How many feet apart should hangers for 1-1/4 inch standard steel pipe be placed?

The appropriate spacing for hangers for 1-1/4 inch standard steel pipe is indeed 12 feet. This specification is based on standard plumbing and piping installation practices, which dictate that hangers are used to support pipes at designated intervals to ensure structural stability and prevent sagging or bending.

Using 12 feet between hangers provides adequate support while allowing for thermal expansion and contraction of the pipe. It's important that the hangers are placed at the correct intervals to prevent undue stress on the joints and connections, which can lead to potential leaks or failures over time.

By adhering to this spacing guideline, installers can maintain the integrity of the piping system while optimizing performance and longevity. Proper support is crucial not only for function but also for safety considerations within any plumbing or sprinkler system.