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Low Pressure Test
Low Pressure Test
MK I Testing Device
MK I Testing Device
Hourleey Water presssure Regulator Valve
Hourleey Water presssure Regulator Valve
The varying low pressure test was conducted under dynamic conditions, meaning that the end of hose was left open and weight was stacked on top of the MK I testing clamp until the flow was nearly completely stopped. The length of hose used for this test was 20ft, considerably shorter than a typical 100ft wildland hose. Using the regulator valve in the figure above, pressure was varied from 10psi to 50psi by increments of 10psi. For each psi interval weights were stacked on the MK I and recorded. The results of the test are summarized in the table below.
The results of the table are shown in the plot to the right. The red line depicts a linear fit line through the data.
The force required to clamp a hose at different pressures with a dynamic flow.
Linear scaling to find out the force required to clamp a hose at higher pressures.
Expanding the linear fit allowed for predictions of the amount of force needed to clamp a wildland hose at high pressures. For example, the graph on the left estimates that the force required to clamp an 1-1/2in. hose charged to 300psi would require 1400 lbs to stop the flow.
High Pressure Test
High Pressure Test
MK II Testing Device
MK II Testing Device
Station 21 Rig
Station 21 Rig
The high pressure test was conducted at CAL Fire Station 21. This test was conducted under static conditions with the valve at the end of two sticks or 200ft of hose using the MK II testing device. The pressure of the hose was varied using the station truck with a range from 50psi to 300psi. The pressure was measured at increments of 50psi.
The force required to clamp a hose at different pressures with a static flow.
The results of the table are shown in the plot to the left. The red line depicts a linear fit line through the data.
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