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  • Users: MGXFP
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  1. MGXFP

    I know I have the the right answer but I just want to make sure.

    I agree with you that no sprinklers are required in the fire pump house.
  2. MGXFP

    I have an older warehouse being converted to an public assembly arena. Does anything need to be done with the sprinkler system?

    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...
  3. MGXFP

    fire water demand

    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...
  4. MGXFP

    fire water demand

    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...
  5. MGXFP

    Schedule 40 vs 10 for pre-action system

    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.
  6. MGXFP

    Flow test or fire pump test

    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...
  7. MGXFP

    Help with Fire Sprinkler Design Area

    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.
  8. MGXFP

    Calculating K Factor (odd oriface size)

    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.
  9. MGXFP

    Calculating K Factor (odd oriface size)

    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...
  10. MGXFP

    NFPA2001 GAS SUPPRESSION SYSTEM

    Hi. A manual only activation can be used, but only if approved by the authority, otherwise the system must have automatic and manual activation.
  11. MGXFP

    Friction loss for reducer in sprinkler calculation

    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...
  12. MGXFP

    Friction loss for reducer in sprinkler calculation

    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...
  13. MGXFP

    Schedule 40 vs 10 for pre-action system

    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?
  14. MGXFP

    Vortex plate

    If you're building a fire water storage tank and the jurisdiction enforces NFPA 22, it must have an anti-vortex plate. See 14.2.13 of NFPA 22.
  15. MGXFP

    Just thought some would get a kick out of this one... the worst installation I have ever seen!

    This goes into the file of a terrible idea, brilliantly executed. Everything is wrong but its done well at least.
  16. MGXFP

    Jockey Pump Design

    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.
  17. MGXFP

    Jockey Pump Design

    4.7.7.2 says not to use relief valves to meet the requirements of the shutoff head being the pump churn plus the minimum suction head to avoid pressures exceeding what the components are rated. You can also figure in the working pressure where the sprinkler are. If the sprinklers are high in the...
  18. MGXFP

    NFPA 13 - Highly Sloped Ceiling/Wall & Ordinary Hazard Sidewall Sprinkler

    As cdafd and Travis said, you cannot have sidewalls spray perpendicular to the slope when the slope exceeds 2:12 unless the sprinkler is listed for that and I know of no sprinkler listed for this use. I believe it is because a fire plume will bypass the sprinkler due to the placement of the...
  19. MGXFP

    NFPA 13 - Highly Sloped Ceiling/Wall & Ordinary Hazard Sidewall Sprinkler

    NFPA 13 defines horizontal as no more than 2:12 slope, sloped ceilings are more than 2:12 slope. Flat just means a continuous plane. Generally, if the slope exceeds 2:12, you are limited to placing the sidewall sprinklers at the top and aiming them down the slope with the deflectors parallel to...
  20. MGXFP

    Converting Between Sprinkler Density/Area Designs

    The only way to be sure is to do the hydraulic calculations to prove it. Your argument makes sense.

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