Setting Wildland Pump Pressure | Setting Municipal Pump Pressure

Pump Discharge Pressure definition:

Pump Discharge Pressure is the pressure you set your pump at to compensate for pressure lost due to change in elevation and friction loss.

In order to determine Pump Discharge Pressure, there are many interdependent steps. A mistake made on any one step will result in an incorrect answer. We have developed a system of breaking down each step to find the correct pump pressure.

Setting Wildland Pump Discharge Pressure
Setting Municipal Pump Discharge Pressure

Summary of how to Set Pump Pressure:

Determining Pump Discharge Pressure (PDP) starts out by finding the GPM usage of every open nozzel in the hose lay. Based on those GPM numbers, you work your way back from each open nozzel to the pump and determine the GPM being used in every section of hose in the hose lay. You then look up the PSI friction loss for each section of hose on a friction loss calculator, friction loss slide rule, friction loss chart, or use the friction loss formula. Then find the nozzel that has the greatest friction loss by adding up all the PSI friction loss for each section of hose on a direct path between the nozzel and the pump. This is the nozzel you base your Pump Discharge Pressure calculations on.

Start with the specified PSI for this nozzel, add the sum of all friction loss in a direct line of each hose between the pump and this nozzel. By adding these two numbers (nozzel pressure to the friction loss) you have the pump discharge pressure for a hoselay on level ground. Add the PSI gain or loss to calculate PDP for a hoselay with a change of elevation.

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