Pressure Drop Question

[COOLRUNNINGS]

Hi Gents, only if you have time can I get your quick opinion on this question? No problem if you are busy.


To make it simple lets say there is a single hose about 25 feet long. Each end of the hose contains a pair of quick connect fittings. (Four quick connect fittings total). Assume a Nipple, Tee and a Pressure Gauge is attached to the free ends. Assume a supply or return line is attached to the free end of the Tees. There is no trapped air in the system.

Then imagine water is flowing through the entire system at 15 GPM and the Delta of the two pressure guages is 19 psig.

Then lets assume I disconnect the two pairs of quick connect fittings and connect the supply directly to the return. This will bypass the original hose and two of the quick connect fittings.

Then assume I adjust a manual valve to set the flow to 15 GPM and I measure the delta of the two gauges to be a pressure drop of 9 psig.

If I am only interested in the pressure drop of the original 25 foot hose and two of the quick connect fittings is it fair to say this region has a pressure drop of (19psig minus 9psig) = 10psig?

In your opinion is this person correct or is he being a jackass? Thanks for the input.

 

[3DDave]

Who is being a jackass?

 

[waross]

That may be correct, but I imagine that I may not be imagining what your are imagining. Imagine what we could do if we had an image of your connections, before and after.
With less left to the imagination, I imagine that we may be able to say for sure.
ps: An image of the piping and nipples as connected.
No need to include an image of the jackass. I imagine that we can all imagine someone from our past (or present) that will nullify the need for a four legged image.
Imagineering:
Let your imagination soar and then engineer it down to earth.

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Ohm's law
Not just a good idea;
It's the LAW!