outlet of T junction | 1.8 |
What is K value PVC?
K value (viscosity), is an empirical parameter closely related to intrinsic viscosity, often defined in slightly different ways in different industries to express viscosity based estimate of statistical molecular mass of polymeric material used particularly for PVC.
What is K in relative volatility?
= the vapor–liquid equilibrium concentration of component in the liquid phase. = Henry’s law constant (also called the K value or vapor-liquid distribution ratio) of a component. When their liquid concentrations are equal, more volatile components have higher vapor pressures than less volatile components.
How to calculate k factor for piping fittings?
K factor or K value for different piping fittings accounts for the additional frictional losses contributed by these fittings and valves. K value is then used to calculate the ‘equivalent length’ of fittings. Using K value to calculate frictional losses in a piping system Equivalent length, L eq = K × (D/4f)
How does K factor relate to pressure loss?
But when different piping fittings and valves are also included in the pipe run, they modify the flow itself and that also contributes to the overall pressure loss. K factor or K value for different piping fittings accounts for the additional frictional losses contributed by these fittings and valves.
What is the k value of a reducer?
If the K factor is directly multiplied by (ρv 2 /g), that directly gives the additional pressure drop across corresponding fittings. For quick calculation of equivalent length and frictional losses across a pipe run, approximate K value for reducers and expander joints can be considered to be 0.5.
How is the pressure loss of a fitting calculated?
Sometimes the pressure loss of a fitting is expressed as an ‘Equivalent length’ of pipe, where by the engineer calculates a further length of pipe that will produce an extra friction loss in the pipe that is equivalent to the loss through the fitting.