7 Controlling Utilities And Building Systems

Question 1

Natural Gas control valve configuration for larger occupancies

Answer 1

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

Question 2

In many large industrial properties, gas meters are located where

Answer 2

Inside underground vaults or in utility rooms inside building.

Question 3

Dot erg recommended distance from possible Bleve

Answer 3

At least 1/2 mile

Question 4

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

Answer 4

Side of tank or in manifold box at the end

Question 5

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

Answer 5

Controlled from central manifold location

Question 6

Oil tanks may be mounted above ground on stanchions to increase

Answer 6

Flow pressure from gravity

Question 7

Jurisdictions usually require above ground oil tanks be protected by

Answer 7

Surrounding with earthen dike or other containment means

Question 8

Bleve in a fuel oil tank is

Answer 8

Not common but possible

Question 9

Oil pressure in boiler atomizer for maximum efficiency

Answer 9

600-1000 psi

Question 10

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

Answer 10

Crimp line. With pliers or hydraulic tool

Question 11

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

Answer 11

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

Question 12

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

Answer 12

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

Question 13

Dot erg recommended staging distance for gas leak

Answer 13

160-330 feet

Question 14

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

Answer 14

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

Question 15

A perimeter should be marked with

Answer 15

Caution or fire line tape.

Question 16

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

Answer 16

Law enforcement

Question 17

Most common fuel control problem faced during structure fire

Answer 17

Securing gas utility

Question 18

One way of establishing a control zone for gas leak

Answer 18

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

Question 19

Natural gas leas should be metered at what elevation

Answer 19

Waist high and up

Question 20

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

Answer 20

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

Question 21

Control zone perimeter is generally established where

Answer 21

a point at which the first detectable reading appears.

Question 22

Lpg monitoring should be taken at what elevation

Answer 22

Close to the ground.

Question 23

Lpg may leak as a white cloud if

Answer 23

Humidity is high enough

Question 24

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

Answer 24

Underground

Question 25

Isolation of ignition sources during gas leak

Answer 25

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

Question 26

Two most common electrical emergencies

Answer 26

House fires

Downed wires

Question 27

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

Answer 27

Near the main electrical panel

Question 28

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

Answer 28

There may be multiple subpanels

Question 29

Large commercial breakers or switches can cause what when opened

Answer 29

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

Question 30

While securing industrial power service, ff must rely on who

Answer 30

Service and maint personnel from industrial site

Question 31

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

Answer 31

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

Question 32

Establishing a perimeter around downed lines may be as simple as

Answer 32

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

Question 33

Recommended isolation distance in downed wires

Answer 33

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

Question 34

Alternating current detectors

Answer 34

Tac sticks / hot stick

Question 35

With an AC current detector, the range is dependent on

Answer 35

The line voltage

Question 36

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

Answer 36

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

Question 37

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

Answer 37

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

Question 38

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

Answer 38

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

Question 39

When water fills a basement it can cause

Answer 39

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

Question 40

Shutting off building water service can

Answer 40

Stop sprinklers and standpipes, leading to fire spread

Question 41

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

Answer 41

Sprinkler heads Plugged and water turned back on

Question 42

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

Answer 42

Shut off asap

Question 43

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

Answer 43

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

Question 44

Water main shut offs to residences are usually located

Answer 44

Between water meter and building or between well service and building

Question 45

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

Answer 45

Sub surface gate valves located in the street or sidewalk.

Question 46

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

Answer 46

Damage to the main

Question 47

Water hammer and seismic events can cause

Answer 47

Rupture of plumbing

Question 48

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

Answer 48

Insulation in walls and ambient noise

Question 49

First indication of water leaks are often

Answer 49

Lights failing or flickering, thermostat not responding.