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23 Cards in this Set
- Front
- Back
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Automatic Pressure Control Devices
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NFPA requires devices to operate within 3-10 seconds with no more than 30 psi rise
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Relief Valves
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Operate by difference in surface area pressure.
Tension is added to a spring and piston which holds back the discharge pressure When the discharge pressure overcomes the spring tension a water way opens allowing a pressure difference on the valve between the discharge manifold and the pump intake Discharge relief valves Spring controlled pilot valves Alternative relief valves Intake relief valves Factory supplied Add-on device |
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Waterous Discharge Relief Valve
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Operates in on or off positions and has a removable strainer
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Pressure Governor
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Regulates by mechanical or electronic means
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Automatic pressure control devices
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NFPA requires devices to operate within 3-10 seconds with no more than 30 psi rise
|
|
|
Relief Valves
|
Operate by difference in surface area pressure.
Tension is added to a spring and piston which holds back the discharge pressure When the discharge pressure overcomes the spring tension a water way opens allowing a pressure difference on the valve between the discharge manifold and the pump intake Discharge relief valves Spring controlled pilot valves Alternative relief valves Intake relief valves Factory supplied Add-on device |
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Waterous Discharge Relief Valve
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Operates in on or off positions and has a removable strainer
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Hale Relief Valve
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Operates in the "on" position only.
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Pressure Governor
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Regulates by mechanical or electronic means
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Pressure Control Governors
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When activated, the governor
Uses trapped air & water in area A as a reference pressure for the piston that controls the engine throttle. A change in pump pressure affecting area B moves the piston adjusting the engine pressure. |
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Intake Relief Valve
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see schematic
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Piping
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Corrosion resistant, and made of cast iron, brass, stainless steel, or galvanized steel
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Intake Piping
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Tank Water: Most fires can be extinguished. 500 gpm or less should flow 250 gpm. Greater than 500 gpm, flow at least 500 gpm
External Water: Primary piping is large diameterRound near the intake |
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Intake Screens
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Zinc die cast screens are normally used in the intake fittings, with brass screens available optionally. Although the screens are chemically treated (coated) to inhibit corrosion, the water being pumped may still corrode the screens. Such corrosion is
“sacrificial”; that is, it will help prevent corrosion in the rest of the pump the same way the magnesium anodes protect the metal parts of a water heater |
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Discharge piping
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250 gpm per 2 ½” Outlet i.e.: KME’s have 5 2 ½” discharges equaling 1250 rating. Smaller outlets used for preconnects. Tank fill lines should be provided
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Zinc Anodes
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Sacrificial metal welded to the discharge piping usually near the ends of discharges that react with the water and break down instead of the piping.
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Tank to Pump:
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One 4” tank to pump line will be, piped through the front bulkhead of the tank with a 90 degree elbow down into the tank sump. This line will be plumbed directly into the rear of the pump suction manifold for maximum efficiency
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Tank Fill:
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One 2” gated full flow pump to tank refill line controlled at the pump panel will be provided. A deflector shield inside the tank will be furnished. Tank fill plumbing will utilize 2” wire braided hose for tank connection to accommodate flexing between components.
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Auxiliary Cooling Systems:
Marine Immersion |
Marine type – inserted inline of one of the hoses used in the engine cooling system in a way that he engine coolant must travel through fire pump fluid as it circulates through the system. The cooler itself contains a number of small tubes similar to the flues in a steam boiler, that carry the coolant.
Immersion type - the engine coolant passes through the body of the cooler and around, water being supplied by the fire pump passes through a coil or tubing mounted inside the cooler so that it is immersed in the coolant causing heat exchange |
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Valves:
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should permit flow with minimum friction.
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Pump drains:
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Relieves pressure
Drain lines used to drain water during freezing |
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Master Intake & Discharge Gauges
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Master Intake Gauge
Measures positive & negative Calibrated 0-600 psi positive, 0-30 inches negative Provides information of water available & vacuum Master Pump Discharge GaugeRegisters pressure leaving the pump |
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Gauges
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Compound gauge – A gauge connected to the intake side of the pump that is capable of measuring positive & negative intake pressures.
Discharge/pressure gauge – A gauge on the discharge side of the pump that registers the pump discharge pressure |
