Backflow Preventer
 

This seems like a scam. Explain to me why a backflow preventer is so critical that it needs professional annual inspection ($35, which in 2min of work ends up being $1000/hr). How is my sprinkler system that is downhill of the water main supposed to backflow against 40 PSI of pressure? The water in the sprinkler system came from the water main, so at worst it just returns the same water that was already there.

There's about 5 assumptions here that aren't adding up to anything resembling a remotely possible threat.

• water can flow uphill
• non-pressurized water can force past a 40 PSI mains pressure
• A valve isn't enough to stop water flow
• safe water magically turns dangerous when it enters a sprinkler pipe
• the backflow preventer and water valve will fail, and annual inspection will remedy this

IDK they're just required.
Remember people who inactive these regs typically have a political science degree, not a plumbing license or engineering degree.

They might be worried someone might try to tie in stored rain water to their sprinkler sys.

I thought the purpose was incase a loss of pressure will create a vacuum in the water system and suck stuff back in, like if someone left a pesticide hose attachment on the hose.

Or a firetruck is attached to a hydrant and causes a drop in water pressure. My dad told me years ago stories of sucking water out of water heaters with the fire truck. Is the PRV on a water heater also a vacuum breaker? I don't know where the air get in to let that happen if it doesn't let it in so it doesn't implode.

We don't have them where I live, no codes pretty much.

It takes about 350psi to explode a waterheater, I do think think a water vacuum will crush it.

So it's in case a fire truck is pumping faster than mains pressure can replenish, and if I happen to be spraying pesticides at the same time? There are hydrants in this neighborhood.

Is this a frequent enough problem that we need a solution?

Here's one for you. In KY a home owner has to register water heater purchases made within the state to the state government, be installed by a licensed plumber and go through a state inspection. I live in a double wide mobile home and had a water heater leak in 2016 so I called to find out what all the exact requirements were. Because I live in a manufactured home I could buy a water heater in KY, install it myself and didn't have to have a state inspection. They said if I was ever questioned about the purchase to tell them it was installed in a manufactured home. A plumbing contractor here in town quoted me $1200. for a water heater and to do the install. I bought a water heater for about $350 if I remember correctly and installed it myself in an hour. I live about 25 miles from TN and if I was going to have to pay a plumber $1200. to install a water heater then get an inspection on it I was just going to go to TN buy the water heater, install it and keep my mouth shut. I suspect the reason they don't require a state inspection on a manufactured home is because most manufactured homes come with single element water heaters and wired with 14 ga. wire and most replacement water heaters are dual element units that should be wired with 12 ga. wire. I did mine right, I found a single element heater rather than running a new 12 ga. wire, but I'll bet there are many mobile homes out there that have had the water heater replaced and are not up to code. I guess this is a loophole for the mobile home manufacturers to keep them from having to use 12 ga. that would cost them an extra $ .25 instead of 14 ga. wire and keeps the state from getting their pants sued off when someones house catches fire and burns their family up because the water heater circuit wasn't wired with the correct 12 ga. wire and the state didn't require an inspection. The way my home is set up my breaker box is in the utility room, the water heater is on the other side of the utility room wall in the master bath closet. The difference would have amounted to about 15' of 12 ga. wire vs. 15' of 14 ga. wire. Truth be known mobile homes probably need the state inspection worse than stick built homes.

Most mobile homes aren't up to code

Why am I not surprised? When I lived in NC I lived in a single wide and did lots of work trying to spruce it up a little. Some of the walls were looking pretty bad so I decided to hang wall paper in most of the rooms. I found walls as much as 1 1/4" out of plumb in 7'. About the only way to make the paper look halfway right was to get something with lots of small detail and cut it to fit in the corner. By using a paper with lots of small detail and cutting it right at the corner it wasn't so noticeable that the pattern didn't match up. Anything that had large detail such as large flowers would have stuck out like a sore thumb.

All of our water meters should have a check valve built into them.

.

https://backflowtesterservice.com/wh...nter-required/


It’s pretty much the same in every state.


>