We use trap guards and similar products in every jurisdiction that allows them and have never had a problem. Conversely, trap primers are a maintenance nightmare.
IPC 2015 now allows "trap seal protection devices) (¶1002.4.1.4).
Mirza: I'm doing a project now that has this arrangement (not my design). It's OK by code (IPC), but if it's sanitary or storm water, each discharge would have to tie into a gravity drain through a wye fitting with the branch in the upper quadrant of the pipe prior to dumping into the...
I've found that it's a water provider (water works) preference if any rather than a code issue. Most require the BFP at the property line just past the meter, so that settles it. But in areas where no preference is specified and we have a PRV-BFP or BFP-PRV arrangement, the PRV first makes...
When installing a backflow preventer and PRV in series, which would you install first and why?
I choose the PRV first, then BFP arrangement, since I always assume the more moderate the pressure imposed on a system component (e.g., the BFP), the better.
Does it matter?
You're right PEDarrin. BTW, I found a similar Watts valve that has a bypass sized to handle the flow too small for the main valve. For a 4" PRV, the bypass is 3/4". Spec sheet attached.
Davidhttp://files.engineering.com/getfile.aspx?folder=e13ecf68-bc92-4beb-818d-f2fda73d6579&file=es-f115-74.pdf
I agree PEDarrin2, but in my defense, the Watts rep came out and went over the system with a fine-toothed comb and couldn't figure it out. We even changed out the PRV, thinking it might be bad. No luck.
In retrospect, I should have used a two-PRV arrangement, with more care taken in sizing...
That makes sense. As for a maximum flow, it would exceed 200 gpm with the process loads, so I believe I'll leave the 4" in place and go with the 1" PRV bypass to handle low flows.
Thanks so much. I'll let you know how it comes out.
David
Hydae: the valve we installed is a Watts 115 ACV.
link http://www.watts.com/pages/_products_details.asp?pid=2820
]Link
I thought the bypass was for lower flows, but looking at it again, it appears to be just for regulating the main valve.
Sorry for the poor quality of the link. Haven't...
You're very perceptive! We brought in an outside consultant who came to the same conclusion (that the PRV was the problem, but he didn't offer any solutions), but I was convinced that there was an inherent problem with a loop feed and that closing the valve was the key.
We'll try the pressure...
Thanks for your responses, LittleInch. I've attached a drawing that shows the general arrangement of the piping. The branches to restrooms are oversimplified - there are probably a dozen or so such branches, many to fixtures like emergency showers.
The piping is hung with clevis hangers with...
Thanks for your response. The loop is fed with street pressure. I'll respond with more details - and a sketch if this forum allows them - a little later today.
David
On a number of industrial projects, I have laid out the aboveground domestic water serving plant restrooms, cooling towers, etc. with a grid, or loop, feed. The loop feed allows us to minimize the pipe sizes and velocities while meeting relatively large demands. The loop feed is of course...
It's not unusual for water heater sizes to be larger or smaller than the available (or designed) sizes. Reducing or increasing the piping at or near the heater shouldn't affect the operation of the heater in any way.
