dry system delivery time
dry system delivery time
(OP)
Does anyone know the best way to get an inexpensive [or free] program that would estimate the water delivery time for a dry system. We have hydratec calc that may be used somehow to input the info. Thanks for any suggestion.





RE: dry system delivery time
FDT calcs are a pain to input unless you have a tree system that is typical for everything.
Also, it is supposed to work on "simple" loops, but not compound. I put in a large preaction system that was a "simple" loop. After many problems, I sent the file Tyco. They just said. "well, I guess it won't work on that loop."
It is a great program and was within 0.5 seconds of actual trip time. But, it is tedious to input based on what I saw at the time.
Travis Mack
MFP Design, LLC
RE: dry system delivery time
Regards
Dave
RE: dry system delivery time
RE: dry system delivery time
Travis Mack
MFP Design, LLC
RE: dry system delivery time
Yes, but not now.
"Well that's interesting. How DOES an FPE go about designing a dry system to satisfy the 60 second requirement (where it's called for)?"
Gut instinct based on past experience with similar systems having similar water supplies.
When in doubt prepare to manifold the riser ahead of time.
Just finished with a system having a 1,060 gallon capacity but I wasn't to worried knowing I had 152 static, 150 residual flowing 2,080 gpm. FM job so it wasn't pressure that dictated pipe size but velocity which had to be < 25 fps. This system delivered water to the inspectors test in 55 seconds.
But I wasn't sure so when I laid the system out I made it so if I had to divide the system all I would have to do would be to add a second dry valve and few joints of 6" galvanized pipe. I was unsure enough I left a tee with a blind flange below the shut off valve.
Would have cost me around $3,500 if I absolutely had to and while it would have made me cry it wouldn't have been an unmitigated disaster.
There is a formula to calculate time to trip the valve but I lost it. Anyone have it?
RE: dry system delivery time
Otherwise unless you want to buy Tyco's software you are safer just keeping your systems smaller.
RE: dry system delivery time
Dave
RE: dry system delivery time
I have aways thought that you would get a faster delivery time if you had a high air pressure rather than a low in the system. The argument for this should be that you would have a more compressed system, which should result in a faster delivery time - but am I totally wrong here?
RE: dry system delivery time
Regards
Dave
RE: dry system delivery time
I'm aware that it will take longer for the valve to operate if you have a high air presure - if you haven't got a accelerator that is. In this case it will be the 'water transit time' that will be the decisive factor. And it is here that I see the benefit by the high air presure. Or?
RE: dry system delivery time
Regards
Dave
RE: dry system delivery time
http://www
The folks in Tyco refered me to somebody who did this type of work on a job basis, so they could supply you with the calcs for a fee.
I dont recall his price.
RE: dry system delivery time
Regards
Dave