You could use the retroactivity clause of 1.4 to say it was approved as storage so a lighter hazard should be ok. I would have AHJ sign off on that and make them aware of the QR/SR question. 30.3.3 states existing systems with SR sprinklers can have sprinklers replaced with new SR sprinklers...
You are correct. NFPA 1 and the IFC give a fire flow decrease if the building is sprinklered. Typically a civil or fire protection engineer calculates the required fire flow for a building.
And yes, the required fire flow can vary quite a bit depending on the jurisdiction, adopted codes, and...
Usually the word fire flow is the required flow from fire hydrants outside a facility for manual firefighting. This is based on building area and construction type using NFPA 1 or the IFC Appendix B.
When I hear the word fire water demand that normally means interior water demands for active...
Department of Defense still specs 2" and smaller be sch. 40 and anything larger than 2" may be sch. 10. Per code you may use sch. 10 in preaction systems no problem but your contract/specs may say otherwise.
Hire an inspection company to do the fire pump test. It's worth it to have it done correctly if you don't know how or aren't trained to do it. If you don't want to do the pump test, a hydrant test is always acceptable. NFPA 13 says to calculate the sprinkler system back to where the water supply...
To be correct, you need to include the sprinklers at the end of the branch lines which are more demanding than that sprinklers closer to the main. The example on the right is more correct.
I believe these types of systems are only intended to prevent ember ignition, not prevent a wildfire from consuming a structure. In that case, they may be effective. To prevent a wildfire from consuming a structure, firebreaks, clearing, and other strategies should be used.
One can use the formulas above to model any flowing orifice having water as the agent. K-factors can model fire sprinklers, pipe branch lines, or entire fire sprinkler systems. Your K-factor would be 0.22 in this instance. You could also use Hazen Williams to determine friction loss since it is...
So NFPA 13 does say to include the loss through fittings, but does not include any reducing fittings to include where water does not change directions to figure friction loss. It says if you have the loss to include it. So, I'd say if you have manufacturer data, then including that in your...
Fittings like reducers incur hydraulic losses called minor losses. Typically, NFPA 13 does not require the designer to include minor losses in the calculation process. As UFT12 said, any fitting the sprinkler is installed in has the loss accounted for in the K-factor. Otherwise, we do not figure...
Schedule 10 and 40 are allowed to be used in wet pipe, dry pipe and preaction for just about every situation. What type of fire sprinklers are you using?
Not sure what type of fire sprinklers you are using but many are available in high pressure, up to 250 psi. ESFR and CMSA are usually not available in high pressure but CMDA typically are.
