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The Sammy X-Press 35 (XP 35) is UL listed to support steel pipe up to 4" Nominal Pipe Size. I did not look very hard, but it did not appear that the hangers you linked to are UL listed (looks like they are FM approved, however). If you are outside the US the rules may be different, but you...

Travis, Do many communities / states adopt the IFC tables? I don't think more than 15% of the locations I've seen flow information on in my state could meet those requirements... the building this thread is about would only have about 45% of the required flow without the additional hydrant /...

Thanks Cidona. I was thinking that it would be OK - and as they are both city supplies, I wouldn't think there would be any cross-contamination concerns (it won't be possible to cross-connect them, but just the same). We know for a fact that they are 100% segregated, as we originally thought...

I have a project in a town with two separate water systems, each fed off of its own water tower, which are not connected. The water running into the building cannot support the system demand with outside hose, so the owner wants to bring a line from the other water system (which dead ends about...

Dave, You are exactly right, I want what is best for my customer, and it I don't think they should have to pay to boost pressure in a water system because the city decided to drop it on a whim. We spoke to the local Fire Marshal and he's very unhappy with the water department for messing...

We did a second flow test yesterday and the results were 72 static, 48 residual, 919 gpm. The static pressure only got to 72 after we flowed the hydrant for a minute or so and then shut if off, the "true" static was 52psi. The water dept said they increased the reaction time of the PRV and...

Energy prices aren't going down here - in fact they are brutal right now considering how much energy it takes to heat a home on a day like today (-15 when I left for work). The project is in a town of 3,600, they just seem to do things they way they're going to do them, because that is the way...

The water dept. said that they were worried about pressure surges when they are pumping to fill their water tower, so they installed a 10" PRV a while back, and just recently hooked up a 4" PRV (both somewhere upstream of our test hydrants). The way it was described to me (second hand) was that...

The addition is not a seperate compartment from the existing sales floor, they are extending the existing building 50' to the right, and removing the existing wall, thus growing the existing sales floor. This means that we'll have to calc the entire building, and the existing head spacing and...

Thanks for the input. We will be contacting the water purveyor on Monday to see if there is anything abnormal... but if there is, it looks like it may have happened quite a while ago. I think this discussion will be more effective with actual numbers... The 1994 flow test was 73 static / 68...

I'm sure others have run into this situiation before, so I'd be interested in any tips/advice/war stories. A grocery store was built in 1994 and they are currently constructing an addition (by that I mean its already up, and they just came looking for sprinklers). The static pressure has...

fireguy, don't say "only does service and repair work"... I'm pretty sure that is the only place anyone in the industry is making money at this point, with the way people are starting to bid work.

Check the listing of the individual head (I assume they sent you a material submittal along with the calcs) to see what the operating pressure of that specific head is. More important than that, however, is checking how much water they are flowing out of the most demanding head. This is...

I'm reading "Lean Six Sigma for Service" right now, it gives a pretty good overview of these methods applied to service applications, though I disagree with the author's contention that Lean is only about "speed" and 6S is only about "reducing errors". My girlfriend's hospital is just starting...

I'm sorry if I came off as dismissive - I'm trying to get to a solution that is best for my budget and treats the client right. I understand your concerns with the flex hose connections, For the same reason I dislike using ultra-thinwall pipe, I just don't think it will last the way a sprinkler...

stookeyfpe: The lawsuits aren't my concern. If a court finds that Viking (or any other company) violated the intellectual property rights of Flex Head, that will not cause some repo man to come onto the job and rip out all the "knockoff" products. There is a bit of an ethical question here...

I called Viking tech support and they said it was no problem to use it in that way, however only the flexhead installation guide mentions that they are "intended for use in hydraulically designed wet, pre-action, deluge or dry pipe sprinkler per NFPA 13, 13R, and 13D guidelines." This still...

Has anyone thought about using Flex Heads as return bends in a heated area attached to a dry system? I can't find anywhere in NFPA 13 that states exactly what the arrangement of a return bend must be and in my mind if the tubing had a similar rise, run, drop return bend it would be meeting the...

My understanding is that the AHJs in our area are not allowing for this exemption (8.14.1.2.9) in nursing homes at this time - our company has already had to go back to one location and install protection in a similar scenario because the inspector "didn't like" that it was un-sprinkled. If it...

It is an NFPA 13 system for a Nursing Home retrofit, so we have to deal with the concealed spaces one way or another. Stookey -- Thanks for the cite re: heat release and flame spread. I get the feeling that this idea will get shot down simply because it is outside the norm but it has been...