Page 29

NORA Oilheat Technicians Manual

good fuel. The purpose of this test is to visually determine the possible presence of contaminants and water in the fuel. Fill a clean white bucket half way with fuel and let the sample stand for a minute to remove the air bubbles. Place the bucket on a level surface with good light in the bucket. Inspect the fuel, it should be clear and bright with no water, or solids. It should not be hazy or cloudy, and there should be no brown or black slime. Drop a shiny coin into the bucket. If you can easily read the date, the fuel is probably OK. The fuel should also smell “normal.” Strange odors can indicate problems. With either the ‘clear and bright’ or ‘white bucket’ test, a haze caused by wax crystals may appear in the fuel if it is too cold. A haze in fuel that is not too cold may be due to contamination with water. Visual detection of bacterial contamination The ‘clear and bright’ and ‘white bucket’ tests can also be used for testing tank bottoms, filter cans, and fuel pump drainings for the presence of microorganisms and sludge. There will be evidence that can be seen and smelled. Put the fuel into a clean white bucket or clear glass jar. Allow the sample to settle for two minutes. Tip or swirl the container from side to side, looking for any evidence of dark colored solids, dark colored water, substances that cling to the side of the container, or a scummy mucus like material. Hold the sample in front of a light. Check to see if the solids are rust. Move a small magnet along the outside of the container. Rust particles will collect and follow the magnet. If the sample is a dark-colored, sludge-like material and it does not respond Chapter 2—Heating Oil and Its Properties 2-9 Quick tests for fuel quality: Clear and bright test The purpose of this test is to detect possible water or solid contaminants in the fuel by visual inspection. Using a clean glass container, take the sample at the bleed port of the fuel unit. Be sure the fuel sample tap (the bleed valve) is clean and free of loose contaminates by flushing it out at maximum flow before drawing a sample. Let the sample settle for a minute to remove the air bubbles. Observe the sample against a light background for a clear bright condition. The sample should look more like cranberry juice than red wine. Swirl the container to create a whirlpool. Free water and solids tend to collect at the bottom of the whirlpool. The term “clear and bright” does not refer to color. “Clear and bright” fuel has no floating or suspended matter, and no free water. Bright fuel tends to sparkle. White bucket test This is a good quick test for drivers to be sure you are filling your truck with Chapter 2 Heating Oil Slight Haze Ice Base Fuel with Water Below Freezing Point Base Fuel


NORA Oilheat Technicians Manual
To see the actual publication please follow the link above