NFPA D/O Mobile Water Supply case studies
NFPA D/O Mobile Water Supply · Put your knowledge to work in context.
The NFPA Driver/Operator - Mobile Water Supply credential verifies that a fire apparatus driver/operator can safely move large volumes of water with tankers and tenders, from pre-trip inspection through fill, shuttle, dump, and relay. It is written for career and volunteer personnel who already drive apparatus and are being assigned to water shuttle roles, often in jurisdictions without fixed water mains. The NFPA D/O Mobile Water Supply case studies are 5 cases and about 3,327 words.
1Tanker Readiness: Air Leak, Creeping Dump Valve, and an Overweight Axle
At 06:40 during the weekly apparatus check, the operator of a 2019 tandem-axle tanker (2,500 gal tank, 1,250 gpm pump, 10-inch rear air-actuated dump valve, 3-inch direct tank fill) finds three symptoms. The rear dump valve has crept open about 1 inch, and the tank gauge reads 2,300 gal although the tank was filled to 2,500 gal the previous evening.
698 words, about 3 min2Downgrade with a Partially Loaded Tanker
A 2,000 gal baffled tanker is responding to a rural fire. The tank is 65% full (about 1,300 gal) because the driver left the fill site early to cover a reported exposure.
668 words, about 3 min3Fill-Site Hydrant Capacity Versus the Shuttle Demand
You are the driver/operator at a fill site for a shuttle that must move 1,000 gpm to the dump site. A municipal hydrant tests static 62 psi and residual 18 psi at 850 gpm, measured with a pitot on the 2.5-inch outlet.
693 words, about 3 min4Dump Site Selection: Soft Ground, Septic Field, and a Posted Bridge
The shuttle incident commander asks you to scout a dump site at the end of a 900-ft gravel driveway. The driveway is 10 ft wide, with soft shoulders after 1.5 in.
629 words, about 3 min5Relay Pumping: Discharge Pressure Is Right, Suction Is Failing
A relay is set up from a pond to an attack pumper 1,400 ft away. The source pumper drafts through 20 ft of 4-inch hard suction with a 12-ft lift.
639 words, about 3 min