7 Controlling Utilities And Building Systems Flashcards

1
Q

Natural Gas control valve configuration for larger occupancies

A

May be on horizontal or vertical feed to meter, maybe rectangular quarter turn, may be larger square nut turned with wrench.

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2
Q

In many large industrial properties, gas meters are located where

A

Inside underground vaults or in utility rooms inside building.

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3
Q

Dot erg recommended distance from possible Bleve

A

At least 1/2 mile

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4
Q

On large fixed installation horizontal lpg tanks, control valves may be located where

A

Side of tank or in manifold box at the end

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5
Q

Where lpg tanks are grouped together horizontally, the flow may be controlled fro. Where

A

Controlled from central manifold location

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6
Q

Oil tanks may be mounted above ground on stanchions to increase

A

Flow pressure from gravity

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7
Q

Jurisdictions usually require above ground oil and to be protected by

A

Surrounding with earthen dike or other containment means

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8
Q

Bleve in a fuel oil tank is

A

Not common but possible

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9
Q

Oil pressure in boiler atomizer for maximum efficiency

A

600-1000 psi

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10
Q

If the oil tank gate vale is inoperable or inaccessible how can you stop flow of oil

A

Crimp line. With pliers or hydraulic tool

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11
Q

During white ghost (amazed fuel oil atmosphere) emergency what should be done

A

Evac building, shut off emergency power switch, vent, eliminate ignition sources, avoid entering vapor cloud

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12
Q

Approaching scene of possible leak in apparatus should be done from where

A

Upwind, apparatus is possible ignition source. Stage as much as a block away

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13
Q

Dot erg recommended staging distance for gas leak

A

160-330 feet

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14
Q

In determining a perimeter distance, a safe distance is a judgement made by who

A

By the IC based on information gathered and accurate assessment of hazard.

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15
Q

A perimeter should be marked with

A

Caution or fire line tape.

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16
Q

If firefighters established the initial perimeter, who should they pass control of the perimeter to asap

A

Law enforcement

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17
Q

Most common fuel control problem faced during structure fire

A

Securing gas utility

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18
Q

One way of establishing a control zone for gas leak

A

Move with cgi from a point with no readings toward suspected leak sampling at frequent intervals until reading registers.

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19
Q

Natural gas leas should be metered at what elevation

A

Waist high and up

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20
Q

Since the lel for NG is at 5 percent, many fire departments establish a perimeter at

A

10% of that figure, 0.5%, but lel propane is 1.5% so it should be no more than 0.15%

21
Q

Control zone perimeter is generally established where

A

a point at which the first detectable reading appears.

22
Q

Lpg monitoring should be taken at what elevation

A

Close to the ground.

23
Q

Lpg may leak as a white cloud if

A

Humidity is high enough

24
Q

Firefighters are generally able to shut of gas at outside control valves and meters but not

A

Underground

25
Q

Isolation of ignition sources during gas leak

A

Work from outside in, eliminating ignition sources and turning off gas service, putting out the pilot light as a result.

26
Q

Two most common electrical emergencies

A

House fires

Downed wires

27
Q

Turbine and photovalic solar panel service shut offs are most likely located where

A

Near the main electrical panel

28
Q

Finding the right electrical switch in a commercial occupancy may be difficult because

A

There may be multiple subpanels

29
Q

Large commercial breakers or switches can cause what when opened

A

An arc, possible ignition source, or damage eyes while looking at it

30
Q

While securing industrial power service, ff must rely on who

A

Service and maint personnel from industrial site

31
Q

If the amount of downed wires taxes a departments resources, how can they be managed

A

By condoning off the area and moving on to the next wires down

32
Q

Establishing a perimeter around downed lines may be as simple as

A

Placing traffic cones around the hazard zone to direct people and motor vehicles around

33
Q

Recommended isolation distance in downed wires

A

One full span between adjacent poles or towers in all directions from point of contact with ground.

34
Q

Alternating current detectors

A

Tac sticks

35
Q

With an AC current detector, the range is dependent on

A

The line voltage

36
Q

Under ideal conditions ac detectors can detect a single 120 v line from as far as

A

15 feet away, but if on wet soil as little as 1 ft

37
Q

Circuit breakers for power substations will reset several times during service interruptions resulting in

A

Intermittent loss and and energizing, causing misleading indication of dead power line

38
Q

A thermal imaging camera can be used to detect downed wires because of

A

The thermal energy generated from the electrical resistance of the wire touching something.

39
Q

When water fills a basement it can cause

A

Short circuit of electrical outlets and services, and extinguish pilot lights

40
Q

Shutting off building water service can

A

Stop sprinklers and standpipes, leading to fire spread

41
Q

Sprinkler systems can be shut off after fire control efforts and then

A

Sprinkler heads Plugged and water turned back on

42
Q

Unless the water supply in a sprinkler system is contributing to fire suppression efforts, it should be

A

Shut off asap

43
Q

The only reason to delay shutting off a sprinkler system at the appropriate time is

A

Due to resource limitations and other, higher, fire ground priorities.

44
Q

Water main shut offs to residences are usually located

A

Between water meter and building or between we’ll service and building

45
Q

In larger multiple residence buildings and other large buildings, main water valves are often

A

Sub surface gate valves located in the street or sidewalk.

46
Q

If a sub surface valve is closed too quickly, it can cause

A

Damage to the main

47
Q

Water hammer and seismic events can cause

A

Rupture of plumbing

48
Q

Water leaks in houses can go undetected for a while because of

A

Insulation in walls and ambient noise

49
Q

First indication of water leaks are often

A

Lights failing or flickering, thermostat not responding.