How Long Does a Sprinkler Blowout Take?
Most residential blowouts take somewhere between twenty minutes and an hour. That is a wide range, and the reason it is wide is worth understanding — because a blowout that finishes suspiciously fast is usually a blowout that skipped something.
What determines the time
The work is sequential. Air goes through one zone at a time, and each zone runs until the water stops and the air coming out the heads is dry. You cannot rush that part without leaving water in the line, which defeats the entire purpose.
So the math is roughly: number of zones, times the time each zone needs, plus setup and shutdown. A six-zone system on a well-marked controller is quick. A fourteen-zone system with a controller nobody has labeled since 2009 takes longer, because part of the job is figuring out what is actually connected to what.
What happens while we are there
- Shut off the supply. The water feeding the system gets isolated first. Nothing else can happen until that is done.
- Connect at the blowout port. We hook the compressor to the system and set the pressure appropriately — high enough to clear the lines, low enough not to damage heads or fittings.
- Run every zone. One at a time, each until it runs dry. We watch the heads. If a zone will not clear, that tells us something and we will mention it.
- Drain the backflow assembly. This is the part cheap jobs skip. The device gets drained and its valves left in the right position for winter.
- Set the controller. Off or rain mode for the season, so it does not try to run in January.
- Tell you what we saw. Worn heads, a valve behaving badly, corrosion on fittings — anything that should be on your radar before spring.
Why a five-minute blowout is a red flag
If someone connects a compressor, blasts the system for a few minutes and leaves, the odds are good that the later zones never fully cleared and the backflow device was never touched. You will not find out until April, when the system comes back on and something is broken.
The whole value of the service is thoroughness. There is no version of this job where speed is the point.
Do you have to be there?
Usually not — we cover that in detail in a separate post. What we need is access to the controller, the backflow assembly and the main shutoff. If those are reachable and we know how to get to them, the appointment runs fine without you.
Commercial and larger systems
Community common areas, commercial properties and larger multi-zone systems run longer and are scheduled differently. If that is what you have, call and we will talk through it rather than guessing.
Booking
Call (609) 971-9044 or request a service date and we will call to schedule the next available time. We work across Forked River, Barnegat, Manahawkin and the rest of Southern Ocean County.
If you are still working out when to book, this piece on winterization timing in New Jersey covers it.
