How many gpm does a master stream flow?

How many gpm does a master stream flow?

A master stream is basically defined as a heavy-caliber stream delivered through a master stream water delivery appliance. A master stream is used when flows surpass 350 gallons per minutes (gpm), becoming too difficult to be delivered from a handline operation because of nozzle reaction.

How do you calculate gpm of a fire?

Example: For a 30′ x 50′ building that’s 25 percent involved, the flow would be 30 x 50 = 1,500 square feet, divided by 3 = 500 x 0.25 = 125 gpm. Based on that required fire flow, one handline pumped at the correct pressure should be able to produce the required gpm.

How do you calculate fire pump discharge pressure?

Net Pump Discharge Pressure (NPDP) Is the end result of hoseline calculations. It is equal to Nozzle Pressure + Friction Loss in the hose + Friction loss in Appliances + Pressure due to Elevation Changes. Nozzle Pressure (NP) The amount of pressure required at the nozzle to produce an effective fire stream.

What is the minimum gpm flow on an interior fire attack line?

150 gallons per minute
On a large scale, the American fire service has adopted a minimum initial attack handline flow of 150 gallons per minute (gpm) for an aggressive interior attack in residential structure fires.

What is a master stream in firefighting?

The use of a truck-mounted master stream is usually thought of for defensive fire operations. This large water cannon can be used for more than just a defensive fire—it can be used for a quick offensive attack from the outside before crews go in and suppress the fire with regular-sized hoselines.

What is the fire flow formula?

National Fire Academy Formula Required fire flow (gpm) = (length x width) ÷ 3. Using the same example, an IC arrives at a burning mercantile occupancy that measures 50 feet by 75 feet and is one story tall.

What is fire flow calculation?

Fire flow = length X width ÷ 3 This formula is most easily applied if the estimated square footage of the entire structure is used to determine an approximate fire flow for the total structure and is then reduced accordingly for various percentages of fire involvement.

What pressure do you pump a master stream?

Master Stream Devices: Nozzle Pressure + 10 PSI for the device. Older devices with multiple intakes and stream straightener Nozzle Pressure + 20 PSI.

What is pump discharge pressure equal to?

4.3 Compressor discharge pressure Compressor discharge pressure (which is equal to the condenser pressure) is dictated by the condensing temperature, except for R744.

What is the recommended minimum size of an attack hose line?

3 1/2″
NFPA 1961 mandates that supply hose have a minimum 3 1/2″ internal diameter. No minimum or maximum size is specified for attack hose, but for reasons we’ll discuss soon, these hoses tend to be smaller than supply hoses.

What is the minimum flow GPM that NFPA 1710 recommends for any single attack line operating at a commercial structure fire?

300-GPM
NFPA #1710*, states that the initial arriving companies should be able to establish an initial fire flow of 300-GPM from two hand lines, each of which should have a minimum flow rate of 100-GPM. While this can be done with 1-3/4” hose, you will need some practice and extra folks to make it work at 150-GPM each.

What’s the maximum pressure on a master stream nozzle?

At pressures other than 100 psi, maximum flow is determined by K-factor of 150. This series is the only variable pressure nozzle with a flow range of 600 – 4000 gpm (2400-16000 l/min). The Master Stream 4000 features a unique user selectable operating pressure control.

How is the GPM flow from a smooth bore determined?

The amount of water discharging from a smooth bore is determined by the nozzle pressure and the inside diameter of the opening. The formula for determining the gpm flow from a smooth bore nozzle is as follows: 29.72D2√P (D = nozzle diameter; √P = square root of pressure)

How is a fire stream affected by the nozzle?

By definition, a fire stream is a stream of water after it leaves the nozzle until it reaches its final destination, which is usually the seat of the fire. As the streams are being produced, they are affected by the discharge pressure, nozzle design, and nozzle setting.

How big of a volume can a masterstream stream produce?

The series has the ability to produce an excellent hard-hitting stream at any volume from 300 gpm to 2000 gpm ( 1100 – 8000 l/min). It is adjustable from a straight stream to a dense fog pattern.