The standard, officially titled the "Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation," is a critical analytical protocol in the petrochemical and fuel industries. It provides a standardized procedure for determining the water content—ranging from 0% to 25% by volume—in materials such as crude oil, tars, and other bituminous substances.
Crude oil is sold by volume; however, water content (often referred to as Basic Sediment and Water, or BS&W) is an impurity. Buyers utilize ASTM D95 to ensure they are paying for oil, not water.
| Area | Impact | |---|---| | | Water interferes with catalytic cracking, hydrotreating, and other refinery operations, reducing efficiency and increasing energy consumption | | Custody Transfer | The measured water volume is used to correct the total volume transferred between parties—critical for fair trade | | Product Quality | Excessive water can cause corrosion, oxidation, additive precipitation, and reduced lubricity | | Contractual Compliance | Allowable water limits are often specified in purchase and sales contracts | | Equipment Protection | Water in lubricating oils increases oxidation rates, prematurely depleting oxidation inhibitors and causing corrosion, erosion, and hydrogen embrittlement |
The volume of the separated water is measured directly from the graduations on the trap and expressed as a percentage of the original sample volume. Apparatus and Safety Astm D95 Pdf
The ASTM D95 glassware set typically includes a glass or metal still (boiling flask), an electric heater or burner, a reflux condenser, and the graduated trap. Maintaining is essential for accuracy and safety, often requiring ground glass joints or O-rings for metal-to-glass connections. A thin film of stopcock grease is recommended to prevent these joints from "freezing" or seizing during the high-heat process. Industrial Significance and Quality Control
Water in lubricating oils accelerates oxidation, degrades additives, and leads to component rust. Monitoring water content prevents catastrophic mechanical failures in turbines, engines, and gearboxes. Fiscal Custody Transfer
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. The standard, officially titled the "Standard Test Method
In the complex world of petroleum products, lubricants, and industrial chemicals, the presence of water is more than a minor impurity; it is a critical determinant of quality, safety, and performance. Water contamination can lead to corrosion, loss of lubrication efficiency, and catastrophic failure in machinery. For decades, the industry standard for quantifying this contamination has been ASTM D95, formally titled "Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation." While the digital age has transformed how engineers access this document—often seeking it as a "PDF" download—the content within remains a cornerstone of analytical chemistry in the hydrocarbon industry.
A precise mixture of the tested hydrocarbon and a water-immiscible carrier solvent (such as xylene or toluene) is systematically boiled. As heating takes place, the carrier solvent and the locked moisture content vaporize simultaneously. The combined vapors rise directly into a designated reflux condenser. Once chilled back to a liquid state, the mixed fluid drains downward into a specialized graduated collection trap.
To ensure you are working with the correct, current, and legally valid version of the standard, you must obtain it from official sources. Buyers utilize ASTM D95 to ensure they are
The condensed liquids drop into a graduated glass trap. Because water has a higher density than the solvent, it sinks to the bottom of the trap. The lighter solvent overflows back into the distillation flask.
Industrial-grade xylene, toluene, or petroleum naphtha, depending on the specific material being tested. Step-by-Step Testing Procedure
Water reacts with sulfur compounds to form acids that corrode storage tanks and engines.