Page 76 - Fluid Power Engineering

Hydraulic Oils and Theor etical Backgr ound 53

16. Calculate the pressure at the inlet of a pump of 60 L/min discharge if the
hydraulic tank is open and the suction line has a 1 m length and a 15 mm diameter,
given: oil kinematic viscosity ν= 0.2 cm /s and oil density ρ= 900 kg/m . 3
2

17. Calculate the pressure losses in the given pipe line if

3
Flow rate Q = 10 L/min, oil density ρ= 850 kg/m , L = L = 4 m, D = 13 mm,
1
2
1
D = 8 mm, fluid kinematic viscosity ν= 20 cSt.
2

18. Calculate the shift of the piston in the given system if the force F is
increased by 100 kN if

Piston area A = .0176 m 2 Pipe wall thickness h = 1 mm
p
Pipe line diameter Pipe length L = 5 m
d = 13 mm Cylinder wall thickness t = 6 mm
Fluid bulk modulus Material bulk modulus
B = 1.4 GPa E = 210 GPa
Initial piston
displacement x = 0.5 m
o

2.7 Nomenclature
A = Line cross-sectional area, m 2
a = constant, m/s
A = Piston area, m 2
P
A = Piston rod-side area, m 2
r