JSA JIS K 2258-1

Abstract

This Standard specifies the measuring method of absolute vapour pressure at 37.8 &#176;C of volatile and non-viscous petroleum products in accordance with the Reid method. <br>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 <em>3</em> or more carbon atoms, 7 %. <br>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. <br>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. <br>NOTE 1 For all the test methods contained in JIS K 2258 series, see Annex JA. <br>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 <strong>2258-2</strong> can be applied. For liquefied petroleum gas, the method described in JIS K <strong>2240</strong> can be applied. <br>NOTE <em>3</em> The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows. <br>ISO 3007: 1999 <em>Petroleum products and crude petroleum-Determination of vapourpressure-Reid method</em> (MOD) <br>The symbols which denote the degree of correspondence in the contents between JIS and the corresponding International Standard are IDT (identical), <em>MOD</em> (modified) and NEQ (not equivalent) according to <strong>ISO/IEC</strong> Guide <strong>21</strong>.