Table of Contents
Sources of ignition include electrical sparks, static electricity, naked flames, hot surfaces, impact, friction, etc.
Which of the following are examples of ignition sources?
Ignition sources may be: Flames; Direct fired space and process heating; Use of cigarettes/matches etc; Cutting and welding flames; Hot surfaces; Heated process vessels such as dryers and furnaces; Hot process vessels; Space heating equipment;.
Which of the following are potential ignition sources?
Potential ignition sources are those where sources of heat could get hot enough to ignite material found in the premises. These sources could include: Smokers’ material – such as cigarettes, matches and lighters. Naked flames – such as candles or gas open-flame equipment.
What is a source of ignition quizlet?
Terms in this set (25) The source of ignition of virtually every fire is heat. – Small open flames. – Matches.
What are the 3 sources of ignition?
Sources of ignition include electrical sparks, static electricity, naked flames, hot surfaces, impact, friction, etc.
How many sources of ignition are there?
There are 8 types of ignition sources, each with different heat intensity. They are classified from 1 to 8, the intensity doubling compared to the preceding source. The most frequently used are ignition source 0, 1 and 5.
Is thermal an ignition source?
There are 4 main categories of ignition sources: thermal, electrical, mechanical and chemical.
What is the most common form of ignition?
Forced ignition (i.e. external / piloted) is the most common form of accidental ignition. An external ignition source is classified as anything that can deliver enough energy in the form of heat to ignite a substance. This category includes sources such as open flames, electric arcs and sparks and mechanical sparks.
Is a boiler an ignition source?
Any equipment that heats up, whether deliberately or as a by-product of the energy used, can be a potential source of ignition. Boilers and cooking equipment are also common tools that are well known to heat up on the surface, as well as inside.
Which of the following are ignition sources OSHA?
Ignition sources can include any material, equipment or operation that emits a spark or flame—including obvious items, such as torches, as well as less obvious items, such as static electricity and grinding operations.
Which of the following is not considered source of ignition?
‘ Electrical equipment is a source of ignition if it creates an arc or spark during operation. Electric wiring and junction boxes, for instance, are not considered sources of ignition. But most switches, panelboards, relays, and other devices that can create an arc when operated are treated as ignition sources.
When starting a fire common sources of ignition are?
The most common ignition sources are electricity and flammable liquids. Flammable chemicals, including gases and solids, and well as personal items such as lighters and matches, can also cause fires. Electricity: One of the most common workplace ignition sources is electricity.
What are the sources of ignition and give its meaning?
An ignition source is a process or event which can cause a fire or explosion. Open flames, sparks, static electricity, and hot surfaces are all possible ignition sources. An explosion can occur when flammable gases or vapors in the air come in contact with an ignition source such as a spark.
What are the main ignition sources in a workplace?
sources of ignition include heaters, lighting, naked flames, electrical equipment, smokers’ materials (cigarettes, matches etc), and anything else that can get very hot or cause sparks. sources of fuel include wood, paper, plastic, rubber or foam, loose packaging materials, waste rubbish and furniture.
Is Lightning an ignition source?
Lightning strike is an important ignition source of forest fires, resulting in great losses and harm. The mechanism of ignition is complex.
What is ignition in a fire?
Ignition refers to the marked transition of a system from a non-reactive equilibrium state to a self-sustaining reactive state. This change is often induced by an external stimulus (such as heat or a spark) that produces a thermochemical runaway in the system.
What are the 4 types of fire?
Classes of fire Class A. A class A fire is burning flammable solids as fuel. Class B. Class B fires are burning flammable liquids. Class C. Class C fires burn flammable gases. Class D. Class D fires are burning flammable metals. Electrical. Any fire involving electrical equipment is classed as an electrical fire. Class F.
What is the most common fire ignition source of the following choices?
Welding, torch cutting, and other hot work send sparks and molten material into the air, a common reason for combustible dust or flammable liquid to catch fire. Electrical wiring that is overloaded or not installed to code can cause a spark, creating an ignition source for combustible dust and flammable liquids.
What is ignition material?
The ignition times are short for polyester, vinyl ester and epoxy matrix composites, and these materials will ignite within 1–2 min when exposed to the heat flux of 50 kW/m2. These composites are the most flammable listed in Table 6.1, and there are other materials with better ignition resistance.
Is a receptacle a source of ignition?
Ignition Source: A flame, spark or hot surface capable of igniting flammable vapors or fumes. Electrical outlets do not meet the definition of an ignition source.
Can lightning start a fire?
Lightning plays an outsized role in wildfires: More than 40% of wildfires in the West, largely in places other than California, were caused by lightning, and those fires accounted for more than 70% of the acreage burned between 1992 and 2015, according to the U.S. Forest Service.
How does a lightning strike cause fire?
Lightning may serve as an ignition source of a fire by directly striking an object; by an arc discharge between two conductive objects at different induced potentials; by a current surge in circuitry and equipment resulting from an induced voltage; by the flow of substantial electrical current, which causes overheating.
Is lightning an exothermic reaction?
Technically lightning doesn’t have a temperature but the materials it passes through heat up, and the temperature can reach 30,000 °C. This causes the nitrogen and the oxygen in the air to react, producing nitrogen monoxide. This reaction has a high activation energy and is endothermic.
