Echo Sim — pressure sonar in drip pipe

pipe wave speed

16 mm lateral277 m/s

32 mm submain309 m/s

40 mm supply313 m/s

Plastic stretches, so the wave crawls. Steel would be 1400 m/s. Slow is good — it spreads the echoes apart.

the two rulers

1 row of submain19.4 ms

1 m of lateral7.2 ms

box A — at the valve

echo at—

box B — far end of submain

direct pulse—

echo—

gap—

answer

fire a pulse

place the fault

row5

metres along50

Or just click the pipe in the picture.

Click a row: ok → clog → burst → ok, then fire pulse.

Blue = the probe going out. Gold = a positive echo (pinch, a dead end). Red = a negative echo (a hole). Dim green = the harmless echoes every healthy row's dead end sends back.

Box B's gap gives the metres — the row cancels out.
Box A's echo time then gives the row. No synced clocks.