Pumping Apparatus Driver/Operator Handbook _____ pumps offer the maximum amount of flexibility Auxiliary engine-driven pumps Auxiliary engine-driven
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[Show More] pumps used on ARFF apparatus and for trailer mounted applications tend to be large capacity pumps of up to 4,000 gpm or more These auxiliary engine-driven trailer mounts are powered by a full size diesel engines and are capable of _____ horsepower or more 500 horsepower In this arrangement, the pump is driven by a driveshaft that is connected to the _______ on the chassis transmission Power take off (PTO) PTO driven pumps are most commonly used on initial attack and wildland and mobile water supply apparatus The conventional PTO unit limits the capacity of the pump to about ____ gpm and limits the available horsepower to approximately ____ 500 gpm and 95 horsepower Some manufacturers provided a PTO with pumps as large as ____ gpm and are most common on modern automatic transmissions where the ____ of the engine drives the PTO unit 1,250 gpm and flywheel A midship pump is supplied to the pump through the use of a ______ gear case located in the drive line between the transmission and the rear axle split-shaft What is the most common type of pump used in the fire service Midship With the transmission turning most apparatus register the engine speed in road mph, With the engine idling and the pump engaged what would the speedometer read between 10-15 mph A hydrostatic pump can be used for both ___ and ____ operations stationary and mobile ( pump and roll ) The primary components of the piping system are intake, discharge, pump drains, and valves NFPA 1901 require all piping system must be of a corrosion-resistant material There are 2 ways water may enter the fire pump 1. through piping that connect the pump and the onboard water tank 2. piping that is used to connect the pump to an external water supply NFPA 1901 states that piping should be sized so that pumpers with a capability of ____ gpm or less should be capable of flowing at ____ gpm 500 gpm should be capable of flowing 250 gpm All modern day pumps are equipped with ___ in the lines to help prevent damage to the tank if the tank-to-pump valve inadvertently opens check valves Intake piping is round in shape at the point where the intake hose connects to it. As the piping nears the pump itself, it typically tapers to a square shape, why This eliminates the vortex that may occur in water that flows through a circular piping Discharge piping at a minimum, all fire apparatus with a rated pump capacity of ____ gpm or greater must be equipped with at least ____ 2 1/2 inch discharges and a pump that is rated less than _____ gpm are required to have at only ____ 2 1/2 inch discharge 750 gpm and at least 2 750 gpm and only have 1 NFPA 1901 requires that apparatus with a water tank that is less than _____ gallons in size have a tank fill line that is at least ____ inch in diameter 1,000 gallons and 1 inch inn diameter What valves is more effective for preventing overheating in a two stage pump circulator valve _____ control most of the intake and discharge lines from the pump Valves The most common type of valve is the _____ that permits full flow through the lines with a minimum of friction loss ball- type valve The most common actuators for ball type valves are either push-pull handles also known as T-handles or quarter-turn handle Newer apparatus may be equipped with valves that are Hydraulically, pneumatically or electronically controlled These are most commonly used on large diameter intake and discharges Gate or butterfly valves NFPA1901 require that all valves on intakes or discharges that are 3 inches or greater to be equipped with slow acting valve control, the purpose of this is to help prevent what water hammer The purpose of drains on the piping in the pump is to release air in the lines and drain any water left in the piping in climates that freeze There are two basic concepts for pressure relief valves those that relieve the intake and those that relieve the discharge pressure One of the most common types used on the discharge side is a spring controlled pilot valve It is generally recommended that intake relief valves be set to open when the intake pressure rises more than ___ psi above the desired operational pressure 10 psi The main feature of a pressure governor is that it regulates the power output of the engine to match pump discharge requirements. Newer apparatus may be equipped with electronic governors. These use a ________ that is cone ted to the discharge manifold pressure-sensing element ( Pressure Transducer ) _____ are so accurate and quick to respond that they virtually eliminate the need for the pump to equipped with a discharge pressure relief valve, but intake pressure relief valves are still needed Electronic governors Successfully drafting water depends upon the ability to create a _____ pressure within the pump and the intake hose that exists in the atmosphere Lower The device that make drafting possible are called _____ priming device Primers fall into 3 categories which are positive displacement exhaust vacuum [Show Less]