Definition(s)

Flammable Liquid (Class MIII, and Class IC liquids)

A liquid having a flash point below l00°F (37.8°C) and having a vapor pressure not exceeding 40 lb per sq. in. absolute (276 kilopascals) at l00°F (37.8°C). Flammable (Class 1) liquids are subdivided into Classes IA, IB, and IC. (See NFPA 30.)

Source: API RP 14G, Recommended Practice for Fire Prevention and Control on Fixed Open-type Offshore Production Platforms: Upstream Segment, Fourth Edition, April 2007. Global Standards

Flammable liquid

Any liquid having a flashpoint below 100 °F (373 °C).

Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards

Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global Standards

 

Flammable Liquid

Liquid capable of producing a flammable vapour under any foreseeable operating conditions.

Source: IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous areas. Global Standards

 

Flammable Liquid

A liquid having a flash point below 100oF., (37.8oC) and having a vapor pressure not exceeding 40 lb. per sq. in. (absolute) (176 kPa) at 100oF (37.8oC) and shall be known as Class I liquid. Class I Liquids shall be subdivided as follows: Class IA shall include those having flash points below 73oF., (22.8oC.) and having a boiling point below 100oF., (37.8oC.). Class IB shall include those having flash points below 73oF., (22.8oC.) and having a boiling point at or above 100oF., (37.8oC.). Class IC shall include those having flash points at or above 73oF., (22.8oC.) and below 100oF., (37.8oC.).

Source: Petroleum Safety Orders–Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations

 

Flammable Liquid

“Flammable liquid” means any liquid having a flashpoint below 100°F. (37.8°C.), except any mixture having components with flash-points of 100°F. ( 37.8°C) or higher, the total of which make up ninety-nine (99) percent or more of the total volume of the mixture. Flammable liquids shall be known as Class I liquids. Class I liquids are divided into three classes as follows:

  1. Class IA shall include liquids having flashpoints below 73°F. (22.8°C.) and having a boiling point below 100°F. (37.8°C.). Example: LPG.
  2. Class IB shall include liquids having flashpoints below 73°F. (22.8°C.) and having a boiling point at or above 100°F. (37.8°C.) Example: Acetone, Methyl Ethyl Ketone.
  3. Class IC shall include liquids having flashpoints at or above 73°F. (22.8°C.) and below 100°F. (37.8°C.). Example: Turpentine.6

Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. Regulations

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