What I've done on an arch is take the half chord of the total arch from the wall to what would be the ridgeline if there was one and call that the slope. Then calculate the pitch from there and design accordingly. I'm waiting to hear why this is a bad idea.
On 1/29/07, Ed Kramer <[EMAIL PROTECTED]> wrote:
Todd, I can't find it in black & white, but I'm fairly sure the intent is to allow a hydraulically designed addition be taken off a pipe schedule system - providing you calculate the hyd addition back to the supply. In this case, your 'addition' is really a remodel, but the idea is the same. As long as you're not making changes to the roof-level system, then calcs shouldn't be necessary. Ah, the arched-roof conundrum! On a previous project, after much damage to my hairline and several trips to the well-stocked refrig, I ended up with 2 design areas. The 1st at the top (flat part) of the roof without adding 30% for roof slope, and the 2nd further down the slope adding 30% for slope. What really baffled me was if a fire started in the sloped roof area, how far up the slope (and into the flat roof area) would the heat plume travel? Well, back to the refrig. Ed Kramer Littleton, CO > >I am working on a building which has an existing pipe schedule >system. The system provides protection both above and below. Each >area has separate cross mains and branch lines, but is fed by a >common feed main. The ceiling (both existing and new) are flat and >the roof is arched. The existing piping for the area below is to be >re-used to pipe sprinklers below a new ceiling. This system below is >to be hydraulically calculated, due to the number of sprinklers >necessary to accommodate the new floor plan. May the system above (at >the roof) be treated as an existing pipe schedule and not be >calculated? If it does need to be calculated, how do we calculate the >roof slope for an arched ceiling? It is over the 2:12 slope at the >hip, but decreases to flat at the "peak". > >Todd G. Williams, PE >Fire Protection Design/Consulting >Stonington, Connecticut >860-535-2080 >www.fpdc.com _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
-- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
