GB/T 3536-2008Petroleum products -- Determination of flash and fire points -- Cleveland open cup method (English PDF)

Foreword

This Standard revises and adopts the international standard ISO 2592: 2000

Determination of flash and fire points - Cleveland open cup method (English version).

This Standard is re-drafted according to ISO 2592:2000.

For convenience, a comparison list of the clauses of this Standard and those of ISO

2592:2000 is given in Appendix C.

In order to suit our country's national conditions, this Standard has been modified when

adopting ISO 2592:2000. The main differences between this Standard and ISO

2592:2000 are as follows:

-- Revise the name of this Standard from Determination of flash and fire points -

Cleveland open cup method to Petroleum products - Determination of flash and

fire points - Cleveland open cup method, and modify the English name

accordingly;

-- Modify the referenced standards in ISO 2592:2000 to the corresponding current

national standards and industry standards in our country;

-- In the result expression of this Standard, change "rounded to the nearest even

number" to "rounded to an integer";

-- Remove Appendix B "Thermometer specification" in ISO 2592:2000, and directly

quote the GB-5 thermometer in GB/T 514, which is consistent with the

thermometer specification requirements of ISO 2592:2000.

For the convenience of use, this Standard has made the following editorial changes:

-- Modify the text expressions of repetition and reproducibility according to the

customs of our country.

This Standard replaces GB/T 3536-1983 Petroleum products - Determination of flash

and fire points - Cleveland open cup method. GB/T 3536-1983 is equivalent to ISO

2592:1973.

Compared with GB/T 3536-1983, the main changes of this Standard are as follows:

-- Add the use of automated equipment to this Standard;

-- Add the verification content of apparatus in the clause Preparation of apparatus,

and give specific instructions in Appendix B "Verification of apparatus";

-- Add the clause Sampling and the clause Sample preparation;

-- In this Standard, add the content "If a foam persists in the final stages of the test,

discard the result";

-- In this Standard, add the content "When the temperature at which the flash point

is observed is less than 18 °C from the temperature of the first application of the

test flame, the result is not valid";

-- In GB/T 3536-1983, the barometric pressure is corrected in sections when the

barometric pressure is lower than 95.3 kPa, and is corrected separately by 2 °C,

4 °C and 6 °C; in this Standard, the barometric pressure is uniformly calculated

and corrected by an equation;

-- Revise the reproducibility of flash point in this Standard from 16 °C to 17 °C;

-- Remove Appendix B "Thermometer specification" in GB/T 3536-1983, and

change the thermometer to GB-5 thermometer in accordance with GB/T 514;

-- Add Appendix B "Verification of apparatus" in this Standard.

Appendix A of this Standard is normative; Appendix B and Appendix C are informative.

This Standard was proposed by the National Technical Committee on Petroleum

Products and Lubricants of Standardization Administration of China.

This Standard shall be under the jurisdiction of Subcommittee on Petroleum Fuels and

Lubricants of National Technical Committee on Petroleum Products and Lubricants of

Standardization Administration of China.

The drafting organizations of this Standard: SINOPEC Research Institute of Petroleum

Processing.

The drafters of this Standard: Chen Jie, Guo Tao.

The previous standard version replaced by this Standard is:

-- GB/T 3536-1983.

Petroleum products - Determination of flash and fire points -

Cleveland open cup method

Warning: The use of this Standard may involve hazardous materials, operations

and equipment. This Standard does not purport to address all of the safety

problems associated with its use. It is the responsibility of the user of this Standard

to establish appropriate safety and health practices and determine the

applicability of regulatory limitations prior to use.

1 Scope

This Standard specifies a procedure for the determination of flash and fire points of

petroleum products using the Cleveland open cup apparatus. It is applicable to

petroleum products having an open cup flash point above 79 °C, except fuel oils, which

are most commonly tested by the procedure described in GB/T 261.

Note: Flash point and fire point are indications of the ability of a substance to form a

flammable mixture with air under controlled conditions, and then to support

combustion. Flash point and fire point are only two of a number of properties

that may contribute towards the assessment of overall flammability and

combustibility of a material.

2 Normative references

The following normative documents contain provisions which, through reference in this

test, constitute provisions of this Standard. For dated references, all subsequent

amendments (not including errata content) or revisions do not apply to this Standard.

However, parties to agreements that are based on this Standard are encouraged to study

whether the latest versions of these documents can be used. For undated references, the

latest edition applies to this Standard.

GB/T 261, Determination of flash point - Pensky-Martens closed cup method (GB/T

261-2008, ISO 2719:2002, MOD)

GB/T 514, Specification for liquid-in-glass thermometers for testing of petroleum

products

GB/T 4756, Method for manual sampling of petroleum liquids (GB/T 4756-1998,

eqv ISO 3170:1988)

outside of the apparatus, empty, clean and refill it. Destroy or remove any air bubbles

or foam on the surface of the sample whilst maintaining the correct level of test portion

in the test cup. If a foam persists in the final stages of the test, discard the result.

14 °C/min ~ 17 °C/min. When the test portion temperature is approximately 56 °C

below the expected flash point, decrease the heat so that the rate of temperature rise for

the last 23 °C ± 5 °C before the expected flash point is 5 °C/min ~ 6 °C/min. During

the test, take care to avoid disturbing the vapours in the test cup by careless movements

or breathing near the test cup.

11 Procedure for determining fire point

6 °C/min. Continue the application of the test flame at 2 °C intervals until the vapour

of the test portion ignites and continues to burn for at least 5 s. Record the temperature

at this point as the observed fire point of the sample.