What is the hydraulically most demanding area and why?
What is the hydraulically most demanding area and why?
(OP)
System has two different areas.
Area #1 requires 345.5 gpm @ 71.2 psi at base of riser
Area #2 requires 341.1 gpm @ 72.1 psi at base of riser
Hose stream are 250 gpm for each area.
Area #1 requires 345.5 gpm @ 71.2 psi at base of riser
Area #2 requires 341.1 gpm @ 72.1 psi at base of riser
Hose stream are 250 gpm for each area.





RE: What is the hydraulically most demanding area and why?
RE: What is the hydraulically most demanding area and why?
Oh the humanity. Can't you just put SYSTEM 1 & 2 on the hydraulic nameplate and call it good? Realistically, the difference is so small that its futile.
Are you going to tell use that the fire code official is requiring both? Please, no AHJ bashing....
RE: What is the hydraulically most demanding area and why?
My point, does it really matter which one you use? I would be happy that u plan for a hydraulic placard on the riser! In NJ most times we never find them. When I teach classes to AHJ's I always tell them if they do nothing to enforce the code AT LEAST make sure they hang the placard!
RE: What is the hydraulically most demanding area and why?
PS - I agree with everyone else in that it is a non-issue
RE: What is the hydraulically most demanding area and why?
Sure, I agree it is a non-issue but here's the point.
I have a grid that isn't uniform and HASS will only peak uniform grids. So I peaked it by hand, built the sytem myself, assigned nodes, input pipe and "stepped" open heads across the grid to find my most remote area.
14.4.4.2* Gridded Systems.
14.4.4.2.1 For gridded systems, the designer shall verify that the hydraulically most demanding area is being used.
14.4.4.2.2 A minimum of two additional sets of calculations shall be submitted to demonstrate peaking of demand area friction loss when compared to areas immediately adjacent on either side along the same branch lines, unless the requirements of 14.4.4.2.3 are met.
14.4.4.2.3 Computer programs that show the peaking of the demand area friction loss shall be acceptable based on a single set of calculations.
When the grid is non-standard HASS will not automatically peak correctly.
Since I have to submit a minimum of 3 sets what area is the most remote?