Em Procedure Nat Gas

Question 1

What is natural gas comprised of?

Answer 1

Mainly of methane but also contains propane, ethane and nitrogen

Question 2

What classification Haz Mat is natural gas?

Answer 2

Class too, division one substance. Extremely flammable

Question 3

Depending on the mixture, the explosive range is

Answer 3

5 to 15%

Question 4

Colorless and odorless; however to aid in detection ______ is added to natural gas as an odorant giving it a____ smell.

Answer 4

Mercaptan; rotting
Mercaptan can be masked by other orders, stripped by chemicals or removed as natural gas passes through material such as soil. In addition, members operating in a gas environment can become desensitized to the smell

Question 5

Is natural gas lighter than air?

Answer 5

Significantly lighter than air

Question 6

Is natural gas toxic?

Answer 6

Non-toxic, but insufficient quantity natural gas can displace oxygen in and close space and cause asphyxiation

Question 7

2 ft.³ of natural gas has the approximate energy potential of____ of tnt

Answer 7

1 pound

Question 8

When unconfined outdoors, can natural gas explode?

Answer 8

It will burn rapidly without triggering explosive pressure

Question 9

Where are con Edison gas distributes?

Answer 9

Manhattan, the Bronx, and in Queens, generally north of the Grand Central Parkway

Question 10

National grid distribute gas to?

Answer 10

Brooklyn, Staten Island and in Queens, generally south of the Grand Central Parkway

Question 11

Gate stations are facilities that have remote monitoring by the utility company gas control center. Do they have on-site personnel?

Answer 11

Generally have no permanent on site personnel. Any event in these facilities should be considered an industrial facility emergency and actions should be limited to life saving and protecting exposures until the utility company has been consulted

Question 12

Natural gas is piped to customers a long distribution mains which may be high, medium or low pressure. High pressure distribution means are made of?

Answer 12

Steel, and I generally installed below major roads

Question 13

Medium and low pressure distribution means are made of?

Answer 13

Steel, plastic, or if older, cast iron. Cast-iron pipe is currently being replaced as it is prone to corrosion and failure, being brittle with low tensile strength

Question 14

________Pressure distribution mains have control valves that are exercised partially on a schedule to ensure working order. These valves are generally found near street corners, but may also be located along the street or on the sidewalk. Main valve covers are larger than curb valve/service valve covers to allow servicing and may be round or square

Answer 14

Hi and medium

Question 15

Which companies gas Main valves have ID numbers on tags inside the valve cover?

Answer 15

Conedison

Question 16

Which company main valve covers are identified by an ID number stamped on the north side of the collar, underneath the cover;, however, these numbers may be difficult to say

Answer 16

National grid

Question 17

Which distribution means generally do not have valves and isolating sections?

Answer 17

Low pressure 1/4 psi Distribution means generally do not have valves and isolating sections of low pressure distribution mains requires plugging or squeezing off the pipe while still under pressure. Only the utility company can safely plug or squeeze off distribution or service means due to spark hazards

Question 18

Curb valve/service valves are usually found on which side of the curb and these valves shut the gas supply to the entire building? They are usually recessed in from the curb and are covered with What size plate?

Answer 18

Sidewalk side.

4” x 4” square or round, brittle concrete or steel cover which may be sitting on top of plastic or wooden plate

Question 19

Which gas company, has the curb valve/service valve sometimes located across the street from the building at supplies? and may be found in the street. This type of curb valve/service valve can be identified how?

Answer 19

National grid; identified by an arrow cast into the cover pointing to the building and supplies.

Question 20

Some gas service piping supplies gas to the building without having a curb valve or service valve. What is stamped on a tag near the service meter indicating there is no curb valve or service valve?

Answer 20

NC

Question 21

What is stamped on a tag near the service meter indicating an excess flow valve exists in line on the service pipe.

Answer 21

EFV. The EFV should limit or stop excess flow down pressure from it

Question 22

What is another name for a curb valve?

Answer 22

Service valve

Question 23

Exterior Gas service valves control the supply of gas to meters installed where? If an exterior gas service valve is present is there a curb valve/service valve?

Answer 23

Outside of the building. If an Exterior gas service valve is present, no curb valve/service valve is required

Question 24

Head of service valves control the supply of gas to meters where?

Answer 24

Inside of buildings

Question 25

typical house appliance pressure is how much? A few commercial customers receive gas at what psi?

Answer 25

1/4 psi; 1 to 3 psi

There are a small number of large facilities that utilize full line pressure, especially for power generation

Question 26

Service regulators are usually located _______ The gas meter on_________ Systems to reduce gas flow to low pressure (1/4 psi)

Answer 26

Before; medium and high pressure

Question 27

Pack vents are installed on system supplied by_________To vent excess gas to the exterior if the service regulator fails. They may have a white color?

Answer 27

Medium or high pressure; Red Cap. There should normally be no odor of natural gas and a Peck fan. If an odor is detected, you must investigate to determine the source

Question 28

Gas meters can’t supply individual occupancy’s or entire buildings. The quarter turn meter valve that controls the supply of natural gas to the meter is before or after the meter?

Answer 28

Before the meter there should be a quarter turn meter valve that controls the supply of natural gas to the meter

Question 29

Some multi occupancy buildings have only a single master meter. Shutting it down will shut gas to the entire building. Sometimes utility company will have two master meters adjacent to one another so a master meter can be serviced or replaced without interrupting service to the building. To shut supply to the building which meter or meters have to be shut?

Answer 29

The valves to both meters would need to be closed the shut supply to the building

Question 30

Some older apartment buildings may have individual gas meters located inside of each apartment served, and in some buildings, meters may be found in the public hallway. The presence of gas piping or meters in a public hallway requires what?

Answer 30

Appropriate enforcement action refer to the BISP manual

Question 31

Often there are interior gas riser valves coming off the master meter, where are they typically found?

Answer 31

Near the ceiling of the cellar. These can be used to isolate a section of the building instead of sharing service to the entire building.

Question 32

All natural gas appliances should have a 1/4 valve between them in the building/tenant natural gas supply pipe. The pipe connecting the appliance to the supply pipe is?

Answer 32

Rigid or flexible.

Question 33

Commonly found natural gas appliances include:

Answer 33

Stove/oven’s, barbecues, refrigeration, dryer’s, hot water heaters, Window/ wall-mounted gas heaters, fireplaces, Outside decorative lighting

Question 34

When it comes to air conditioners, large commercial units are often located where?

Answer 34

Rooftops or setbacks. Some HVAC units are combination units, housing heating units using natural gas and conventional cooling units.

Question 35

True or false. In the past, natural gas was used for illumination inside of certain buildings. These old gas lines were sealed with wax and, overtime, this wax can deteriorate resulting in a gas leak. These types of leaks may be difficult to locate

Answer 35

True

Question 36

Direct vent appliances; direct vent boilers and hot water heaters have become prevalent throughout the city. They may be located where within a structure? and are vented by a short length of pipe through which wall?

Answer 36

Anywhere within a structure; vented by a short length of pipe through an exterior wall. Direct vent window and through the wall heaters may also be used to heat individual occupancy’s

Question 37

On occasion a response can elevate to a major gas emergency, at which point Fdny strategy should focus on what?

Answer 37

Life safety evacuation

Question 38

The following conditions are indicative of a major gas emergency

Answer 38

Serious damage to major components of the gas infrastructure I. E. A master meter servicing many appliances, guest service pipe, main valves, distribution means, etc
•

Question 39

What percent LEL or greater detected outside or inside could be an indicator of of a major gas emergency?

Answer 39

10% LEL or greater

Question 40

Elevated natural gas readings in an unvented, sub surface structure E. I. Manhole, sewer, etc. of what percent LEL isn’t indicative of a major gas emergency?

Answer 40

20% LEL or greater

Question 41

Guess present in how many subsurface structures isn’t indicative of a major gas emergency?

Answer 41

Two or more

Question 42

Indications of gas migrating into a building from an outside source is what?

Answer 42

And indicative of a major gas emergency

Question 43

True or false gas leaking inside of a structure in the controlling valve cannot be located or is in operable isn’t indicative of a major gas emergency

Answer 43

True

Question 44

Gas leaking or present inside of a wall or avoid any structure isn’t indicative of a major gas emergency?

Answer 44

True

Question 45

When reporting results, members must also report what?

Answer 45

The exact location and should State if they are in proximity to any natural gas appliance. For example: “ladder 38 to Command, we have a reading of 7% LEL in the lobby. “”Ladder for to Command, I am in the cellar by the crack in the foundation and have 15% LEL”

Question 46

If a strong odor is present on approach, stop and meter of the area if the meter displays___Lel , This may be indicative a potentially serious leak and they require treating the incident as a major gas

Answer 46

10%

Question 47

Vent holes, otherwise known as prospecting_____, Or a series of roughly____Holes in the pavement and indicate recent gas utility company work

Answer 47

Bar holes; 1 inch holes

Question 48

The natural gas meter is used to determine the amount of gas present in an area. Tactically, this device should not be used at an appliance, pipe or crack as high levels of gas are expected at these locations. The best practice is to measure readings where?

Answer 48

At a location high and in the middle of the room of the suspected leak; this is the percent LEL to report to the IC

Question 49

The first priority at natural gas emergencies is to ensure what?

Answer 49

There is not a major gas emergency. This is followed by locating and mitigating minor leaks.

Question 50

What is the priority order of valve closure?

Answer 50

1. Appliance valve
2. . Interior gas riser valve
3. Individual meter valve
4. Master meter valve
5. Head of service valve
6. Curb valve/service valve

Question 51

What is the appliance valve usually connected to the gas pipe with?

Answer 51

Hard piping or flexible metal piping. Be careful not to damage plumbing on appliances connected with the rigid pipe. Most natural gas shut off’s or are 1/4 turn variety and can easily be shut off using the fork end of the Halligan, vice grips or pliers to turn the wing cock valve 1/4 turn counterclockwise

Question 52

Interior gas riser valves are found where?

Answer 52

In the basement/cellar near the ceiling.

Question 53

Individual meet her valves are quarter turn valves that shut gas to what

Answer 53

Affected occupancy.

Question 54

When possible avoid shutting the master meter valve if it supplies many occupancy’s/appliances. When possible, prior to shutting a master meter valve do what?

Answer 54

Notify the utility company and inquire as to possible or alternatives. This does not preclude the unit from shutting a master meter valve if natural gas levels are still rising despite other methods and the master meter valve is the closest valve control and gas supply to the leak.

Question 55

A master meter may have a 2nd Master meter adjacent to it. The 2nd m is used in the event of a malfunction in the primary master meter. The utility company can switch service over to the 2nd m without disrupting service to the building. How many of these meters do we have to shut off if we’re shutting the master meter?

Answer 55

Shut both master meters

Question 56

Head of service valve has two names. Building service valve, or Exterior gas riser valve. The building service valve is found where in the building? When the meter or meters are located outside, the valve will be_____ The meters

Answer 56

The building service valve is found just inside of the building. When the meter or meters are located outside, the valve will be before the meters

Question 57

The X tear your gas riser valves are quarter turn valves located on the natural gas riser outside of the building,___ any exterior meters. All exterior meter installations will have a riser valve installed_____To the meter. Each meter has its own shut off valve

Answer 57

Before

Prior

Question 58

Which shut off valve is a last resort for Fdny?

Who should you contact to control a leak using the curb valve/service valve?

Answer 58

Curb valve/service valve is the last resort and must be done and consultation with utility company.
Contact the appropriate utility company control center when necessary to control a leak using the curve valve/service valve.

Question 59

The curve valve/service valve is usually found on the_____Of the curb and shuts the natural gas supply to the entire building. It is generally recessed in from the curb, but maybe in the street. It is usually covered with a______Square or round, brittle concrete or still cover which may be sitting on top of a plastic or wooden plate. To shut the valve, remove or break the cover and plate

Answer 59

Sidewalk side; 4“ x 4“ square or round

Question 60

The gas shut off key consist of a long shift with the uniquely shaped wrench socket on how many ends?

Answer 60

Both ends. Before turning the key, please Choco some other mark near the valve to indicate the start point. This will assist in noting when a quarter turn is complete.

Question 61

What color valve is plastic and easily broken by excess force? Which utility company supplies a white plastic insert for shutting down plastic valves?

Answer 61

White valve. National grid supplies a white plastic insert for shutting down plastic valves. For con Edison plastic curb valve/service valves, use the gas key as is

Question 62

It may be difficult to discern between curb valve/service valves and a main valve. Fdny is not permitted to shut down which?

Answer 62

Not permitted to shut a main valve.

Question 63

Con Edison main valves should have a tag_____ Of the valve housing with an ID number, indicating these are not curb valve/service valves.

Answer 63

Tag inside of the valve housing

Question 64

National grid main valves can be identified by an ID number stamped on_______ Side of the collar______The cover, indicating these are not curve valve/service valves

Answer 64

North side of the cover. Underneath the cover

Question 65

If they leak is serious enough to consider shutting down a master meter valve, head of service valve or curb valve/service valves, consider what?

Answer 65

Consider treating the incident as a major gas emergency.

Question 66

Main valves are usually located where?

Answer 66

On the street side of the curb. They can look like curb valve/service valves. Fdny is not permitted to shut the main valve

Question 67

The main valve cover may be round or square and come in a variety of sizes. Typically what size?

Answer 67

Typically 9 inch or larger

Question 68

Main valves are usually not present on____Pressure gas systems. Stopping the flow of gas will require the street man’s to be excavated and stoppers installed, which may take several hours

Answer 68

Low pressure

Question 69

Remain on scene until meter readings or what?

Answer 69

Until no natural gas remains, zero readings on the meter, no activity on the detector, guess order dissipated, etc.

Question 70

Which code should be transmitted to the dispatcher when an incident is determined to be a major gas emergency?

Answer 70

A 10–75 and 10-80 code 1 Specifying a major gas emergency
The I C may modify the assignment to meet incident needs after careful consideration and consultation with the Haz Mat Batallian via cell phone or 800 MHZ radio(preferred)
The I C should also transmit the location of the designated Command Post and staging area. The officer not put to work by the icy should be the staging area manager until relieved by the sign battalion chief designated the staging area manager

Question 71

For a major gas emergency outside leak set up precautionary hold lines to control possible extension in case the natural gas ignites. Large caliber stream should be considered. If the natural gas ignites what should we do? Should we Operate into the excavation?

Answer 71

Do not extinguish the fire. Avoid operating into the excavation, as water accumulation here Kennett impede isolation and repair. Cool adjacent structures as necessary to prevent extension from radiant heat.

Question 72

Mark the potential blast zone with white?

Answer 72

Red danger do not enter tape and announce the potential blessed some boundaries over the handy talkie and department radio

Question 73

For an inside leak if the natural gas meter displays any readings at the building entrance/1st floor, the ladder company inside team should do what?

Answer 73

Go directly to the basement/seller to investigate.

Question 74

If the leak is found and can be controlled by a valve or, on low pressure service(or medium/high pressure services AFTER The service regulator) By what?

Answer 74

By tapping/plugging, then Do so

Question 75

If levels can be kept at less than___LEL, Remove ignition sources (shut breakers, pull fuses, shut off gas appliances, etc.) Only if this can be done from an area not within the explosive range

Answer 75

Less than 80% LEL (79)

Question 76

If at any time gas levels reach _____of the LEL or higher, treat the affected area as a potential blessed zone

Answer 76

80%

Question 77

If It is expected that natural gas has been leaking for a considerable amount of time and is likely trapped in a void space do what?

Answer 77

Treat the affected area as a potential blast zone

Question 78

Treat the effective area as a potential Blessin if levels cannot be limited to less than ____LEL by venting and

Answer 78

Less than 10% LEL by venting and the leak cannot be found. And there are indications the leak is coming from an outside, subsurface source

Question 79

Apparatus should not be located within a potential blessed song; however if we pulled in by accident what should we do?

Answer 79

Do not enter a potential blast zone to move apparatus.

Question 80

Other agencies should be prevented from entering the potential blast zone and less they are involved in what?

Answer 80

Life-saving procedures; this includes utility company personnel

Question 81

Tactics inside the potential blast zone should be limited to what?
True or false removing ignition sources and venting are good tactics within the potential blast zone

Answer 81

Rapid evacuation;

Removing ignition sources and venting are not options within the potential blast zone

Question 82

The only Fdny issued power equipment that is intrinsically safe is what?

Answer 82

H.M.F.D.
Handy talkies
Natural gas meters
Flashlights issued by the Fdny
Natural gas detectors
These devices should be powered on and a clear environment and remain on until return to a clear environment

Question 83

Rapid evacuation should be evacuation be available stairway, elevator should not be used. The intent is to alert occupants to self evacuate. If no one answers the door move on to the next door. Forcible Entry should only be accomplished for a normal WiFi heard and should not be attempted to access areas that show no signs of being occupied. Conventional Forcible Entry involving the use of an ax to strike the house again

Answer 83

Is not permitted. Entry should be conducted with the use of the ads and of the Halligan the gap and force the door and or with the use of the Hydram hydraulic Forcible Entry tool

Question 84

True or false, and structures with elevators, occupants should be instructed to use the stairs and not the elevators unless the situation makes it in practical example gas leak on an upper floor of a high-rise residential building where Fdny members utilize elevators to evacuate civilians. Elevators and the potential blast zone are not to be used by civilian or Fdny personnel. Elevators create electric arc’s whenever they are activated by the call button or signaled to move.

Answer 84

True

Question 85

True or false. Fog streams should be used to dissipate natural gas pending outside of a structure.

Answer 85

False. Let the gas vent naturally

Question 86

True or false. Do utility company may need to plug or squeeze a pipe with natural gas under pressure to stop a leak. When required and consistent with safety, a charged fog hose line maybe used to protect workers placing a plug or operating the clamp

Answer 86

True. In all cases, the I C has the responsibility and authority to disapprove this tactic if it places utility company personnel or Fdny members at risk.

Question 87

If Fdny members can remove power from the area of the week before natural gas readings reach ___LEL, it should be done.

Answer 87

80% LEL. In order to determine this, explosive readings must be taken or ever the highest concentration of natural gas has accumulated in the building. This is usually, but not always, near the source of the leak. If any readings display levels of 80% LEL or greater, the opportunity to cut power has expired

Question 88

When unable to locate the source of the leak, can we shut power?

Answer 88

No

Question 89

After evacuation, and upon consultation with the appropriate utility companies, the IC may consider allowing utility company to cut power remotely from a utility pole or manhole, even if the natural gas levels are in explosive range, what conditions must be met?

Answer 89

All personnel’s including Fdny and utility company personnel remain withdrawn from the potential blast zone. It is important to remain aware that even a remote power removal may trigger an explosion. Also the location from which the utility company is cutting power must not be located within the potential blast zone

Question 90

If previous ventilation efforts have failed to prevent the area from becoming a potential blast zone (based on what numbers? )Then the emphasis should be rapid evacuation not ventilation

Answer 90

80% or more LEL gas leak location known or 10% or more LEL gas leak location unknown. No area can be considered too rich to burn as these areas, add some portion of the affected space, or in the explosive range and will explode and involve the entire area if an ignition source is reached

Question 91

True or false. Venting windows and doors as they are past is permissible if doing so well not the late evacuation. Do not remain in the potential blast zone simply to ventilate.

Answer 91

True

Question 92

When HVAC intakes of a building are exposed to an outdoor natural gas leak, fresh air supply fans should be____

Answer 92

Shut down to prevent drawing gas in. Similarly, HVAC systems should be shut down when the equipment or area is involved in the gas leak. Consult with building engineers or company in-house personnel.

Question 93

True or false. Round electric manhole covers can be removed by Fdny personnel.

Answer 93

True the following conditions must be met: requested by an on scene utility company worker. Approved by an on scene Chief officer. The cover has been determined to be free of stray voltage by an unseen utility company.

Question 94

Sewer manhole covers may be removed by the following?

Answer 94

Approval of an on scene chief officer. The chief officer should ensure that the area is cordon off to identify the hazard of the

Question 95

Round manhole covers shall be removed by how many firefighters? Utilizing manhole hooks found where?

Answer 95

Two firefighters; Batallian rig Carries two manhole hooks

Question 96

True or false. Rectangular or square electric manhole covers shall not be pulled by the Fdny

Answer 96

True

Question 97

There are times when we cannot pull any electric manhole cover or any cover if there is doubt as to which type. When are these times?

Answer 97

There is a manhole fire in the area: or smoking or arcing is observed in the electric manhole or transformer vault

Question 98

If there are indications that natural gas is migrating through the sewer system who can provide information as to the run of the sewers in the area?

Answer 98

DEP and NYCEM

Question 99

It is expected that units not used for rapid evacuation shall do what?

Answer 99

Member should access exposures to define the extent of the gas migration. Can be used to perform additional evacuation as well as reconnaissance and metering of an affected structures point of entry and sewer traps

Question 100

It is important to specify the need for what type of crew if the operation may require work below ground. If a car valve/service valve fails on a low pressure system. What type of crew will be required?

Answer 100

Construction crew; construction crew

Question 101

Any unit observing the arrival of the first I’m seeing utility company crew or supervisor should report the arrival to who? And inform the utility company member to report where?

Answer 101

IC; report to the Fdny IC

Question 102

Can NYPD assist and evacuation?

Answer 102

NYPD can assist in evacuation. And my PD can manage the scene by controlling vehicle and pedestrian traffic. In addition, the NYPD can request a toe or search the registration and records of parked vehicles to expedite the removal

Question 103

Con Ed will notify the dispatcher when repair work is to be performed. Upon this notification, the borrowed dispatcher will assign the nearest available Batallian and engine or ladder company for an administrative assignment. Unit she’ll respond and how?

Answer 103

Non-emergency mode