scope:

This Standard specifies the measuring method of absolute vapour pressure at 37.8 °C of volatile and non-viscous petroleum products in accordance with the Reid method.

For petroleum products containing oxygenated hydrocarbons covered by this Standard, the maximum concentration of ethers containing 5 or more carbon atoms is 15 %, and for ethanol, 10 %, and for alcohols containing 3 or more carbon atoms, 7 %.

When applying this test method to volatile crude petroleum with a vapour pressure exceeding 10 kPa, the precision in clause 13 can not be applied.

Four procedures are described in this Standard. Procedures A and B are for crude petroleum and petroleum products, excluding aviation gasolines, with a vapour pressure up to 180 kPa, Procedure C is applied to petroleum products with a vapour pressure above 180 kPa, and Procedure D applies to aviation gasolines with a maximum vapour pressure of 50 kPa.

NOTE 1 For all the test methods contained in JIS K 2258 series, see Annex JA.

NOTE 2 For product samples containing methanol or those containing oxygenated hydrocarbons exceeding the limits given in the above scope, the method described in JIS K 2258-2 can be applied. For liquefied petroleum gas, the method described in JIS K 2240 can be applied.

NOTE 3 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 3007: 1999 Petroleum products and crude petroleum-Determination of vapourpressure-Reid method (MOD)

The symbols which denote the degree of correspondence in the contents between JIS and the corresponding International Standard are IDT (identical), MOD (modified) and NEQ (not equivalent) according to ISO/IEC Guide 21.