Chapter 9 - Pump Operations from Pressurized Sources

NFPA 1900 requires pumpers to have a feature that prevents the pump from throttling up if:

The parking brake is not set

When midship transfer case-driven fire pumps are engaged:

The speedometer will show some speed at idle

NFPA 1900 requires internal (booster) tanks to supply pump capacity for ___ of its volume

80%

Cavitation of a fire pump results from a situation known as:

Overpumping

During cavitation, water turns to vapor in the:

Impeller eye

A sign of pump cavitation is:

Intake pressure below zero

A tactic that uses a portable or fixed master stream and water from the internal tank is the:

Blitz attack

At idle, the D/O must see whether the master discharge gauge reads approximately:

50 psi (350 kPa)

There are several possible solutions if the D/O cannot obtain proper discharge, including cracking open a discharge, such as tank fill, or:

Activating the primer

The PDP sometimes needs to be higher than the individual discharges, such as when:

Individual discharge pressures are low

The pump may overheat if water is ___ for an extended period of time

Deadheaded

When transitioning from tank water to an external water supply, after the supply hose is attached, the D/O will:

Open the intake bleeder valve

When transitioning to a pressurized water source, the manufacturers of pressure governors recommend that they be set to:

Pressure mode

When pressure from the hydrant hits the pump, an electronic governor will:

Quickly decrease engine speed

When operating a two-stage pump and switching from series (pressure) to parallel (volume), the D/O will have to:

Reduce throttle

The D/O should maintain residual pressure on their master intake gauge of at least ___ during pumping operations that utilize positive pressure hydrants

20 psi (140 kPa)

Loosened sediment and debris in older water pipes, which can lead to pipe collapsing or reduced water flow, is a result of:

Overtaxing the water system

When filling an internal water tank from a hydrant, the D/O must be mindful of the tanks:

Maximum pressure

The least desirable hydrants for use:

Are located on dead-end water mains

A common practice in residential areas involves placing fire hydrants every:

500 ft (150 m)

Before connecting the intake hose to the hydrant, personnel should:

Open the hydrant briefly and flush debris

Regardless of their location, design, or type, hydrant discharge outlets are classified as standard if they contain:

At least one large (4-4.5in [100-115mm]) outlet and two hose outlets for 2.5in (65mm) couplings

Hydrant specifications require a 5in (125mm) valve opening for standard 3-way hydrants and a ___ connection to the water main

6in (150mm)

According to NFPA standards, personnel should inspect and operate fire hydrants at least:

Annually

A supply hose layout where the pumper drops one end of the hose at the hydrant and proceeds to the fire location is a(n):

Forward lay

A supply hose layout where the pumper drops one end of the hose at the fire and proceeds to the water source is a(n):

Reverse lay

An advantage of using a 4-way hydrant valve is that it allows the water supply pumper to:

Release from the hydrant when the water demand diminishes

The term used to describe one of several hose lays using a single engine with a split hose bed, such as forward lay followed by a reverse lay, is the:

Combination lay

The D/O should make changes in flow slowly and smoothly to avoid:

Water hammer