Pumping and aerial apparatus pt 2

Self priming pump that uses a piston or interlocking rotors to move a given amount of fluid with each stroke or rotation. Used on hydraulic pumps for aerials and for priming pumps on centrifugal fire pumps.

Modern fire pumpers are equipped with ? Pumps as their main fire pump

Two types of positive displacement pumps

? Pumps operate using a piston moving back and forth in a cylinder. These multi cylinder pto driven pumps can provide pressures up to ? Psi for high pressure fog lines.

From the standpoint of design ? Type pumps are the simplest of all fire apparatus pumps

2 types of rotary pumps

One of the most common types of pumps used to prime a centrifugal fire pump

Spiral divergent champed of a centrifugal pump in which the velocity energy given to the water by the impeller blades is converted into pressure

2 basic types of centrifugal pumps

Pumps that use a single intake impeller and a single casing to provide flow capacities up to 2,250 gpm

Pumps that can pump in series (pressure) or in parallel (volume) positions

Many power operated transfer valves operate at pressures as high as ? Psi

When pumping in series (pressure) position the first impeller/stage increases the pressure and discharges ?-?% of the volume capacity through the transfer valve into the second impeller

? Seals are the most common type in use today

In older fire pumps with packing rings in order to prevent overheating a spacer called a ? Or ? Is used with packing to provide cooling

According to NFPA 1901 pumpers with a capacity of 500 gpm or less should have piping capable of flowing ? Gpm. Pumpers with capacities greater than 500 gpm should be capable of at least ? Gpm

Pumps rated greater than ? Gpm may require more than one large intake connection at each location

Pumps rated with a capacity greater than 750 gpm must have at least ? 2&1/2” intakes pumps rated less than that are required to have ?

A minimum of ?” Piping valves and elbows must be used to supply discharges where 1&1/2”, 1&3/4”, or 2” hand lines are attached

All valves should be designed to operate at pressures up to ? Psi

Per NFPA 1901 apparatus equipped with tanks of less than 1,000 gallons must have a tank fill line of at least ?”. Tanks greater than 1,000 gallons must have atleast a ?” Tank fill

Most common type of valve

NFPA 1901 requires all intakes or discharges greater than ?” Be equipped with slow acting valve controls preventing movement from open to closed in less than ? Seconds

Auto pressure controls must operate within ?-? Seconds after discharge pressure rises and restricts pressure from exceeding ? Psi above set level

Most common relief valve uses a ?? Pilot valve

It is generally recommended that intake relief valves be set to open when intake pressure rises more than ? Psi above necessary operating pressure

Cavitation protection part of an electric governor returns an engine to idle when intake pressure drops below ? Psi

Generally the preferred engine speed for priming is ?

What kind of primer works best at low rpm/ idle

Master intake gauges are typically calibrated from ?-? Psi positive pressure and ?-?” Mercury for vacuum

When the vacuum reading on master intake gauge approaches ? Inches the pump is nearing capacity.

Gauge that indicates both the amount of electrical current being drawn from and provided to the vehicles battery. Indicates the status of the alternator

Another work for a throttle knob on pump panel

Two types of auxiliary coolers usually on older apparatus

Medium diameter hose

When pump is connected to hydrant and not flowing water the pressure shown in intake gauge is the ? Pressure

When flowing water the pressure reading in the intake gauge shows the ? Pressure

When using percentage method to determine how much more available water is in a hydrant 10% or less allows ? More lines of the same flow to be added. 11-15% allows ? More and 16-25% allows ? More

Formula for percentage method when determining how much more available water is in a hydrant

Each time the flow rate is doubled the pressure drop in the system is ?

Most pumps are able to develop a vacuum capacity of approximately ? “ mercury

When using a strainer it is best to have atleast ?” Of water all around the strainer

Low level strainers are designed to operate in pools or porta tanks and capable of drafting water down to a depth of approximately ?”

When drafting water temps below ? Or above ? May impact the ability of a pump to reach capacity

The most important part of choosing a draft site is

All pumps meeting NFPA requirements are rated to pump their capacities at ?’ Of lift

A pumped in good working order can lift water a max of ? ‘ however this leaves little capacity left in the pump for operations. To create an effective fire stream a lift of no greater than ?’ Is recommended . Working with this lift allows the pump to operate at ? % capacity

When drafting using a 2 stage pump the transfer valve should be in the ?/? Position

As air is evacuated from the pump intake gauge will register a vacuum reading. This reading should equal 1” of mercury for ?’ Of lift required

The entire priming action typically takes ?-? Seconds and under worst case scenario as long as ? Seconds

The most common failure to prime is caused by?

The most common cause of an air leak in drafting is?

Once prime is established and throttle is opened till pressure is ?-? Psi, open desired discharge valve slowly while observing discharge pressure. If pressure drops to below ? Psi pause to let everything stabilize before continuing

A ?? Is another method which uses the Venturi effect to achieve water movement when drafting

The most common source of problems while operating at draft is ?

If no specific information is available a general guideline is to discharge ? Psi to a FDC

Pressure loss for flows exceeding 250 gpm in a standpipe

Pressure reducing valves in stand pipes usually set to ?

An external standpipe using hose should be secured inside at every ?-? Floors

Difference between elevation between the surface of the static water supply and the center of pump intake

A ? Vacuum is impossible to create using fire service equipment

The greatest height to which any amount of water may be raised through an intake hose to the pump

In most circumstances max lift is ?

Formula determining max lift

Scientific height a column of water may be lifted by atmospheric pressure in a true vacuum at sea level this height is ?

Height a column of water may be lifted in sufficient quantity to provide an effective fire stream

Every fire pump properly operating should have a dependable lift of at least ?

All fire department pumping apparatus are rated when drafting with a minimum lift of ?’ From center of pump through ?’ Of hard intake hose with a strainer submerged at least ?’ In a supply at least ?’ Deep the pump may only deliver ?% capacity of lift is increased by 5’ to a total lift of ?’ And ?% capacity with a lift of ?’

Floating pumps can develop and maintain flows up to ? Gpm

Floating strainers may be used in depths as low as ?’

Cisterns typically range from ?-? Gallons