ASTM E918 - 19

    Standard Practice for Determining Limits of Flammability of Chemicals at Elevated Temperature and Pressure

    Active Standard ASTM E918 | Developed by Subcommittee: E27.04

    Book of Standards Volume: 14.05


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    Significance and Use

    5.1 Knowledge of flammable limits at elevated temperatures and pressures is needed for safe and economical operation of some chemical processes. This information may be needed in order to start up a reactor without passing through a flammable range, to operate the reactor safely and economically, or to store or ship the product safely.

    5.2 Limits of flammability data obtained in relatively clean vessels must be carefully interpreted and may not always be applicable to industrial conditions. Surface effects due to carbon deposits and other materials can significantly affect limits of flammability, especially in the fuel-rich region. Refer to Bulletin 503 and Bulletin 627.

    1. Scope

    1.1 This practice covers the determination of the lower and upper concentration limits of flammability of combustible vapor-oxidant mixtures at temperatures up to 200°C and initial pressures up to as much as 1.38 MPa (200 psia). This practice is limited to mixtures which would have explosion pressures less than 13.79 MPa (2000 psia).

    1.2 This practice should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use.

    1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    Other Documents

    Bulletin503 Bureau of Mines, Limits of Flammability of Gases and Vapors, NTIS AD701575 Available from National Technical Information Service (NTIS), 5301 Shawnee Rd., Alexandria, VA 22312, http://www.ntis.gov.

    ASTM Standards

    E681 Test Method for Concentration Limits of Flammability of Chemicals (Vapors and Gases)

    E2079 Test Methods for Limiting Oxygen (Oxidant) Concentration in Gases and Vapors


    ICS Code

    ICS Number Code 13.220.40 (Ignitability and burning behaviour of materials and products); 71.100.01 (Products of the chemical industry in general)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/E0918-19

    Citation Format

    ASTM E918-19, Standard Practice for Determining Limits of Flammability of Chemicals at Elevated Temperature and Pressure, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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