In the case of master stream nozzles, the standard pressure is 80 psi. Unfortunately, the deck gun discharge gauges on fire apparatus do not take their pressure readings at the tip or even at the base of the master stream nozzle.

How much GPM is a deck gun?

The deck gun might be a regional term, I have also heard it called the monitor, or the “Stang”, but we are talking about the engine mounted master stream. Most engine mounted master streams, fog, or a stack of smooth bore tips have a flow range of 500 to 1000 GPM.

How much psi do I need for master stream?

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

How much water does a deck gun use?

A deluge gun can discharge 2,000 US gallons (7,600 liters) per minute or more. A master stream is a fire service term for a water stream of 350 US gallons (1,300 liters) per minute or greater. It is delivered by a master stream device, such as a deck gun, deluge gun, or fire monitor.

How far can a deck gun shoot?

The best use of the deck gun on interior fires is on first- and second-floor fires with the apparatus placed 25 to 30 feet from the building. Deck guns can be very useful at advanced fires inside one particular type of occupancy, the ground-floor store.

Can you convert PSI to GPM?

PSI can’t be directly converted to GPM; these are two different units of measure. PSI measures pressure and GPM measures flow rate. But if other variables are known, the water’s flow rate in GPM can be calculated with the help of the Bernoulli equation for incompressible fluid and careful unit conversion.

How much does a 15/16 tip flow?

A 15/16” might not be best because the lowest it flows in the operating range of 40-60 PSI is 165 GPM, but to keep a 150 GPM target flow you could under pump the 7/8” to 45 PSI NP and get 152 GPM.

What do you pump a booster line at?

When to pull it The limited fire flow from a booster line, generally around 50 to 60 gpm, was usually sufficient for a small fire.

What do you pump a master stream at?

Note that the standard rule is to use a pressure of 80 psi for a smooth bore tip nozzle in master stream operations. Higher pressures will create a broken and insufficient stream and an unstable operation in the elevated and portable modes, according to most fire stream books.

How much friction Do appliances lose?

In situations where total gpm is less than 350 gpm, the friction loss is insignificant. If total gpm is greater than 350 gpm, add 10 psi for friction loss in the appliance. Master stream appliances flowing at rated capacity use 25 psi per appliance.

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What do you pump a smooth bore nozzle at?

The operating pressure of the smooth bore is a range from 40 to 60 pounds per square inch (psi), with 50 psi as optimal.

What is a gated wye?

Permits complete flow control when a hose line needs to be split into two lines or when two lines are combined into one hose line.

What is a monitor nozzle?

1. A nozzle capable of turning completely round in a horizontal plane and having a limited play in a vertical plane, used in hydraulic mining, fire-extinguishing apparatus, etc.

What is a chafing block designed to do?

Chafing blocks are another piece of protective equipment for your LDH, particularly for lines coming into or going out of the fire apparatus pump. The vibration from the pump and the running apparatus motor create an abrasive action that’s damaging to LDH.

How many GPM is a 5 32 nozzle?

Typical sprinkler flow rates may vary from 4 gallons per minute (gpm) from a 5/32-inch nozzle at 30 pounds pressure to over 11 gpm from a 7/32-inch nozzle at 70 pounds pressure. The nozzle size is usually stamped on the side of the nozzle.

How much water can a 3/4 pipe flow?

Assume Average Pressure (20-100PSI). About 12 f/s flow velocityPipe Size (Sch. 40)I.D. (range)GPM (w/ min. PSI loss & noise)1/2″0.5 – 0.6″143/4“0.75 – 0.85″231″1 – 1.03″37

What is more important PSI or GPM?

GPM is usually more important to contractors than PSI. Since most contractors use cleaning chemicals to do all of the cleaning, their job becomes one primarily of rinsing the dirt away.

How many PSI are in a gallon?

Pound/gallon (US)Psi/1000 Feet1 pound/gallon (US)51.948051948 psi/1000 feet2 pound/gallon (US)103.896103896 psi/1000 feet3 pound/gallon (US)155.844155844 psi/1000 feet5 pound/gallon (US)259.74025974 psi/1000 feet

What is the difference between GPM and PSI?

The PSI refers to the amount of pressure produced and GPM refers to the amount of water flow. … PSI (Pounds per Square Inch) refers to the amount of cleaning pressure the machine can produce. GPM (Gallons per Minute) is the amount of water that is coming from the machine.

What pressure do you pump a cellar nozzle?

All distributor nozzles should be operated at 100-PSI nozzle pressure to provide maximum volume and reach.

What is the pump discharge pressure?

Fire Engine Pump Discharge Pressure (PDP) is the pressure set at the pump to achieve the desired pressure at the nozzle furthest from the pump (while considering the change in elevation and friction loss). Having a good understanding of pump discharge pressure is essential to becoming an effective fire engine operator.

Which is an advantage of the horseshoe hose load?

Arrangement of fire hose in bed or compartment in which the hose lies on edge in the form of a horseshoe. Horseshoe load. What is the primary advantage of the horseshoe load? It has fewer sharp bends than the accordion or flat load.

How much pressure does a fire truck need?

Most fire pump discharges require 120-200 psi of pump discharge pressure for hose lines, nozzles and appliances. Low pressure nozzles allow for lower pump pressures to deliver the same flow rates. Water supply lines may require as little as 40-50 psi of engine pressure, up to 185 psi for large diameter supply hose.

What is soft suction?

Commonly accepted term for short length of large diameter soft hose used to connect a structural or wildland engine with a hydrant. No vacuum is involved because the hose is useful only when the engine receives water at a rate of flow in excess of the demand of the pump.

What does a lower coefficient of friction mean?

The coefficient of friction, µ, is a measure of the amount of friction existing between two surfaces. A low value of coefficient of friction indicates that the force required for sliding to occur is less than the force required when the coefficient of friction is high.

What psi do you pump a standpipe?

In buildings constructed after 1993, NFPA 14 requires standpipe outlets to flow a minimum of 250 gpm at, as mentioned previously, a minimum pressure of 100 PSI.

Why does FDNY use smooth bore nozzles?

The solid-stream nozzle is able to extinguish the fire and to cool the surfaces and the surrounding areas sufficiently to reduce the heat without producing the large rapidly expanding volumes of steam. This significantly prevents steam burns.

What is an advantage of a smooth bore nozzle?

Smooth bore nozzles outperform fog nozzles in that they have more operational benefits, which include: greater reach and better penetration. less nozzle reaction except for the 50-psi fog nozzle. less likelihood of being clogged by debris.

What is a Siamese valve?

A siamese connection or splitter in fire protection engineering is a pipe fitting that allows two or more fire hoses to be connected to a single standpipe riser at the same general location. It is so-called due to the visual similarity to siamese twins.

What is a Wye valve?

Our wye valves are designed to divide one stream of water into two. They’re equipped with a female swivel inlet and two rigid male outlet connections. Specifications: Material: Brass.

Can you move an aerial ladder while flowing water?

It is absolutely safe to assign firefighters to the tip of the ladder during aerial master stream operations. Most aerials are rated for 500 pounds while flowing water. It is also acceptable to raise lower and rotate while a firefighter is on the tip. Such operations will typically be slow movements.