Pipe Flow Wizard - Pipe Fittings
The type and quantity of various valves and fittings
associated with the pipe can be set by amending the
values on the 'Pipe fittings' screen.
Click the 'Valve' button to display the 'Pipe fittings' screen.
Enter the quantity of bends, fittings, valves etc. in the
appropriate input boxes, click 'OK' to return to the
The total quantity of fittings will be displayed on the 'Valve'
button, on the appropriate calculation screen.
If the fitting type required is not displayed an appropriate
entry in the other 'K' factor input box can be used to
include the pressure drop of the fitting in the calculation.
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Where two or more of these fittings are required the 'K'
factor for each fitting should be added together and the
total 'K' value should be entered.
When a 'Find diameter' calculation is carried out, it may be
necessary to first estimate the pipe diameter to allow the
'K' factor to be established (perform the calculation without
the 'K' factor data to estimate the pipe diameter).
Generally the effect of pipe fittings are considered as
The pressure loss of a fitting (m hd or ft.hd) is calculated
using the 'K' factor as shown here where:
hd loss = v^2 / 2g
v = fluid velocity (m/s or ft/s)
g = 9.806 m/s^2 or 32.174 ft/s^2
On occasion the pressure loss of a fitting is expressed as
an 'Equivalent length' of pipe.
Pipe Flow Wizard does not allow the use of equivalent
length of pipe.
The 'K' factor of a fitting may be calculated from the
'Equivalent length' (Eq.) (in m or ft.) if the friction factor (ff)
and the Internal diameter (i.d.) (in m or ft.) is known.
The 'Equivalent length' and 'Internal diameter' must be in
the same units to calculate the 'K' factor.
K = (Eq. * ff) / i.d.