Em Procedure Nat Gas Flashcards
(103 cards)
1
Q
What is natural gas comprised of?
A
Mainly of methane but also contains propane, ethane and nitrogen
2
Q
What classification Haz Mat is natural gas?
A
Class too, division one substance. Extremely flammable
3
Q
Depending on the mixture, the explosive range is
A
5 to 15%
4
Q
Colorless and odorless; however to aid in detection ______ is added to natural gas as an odorant giving it a____ smell.
A
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
5
Q
Is natural gas lighter than air?
A
Significantly lighter than air
6
Q
Is natural gas toxic?
A
Non-toxic, but insufficient quantity natural gas can displace oxygen in and close space and cause asphyxiation
7
Q
2 ft.³ of natural gas has the approximate energy potential of____ of tnt
A
1 pound
8
Q
When unconfined outdoors, can natural gas explode?
A
It will burn rapidly without triggering explosive pressure
9
Q
Where are con Edison gas distributes?
A
Manhattan, the Bronx, and in Queens, generally north of the Grand Central Parkway
10
Q
National grid distribute gas to?
A
Brooklyn, Staten Island and in Queens, generally south of the Grand Central Parkway
11
Q
Gate stations are facilities that have remote monitoring by the utility company gas control center. Do they have on-site personnel?
A
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
12
Q
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?
A
Steel, and I generally installed below major roads
13
Q
Medium and low pressure distribution means are made of?
A
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
14
Q
________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
A
Hi and medium
15
Q
Which companies gas Main valves have ID numbers on tags inside the valve cover?
A
Conedison
16
Q
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
A
National grid
17
Q
Which distribution means generally do not have valves and isolating sections?
A
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
18
Q
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?
A
Sidewalk side.
4” x 4” square or round, brittle concrete or steel cover which may be sitting on top of plastic or wooden plate
19
Q
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?
A
National grid; identified by an arrow cast into the cover pointing to the building and supplies.
20
Q
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?
A
NC
21
Q
What is stamped on a tag near the service meter indicating an excess flow valve exists in line on the service pipe.
A
EFV. The EFV should limit or stop excess flow down pressure from it
22
Q
What is another name for a curb valve?
A
Service valve
23
Q
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?
A
Outside of the building. If an Exterior gas service valve is present, no curb valve/service valve is required
24
Q
Head of service valves control the supply of gas to meters where?
A
Inside of buildings
25
typical house appliance pressure is how much? A few commercial customers receive gas at what psi?
1/4 psi; 1 to 3 psi
| There are a small number of large facilities that utilize full line pressure, especially for power generation
26
Service regulators are usually located _______ The gas meter on_________ Systems to reduce gas flow to low pressure (1/4 psi)
Before; medium and high pressure
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?
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
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?
Before the meter there should be a quarter turn meter valve that controls the supply of natural gas to the meter
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?
The valves to both meters would need to be closed the shut supply to the building
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?
Appropriate enforcement action refer to the BISP manual
31
Often there are interior gas riser valves coming off the master meter, where are they typically found?
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.
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?
Rigid or flexible.
33
Commonly found natural gas appliances include:
Stove/oven’s, barbecues, refrigeration, dryer’s, hot water heaters, Window/ wall-mounted gas heaters, fireplaces, Outside decorative lighting
34
When it comes to air conditioners, large commercial units are often located where?
Rooftops or setbacks. Some HVAC units are combination units, housing heating units using natural gas and conventional cooling units.
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
True
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?
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
37
On occasion a response can elevate to a major gas emergency, at which point Fdny strategy should focus on what?
Life safety evacuation
38
The following conditions are indicative of a major gas emergency
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
•
39
What percent LEL or greater detected outside or inside could be an indicator of of a major gas emergency?
10% LEL or greater
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?
20% LEL or greater
41
Guess present in how many subsurface structures isn’t indicative of a major gas emergency?
Two or more
42
Indications of gas migrating into a building from an outside source is what?
And indicative of a major gas emergency
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
True
44
Gas leaking or present inside of a wall or avoid any structure isn’t indicative of a major gas emergency?
True
45
When reporting results, members must also report what?
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”
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
10%
47
Vent holes, otherwise known as prospecting_____, Or a series of roughly____Holes in the pavement and indicate recent gas utility company work
Bar holes; 1 inch holes
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?
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
49
The first priority at natural gas emergencies is to ensure what?
There is not a major gas emergency. This is followed by locating and mitigating minor leaks.
50
What is the priority order of valve closure?
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
51
What is the appliance valve usually connected to the gas pipe with?
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
52
Interior gas riser valves are found where?
In the basement/cellar near the ceiling.
53
Individual meet her valves are quarter turn valves that shut gas to what
Affected occupancy.
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?
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.
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?
Shut both master meters
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
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
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
Before
| Prior
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?
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.
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
Sidewalk side; 4“ x 4“ square or round
60
The gas shut off key consist of a long shift with the uniquely shaped wrench socket on how many ends?
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.
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?
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
62
It may be difficult to discern between curb valve/service valves and a main valve. Fdny is not permitted to shut down which?
Not permitted to shut a main valve.
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.
Tag inside of the valve housing
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
North side of the cover. Underneath the cover
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?
Consider treating the incident as a major gas emergency.
66
Main valves are usually located where?
On the street side of the curb. They can look like curb valve/service valves. Fdny is not permitted to shut the main valve
67
The main valve cover may be round or square and come in a variety of sizes. Typically what size?
Typically 9 inch or larger
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
Low pressure
69
Remain on scene until meter readings or what?
Until no natural gas remains, zero readings on the meter, no activity on the detector, guess order dissipated, etc.
70
Which code should be transmitted to the dispatcher when an incident is determined to be a major gas emergency?
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
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?
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.
72
Mark the potential blast zone with white?
Red danger do not enter tape and announce the potential blessed some boundaries over the handy talkie and department radio
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?
Go directly to the basement/seller to investigate.
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?
By tapping/plugging, then Do so
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
Less than 80% LEL (79)
76
If at any time gas levels reach _____of the LEL or higher, treat the affected area as a potential blessed zone
80%
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?
Treat the affected area as a potential blast zone
78
Treat the effective area as a potential Blessin if levels cannot be limited to less than ____LEL by venting and
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
79
Apparatus should not be located within a potential blessed song; however if we pulled in by accident what should we do?
Do not enter a potential blast zone to move apparatus.
80
Other agencies should be prevented from entering the potential blast zone and less they are involved in what?
Life-saving procedures; this includes utility company personnel
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
Rapid evacuation;
| Removing ignition sources and venting are not options within the potential blast zone
82
The only Fdny issued power equipment that is intrinsically safe is what?
```
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
```
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
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
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.
True
85
True or false. Fog streams should be used to dissipate natural gas pending outside of a structure.
False. Let the gas vent naturally
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
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.
87
If Fdny members can remove power from the area of the week before natural gas readings reach ___LEL, it should be done.
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
88
When unable to locate the source of the leak, can we shut power?
No
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?
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
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
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
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.
True
92
When HVAC intakes of a building are exposed to an outdoor natural gas leak, fresh air supply fans should be____
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.
93
True or false. Round electric manhole covers can be removed by Fdny personnel.
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.
94
Sewer manhole covers may be removed by the following?
Approval of an on scene chief officer. The chief officer should ensure that the area is cordon off to identify the hazard of the
95
Round manhole covers shall be removed by how many firefighters? Utilizing manhole hooks found where?
Two firefighters; Batallian rig Carries two manhole hooks
96
True or false. Rectangular or square electric manhole covers shall not be pulled by the Fdny
True
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?
There is a manhole fire in the area: or smoking or arcing is observed in the electric manhole or transformer vault
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?
DEP and NYCEM
99
It is expected that units not used for rapid evacuation shall do what?
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
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?
Construction crew; construction crew
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?
IC; report to the Fdny IC
102
Can NYPD assist and evacuation?
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
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?
Non-emergency mode
