Hydraulic Theory Defin

Question 1

Appliance

Answer 1

the generic term applied to any nozzle, wye, siamese, deluge monitor, or any other piece of hardware used in conjunction with fire hose for the purpose of delivering water.

Question 2

Attack Pumper

Answer 2

any pumping apparatus that is supplying water directly to attack lines.

Question 3

Centrifugal pumps

Answer 3

pumps used on all modern fire apparatus. This type of pump takes advantage of incoming pressure. Water enters the eye of the pump then travels through one or more impellers.

Question 4

Discharge

Answer 4

the quantity of water issuing from an opening expressed in gpm

Question 5

Discharge pressure

Answer 5

actual velocity pressure of the water (measured in psi) for an individual hose line

Question 6

Discharge velocity

Answer 6

the rate at which water travels from an orifice and can be measured using a pitot gauge

Question 7

Elevated stream

Answer 7

master stream nozzle attached to or being operated from an aerial ladder.

Question 8

Elevation pressure

Answer 8

gain or loss of pressure in a hose line or system dude to a change in elevation

Question 9

Flow pressure

Answer 9

pressure created by the velocity of water coming from a discharge opening.

Question 10

Friction loss

Answer 10

the loss of pressure created by the turbulence of water moving against the interior walls, couplings, and connections of the hose or pipe.

Question 11

Gutter line

Answer 11

line run directly from a hydrant to an attack pumper

Question 12

Head pressure

Answer 12

water pressure due to elevation. For each foot of elevation above the pump the pressure increases by 0.434 psi.

Question 13

ladder pipe

Answer 13

master stream nozzle mounted to the fly of an aerial ladder

Question 14

Master stream

Answer 14

any variety of heavy caliber water streams delivering 350 gallons or more