What volume of F76 is used in the BS&W test?

• A. 100 mL
• B. 50 mL
• C. 200 mL
• D. 150 mL

Answer: (A)

In this test, the amount of fuel you start with is kept at a fixed volume to ensure you get a clear, readable separation of water and sediment. For F76, using 100 milliliters of fuel in the BS&W tube provides a measurable bottom layer and interface that the tube’s scale is calibrated for, giving reliable, reproducible results after settling or centrifugation. If you used less, the sediment and water might be too small to read accurately, increasing measurement error. If you used more, the tube could be overfilled and the separation becomes harder to interpret, or the process would take longer. So, 100 mL is chosen to balance readability, precision, and practicality, keeping results consistent.