In this form the law approximates the " Darcy friction factor ", the " energy ( head ) loss factor ", " friction loss factor " or " Darcy ( friction ) factor " in the laminar flow at very low velocities in cylindrical tube.
42.
Other factors effecting the possible lift and total length of the suction hose are that single stage vacuum pumps only reach a 85-90 % partial vacuum and that small air leakages, pipe friction losses and the viscosity of the liquid further reduce the possible lift.
43.
In effect, the friction loss in the laminar regime is more accurately characterized as being proportional to flow velocity, rather than proportional to the square of that velocity : one could regard the Darcy Weisbach equation as not truly applicable in the laminar flow regime.
44.
The friction loss is customarily given as pressure loss for a given duct length, ? " p " / " L ", in units of ( US ) inches of water for 100 feet or ( SI ) kg / m 2 / s 2.
45.
A well or bore with an operating level of 5 metres below the intake, minus a 2 metre friction loss into pump ( pipe loss ), minus the NPSHR curve ( say 2.4 metres ) of the pre-designed pump = an NPSHA ( available ) of ( negative )-9.4 metres.
46.
Additionally, traffic regulations in a large number of countries require trucks to always drive with an engaged gear, which in turn provides a certain amount of engine braking ( viscous losses to the engine oil and air pumped through the engine and friction losses to the cylinder walls and bearings ) when no accelerator pedal is applied.
47.
A well or bore running at 70 degrees Celsius ( 158F ) with an operating level of 5 metres below the intake, minus a 2 metre friction loss into pump ( pipe loss ), minus the NPSHR curve ( say 2.4 metres ) of the pre-designed pump, minus a temperature loss of 3 metres / 10 feet = an NPSHA ( available ) of ( negative )-12.4 metres.
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