(7) Flammable & Combustible Liquids

¡Supera tus tareas y exámenes ahora con Quizwiz!

Flammable Class 1 Liquids:

- Class IA - Class IB - Class IC

Storage:

Storage of flammable and combustible liquids is usually a necessity. Whenever flammable and combustible liquids are stored improperly they become a significant fire hazard.

Maximum Quantities Outside of a Flammable Storage Cabinet or Inside Storage Room:

- 25gallons of Class IA Liquids in Containers - 120gallons of Class IB, IC, II or III Liquids in Containers OR A Single Portable Tank

Maximum Quantities Inside of a Flammable Storage Cabinet or Inside Storage Room:

- 60gallons of Class I or II - 120gallons of Class III

Combustible Liquids Classes:

- Class II - Class IIIA - Class IIIB

Handling Liquids at Point of Final Use:

- Flammable liquids shall be kept in covered containers when not actually in use. - Where flammable or combustible liquids are used or handled, except in closed containers, means shall be provided to dispose promptly and safely of leakage or spills. Flammable or combustible liquids shall be drawn only in the following manner: ❖ Through a closed piping system ❖ From safety cans ❖ By means of a device drawing through the top ❖Transfer operations must be provided with adequate ventilation. Sources of ignition are not permitted in areas where flammable vapors may travel.

Transferring of Flammable Liquids:

- Liquid transfer shall be through: ❖ A device drawing through the top of the drum ❖ By gravity through an approved self- closing valve. - Transfer by air pressure is prohibited. - Containers from which flammable liquids are dispensed are to be grounded and bonded to avoid fire due to static electricity. - Flammable liquids are only to be dispensed into approved safety cans.

Maximum Number of Flammable Storage Cabinets Allowed in Any One Fire Area:

- Non-sprinklered Area: 3/fire area - Cabinets separated by 100ft: 3/100ft of travel distance - Automatic Sprinkler System: 6/fire area

Handling Liquids at Point of Final Use

- To understand flammable and combustible liquids, it is important to know that it is the vapor, not the liquid, that burns. - Although the tank is empty, its vapor space contains gasoline vapors. - If the vapor concentration is within the explosive range and a source of ignition is introduced, an explosion probably will occur.

Cautions for Transferring Flammable or Combustible Liquids:

- Transferring liquids by means of air pressure on the container is prohibited. This may result in an overpressure which could exceed what the container could withstand. - In addition, a flammable atmosphere could be created within the container. This atmosphere would be particularly sensitive to ignition because of the increased pressure.

The Explosive Range of Gasoline.

0%-2.5%: Too Less Fuel (hydrocarbons) 2.5%-9.5%: Flammable Range 9.5%-30%: Too Less Air/O2

The following work practices must be followed when handling flammable and combustible liquids:

1) Flammable liquids must be kept in covered containers when not in use. 2) Flammable and combustible liquids must be stored only in acceptable containers. 3) Where flammable or combustible liquids are used or handled, except in closed containers, means shall be provided to dispose of leaked or spilled liquid promptly and safely.

Combustible Liquid:

Any liquid having a flash point at or above 100F/37.8C.

Flammable Liquids:

Any liquid having a flash point below 100F/37.8C, except any mixture having components with flashpoints of 100F /37.8C or higher, the total of which make up 99% or more of the total volume of the mixture.

Class IA:

Flashpoint: <73F Boiling Point: <100F Examples: - Ethyl ether - Heptane - Pentane - Propylene oxide - Vinyl chloride

Class IB:

Flashpoint: <73F Boiling Point: ≥100F Examples: - Acetone - Ethanol - Gasoline - Isopropyl alcohol - Methanol - Methyl ethyl ketone - Octane - Toluene

Class II:

Flashpoint: ≥100F & ≤140F Examples: - Diesel fuel - Fuel oil - Kerosene - Motor oil

Class IIIA:

Flashpoint: ≥140F & ≤200F Examples: - Furfural - Linseed oil - Mineral oil - Oil-based paints

Class IIIB:

Flashpoint: ≥200F Examples: - Ethylene glycol - Glycerine - Neatsfoot oil

Class 1C:

Flashpoint: ≥73F & <100F Boiling Point: ALL boiling points Examples: - Isobutyl alcohol - Mineral Spirits - Styrene Monomer - Turpentine - Xylene

Upper Explosive Limit (UEL):

The maximum vapor concentration (by %) in which a liquid can form an ignitable mixture in air is called the "upper explosive limit." Above this limit, vapor concentration is too rich to support combustion.

Lower Explosive Limit (LEL):

The minimum vapor concentration (by %) in which a liquid can form an ignitable mixture in air is called the "lower explosive limit." Below this limit, vapor concentration is too lean to support combustion.

Explosive Range/Flammable Range:

The range between the LEL and UEL is the "explosive range." If a source of ignition, such as a flame, spark, or static electricity, is present, an explosion may occur.


Conjuntos de estudio relacionados

Study Guide Chapter 1.8 (Emphasis and Focal Point)

View Set

6.1 Exchange between organisms and their environment

View Set

exercise 6 - classification of tissues *CONNECTIVE TISSUE*

View Set

Diversity in the Workplace Final

View Set

Technology and its effects on modern america

View Set

The American Red Cross CPR Quiz Answers

View Set