LDi – P4

The danger is that the pipe system will generate a frequency that it amplifies.

The speed of the fastest projectile (2800 feet per second) is half the speed of pressure transfer (5600 feet per second) in a cold liquid de-gassed in a hard pipe.

Rate of pressure transfer a.k.a. "acoustic velocity"

1. Find the effective compressibility for the system.

2. Determine the speed of pressure transfer for "softness".

3. Feet per second or meters per second = Frequency / Hz

feet pipe run meters pipe run

4. Compare System Hz. with pump Hz. and Pipe XY&Z natural shaking Hz.

5. Where there is coincidence, or at a power of, any of them, at any temperature, or for any one nodal length, your pipes are a problem

Easy to prove

Change the pressure, measure it a mile away a second later.

But your flow rate is between 3 ft / sec and 25 ft / sec so flow fluctuation could be addressed with a bottle on a "T".

Pressure is 250+ times faster than flow, so:

Pressure pulsation can not be addressed without interception.

Oil the hinges, put the child on the swing, and press with 1/2 an ounce (14 grams)

Then press with 1/2 oz again and again

The effects are cumulative

Soon catastrophe

Pressure pulsation can be like that too

It depends on system frequency response.

1 psi from the vortexes of the discharge connection

1 psi + 1 psi - system pipe return pulse

3300 miles per hour

1 psi + 20 psi – and again several times per second

Faster than a bullet

1 psi + 200 psi - after a few seconds

Very soon fatigue or burst

It doesn't matter how much you have to begin with, what counts is how much the system turns it into.

Large pipes - with no delta "P" do not scrub out pressure waves - are potential amplifiers.