Propan Çəninin Sızması, Zirzəmidə Qazın Birləşdirilməsi və Silindrlərin Aşırı İstiləşməsi¶
Təcili yardım nömrələri ölkəyə görə fərqlənir. Bu səhifə ABŞ və Kanada üçün 911 rəqəmindən istifadə edir. Bir çox başqa ölkələr 112, 999 və ya başqa bir rəqəmdən istifadə edirlər. Ölkəniz üçün nömrəni tapın.
Millions of rural homes, farms, cabins, outdoor kitchens, and recreational vehicles rely on Liquefied Petroleum Gas (LPG / propane) stored inside outdoor bulk stationary tanks (ranging from 450 to 4,000 liters / 120 to 1,000 US gallons) or portable 9-kilogram (20-pound) steel cylinders. While propane and natural gas are both odorized with foul-smelling ethyl mercaptan (which smells like rotten eggs, skunk spray, or decaying cabbage), propane behaves in a fundamentally different and far more treacherous physical manner when it leaks inside a building. Natural gas (methane) is lighter than air (specific gravity 0.60), so it rises toward the ceiling and vents out upper windows. Propane gas is 1.52 times heavier than air. When propane leaks from a basement furnace valve, a water heater line, or a corroded copper pigtail pipe, the invisible gas sinks straight to the floor like invisible water, flowing silently down basement stairs, pooling knee-deep inside cellars, crawlspaces, and sump pits, and waiting for a water heater pilot light, sump pump float switch, or refrigerator compressor relay to ignite a devastating foundation-level explosion.
Two additional propane-specific emergencies catch homeowners off guard every year: odorant fade, where leaking underground propane gas filters through soil or rust inside a new steel tank, stripping out the rotten-egg smell so a basement fills with 100 percent odorless explosive gas; and Boiling Liquid Expanding Vapor Explosions (BLEVE), when a brush fire, garage fire, or barbecue grease fire heats the upper steel shell of a pressurized propane tank until the metal softens and ruptures into a massive rocket-propelled fireball. Knowing how to evacuate a basement without touching a single light switch or cell phone, how to shut the handwheel valve under the outdoor tank dome, and when to evacuate 800 meters (½ mile) away from a roaring tank pressure relief valve saves your family's lives.
Bunu indi edin¶
If you smell rotten eggs or skunk odor in your home or yard, hear a loud hissing sound from a propane tank or appliance, or see fire impinging on a propane cylinder, execute these six actions immediately:
- Evacuate everyone from the house immediately, ESPECIALLY from basements and ground floors: Because propane is 1.5 times heavier than air, a leaking basement can be above the Lower Explosive Limit at ankle and waist level before anyone upstairs smells a faint whiff. Order everyone upstairs and out the front door on foot immediately; never go down into a basement to check a furnace or sniff near the floor.
- Do NOT flip any light switches, unplug appliances, use a landline or cell phone indoors, or press an electric garage door opener: When a room contains a propane-air mixture between 2.1 percent and 9.5 percent, the microscopic electrical arc inside a wall toggle switch, a thermostat relay, a keyless entry fob, or a garage door opener motor will detonate the entire house. Leave the lights exactly as they are and walk out through an unlocked manual door.
- Never start or move a car, lawnmower, or golf cart parked in the garage or driveway near the leak: Internal combustion starters and hot catalytic converters ignite ground-hugging propane vapor plumes instantly. Leave all vehicles parked where they are and walk at least 100 meters (330 feet) upwind and uphill from the house.
- If the leak is unignited and you can safely reach your outdoor bulk propane tank upwind, close the main supply valve clockwise: Lift the hinged metal protective dome on top of your outdoor residential propane tank, locate the round brass or metal Service Shutoff Handwheel Valve, and turn it clockwise (to the right, "righty-tighty") until firmly closed. Never attempt to close a valve if the tank is hissing liquid frost onto your hands, if the tank is inside a low pit, or if fire is anywhere near the cylinder.
- NEVER extinguish a flaming jet of propane shooting out of a tank valve unless you can immediately turn off the fuel flow: If a leaking propane cylinder catches fire at the valve or pressure relief port, the flame is safely burning off the escaping gas outside. If you extinguish the flame with a dry chemical extinguisher while propane continues pouring out, the unburned heavier-than-air gas will pool across the ground and explode violently the instant it finds a new spark.
- If fire is heating a propane tank or the safety relief valve begins roaring like a jet engine, evacuate 300 to 800 meters (1,000 feet to ½ mile) away behind solid cover: A propane tank exposed to fire is at imminent risk of a BLEVE (Boiling Liquid Expanding Vapor Explosion). Call your local təcili nömrələr (911 in the United States and Canada, 112 across the European Union, 999 in the United Kingdom) and your propane gas supplier from a safe distance uphill.
Why 'Odorant Fade' makes underground and basement propane leaks completely odorless
Never assume that because you cannot smell rotten eggs, there is no propane in your basement. According to the United States Chemical Safety and Hazard Investigation Board (CSB) and the National Fire Protection Association (NFPA), the chemical odorant added to propane (ethyl mercaptan) is susceptible to odorant fade: 1. Soil Adsorption: If an buried copper or steel propane line develops a leak underground, the damp clay or sandy soil acts like a giant chemical filter, stripping 90 percent of the ethyl mercaptan out of the gas as the odorless propane migrates along the outside of the pipe straight through your basement foundation wall. 2. Internal Tank Rust Oxidation: Inside new or slightly damp steel tanks, iron oxide (rust) chemically reacts with ethyl mercaptan and converts it into odorless disulfide compounds. 3. Olfactory Fatigue: Breathing ethyl mercaptan for 10 minutes deadens your nasal receptors so you stop smelling it. Every home with propane appliances MUST have an UL 1484-listed explosive gas (LPG/propane) alarm plugged in near the floor (within 15 to 30 centimeters / 6 to 12 inches of the baseboard) in the basement and utility room.
Tactical decision tree for propane leaks and overheating cylinders¶
Use this operational decision tree to distinguish between an indoor/basement vapor leak, an outdoor liquid line rupture, and a high-risk cylinder fire / BLEVE scenario.
flowchart TD
Start["Propane Emergency: Rotten Egg Odor, Hissing Pipe, Gas Alarm, or Fire Near Tank"] --> Scenario{"1. Where is the hazard located?"}
Scenario -->|"A. Indoors / Basement Odor or LPG Alarm"| NoSparks["1. DO NOT touch light switches, phones, thermostats, or garage door openers<br/>2. Never walk down into the basement"]
NoSparks --> EvacUp["Evacuate everyone outdoors immediately; walk UPHILL and UPWIND at least 100m (330 ft)"]
EvacUp --> ShutValve{"Can you safely reach the outdoor tank upwind without walking through gas?"}
ShutValve -->|"Yes: Outdoor Tank Clear"| TurnClockwise["Lift tank dome and turn main brass handwheel CLOCKWISE (to the right) until shut"]
ShutValve -->|"No: Hissing Loudly or Frosty"| Call911["Stay back 100m+; call 911 / 112 / 999 and Propane Utility"]
TurnClockwise --> Call911
Scenario -->|"B. Fire Impinging on Grill Cylinder or Bulk Tank"| BleveCheck{"Is the tank Pressure Relief Valve roaring/venting torches of fire, or is fire heating the bare upper metal?"}
BleveCheck -->|"Yes: Roaring Jet or Direct Flame on Tank"| BleveEvac["IMMINENT BLEVE RISK: Abandon suppression immediately; sprint 300m to 800m (1,000 ft to 1/2 mile) uphill behind solid building cover; warn arriving firefighters"]
BleveCheck -->|"No: Small flame at regulator hose only, tank cool"| HoseShut["Only if reachable from upwind with zero flame on tank body: Close cylinder handwheel clockwise with leather glove to starve flame; otherwise evacuate"]
Comparison matrix: propane (LPG) vs. natural gas (methane) in home emergencies¶
Homeowners who move from a city house served by municipal natural gas to a suburban or rural property served by propane often apply natural-gas instincts that are fatal during a propane leak. Compare their physical and explosive behaviors:
| Physical & Safety Property | Propane (Liquefied Petroleum Gas / \(C_3H_8\)) | Natural Gas (Pipeline Methane / \(CH_4\)) |
|---|---|---|
| Vapor Density vs. Air (Air = 1.00) | 1.52 to 2.00 (Heavier than air): Sinks straight to the floor, flows downhill like water, and pools indefinitely inside basements, crawlspaces, floor drains, trenches, and valleys | 0.55 to 0.65 (Lighter than air): Rises rapidly toward the ceiling, attic, and upper floors, and dissipates quickly into the upper atmosphere outdoors |
| Where to Mount Explosive Gas Detectors | LOW on the wall: 15 to 30 cm (6 to 12 inches) above the floor in basements, utility rooms, and kitchens (a ceiling-mounted detector will NOT detect a floor pool of propane until the room is already explosive) | HIGH on the wall: 15 to 30 cm (6 to 12 inches) below the ceiling so rising methane plumes hit the sensor first |
| Storage State & Expansion Ratio | Stored on your property as a pressurized liquid at 700 to 1,400 kPa (100 to 200 psi); 1 liter of liquid propane expands into 270 liters of flammable gas when released | Delivered as a low-pressure gas through municipal street mains at 1.7 to 14 kPa (0.25 to 2 psi); no liquid tank stored on residential property |
| Boiling Point & Frostbite Risk | Minus 42°C (Minus 44°F): Escaping liquid propane flash-boils and freezes moisture in the air into a dense white fog cloud; touching a liquid leak causes instant deep-tissue cryogenic frostbite | Minus 162°C (Minus 260°F) only at utility LNG plants; residential pipe leaks are room-temperature gas with no cryogenic frostbite hazard |
| Flammability Range in Air (LEL to UEL) | 2.1% to 9.5% gas-to-air concentration: Only a tiny 2.1% concentration of propane in basement air is needed to trigger a violent explosion | 5.0% to 15.0% gas-to-air concentration: Requires more than double the concentration of propane before reaching the Lower Explosive Limit |
| Energy Content per Cubic Meter (Cubic Foot) | 93 Megajoules/\(m^3\) (2,500 BTU/\(ft^3\)): Contains 2.5 times more explosive heat energy per unit volume of gas than natural gas | 37 Megajoules/\(m^3\) (1,000 BTU/\(ft^3\)) |
Deep dive 1: How heavier-than-air propane pools in basements and how to evacuate safely¶
Because propane vapor weighs one and a half times as much as air, a slow leak in a basement water heater, furnace gas valve, clothes dryer, or flare fitting behaves exactly like an invisible flood filling a swimming pool from the bottom up.
[BASEMENT PROPANE POOLING ANATOMY]
First Floor: [Occupants barely smell faint odor at nose height]
======================================================== (Floor Joists)
Basement Ceiling: [0.2% Propane - Clean Air]
|
Mid-Wall (1.5m): [1.0% Propane - Below LEL]
|
Knee/Waist Level: [2.1% to 9.5% PROPANE - EXPLOSIVE ZONE]
| <-- Standing pilot light, sump pump switch,
| or furnace igniter sits right here
Basement Floor: [12%+ Dense Propane Pool & Sump Pit Trap]
========================================================
The 4 hidden ignition triggers that detonate pooled basement propane¶
In dozens of fatal residential propane explosions investigated by the NFPA and state fire marshals, a homeowner smelled a faint trace of gas (or heard their pilot light go out) and walked down the basement stairs to investigate. Walking down into a propane-flooded basement triggers an explosion through four mechanisms:
- Flipping the wall switch at the top or bottom of the basement stairs: When you flip a standard 120-volt or 230-volt wall light switch ON or OFF, the brass contacts inside the switch box draw a tiny blue electrical arc. If the propane layer has risen to switch height (or if turning off an upstairs switch drops a relay in the basement), that spark ignites the entire vapor cloud.
- Automatic basement appliances cycling on by themselves: Even if you never touch a light switch, your basement contains at least three appliances with unsealed electrical contacts mounted within 30 centimeters (12 inches) of the floor:
- The sump pump float switch sitting in the lowest pit of the basement floor.
- The water heater standing pilot light or piezo spark igniter mounted 10 centimeters (4 inches) off the floor slab.
- A basement chest freezer, beer fridge, or dehumidifier compressor relay.
- Static electricity from synthetic clothing or pets: Walking down dry carpeted stairs in wool socks or pulling off a fleece sweater in winter generates a 5,000-volt static spark containing more than enough millijoules of energy to ignite a stoichiometric propane-air mixture.
- Attempting to relight a "blown-out" water heater pilot light yourself: One of the most common fatal scenarios occurs when a homeowner notices they have no hot water, goes down to the basement, sees the water heater pilot light is out, and clicks the red piezo spark button, not realizing that a defective thermocouple or gas valve has been dumping unburned heavier-than-air propane onto the floor around their feet for hours.
Step-by-step survival protocol if you suspect an indoor propane leak¶
- Stay out of the basement and crawlspace completely: Never walk down basement steps to shut off a furnace valve, unplug a dehumidifier, or rescue belongings.
- Do NOT open basement windows from the inside: While opening windows is sometimes mentioned for minor kitchen burner puffs, spending 60 seconds inside a gas-filled room struggling with stuck metal basement window latches exposes you to an imminent appliance-relay explosion and asphyxiation. Get every human and pet out the front door immediately.
- Walk uphill and upwind: Outside in calm evening air (temperature inversions), a large outdoor propane leak from a buried line or tank regulator flows downhill along ditches, driveways, and retaining walls like a river of invisible fog. Walk uphill and upwind at least 100 meters (330 feet) away from the structure and low-lying gullies.
Deep dive 2: How to shut off a residential bulk propane tank or 20-pound grill cylinder¶
Every homeowner who uses propane should walk out to their tank in daylight today and locate the main shutoff valve so they can close it in ten seconds during an emergency, winter storm, or earthquake.
1. Shutting off a large stationary residential bulk tank (120 to 1,000 gallons)¶
[UNDER THE BULK PROPANE TANK DOME]
+-----------------------+
/ Hinged Metal Dome \
+---------------------------+
| [Pressure Gauge] |
| |
| ( === ) <-- MAIN SERVICE SHUTOFF HANDWHEEL
| | | Turn CLOCKWISE (Right) to Close
| [brass valve] ----> [Copper Pigtail to Regulator]
--+-----------------------+--
/ Steel Tank Body \
- Approach only from upwind: Before walking up to your outdoor propane tank, pause 15 meters (50 feet) away. Look for a dense white cloud of condensing vapor hovering around the tank or ground, and listen for a loud roaring or hissing sound. If liquid propane is spraying out of a ruptured valve or if fire is anywhere near the tank, DO NOT APPROACH; retreat 300+ meters (1,000+ feet) and call 911 / 112 / 999.
- Lift the protective steel or plastic dome lid: On top of the horizontal (or vertical) cylindrical tank is a rounded hinged cover. Pull the latch pin and swing the dome open.
- Locate the Multi-Valve Service Handwheel: You will see several brass fittings protruding from the top of the tank (a large yellow-capped filler valve, a tall spring-loaded pressure relief valve in the center, a circular float gauge showing tank percentage, and a round scalloped brass or aluminum handwheel connected to the thin copper pigtail tube leading to the first-stage regulator).
- Turn the handwheel CLOCKWISE (to the right) until snug: No wrench is required on a propane tank service valve (unlike a natural gas meter). Grip the round handwheel, wearing leather work gloves if the brass is cold, and turn it clockwise ("righty-tighty") several full rotations until it seats firmly and stops. This isolates 100 percent of the liquid and vapor inside the tank from your underground house piping.
2. Managing a leaking or frosting 9-kilogram (20-pound) portable barbecue / RV cylinder¶
Portable cylinders used on gas grills, patio heaters, and RV trailers develop leaks primarily from two sources: a cracked black rubber regulator hose (often chewed by squirrels or mice over winter) or the internal spring-loaded Pressure Relief Valve (PRV) popping open because the cylinder was overfilled above 80 percent capacity and left sitting in hot summer sun.
- If the cylinder is hissing loudly from the rear side of the brass valve (Pressure Relief Valve venting):
- As a propane tank heats up in direct sunlight, the liquid propane inside expands rapidly. If a faulty OPD (Overfill Prevention Device) float allowed the tank to be filled past 80 percent liquid volume, expanding liquid has nowhere to go, causing internal pressure to spike above 2,585 kilopascals (375 psi).
- At 375 psi, the spring-loaded safety relief valve pops open with a loud HISS-POP and jets a plume of propane gas into the air to prevent the steel cylinder from rupturing, then snaps shut once pressure drops, repeating every few minutes.
- What to do: Extinguish all open flames, cigarettes, and grill burners within 30 meters (100 feet). Do not try to plug or hammer the relief valve shut. If the cylinder is not on fire and you can safely spray it from 5 to 10 meters (16 to 33 feet) away with a garden hose, spraying cool water over the outside of the steel tank cools the liquid inside, drops the internal pressure below 375 psi, and allows the relief valve to reseat safely. Once it stops hissing, call your propane supplier or fire department to safely bleed and dispose of the defective tank.
Deep dive 3: Cylinder overheating and BLEVE (Boiling Liquid Expanding Vapor Explosion)¶
The single most violent explosion hazard in residential and rural firefighting is a BLEVE (pronounced "blev-ee"): a Boiling Liquid Expanding Vapor Explosion. Understanding the exact physics of how a propane tank BLEVEs explains why you must never linger to fight a garage, deck, or brush fire once flames reach a propane tank.
The 4-stage anatomy of a propane tank BLEVE¶
[HOW A PROPANE TANK BLEVE DEVELOPS]
1. External Fire Heats Tank ---> Liquid propane boils violently; internal
pressure hits 2,585 kPa (375 psi).
2. Relief Valve Pops Open ---> A 3-to-10-meter (10-to-33-foot) blowtorch of
fire roars out the top relief valve, dropping
the liquid level inside the tank.
3. "Dry Wall" Steel Weakens ---> Below the liquid line, boiling propane keeps
Above the Liquid Line the steel cool. ABOVE the liquid line (the
vapor space), flames heat the dry steel above
600°C (1,100°F) until it loses 70% of its
tensile strength and bulges like a blister.
4. Catastrophic Split & ---> The weakened upper steel rips open; superheated
270:1 Flash-Boil Fireball liquid propane flashes instantly into a 100-meter
(330-foot) fireball and launches steel shrapnel
up to 500 meters (1,600 feet) away.
Unmistakable warning signs of an imminent BLEVE (Get out immediately)¶
If a structure fire, vehicle fire, or wildland grass fire reaches an outdoor propane tank or portable cylinder, watch and listen for these four imminent BLEVE warning signs:
- The Pressure Relief Valve activates with a deafening jet-engine roar: When the tank's safety relief valve opens under fire impingement, it shoots a vertical blowtorch of roaring white-orange flame 5 to 15 meters (16 to 50 feet) into the air. While the relief valve is doing its job, it cannot prevent a BLEVE if flames continue heating the dry upper steel shell of the tank.
- The pitch of the roaring relief valve keeps rising (Rising Whistle): As the liquid boils away and the tank heats higher, the screaming sound of the escaping gas climbs steadily in pitch like a giant tea kettle.
- Blistering, peeling paint, or glowing red/orange metal on the upper half of the tank: This indicates that the dry vapor-space steel above the liquid level is surpassing 550 degrees Celsius (1,020 degrees Fahrenheit) and is seconds away from structural rupture.
- Time from direct flame contact to BLEVE can be as short as 8 to 15 minutes: NFPA and US Department of Transportation (DOT) Emergency Response Guidebook (ERG Guide 115) tests demonstrate that an uncooled propane tank engulfed in direct flame can rupture in under 10 minutes.
Evacuation distances for fire-involved propane tanks (DOT ERG Guide 115)¶
- For a small 9-to-45-kilogram (20-to-100-pound) portable grill or RV cylinder in a fire: Evacuate everyone at least 100 to 300 meters (330 to 1,000 feet) away and move behind the solid masonry wall of another building (never stand in direct line-of-sight watching a burning garage or barbecue grill, as rupturing 20-pound cylinders rocket sideways through fences and car windshields).
- Yanğın zamanı 450 ilə 4000 litrlik (120 ilə 1000 qallon) böyük bir yaşayış tankı üçün: Dərhal bütün istiqamətlərdə 800 metr (½ mil) boşaldın və heç vaxt **oxun üfüqündən kənara doğru olan **iki yuvarlaq ucları (başları) ilə bir sırada dayanmayın, qırılma zamanı.
Dərin dalış 4: Kəskinlikdən sonra və daşqından sonra propan təhlükəsizlik qaydaları¶
Hətta aktiv yanğın olmadıqda belə, iki gündəlik məişət hadisəsi, qışda propanın tükənməsi və açıq çəni qaldıran sel suları, düzgün idarə edilmədikdə, gecikmiş partlayış təhlükəsi yaradır.
1. Niyə siz heç vaxt "tükənmiş" propan çənini peşəkar sızma yoxlanışı olmadan işə salmamalısınız?¶
Əgər toplu propan çəniniz qışın ortasında tamamilə boş işləyirsə (və ya fövqəladə vəziyyət zamanı əsas çən klapanını bağlasanız): - Köhnə su qızdırıcıları, yer qızdırıcıları, kaminlər və silsilələrdəki bütün daimi pilot işıqları sönür və soyuqda aşağı təzyiqli qaz xətləri daralır. - Çatdırılma sürücüsü çəni yenidən doldurarsa və ya ev sahibi əvvəlcə hər bir klapanı yoxlamadan və manometr təzyiqinin düşmə sızması sınağı keçirmədən (NFPA 54 / Milli Yanacaq Qaz Kodu tələb edir) çən klapanı yenidən işə salarsa, yanmamış propan açıq cihazın klapanından və ya pilot portundan zirzəmiyə tökülə bilər. - Təhlükəsizlik Qaydası: Əgər çəninizdə qaz qurtararsa, bütün cihazın klapanlarını bağlayın və sertifikatlı propan texnikindən tam sistem sızma testi keçirməsini və xidməti bərpa etməzdən əvvəl hər bir pilot işığını yenidən yandırmasını tələb edin.
2. Su basmış və ya qarla basdırılmış tənzimləyicilər və çənlər¶
- Tənzimləyicinin ventilyatorlarını qar və buz qabığından təmizləyin: Hər bir açıq hava propan tənzimləyicisində səhv ekranı ilə qorunan kiçik aşağıya baxan nəfəs alma ventilyasiyası var. Güclü yaş qar, dondurucu yağış və ya buzlaq tənzimləyicinin havalandırmasını bağlayan tıxacları bağlayarsa, daxili diafraqma təzyiqi tənzimləmək üçün hərəkət edə bilməz, yüksək təzyiqli maye/buxar propanı birbaşa ev cihazlarınıza atır və pilot alovu söndürür. Yumşaq süpürgə ilə çəninizin günbəzini və tənzimləyicinizi qardan yumşaq bir şəkildə təmizləyin (heç vaxt mis xətləri və ya mis tənzimləyiciləri metal kürəklə döyməyin).
- Sel zamanı üzən çənlər: Yarım dolu propan çəni son dərəcə üzmə qabiliyyətinə malikdir və 60 santimetr (2 fut) daşqın suyunda mantar kimi üzərək onun bərk mis ev xəttini qıracaq. Daşqın Xəbərdarlığı verilərsə, evakuasiya etməzdən əvvəl çən qübbəsinin altındakı əsas əl çarxı klapanını bağlayın ki, çən üzərək borunu qoparsa, çəndən sıfır propan çıxsın.
Ev sahibi propan təhlükəsizliyi yoxlama siyahısı¶
Bu beş bəndlik yoxlama siyahısını doldurmaqla evinizi havadan daha ağır qazın yığılmasından və qoxuların solmasından qoruyun:
- UL 1484 propan qaz detektorlarını MƏTƏBƏ səviyyəsində quraşdırın: Zirzəmidə su qızdırıcısı/sobasının yanında və mətbəxdə propan diapazonunun yaxınlığında yerdən **15-30 santimetr (6-12 düym) hündürlükdə **şəkilli (batareya ehtiyatı ilə) partlayıcı qaz siqnalları quraşdırın. (Unutmayın: standart tüstü və karbonmonoksit siqnalları xüsusi olaraq ikili CO + Partlayıcı Qaz vahidi kimi qiymətləndirilmədiyi halda yanmamış propan sızmalarını YOX aşkar etmir.)
- 9 kiloqramlıq (20 funt) qril silindrlərini heç vaxt qapalı yerlərdə, əlavə qarajda və ya zirzəmidə saxlamayın: NFPA 58 ehtiyat və ya ayrılmış 20 funtluq propan balonlarını hər hansı bir evdə, zirzəmidə, günəş eyvanında və ya əlavə edilmiş qarajda saxlamağı qəti qadağan edir. Daşınan silindrləri həmişə açıq havada, quruducu havalandırma kanallarından və zirzəmi pəncərələrindən uzaq, kölgəli, yaxşı havalandırılan yerdə dik vəziyyətdə saxlayın.
- Hər yaz qril şlanqlarında "Sabunlu Su Bubble Testi"ni həyata keçirin: Hər mövsüm ilk dəfə propan manqal qrilinizi yandırmazdan əvvəl, 50/50 maye qab sabunu və suyu bir sprey şüşəsində qarışdırın, qril brülörləri OFF vəziyyətində silindr klapanını açın və latun tənzimləyici birləşməni və bütün şlanq uzunluğunu püskürtün. Armatur və ya şlanqın hər hansı bir yerində qabarcıqlar böyüyərsə, alovlandırıcıya dəyməzdən əvvəl dərhal çən klapanını bağlayın və tənzimləyici şlanqı dəyişdirin.
- Toplu çənləri yalnız açıq, istilik əks etdirən rənglərə boyayın: Stasionar açıq propan çənləri günəş radiasiyasını əks etdirmək üçün qanunla (NFPA 58) ağ, gümüş və ya açıq pastel boz rəngə boyanır. Həyətinizdə "kamuflyaj" etmək üçün heç vaxt propan çənini tünd yaşıl, qara və ya tünd qəhvəyi rəngə boyamayın; tünd boya sıx yay günəşini udur və daxili çənin təzyiqini 375 psi relyef klapanın açılma nöqtəsindən yuxarı qaldırır.
- Yeraltı çən günbəzinizi hündür qar payı ilə işarələyin: Qışda qarın çox olduğu bölgələrdə propan çəninin günbəzinin və tənzimləyicinizin yanında 1,8 metrlik (6 fut) şüşə lifli yüksək görünən marker dirəyi sürün ki, qartəmizləyən maşın sürücüləri və qartəmizləyənlər heç vaxt mis xəttə dəyməsin və ya tənzimləyicini basdırmasın.
Ailənin yanğın təhlükəsizliyi və yanıq üçün ilk yardım kursunu keçin
Qaz sızmalarını necə tanıyacağınızı bilmək, 60 saniyəlik evdə evakuasiya məşqini yerinə yetirmək və ani termal yanıqları və ya kriogen dondurmanı müalicə etmək kənd yanğınsöndürmə şöbələri gəlməmişdən əvvəl bir həyatını xilas edə bilər. Qırmızı Xaç və ya St John Ambulans tərəfindən sertifikatlaşdırılmış ilk yardım və CPR kursunu tamamlayın və ildə iki dəfə ailənizlə açıq havada görüş keçirin.
Tez-tez verilən suallar¶
How is a propane leak inside a house different from a natural gas leak?
Natural gas (methane) is lighter than air (specific gravity 0.60), so when it leaks it rises toward the ceiling and upper floors. Propane is 1.52 times heavier than air, meaning leaking propane sinks straight to the floor like invisible water, flows down basement stairs, and pools deep inside basements, crawlspaces, and floor drains. Because it pools at floor level right where water heater pilot lights, furnace igniters, and sump pump switches sit, a basement propane leak can detonate before anyone upstairs even smells a strong odor.
What is "odorant fade," and how can a basement fill with explosive propane without smelling like rotten eggs?
Propane is naturally odorless, so suppliers add ethyl mercaptan to give it a rotten-egg smell. However, if an underground propane pipe leaks outside your house, the surrounding soil acts as a chemical filter that strips the ethyl mercaptan out of the gas as the odorless propane travels along the pipe trench through your basement wall. Internal rust inside a damp tank can also oxidize the odorant. Because odorant fade can render a leak completely odorless, every propane home must have an UL 1484 explosive gas detector mounted within 15 to 30 centimeters (6 to 12 inches) of the basement floor.
Why must you never flip a light switch OFF or use a cell phone when evacuating a propane leak?
Propane ignites in air at concentrations as low as 2.1 percent. Flipping a wall light switch ON or OFF creates a tiny electrical arc between the brass contacts inside the wall box that is more than hot enough to detonate a room filled with propane vapor. Similarly, unplugging an appliance, pressing an electric garage door opener button, or dropping a non-intrinsically safe cell phone can produce an ignition spark. Leave all switches untouched and walk out immediately.
How do you shut off a large residential outdoor propane tank in an emergency?
Only approach the outdoor tank if it is upwind, not on fire, and not spraying liquid frost. Lift the hinged metal dome lid on top of the tank, locate the round brass or metal Service Shutoff Handwheel Valve connected to the copper outlet pipe, and turn the handwheel clockwise (to the right, "righty-tighty") until it stops. Unlike a municipal natural gas meter, a propane tank handwheel does not require a wrench.
Why should you never use a fire extinguisher to put out a flame shooting from a leaking propane tank unless you can shut the valve off?
While a jet of flame shooting out of a propane cylinder valve looks terrifying, that flame is safely consuming the escaping propane gas in open air. If you extinguish the flame with a dry chemical extinguisher while pressurized propane continues pouring out of the open valve, the unburned heavier-than-air propane gas will immediately sink, spread across the ground or into your house, and ignite in a catastrophic vapor-cloud explosion the moment it touches a distant spark or pilot light.
What is a BLEVE, and what are the warning signs that a propane tank in a fire is about to explode?
A BLEVE (Boiling Liquid Expanding Vapor Explosion) occurs when fire heats a pressurized liquid propane tank. Although the spring-loaded relief valve pops open to vent pressure, flames heating the dry upper steel wall above the boiling liquid level soften the steel past 600 degrees Celsius (1,100 degrees Fahrenheit) until the tank rips open, flashing all the liquid propane into a massive fireball in a fraction of a second. Warning signs of an imminent BLEVE include a deafening jet-engine roar of flame shooting from the relief valve, a steadily rising whistling pitch, and blistering paint or glowing metal on the upper shell. Evacuate 300 to 800 meters (1,000 feet to 1/2 mile) away behind solid building cover immediately.
Mənbələr yoxlanılıb¶
- Milli Yanğından Mühafizə Assosiasiyası (NFPA, Amerika Birləşmiş Ştatları): NFPA 58 (Mayeləşdirilmiş Neft Qazı Məcəlləsi) və NFPA 54 (Milli Yanacaq Qazı Kodu: Sızma Testi, Odorantların Solması və Silindr Saxlama Standartları).
- Amerika Birləşmiş Ştatları Kimyəvi Təhlükəsizliyi və Təhlükəsizliyi Araşdırma Şurası (CSB, Amerika Birləşmiş Ştatları): Propan Odorantının Solması, Yeraltı Boru Miqrasiyası və Yaşayış zirzəmisində Partlayışlar Haqqında Təhlükəsizlik Bülletenləri.
- Amerika Birləşmiş Ştatları Nəqliyyat Departamenti (DOT / PHMSA), Nəqliyyat Kanadası və İnfrastruktur, Rabitə və Nəqliyyat Katibliyi (Meksika): Fövqəladə Hallara Müdaxilə Bələdçisi (ERG Guide 115: Qazlar - Yanan, Soyudulmuş Mayelər / LPG BLEVE Evakuasiya Məsafələri daxil olmaqla).
- Sağlamlıq və Təhlükəsizlik üzrə İcraçı (HSE) və Liquid Gas UK (Birləşmiş Krallıq): Mayeləşdirilmiş Neft Qazının (LPG) məişət və kommersiya binalarında təhlükəsiz istifadəsi və saxlanması.
- Propan Təhsili və Tədqiqat Şurası (PERC, Amerika Birləşmiş Ştatları): İstehlakçı Propan Təhlükəsizliyi Təlimatları, Daşqın və Qış Hava Anbar Protokolları və Fövqəladə Hallara Müdaxilənin BLEVE Təlimi.