Which pair of test parameters correctly represents the volumes used for BS&W and DFWD testing?

• A. 100 mL and 200 mL
• B. 200 mL and 100 mL
• C. 100 mL and 800 mL
• D. 200 mL and 800 mL

Answer: (A)

Understanding how much sample you use is about matching volume to instrument capacity and to get a representative reading. For BS&W testing, 100 mL is standard because this amount fits well in the measurement vessel and provides enough material for the bottom sediment and water to separate clearly without overflowing. Using this moderate volume helps you obtain a reliable, repeatable reading of how much impurity (sediment and water) is in the fuel.

For the DFWD test, 200 mL is used to ensure there’s ample liquid for the distillation/measurement steps so the results aren’t dominated by sampling error. A larger volume helps achieve a representative sample and smoother operation of the procedure, while staying within the equipment’s practical limits.

So, 100 mL for BS&W and 200 mL for DFWD aligns with how these tests are typically performed to balance accuracy and equipment constraints. The other volume pairings would either overload the apparatus or provide an unrepresentative sample.