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Can Air Block Water Pipes?

Published in Plumbing Issues 2 mins read

Yes, air can block water pipes, creating what's known as an air lock. According to information available, an air lock occurs when pockets of air are trapped by flowing water, preventing the water from flowing freely.

How Air Locks Happen

Air locks are more common in hot water pipes than cold water pipes. This is mainly because cold water pipes generally have higher pressure than hot water pipes.

Understanding Air Locks

An air lock is essentially a bubble of air that obstructs the normal flow of water within a pipe. This trapped air prevents water from passing through the pipe effectively, leading to reduced water pressure or a complete blockage.

Common Causes of Air Locks

  • Trapped Air Pockets: Air can enter the plumbing system during repairs or when the water supply is turned off and on.
  • Low Water Pressure: Insufficient water pressure can prevent air from being purged from the system.
  • Complex Piping Systems: Intricate piping layouts can create areas where air becomes trapped more easily.

Solutions to Remove Air Locks

Several methods can be used to remove air locks from water pipes:

  1. Run the Faucet: Open the affected faucet fully and allow the water to run for several minutes. The water pressure may eventually force the air pocket out.
  2. Bleed the Pipes: Locate the highest point in the plumbing system and open the bleeder valve (if available) to release trapped air.
  3. Use a Hose: Connect a hose to the affected faucet and then to another faucet in the house. Opening both faucets can sometimes create enough pressure to dislodge the air lock.
  4. Call a Plumber: If you are unable to remove the air lock yourself, consult a professional plumber.