Pumping from a charged source

[clayton_1]

Hello , I wanted to know if i am pumping from a source that is already preasurized to say 100psi. And I have 100psi pump, will my output pressure be 200psi.

 

[Twowaxhack]

Hello , I wanted to know if i am pumping from a source that is already preasurized to say 100psi. And I have 100psi pump, will my output pressure be 200psi.

No

 

[clayton_1]

Ok but if i run 2 pumps in series the pressure stacks with each pump so why wouldnt it be the same with a starting preasure .

 

[Twowaxhack]

Ok but if i run 2 pumps in series the pressure stacks with each pump so why wouldnt it be the same with a starting preasure .

I googled it and it said that the pressure would be doubled if the flow rate stayed the same. That’s for centrifugal pumps.

So you’re absolutely correct.

What are you doing ? You Building a high pressure shower for dirty people ?

 

[Twowaxhack]

Here, you can read all about it.

https://www.engineeringtoolbox.com/amp/pumps-parallel-serial-d_636.html

 

[clayton_1]

I am simply trying to find a cheap way to pump propane from a cylinder into my truck tank needs to be Abel to Handel lpg and have a max pressure of about 290 + and a flow rate of atleast a gallon a minute

 

[FishScreener]

Centrifugal pumps work on Total Dynamic Head (TDH). So roughly they add if you select the correct pumps.. Think of deep well, multistage submersibles. They will frequently have 13-stages, or stacked pumps to generate the head needed to push water up several hundred feet, and generate 60-psi at the surface.

We used to build large reservoirs of 20 to 100 million gallon, with adjacent pump stations constructed with the pumps approximately twenty feet below the bottom of the resrvoir to help prevent cavitation..

We had to account for that positive suction head, as opposed to the normal negative head seen in small systems, in the selection of the pump to optimize the wire to water efficiency.

TDH=( Net Positive Suction head + discharge head + friction Head).

It takes a bit of physics, to start to really understand it, but you can get a functional understanding with just algebra and a good book.

 

[havasu]

When you are dealing with a flammable material, I certainly hope you seek out experts in the field, and not relying on the opinion of plumbers, who normally deal with water and sewage.

 

[FishScreener]

I agree with Havasu. If your here looking for advice on pumping liquid propane, you are in the wrong place. I have built a few liquified natural gas filling stations. And those systems were a real pain to build…

 

[Valveman]

Yes centrifugal pumps add what they can make to the pressure coming in. But I am giving no advice for pumping propane and wouldn't recommend looking for the cheapest option.