Revised Standard from Last Update.

1. Scope

1.1 This standard [P : 22] describes the procedure for determination of the heptane insoluble asphaltenes content present in gas oil, diesel fuel, residual fuel oils, lubricating oils, bitumen and crude petroleum which has been topped to an oil temperature of 260°C (see Annex A).

1.2 The precision is applicable to values between 0.5 and 30.0 percent m/m. The values outside this range may still be valid, but may not give the same precision values. Presence of additives in the oils may lead to imprecise results.

WARNING - This use of this standard may involve hazardous materials, operation 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.

2. References

The following standards contain provisions, which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

1448 Methods of test for petroleum and its products

[P :16] : 2014/ISO 3675 : 1998 Crude petroleum and liquid petroleum products - Laboratory determination of density - Hydrometer method

[P : 18] : 1991 Distillation of petroleum products

[P : 167] : 2018/ISO 12185 : 1996 Crude petroleum and petroleum products - Determination of density - Oscillating U-tube method.