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Recent content by MechEng2007

  1. MechEng2007

    Hanging Issues in Attic

    Hi - Thanks in advance for any help on this issue. We have a 4" pipe feeding back-to-back attic sprinklers in an attic with standard 2x4 roof trusses; the pipe will be running perpendicular to the trusses. What is an acceptable method to hang this pipe per NFPA 13 (2022 edition)? Option 1: Per...
  2. MechEng2007

    NFPA 30 15,000 Gallon Tank

    Hello, I am working on a project that has a few carbon-steel tanks that hold motor oil (Class IIIB). Each tank is approximately 12,000 to 16,000 gallons. Why doesn't NFPA 30 provide sprinkler protection design information? Protection schemes are provided for "portable" tanks, but these have a...
  3. MechEng2007

    Storage System Design

    Thanks for the input. I classified it as a Class I because the FM tables I am using do not differentiate between a Class I, II, or III. We started with NPFA 13 and within that standard I am working with a Class III. There are some areas with idle wood pallets and some plastic pallets, but that...
  4. MechEng2007

    Storage System Design

    Good Morning, I am working on a storage building that has rack storage and we are using FM Design Guidelines. The client stores a Class I commodity on a wood pallet. These pallets are on a rack system that has 20' aisles and on each side of the aisle a 40' deep rack is loaded by a forklift that...
  5. MechEng2007

    maximum number of system risers on a multiple riser header

    I heard that FM was eliminating the maximum zone size because they wanted to reduce the number of control valves on a system. Less valves means there is less of a chance one is closed in the event of a fire.
  6. MechEng2007

    Standpipe Question

    We are installing a sprinkler system and standpipe in a 4-story hotel. The system is design/build and the local AHJ doesnt have much knowledge about sprinklers/standpipes. Can I install a dry manual standpipe rather than a wet manual one? Floor control valves are not required and the local AHJ...
  7. MechEng2007

    Occupancy Classification Question

    There is a fair amount of dust on everything you touch. Product is handled in various shoots to fill bags and cartons.
  8. MechEng2007

    Occupancy Classification Question

    Working on a project that packages seed and/or grains into cartons for shipment. Storage of cartons takes place in a separate building. So basically, all this building does is house the packaging of the seeds and/or grains. Ordinary Hazard Group II an appropriate classification?
  9. MechEng2007

    Simple Loop - Hardy Cross

    I had not that about that Travis. Thank you. I will check my fitting take-outs.
  10. MechEng2007

    Simple Loop - Hardy Cross

    I have a Hardy Cross example I am trying to solve as practice for the NICET test. The link below is a picture of the loop. Total fittings are 4 elbows and 2 tees. I set a flow of 250 gpm at a minimum pressure of 7 psi at node Z. Node A is the supply with 50, 40, 1,000 set as the static...
  11. MechEng2007

    Private Service Main

    What is the maximum water pressure in private service mains? The question was asked by a sprinkler fitter who was tested on it. Thank you in advance.
  12. MechEng2007

    NFPA- Storage water size for Sprinkler system

    Not sure if you need to figure the hydrants. I didnt see it in the 2007 edition. If you are supplying hydrants and the applicable standard is 2003 you have to. You may need to use IFC if the local AHJ requires it.
  13. MechEng2007

    NFPA- Storage water size for Sprinkler system

    Assume Ordinary Group I occupancy due to the labs. To find the amount of water needed you would take 0.15 gpm x 1,500 sq ft (as shown in Figure 11.2.3.1.1) which comes out to 225 gallons. The amount of water multiplied by 60 minutes comes out to 13,500 gallon. This would be your tank size...
  14. MechEng2007

    NFPA- Storage water size for Sprinkler system

    See Table 11.2.3.1.2 in NFPA 13, 2007. This lists Water Supply Duration Requirements by occupancy type.
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