Test Methods for Water Content in Petroleum Products

Test Methods for Water Content in Petroleum Products
Petroleum products refer to the general term for various commodities obtained through processing, using petroleum or a certain part of petroleum as raw materials. Different from unprocessed crude oil (a dark brown viscous liquid), they are the products of crude oil processed in refineries. There is a wide variety of petroleum products, which can be mainly divided into the following six major categories: fuels, solvents and chemical raw materials, lubricants, paraffin and its products, petroleum asphalt, and petroleum coke.
Purpose of the Experiment
The main purposes of determining the water content in petroleum products are to ensure the quality of the oil products, guarantee production safety, and optimize application performance. By measuring the water content, the actual quantity of the oil products can be accurately calculated.
The presence of water can cause various hazards to the use and production process of petroleum products: triggering low-temperature failures; water can promote the oxidation and gelatinization of oil products, shortening their service life; and damaging the lubrication system.
Based on the determination results of water content, appropriate dehydration methods can be identified, and the production process can be controlled.
Experimental Instruments & Samples
Experimental Samples：Petroleum Products
Experimental Instrument：SH103A automatic trace moisture meter Complying with the standard ASTM D1744

Testing method
1.Titration Operation: Add the sample solvent (with Karl Fischer reagent already added) into the titration flask, then add the prepared oil sample into the flask, and ensure the sample is completely dissolved.
2.Data Recording: Record the volume of Karl Fischer reagent consumed during the titration process.‌
Experimental Results
The measured water content is all below 50 ppm, which is far lower than the requirement of GB 36170-2018 (≤0.5% water content in crude oil, equivalent to 5000 ppm), indicating that the oil product is of excellent quality.