I could have made it work all day long with "standard piping," but I would have heads discharge 16gpm - 24gpm and that was not going to fly. The elevation was killing me in trying to keep that 100-120% discharge criteria. It actually had to work out to a crazy looped system with "unique" sizing to get it all to flow at the required densities and such. Now, this hangar had a pitch to it, so we had to do some similar things to what you describe. Per NFPA 16 (I think that is the foam standard), you can only discharge between 100% and 120% of required flow for the sprinkler. RE: Hydraulic Calculation for Fire Protection TravisMack (Mechanical) 11 Mar 13 20:37 Sorry to get on my soapbox but I am the #1 proponent of all technicians learning first to do it by hand. Not something I do often but sometimes it is the only way or the way that will give you the most "safety factor" which I want.Īnyone else ever have a job where you did it this way? Run the main in the peak because the water was so tight? Sure, it's rear end backwards but it works, people at work are looking at me like I came from mars, but it works.
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Whatever you did, whatever size pipe you ran even if it was 3" lines, you were going to pick up 1.3 psi between every sprinkler and your water requirement is certainly going to bust the 680 with hose you got to work with. The worst thing to do would be to try the traditional way with mains at the eave and lines running up the slope. I didn't care about pipe size, the size I selected was to achieve as close to a friction loss of 1.3 psi between heads to offset the elevation pressure gain and we all know what that does. the system requires 415 gpm for a density of. I think I did pretty good given the peak. 40 because I wanted to "balance" my flows. The main is at the peak of the building and instead of using one size sch. To make it work everything I did is backwards. Obviously any water I use above 430 is going to really cost in terms of being doable so I resorted to a little trick I learned doing hand calculations that may not be apparent to those who never did hand calcs. With a system using 430 gpm with 250 hose I have 24.1 psi left at the street.
#Hass hydraulic calculation software error plus#
The trick here is to keep the sprinkler water requirement as low as possible so that sprinkler plus hose does not draw the suction below 20 psi remember I have a backflow assembly that is going to cost me 3 psi. how do you fix that "mistake"?īecause of the roof pitch we were designing to a density of. I used a 400 gpm 55 psi pump because in Georgia you better not run the suction, which is measured at the pump suction flange, below 20 psi with the pump discharging at 150% or you fail the test. I have a building measuring 120' by 100' across having 14' eaves and a 3 in 12 pitch placing the peak 26'-6". I did my first calculated system in 1976 and it wasn't until 10 years later computers that could do the work were made available to the general public.Īnd I got really good at it too where simple grids weren't a problem except they did take some time.įor example we're doing this one job now that I've taken a lot of grief on because nobody has seen done what I did because I learned it doing hand calcs a long time ago.
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#Hass hydraulic calculation software error how to#
I've got plenty of N^1.85 graph paper and no end of the old work sheets given out by Viking we learned how to use by attending one of Jack Woods three day class in Hastings. Over the years I've trained 2 other layout technicians from scratch and before moving on to HASS I've always insisted they first be able to hand calculate trees, loops and very simple girds because in my view that is the only way a trainee can actually see and feel what is happening. The reason for the Hand calc is that it gives a person thorough understanding of the calcs as such his confidence,ability and precision is enhanced.Kudos to you!