How to Set Up an Expansion Tank for a Sprinkler System

An expansion tank relieves built-up water pressure in a sprinkler line. The tank sits between the sprinklers and the check valve or backflow preventor. An expansion tank is important in many types of sprinkler systems, including fire-suppression systems and irrigation lines that may be subject to high water pressure. A properly installed expansion tank will keep sprinkler lines working and can prevent blowouts in the line, as well as potentially costly cleanups.

3/4-inch threaded tee
3/4-inch PVC pipe
3/4-inch 90-degree PVC adapter
Teflon tape
PVC riser
Expansion tank

Instructions

- 1
  Turn off the supply line using the shut-off valve.
- 2
  Locate the backflow preventor or check valve. These devices are located between the main water line and the sprinklers, and they prevent water from flowing back into the main line.
- 3
  Install the tee fitting onto the supply line after the backflow preventor but before the first sprinkler.
- 4
  
  Use PVC pipe.
  
  Select a length of PVC pipe that will reach the desired location of the expansion tank.
- 5
  Attach one end of the PVC pipe to the top of the tee fitting.
- 6
  Attach a 90-degree PVC adapter onto the other end of the PVC pipe. This is where the expansion tank will sit.
- 7
  Cover the threads of both sides of a short PVC riser with Teflon tape.
- 8
  Screw a PVC riser into the other end of the 90-degree adapter.
- 9
  Screw the attachment port on the expansion tank onto the other end of the PVC riser.
- 10
  Turn the main water line back on by reversing the handle on the shut-off valve. Check all attachment points for leaks.

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