Table 5-2.—Tubing Size Designation
contamination. Therefore in maintenance and
PREPARATION OF PIPES
repair of fluid power system lines, the basic design
AND TUBING
requirements must be kept in mind. Two primary
requirements are as follows:
1. The lines must have the correct ID to
provide the required volume and velocity of flow
with the least amount of turbulence during all
demands on the system.
2. The lines must be made of the proper
material and have the wall thickness to provide
sufficient strength to both contain the fluid at the
required pressure and withstand the surges of
pressure that may develop in the system.
Fluid power systems are designed as compactly
as possible, to keep the connecting lines short.
Every section of line should be anchored securely
in one or more places so that neither the weight
of the line nor the effects of vibration are carried
on the joints. The aim is to minimize stress
throughout the system.
Lines should normally be kept as short and
free of bends as possible. However, tubing should
not be assembled in a straight line, because a bend
tends to eliminate strain by absorbing vibration
and also compensates for thermal expansion and
5-3
