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Best Practices For Installing Hangers and Supports in CPVC Fire Protection Systems

By: Mark Knurek on July 2nd, 2019

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Best Practices For Installing Hangers and Supports in CPVC Fire Protection Systems


BlazeMaster® CPVC is a strong, durable material that maintains its structure better than most commonly used plastics.

However, the pipe can begin to sag on long runs if not properly held up by supports and hangers. This could lead to unsightly appearance, and unnecessary strain on the piping material and joints.

In addition to manufacturer instructions, installers should adhere to the following best practices when selecting and placing supports and hangers for their system.


Choosing The Right Hanger or Bracket For Supporting CPVC Piping

The best type of hanger or bracket varies depending on how the pipe is being installed and the type of sprinkler heads being used. That said, here are a few general considerations:

  • Hangers and brackets should comply with the requirements and regulations of each build. Often, this means that they need to be third party listed and in compliance with NFPA 13 and 13R.
  • The load bearing properties should correlate with the size of the pipe, i.e. 1.5-in. (40 mm) hangers for 1.5-in. (40 mm) pipe.
  • Ensure that hangers are free of abrasive edges to avoid scratching the pipe, and clear of foreign substances or oils which may inadvertently damage the piping material.


How Far Apart Should CPVC Piping Supports Be?

Refer to your manufacturer's installation manual for exact information on how far apart CPVC supports should be, but it is generally recommended to follow the table below to find the maximum distance between supports/hangers on a straight, horizontal run.



Proper Placement of Supports in CPVC Systems

In addition to holding the piping up, hangers and supports should be used to lower stress on joints and elbows, which may experience a jolt when a system is activated.

When a sprinkler head activates, a significant reactive force can be exerted on the pipe. The closest hanger can be used to brace the pipe against this vertical lift. This is done using any hanger, which acts as both a brace and support for the system.

While any number of techniques can be used to brace the pipe, there are four acceptable approaches to preventing upward movement of the sprinkler through the ceiling:

  • Standard Band Hanger: With the threaded support rod positioned to 1/16 in. (1.56 mm) above the pipe.
  • Split-Ring Hanger
  • Wrap-Around U hanger
  • Special Escutcheon


Accounting For Thermal Expansion in CPVC Fire Protection Systems

As external and internal temperatures change, piping systems can expand and contract. As the pipe moves, it will place unnecessary stress on the piping material if there is no mechanism in place to deflect it. This stress can weaken or damage the piping material.

There are three common mechanisms to deflect this expansion/contraction stress:

  • Change in Direction: A natural change in the piping direction, such as the end of a wall or to avoid an immovable object.
  • Offsets: Placed in the middle of a pipe run, an offset places two sequential elbows with a perpendicular piece connecting the two halfs. The perpendicular piece absorbs the stress caused by the longer runs expanding and contrasting.
  • Expansion Loops: These loops create a “U” shape in the middle of a pipe run. The opening of the “U” to pinch in or expand out without too much stress being applied to one section of pipe.

Each of these mechanisms requires proper placement of hangers and supports to allow them to effectively deflect the stress. Consult with our team of system engineers or your manufacturer for proper placement instructions.


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