This K factor should be used along with the pressure drop calculator to account for total frictional losses in a piping system. This K factor when multiplied by ‘?v 2 /2’ of a stream, gives the effective pressure drop across all the fittings.
Valves and fittings pressure drop coefficient K, Valves and fittings pressure drop coefficient K, Pipe Flow Expert Sprinkler K Factors, Valves and fittings pressure drop coefficient K, 49 rows · 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.
The pressure drop through common fittings and valves found in fluid piping can be calculated thanks to a friction coefficient K. This coefficient must be determined for every fitting. In pre-project, common values are often sufficient. Usual coefficients are given in the tables below.
The application presented here can be used to calculate the overall K factor based on the fittings in a piping segment. This K factor should be used along with the pressure drop calculator to account for total frictional losses in a piping system. Enter the piping details: Pipe Nominal diameter 0.50.7511.251.522.5345681012141618202224262830323436384042444648 …
For a given pressure drop across the sprinkler component, the flow rate is determined using a sprinkler K value of 5.6. The following are pressure drop / flow rate data points for such a sprinkler: 1.0 psi drop gives ?(1.0) x 5.6 = 5.6 US gpm flow 4.0 psi drop gives ?(4.0) x 5.6 = 11.2 US gpm flow, Pipe Fittings Loss Calculations with K Factors 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.
The local pressure losses corresponding by the valves and fittings in the hydraulic networks are expressed by the following relation: Dps = local pressure loss in Pa; p = density of the fluid in kg/m3; V = rate of flow in m/s; K = coefficient depend on the nature of local resistance = Dynamic pressure .
A K v value is defined as the rate of flow of water in m 3 /hr and 4°C at a pressure drop of 1 bar across the equipment. K v relates to pressure drop and flow rate via the following expression: Where Q is in m 3 /hr and ?P is in bar.
Calculation of K value using the 3K Method. The 3K method is an extension of the 2K method and therefore the Excess Head ( K method). As such the 3K method requires the 3K coefficients to be converted into a K value before the fitting pressure drop may be calculated. Formula for Calculating the K Value from the 3K Method, K , values were compared with theoretical predictions at filtration velocity ranging from 1 to 9 cmlsec. FUNDAMENTAL THEORY OF K2 When there is a significant particle mass loaded on a filter, total pressure drop across the filter can be expressed as the sum of the pressure drop .
There are two components to the pressure loss/gain through an area change, the permanent pressure loss and the change due to acceleration. As the name suggests the permanent pressure loss is not recoverable, and like the pressure loss through ordinary fittings such as a pipe elbow, it is lost to friction, eddies, and noise.
