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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.