White Oak wood having a density of 450, moisture-content of 25% is exposed to a standard fire (ASTM E119) test for 2 hours. What is the expected char depth most nearly? a. 1 mm b. 64 mm c. 72 mm d. 224 mm Solution | Posted 08/13/19
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NFPA 20 permits the demand for a suppression system to be between 90% and 140% of a fire pump's rated capacity (NFPA 20-2019 4.10.1 and Annex A.4.10.1). The pressure demand must always be less than the pressure supplied by the pump's performance curve along this range.
Does this concept apply to standpipes? For instance, could a 750 gpm pump provide 1,000 gpm demand for standpipes since it would be running at 133% of its rated flow? If it can be done, is it good practice? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe When doing thrust block calculations NFPA 13 gives an angle that is the bend off the centerline of the original pipe.
What angle should be used for a tee or a dead end? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe Does anyone know which calculation can be applied (or if there is a calculator available) to determine if an insulated pipe will freeze (or how long it will take to freeze)?
We have a scenario where we specified a heat trace system to be used on branch lines extending from the building to an exposed exterior soffit that is subject to freezing conditions. Due to cost concerns, the school/contractor want to remove the heat trace and just insulate the pipe. Thanks. Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe An opening within a smoke partition for air transfer requires what type of protective device? a. fire/smoke damper, minimum 45 minute rating b. fire/smoke damper, minimum 1.5 hour rating c. smoke damper, minimum 250 F rated d. smoke damper, minimum 350 F rated Solution | Posted 08/08/19
Where can I find a contractor the performs internal Water Storage tank inspections per NFPA 25?
The customer is have difficulty as the local contractors do not perform these inspections because of the age of tank and liability. The contractors I have spoken with say that the tank is not large enough to put divers in. The dimensions are approximately 25 -30 foot diameter, and approximately 25-30 feet in height. Then the contractors say due to the age of the tank there is a liability they are not willing to take on. One contractor suggested finding a company that uses drones. Any suggestions on how to proceed? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe Is there a secondary marketplace for selling halon for a decommissioned system? Where's the best place to start when looking to sell halon tanks?
Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe A liquid storage tank rupture results in a fire containing an open 45 gallon (130 kg) tank containing animal fat. Using gross heat of combustion, estimate the time it would take to burn the remaining fuel without interruption if the tank is half filled and the fire is approximately 2.45 MW. a. 1.2 seconds b. 11 minutes c. 18 minutes d. 17.6 hours Solution | Posted 08/06/19
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Is there a one-stop resource that shows selection of concrete anchors, steel clamps, and wood attachments for use with sprinkler systems?
Much of the manufacturer's information I have is just on products I've heard about or come across from contractors in the industry (familiar with Erico, Sammy's, Thunderstud, Hilti). If not (and you're a contractor), what manufacturer/brand lines do you use/prefer? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe In a recent discussion on threaded fittings versus welded outlets I heard that there's hanger implications - where a hanger is required for every piece of sprinkler pipe.
I'm not a designer so I apologize if this is an awful question, but is a hanger required for every stick of fire sprinkler pipe? If there's short stubs to change direction on a branch line I would think the hanger spacing would be adequate, but I figured I'd ask the pros. Thanks in advance. Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe A mid dermal, or full-thickness skin burn of 700 μm would be classified as a burn of what degree? a. 1st degree b. 2nd degree c. 3rd degree d. 4th degree Solution | Posted 08/02/19
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