Pumping in Volume and and Pressure are the two modes offered on a dual stage pump in order to optimize flow from your engine. At lower volumes, pumping in pressure is more efficient. Yet, once you begin to reach 1/2 the rated capacity of your pump, the engine’s pump will become more efficient in volume. Most often people want to know when to switch to Volume, since Pressure is the default… here are a couple: 1. You are flowing greater than 1/2 your rated capacity (see new video I just posted on this). Big fire = big water = volume. 2. You have a “hot plug” and your intake pressure from that hydrant is causing your baseline discharge pressure to be higher than your first lines PDP. Switching to volume is a trick you can use instead of gating your initial handline down. This happens a lot on our Pierce Engines in Dallas that run SB nozzles that require lower pressures. 3. You know you’re going to relay pump. Initial volume might not meet #1 criteria, but I would anticipate larger flows and make that transition early rather than later. Just a couple times I would in an urban environment.
Are most engine/quint pumps single stage or dual stage? Sorry if that seems like a basic question. Up on the pump panel is selecting pressure or gpm different from doing it from a labeled transfer valve like shown in the thumbnail of this video? I was recently told our pumps are single state, but I thought they were dual since up on the panel we could select pressure or rpm - or is that just for the governor? Thanks so much love the channel!
Thank you for the videos. Going through driver op, pumper, and aerial. It says you have videos that are hidden. Do Those videos have good info?
Can you give me scenarios as to when you would pump in pressure as to when you would pump in volume? Great video series, great information!
Pumping in Volume and and Pressure are the two modes offered on a dual stage pump in order to optimize flow from your engine. At lower volumes, pumping in pressure is more efficient. Yet, once you begin to reach 1/2 the rated capacity of your pump, the engine’s pump will become more efficient in volume.
Most often people want to know when to switch to Volume, since Pressure is the default… here are a couple:
1. You are flowing greater than 1/2 your rated capacity (see new video I just posted on this). Big fire = big water = volume.
2. You have a “hot plug” and your intake pressure from that hydrant is causing your baseline discharge pressure to be higher than your first lines PDP. Switching to volume is a trick you can use instead of gating your initial handline down. This happens a lot on our Pierce Engines in Dallas that run SB nozzles that require lower pressures.
3. You know you’re going to relay pump. Initial volume might not meet #1 criteria, but I would anticipate larger flows and make that transition early rather than later.
Just a couple times I would in an urban environment.
Are most engine/quint pumps single stage or dual stage? Sorry if that seems like a basic question. Up on the pump panel is selecting pressure or gpm different from doing it from a labeled transfer valve like shown in the thumbnail of this video? I was recently told our pumps are single state, but I thought they were dual since up on the panel we could select pressure or rpm - or is that just for the governor? Thanks so much love the channel!
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