One of the repairs I had to make this year was to an above-ground irrigation pipe inside the pump house. The pipe had to be spliced with a telescoping repair coupling, but as the repair was above-ground and the irrigation system in the pump house consisted of two pipes leading off a single pump, this presented a problem. The telescoping coupling was bound to expand with the backpressure of the irrigation system, and that would put a huge strain on the two main pipes in the system.
This video shows how you can do your own above ground irrigation system repair using a telescoping coupling and a strapping system to keep the coupling from expanding with the water pressure. Basically, I used two plumbing tube straps and a nylon strap to hold the coupling together when the irrigation system was on. The two metal straps were tightened around the far ends of the coupling and the nylon strap (I’ve also used wire cables) was used to keep the two plumbing straps from moving apart.