Astm D95 Pdf !exclusive! May 2026

Understanding ASTM D95: The Standard for Water in Petroleum Products

Unlike Karl Fischer titration (ASTM D6304), which measures trace water, ASTM D95 is designed for higher water concentrations, typically ranging from 0.1% to 25% by volume. Astm D95 Pdf

1. Sample preparation: A representative sample of crude oil is taken from the shipment or storage tank.
2. Centrifuge preparation: A centrifuge tube is filled with the crude oil sample, and a solvent (usually a mixture of toluene and isopropanol) is added to help dissolve the oil and facilitate separation of water and sediment.
3. Centrifugation: The centrifuge tube is then spun at a specified speed (typically 3,000 rpm) for a set period (usually 10-15 minutes).
4. Measurement: After centrifugation, the volume of water and sediment is measured directly from the centrifuge tube.

Measurement: The volume of water in the trap is measured to calculate the water percentage of the original sample, typically in a range from 0% to 25% by volume. Standard Specifications & Access Understanding ASTM D95: The Standard for Water in

Summary of ASTM D95 – Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation

Title

ASTM D95-13(2018) (current active version) – Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation Sample preparation : A representative sample of crude

Q2: Can ASTM D95 detect dissolved water?

A: No. It measures free water and emulsified water. Dissolved water (below the saturation point) is not detected. For that, use Karl Fischer titration.

Procedure (Abbreviated)

1. Measure 100 mL of sample into the distillation flask.
2. Add 100 mL of solvent (toluene or xylene).
3. Assemble the apparatus.
4. Heat to boil; distill at 2–5 drops per second.
5. Continue until no more water is collected and the upper solvent layer is clear.
6. Cool, read water volume in the trap.