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Measuring flow and pressure

Measuring flow and pressure

Measuring flow and pressure

(OP)
I'm working on an old well treatment plant, replacing pressure filter vessels.  A high service pump transfers water from a settling basin through the filters, softeners, and ultimately into the elevated storage tank.

The flow rate of this distribution pump is unknown, thus the application rate of the filters is unknown.  I have just received a pitot gauge that i ordered and intend to use it to measure the flow rate in the 2" discharge piping from the pump.  This pitot gauge requires a drilled hole size of 5/8"

Here's my question:
I'd also like to measure the pressure loss through the existing filters.  There are no existing gauges on the piping or controls.  I have a 1/4" NPT pressure gauge.  My plan was to (after measuring the flow with the pitot) drill out the hole a little larger, tap it for a reducer bushing that I could then screw the pressure gauge into.  This would be in order to avoid drilling an extra hole in the existing piping.  Now that I've written this down, I think I'll just drill 3 holes since the piping will be replaced in less than a year anyway, along with the vessels.  What do you think?  Or perhaps there is a simpler way to get the information I'm looking for?

RE: Measuring flow and pressure

Think you have answered your own question.

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