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  1. doingwhat

    13D/13R closet door

    Hi all, Do we need to install a fire sprinkler head in a closet that is less than 24 square feet but without a closet door ? Does the closet (without s door) need to have a minimum lintel depth of 8 inches? Ray
  2. doingwhat

    Max Head Coverage in attic / concealed space

    a 1 story building with a 2x10 wood trusses and the roof pitch is less than 4:12 Is the space between the wood trusses and the suspended ceiling an attic or concealed space? What is the difference between attic and concealed space? So in this case, what is the maximum coverage per head in this...
  3. doingwhat

    Definition of Branchline vs Cross mains

    i can easily move some heads to the 1-1/2" pipe to make them meet the definition of branch line.
  4. doingwhat

    Definition of Branchline vs Cross mains

    so this is the floor plan. all pipe are cpvc.
  5. doingwhat

    Definition of Branchline vs Cross mains

    do you mean i have to install bracing for the cpvc pipe regardless of the size?
  6. doingwhat

    Definition of Branchline vs Cross mains

    https://files.engineering.com/getfile.aspx?folder=b17c0583-7c8b-4fda-b355-69b357c8cb1f&file=a.jpg
  7. doingwhat

    Definition of Branchline vs Cross mains

    Our concern is the that every time we branch off from a primary branchline to pick two or three heads in small rooms the preceding branchline will be viewed as a cross main and then would have to be seismically braced regardless of size. If I only use all 1" to 1-1/2" CPVC for a small 13R...
  8. doingwhat

    How do i select the size of the air compressor for a dry pipe system?

    is that means i can select the model with 250 gpm system capacity? 160.6 gpm < 250 gpm
  9. doingwhat

    How do i select the size of the air compressor for a dry pipe system?

    System demand for the dry pipe is 160.6 gpm length of dry pipe 4" main is about 121 ft length of the 2-1/2" branch line is about 106 ft So how do i select the size of the air compressor?
  10. doingwhat

    Elevation Gain formula

    Provide a calculation showing that the 5’-4” long branch line and drop, including the elevation gain from the cooler ceiling to the existing branch line at .445 X 100 = 45.5gpm, is less than the staring pressure for the roof level sprinklers at .5 X 11’-6” X 8’ = 46gpm. If the friction loss...
  11. doingwhat

    pressure loss for the hose valve

    43' of 2½" , 500gpm The pressure loss is 21.5? The pressure for the 500gpm hose is dropped to 83.4 (node g2) I can't get the system work even if i change to a 10" standpipe. What did i do wrong here?
  12. doingwhat

    pressure loss for the hose valve

    How do I account the pressure loss for the hose valve? From table 8.3.1.3 NFPA 14 I figure the equivalent length should be 31+12=43 ft (hose+tee) So where do i add this length in the hass program ?
  13. doingwhat

    Water allowance for private hydrant

    so why 100 gpm?
  14. doingwhat

    Water allowance for private hydrant

    All on-site fire hydrants shall flow a minimum of 1,250 gallons per minute at 20 psi for a duration of two hours. If more than one on-site fire hydrant is required, the on-site fire flow shall be at least 2,500 gallons per minute at 20 psi, flowing from two hydrants simultaneously. On site flow...
  15. doingwhat

    Water allowance for private hydrant

    I have a question regarding water allowance for private hydrant. According to NFPA 13, 11.1.6.2 Water allowance for outside hose shall be added to the sprinkler requirement at the city main or a private hydrant, whichever is closer to the system riser. Project info. 5 stories office building...
  16. doingwhat

    In Rack Sprinkler

    tying mistake. Ceiling height should be 28'10
  17. doingwhat

    In Rack Sprinkler

    I have a project that we have to install the in-rack sprinkler for plastic group A. The existing density for the ceiling sprinkler is 0.45 GPM/sq ft. / 3,000s.f. Storage height is 25ft and Ceiling height is 25'-10", Non-excapsulated, single row rack, My question is do I need a separate control...
  18. doingwhat

    Why tyco sprinkler head is much more expensive than globe sprinkler?

    Anyone use globe sprinkler before?
  19. doingwhat

    what is the minuminm density requirement for an existing warehouse (retail packaging)

    Even though the commodities is Plastic A, if the sunglasses is cartoned and place on a rack, the require density is still 0.20/1500 (Table 13.2.1)w/storage height between >10 to <=12
  20. doingwhat

    what is the minuminm density requirement for an existing warehouse (retail packaging)

    i think sunglasses packaging is treated as Class IV commodities according to NFPA figure 15.2.2 Note: cartons that contain group a plastic materal are permitted to be tread as class IV commodities under the following conditions. 1) There are multiple layers of corrugation or equivalent outer...

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