Detecting Water Flow Through Pipe

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Discussion Overview

The discussion revolves around methods for detecting water flow through a pipe without using submerged or inserted devices. Participants explore various techniques to identify flow events, such as toilet flushes or leaks, focusing on non-intrusive solutions.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests drilling a tiny hole in the pipe and using a bag or tire pressure gauge to detect flow through pressure changes.
  • Another participant proposes checking the pipe temperature or monitoring vibrations as indirect indicators of flow.
  • A different suggestion involves using a "non-intrusive" flow switch based on Doppler or Ultrasonic principles, with a recommendation to search for available products.
  • One participant questions the reliability of the drilling method, raising concerns that it might cause constant flow.

Areas of Agreement / Disagreement

Participants present multiple competing views on the best method for detecting water flow, and the discussion remains unresolved regarding the effectiveness and practicality of the proposed solutions.

Contextual Notes

Some suggestions depend on specific conditions, such as the type of piping material and the environment, which may not be fully addressed in the discussion.

ssmith579
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I'm looking for a way to detect water flow through a pipe. For example, I want to detect when a toilet flushes or leaks. I'm looking for a way to detect this that doesn't require anything submerged in the tank or inserted into the water line. I really just want to know that water is flowing I don't care about flow rate. Any suggestions would be appreciated.

Steve
 
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The most reliable way would be to drill a tiny hole in the piping (PVC?) on the up side (away from the direction of gravity) and somehow tape a bag over top of the hole. The bag should inflate when there's flow. You could also just put a tire pressure gauge into the hole. Change in pressure would indicate flow. Just make sure both are secured so you don't cause a leak.

If the flow is constant you could check the pipe temperature. It should be a bit cooler than room temperature if it's house water. You could also check for any vibrations in the piping.
 
Not sure of your budget and other requirements, but you can use a "non-intrusive" flow switch based on the Doppler or Ultrasonic principle. Do an internet search for non intrusive flow switch and you will find many producs.
 
mrmiller1 said:
The most reliable way would be to drill a tiny hole in the piping (PVC?) on the up side (away from the direction of gravity)

Wouldn't this cause it to flow all the time? :bugeye:
 

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