Pump Ops Chpt 11 Flashcards Preview

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Flashcards in Pump Ops Chpt 11 Deck (32):

_____ is the difference in elevation between the surface of the static water supply and the center of the pump intake.



The maximum height of the _____ is affected by the angle of the intake hose, but the amount of negative pressure that the priming device can produce, and the existing atmospheric pressure.



For every 1000 feet of altitude, the atmospheric pressure decreases by approximately

0.5 psi


Can be calculated by determining the actual atmospheric pressure of an area and multiplying that number by the water's pressure per square foot while it is in the intake hose.

Theoretical lift


A _____ is not attainable using a fire department pumper, meaning that pumpers cannot be expected to draft water that is located 33.9 below the level of the pump.

Total vacuum


In the fire service, ______ is defined as the greatest height to which any amount of water may be raised through an intake hose to the pump.

Maximum lift


In most circumstances, maximum lift is approximately _____.

25 feet


Determining Maximum lift

L=1.13 Hg

L height of lift

1.13 a constant

Hg inches in Mercury


Generally, you will be more concerned with the the concept of _____ the height a column of water may be lifted in sufficient quantity to provide a reliable fire flow.

Dependable lift


All fire department pumping apparatus are rated when drafting with a minimum lift of ____ from the center of a pump intake to the surface of water through 20 feet of hard intake hose.

3 feet


A strainer is submerged at least 2 feet in a water depth of at least 4 feet. As the lift or friction loss in hard intake hose is increased, the water supply capability of the pump decreases. The pump may only deliver about __ of its rated capacity if the lift is increased by 5 feet, to a 15 foot lift, and ___ at a 20 foot lift.

70 percent

60 percent


Many communities feature public boat launches that provide excellent ________. In some jurisdictions, fire departments oversee construction of gravel drives and dry hydrants wot create adequate water supply availability.

Drafting access


When drafting from a natural water supply source, it is especially important that all intake hoses have a ______ attached and supported so that it does not rest on or near the bottom of the supply source. A ladder may be used to achieve this position.



If an adequate draft cannot be established due to clogging at the strainer, _____ with tank water may help to dislodge the debris

Back flushing


In order to help avoid problems with silt and debris, jurisdictions may install _______ at favorable drafting locations.

Dry hydrants s


Most fire departments use a chain saw, _____, axe, or a combination of tools to breach the ice.

Power auger


A _____ is an underground water storage receptacle that is usually found in area not serviced by a hydrant system.



Although they vary in size, _______typically range from 10,000 to 100,000 gallons.



Are artificial installations that have similar characteristics as a pond or lake. They may be found on large commercial or industrial properties as well as municipal water treatment facilities.

Ground reservoirs


Formula: square rectangular pool capacity

C = 7.5xLxWxD


Formula for round pools

C = 7.5 x 3.14x r2x D


In some jurisdictions may flow in excess of 1000 gpm mad may function as a potential water source for fire protection.

Agricultural irrigation systems


When evaluating a potential water supply source, first determine its

Adequacy and accessibility


A major factor in determining the usability of a static water source is the ability of fire apparatus to _______ an effective drafting operation at the site

Access and set up


Floating pumps placed in an adequate water source can develop and maintain a flow of up to

500 gpm


Some jurisdictions employ a _____ that allows the utilization of static water supplies that are located a modest distance from a fire apparatus

Water eductor


Although lesser depths may be suitable, 2 feet of water all around the ______ is generally considered the minimum for that type of equipment

Barrel type strainer


May be used for water as shallow as 1 foot

Floating strainers


Are most commonly used to draft from portable tanks

Low level strainers


These devices may draw water as shallow as 1 to 2 inches, but generally will not provide the flow required to reach the capacity of the pumping apparatus

Low level strainers


These reservoirs typically contain many millions of gallons of water.

Ground reservoir


Generally supply water via open canals and portable pipes

Irrigation systems