Rajan Wilcox
Water in a fuel tank can cause engines to stall or even stop functioning, so it's important to be able to detect and measure water levels. There are several ways to do this, including using a water-in-fuel sensor, water-finding paste, or a dipstick. The dimensions of the tank will also need to be considered, as well as its volume and the amount of liquid it contains.
Characteristics and Values of Measuring Water in a Fuel Tank
| Characteristics | Values |
|---|---|
| Water accumulation in fuel tanks | Can cause engine stalling and reduce engine efficiency |
| Common causes of water in fuel tanks | Condensation when the tank is opened |
| Methods to detect water in fuel tanks | Water-in-fuel level sensors, water-finding pastes, dipsticks, flexible string |
| Sensor functionality | Alarm goes off when probe tips come into contact with water; supports ohm, PNP, or NPN switch signals |
| Sensor customization | Can detect fuel temperature |
| Recommended frequency of testing | At every oil delivery or at least once a year |
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What You'll Learn
Using water-finding paste
Water-finding paste is a simple and effective way to determine the volume of water in a fuel tank. Water-finding pastes are designed to react with water, changing colour when coming into contact with it. This colour change indicates the water depth, and thus the volume of water in the tank.
To use water-finding paste, you will need to apply the paste to a measuring instrument, such as a gauge tape with a plumb bob. Plumb bobs are typically made from brass to avoid creating sparks with other metal objects. You can also use sticks or rods marked in US or Metric divisions to measure the water level, which is a cost-effective method for smaller storage tanks.
Before lowering the measuring instrument into the tank, spread the water-finding paste onto the bob or stick. The paste will react with the water, changing colour to indicate the water level. Different pastes will change colour in different ways; some will turn red, others pinkish-red, and some will turn yellow when they come into contact with water.
Water-finding pastes are designed to work with a variety of fuels, including gasoline, diesel, kerosene, and petroleum. They are also suitable for use in extreme temperatures, ensuring reliable detection of water in fuel.
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Water in fuel level sensors
One type of sensor is the single-point level switch, which can be used for reliable and accurate tank level detection. These sensors come in a variety of sizes, mountings, and materials, and can utilise different sensing technologies, such as float-level sensors, electro-optic level switches, capacitive level sensors, and ultrasonic level sensors. Single-point level switches offer flexibility in their customisation to suit specific requirements.
Another type of sensor is the Holykell water-in-fuel sensor (WIF sensor), which is designed with a submersible-type structure to monitor water presence in diesel/fuel tanks. This sensor uses a capacitance-based detection method, where changes in capacitance generate an electrical signal, triggering an alert or alarm to warn the user about the presence of water.
Additionally, the Gems Sensors single-point level switch is a sensor that can be used to detect water levels in fuel tanks. It has a 316L stainless steel probe that accurately calculates the water level and alerts users when the tank reaches its maximum capacity. This sensor is particularly useful in regions with high rainfall, where excess water in diesel tanks can be a common issue.
To measure the level of water in a fuel tank, there are also some simple do-it-yourself methods available. One method involves using water-finding paste, which can be applied to a dipstick and inserted into the tank to measure water levels. Another approach includes using flexible string or other similar means to assess water contamination. While these methods are not as sophisticated as the sensors mentioned above, they can still provide basic indications of water presence in fuel tanks.
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Measuring oil tank water contamination
Water contamination in oil tanks is a common problem, especially during warmer months and in partially filled fuel tanks. It can cause a host of issues, from corrosion and sludge build-up to equipment failure. To prevent these problems, it is important to regularly test for water contamination and address any issues promptly.
One simple method to test for water contamination in oil tanks is to use water-finding pastes, also known as water detection pastes. These pastes change colour when they come into contact with water. To use this method, apply the paste on a stick and gently place it inside the tank until it reaches the bottom. Leave it for about 30 seconds, then carefully remove it. If the paste has changed colour, water is present in the tank.
Another approach is to use a dipstick. Coat a dipstick with a water-finding paste and insert it into the oil tank. This method is suitable for tanks with a fill pipe located directly above the tank.
There are also other water-sensing products available, such as sensors connected to a string or wire that can be lowered into the tank to detect water. Additionally, visual checks of the oil filter at the oil burner can indicate a history of water passing through the system. Water in the oil filter or signs of rust suggest water contamination.
If water contamination is detected, it is important to take remedial action. For small levels of contamination, professional engineers can clean the tank and restore the fuel. However, severe contamination may require a fresh supply of fuel and even a replacement fuel tank to prevent cross-contamination.
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Dipsticks
A dipstick is a graduated measuring device that can be used to measure the amount of water in a fuel tank. It can be calibrated or uncalibrated. A calibrated dipstick will accurately tell you how much water is in your tank by measuring the number of gallons, whereas an uncalibrated dipstick will measure the number of inches of water.
To calibrate a dipstick, start with an empty tank. Add one gallon of water, insert the stick, and mark the wet line on the stick. Continue this process, adding more water and marking the wet line after each addition, until the tank is full. This will give you a calibrated dipstick that you can use to accurately measure the water level in your fuel tank.
When using a dipstick, it is important to wear gloves to prevent any allergic reaction to the fuel and to avoid getting the smell of fuel on your hands. Familiarize yourself with the volume units on the dipstick, which are usually marked in litres or gallons. Lower the dipstick slowly into the tank until the interface between the wet and dry areas is apparent. Note the reading by estimating the distance from the last wet engraved line to the one above it. For example, if the wet line is at 800 litres and the dry line is at 1000 litres, and the liquid level is estimated to be 3/4 of the way between them, then the reading would be 800 + 3/4 of 200 = 950 litres. Dry the dipstick and take a second reading to check the accuracy of the first one.
While dipsticks provide an accurate measurement of the water level in a fuel tank, they can be time-consuming to use, especially if you are alone. Therefore, it is often recommended to combine dipstick measurements with fuel gauge readings for a more efficient and comprehensive evaluation of fuel levels.
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Flexible string
Water in a fuel tank can have dangerous and costly consequences. It can lead to anything from intermittent power loss to engine failure. Therefore, it is important to perform regular tank maintenance and testing.
One way to test for water in a fuel storage tank is to use a water-detecting paste, such as Kolor Kut. This paste is applied to a weighted string and dipped to the bottom of the tank. If the paste comes into contact with water, it will change colour, typically towards the bottom as water is denser than oil, and this will indicate the depth of the water present.
To use this method, first cover a long piece of flexible string in the paste. Then, insert the string into the tank until it hits the bottom. Wait for 30 seconds, and slowly bring the string back up. If there is water in the tank, the paste will have changed colour, and the amount of colour change will indicate how much water is in the tank.
Alternatively, you can use a magnetostrictive probe, which is capable of measuring fuel and water to 1/1000th of an inch. A flexible probe can be used in aboveground tanks larger than 20 feet tall and can monitor tanks up to 70 feet.
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Frequently asked questions
Water can get into your fuel tank through condensation whenever you open your tank, and this can cause engine stalling and reduce engine efficiency. You can use a water-in-fuel level sensor to detect water in your fuel tank.
A water-in-fuel level sensor is a device that can be wired with a relay device such as an alarm. When the sensor is placed in the tank, it will detect the presence of water and cause the alarm to go off.
You can use water-finding paste or a dipstick to measure the water level in your fuel tank.
Once you know the dimensions of your tank, you can use a tank volume calculator to calculate its volume. You will need to input the tank's measurements, including its length, width, and height, and select the appropriate measurement units.
