pressure group, as diameter increases, the maximum possible cage diameter increases.
Also evident is that as pressure increases, the slope of the constant pressure trends
becomes steeper. This indicates that for a given diameter, operating at higher pressures
increases the maximum possible cage size.
Since the flow situations are idealized and true water conditions vary no matter
how the cage is anchored, choosing the material for the largest cage is based on the
results of both flow cases. Figure 5.15 presents the data from figures 5.13 and 5.14 as a
summary of the top-flow and side-flow maximum cage diameters possible for all the
material models tested. The lesser cage maximum diameter of the two flow cases is the
limiting factor for each material. Refer to Table 5.1 for model specific manufacturer data
including tube diameter, thickness, and working pressure for each case.
45
40
35
30
slight pressure effect
E
E
E 15 70-80 psi
m 40-50 psi
2 10 30-35 psi
5
0
0 2 4 6 8 10 12 14 16 18
Tube Diameter (in)
Figure 5.13 Top-flow maximum cage diameters for each tubing material grouped by
internal pressure