Custody Tansfer Servo Tank Gauge with Water and Profiling

A custody transfer servo tank gauge is a device used in industries such as oil and gas to accurately measure and monitor the level of liquid (such as petroleum) in storage tanks during custody transfer. Custody transfer involves the transfer of ownership of the product, and accurate measurement is crucial for fair and precise transactions.

Here are some key features related to a custody transfer servo tank gauge with water and profiling:

  1. Servo Tank Gauge (STG): This is a type of instrument that uses servo technology to measure the level of liquid in a tank. It often employs a float connected to a servo motor, and the position of the float corresponds to the level of the liquid.
  2. Custody Transfer: The term “custody transfer” refers to the point in the supply chain where ownership of the product is transferred from one party to another. In the context of oil and gas, this is a critical phase where accurate measurement is essential for financial and regulatory purposes.
  3. Water Detection: In addition to measuring the product level, custody transfer servo tank gauges may include features for detecting the presence of water. This is important because water contamination in oil or other hydrocarbons can impact the quality and value of the product.
  4. Profiling: Profiling in this context likely refers to the ability of the tank gauge to provide detailed information about the distribution of the liquid within the tank. This can be useful for understanding tank behavior, identifying potential issues, and optimizing storage efficiency.

These systems are crucial in ensuring accurate measurement and preventing discrepancies during the transfer of custody. They often integrate advanced technologies to enhance precision, reliability, and data management capabilities.

Standard Model Portable Density Meter

A Standard Model Portable Density Meter is a device used to measure the density of a substance, typically a liquid. Density is defined as mass per unit volume, and it is an important physical property that can be used to identify and characterize materials.

The “Standard Model” likely refers to a specific model or series of portable density meters offered by a manufacturer. Different companies produce portable density meters with varying features, specifications, and measurement capabilities.

Here are some common features and aspects associated with portable density meters:

  1. Measurement Principle: Portable density meters typically use different measurement principles, such as oscillating U-tube, vibrating element, or the use of gamma radiation. Each method has its advantages and is suitable for different types of samples.
  2. Accuracy and Precision: The accuracy and precision of the density measurement are crucial for many applications. The portable density meter should provide reliable and repeatable results.
  3. Range of Measurement: The device should be capable of measuring a wide range of densities to accommodate different types of liquids or substances.
  4. Sample Handling: The ease of sample handling and the amount of sample required for measurement are important considerations. Some instruments may require smaller sample volumes than others.
  5. Temperature Compensation: Density is often temperature-dependent, so many portable density meters come equipped with temperature sensors and compensation features to provide accurate results across a range of temperatures.
  6. Data Storage and Connectivity: Many modern portable density meters offer features such as data storage, data logging, and connectivity options (USB, Bluetooth) for transferring data to a computer or other devices.
  7. Durability and Portability: Since these devices are designed to be portable, they should be durable and able to withstand the conditions of various work environments.
  8. Display and User Interface: A clear and user-friendly display is important for ease of use. Some devices may have touchscreen interfaces or other intuitive controls.

LNG tank gauging control of level

LNG tank gauging and control of level are critical aspects of managing the storage and transportation of LNG. The level in an LNG tank needs to be carefully monitored and controlled to ensure safe and efficient operations. Here are some key considerations for LNG tank gauging and level control:

Level Measurement Technologies:

  1. Radar Level Transmitters: These devices use radar waves to measure the distance from the transmitter to the liquid surface. They are commonly used in LNG tanks due to their accuracy and reliability.
  2. Ultrasonic Level Transmitters: Ultrasonic sensors use sound waves to measure the distance to the liquid surface. They are suitable for LNG applications but may be affected by factors like temperature and pressure changes.
  3. Differential Pressure Transmitters: These devices measure the pressure difference between the top and bottom of the LNG tank to infer the liquid level. They are suitable for pressurized tanks.

Temperature Compensation:

  • LNG is highly temperature-sensitive, and its volume changes with temperature variations. Accurate level measurement requires compensation for temperature changes to determine the actual liquid volume in the tank.

Pressure Control:

  • Monitoring and controlling the pressure in the LNG tank are crucial for maintaining the substance in its liquid state. Pressure sensors are employed to ensure that the tank pressure remains within safe operating limits.

Safety Systems:

  • Implement safety systems such as overfill protection and emergency shutdown procedures to prevent overfilling or other hazardous situations. These systems often include redundant level measurement devices and automatic shutdown mechanisms.

Remote Monitoring and Control:

  • Utilize remote monitoring systems to allow operators to view tank levels and conditions from a control room. This enhances safety and operational efficiency, particularly in large storage facilities or during transportation.

Automation and Control Systems:

  • Integrate tank level data into the overall automation and control systems. This allows for seamless coordination with other processes and ensures that the tank level is maintained within specified parameters.

Continuous Monitoring and Alarming:

  • Implement continuous monitoring of the LNG tank level and set up alarms for abnormal conditions. This ensures that any deviations from the normal operating range are detected promptly, allowing for corrective actions.

Regular Maintenance and Calibration:

  • Regularly maintain and calibrate level measurement instruments to ensure accuracy. Calibration is especially important due to the extreme conditions and temperature variations in LNG applications.

Human-Machine Interface (HMI):

  • Provide an intuitive HMI for operators to visualize the tank level, receive alerts, and interact with the control system. This facilitates quick decision-making and response in case of abnormal situations.

Compliance with Regulations:

  • Ensure that the LNG tank gauging and control systems comply with relevant safety and environmental regulations. This includes adherence to standards set by organizations such as the International Maritime Organization (IMO) and local regulatory bodies.

Properly designed and maintained LNG tank gauging and level control systems are essential for the safe and efficient handling of liquefied natural gas throughout its storage and transportation lifecycle. These systems contribute to operational safety, environmental protection, and overall system reliability.

Handheld Portable Density Meter

A handheld portable density meter is a device used to measure the density of a substance. Density is typically defined as mass per unit volume, and it is an important parameter in various industries such as pharmaceuticals, food and beverage, chemical processing, and more. Handheld density meters are compact, lightweight, and designed for on-the-go measurements in different environments. Here are some key features and applications of handheld portable density meters:

Key Features:

  1. Portability: As the name suggests, these meters are portable and can be easily carried around by hand. This makes them suitable for field measurements, quality control checks, and inspections at various locations.
  2. Ease of Use: Handheld density meters are designed to be user-friendly, with simple interfaces and easy-to-read displays. They often provide quick and accurate results without the need for extensive training.
  3. Durability: These devices are typically built to withstand various environmental conditions. They may have rugged exteriors to protect against potential impacts or exposure to liquids.
  4. Measurement Range: Handheld density meters come with a specific measurement range, which determines the minimum and maximum densities they can accurately measure. Users should select a meter that fits the density range of the substances they need to measure.
  5. Sample Handling: Some handheld density meters allow for direct immersion into the sample, while others may require a small volume of the sample to be transferred to a measurement cell.
  6. Display and Data Storage: Most devices come with a digital display that shows the density readings. Some models may also have data storage capabilities for recording and analyzing multiple measurements.
  7. Battery Power: Handheld meters are usually powered by batteries, providing the necessary flexibility for use in various locations without relying on a power source.


  1. Beverage Industry: Measuring the density of beverages is crucial for quality control in the production of alcoholic and non-alcoholic drinks.
  2. Pharmaceuticals: Density measurement is essential in pharmaceutical manufacturing to ensure the consistency of liquid formulations.
  3. Chemical Processing: Handheld density meters can be used to monitor the concentration of solutions and check for any deviations from specified values.
  4. Petroleum Industry: Density meters are employed in the oil and gas industry for measuring the density of crude oil, refined products, and drilling fluids.
  5. Quality Control: These meters are valuable tools for quality control in various industries, allowing quick checks on the density of materials.

When selecting a handheld portable density meter, it’s important to consider the specific requirements of the application and the properties of the substances being measured. Calibration and regular maintenance are also crucial for accurate and reliable density measurements over time.

Why Servo Tank Gauge is a Better Choice

A Servo Tank Gauge (STG) is often considered a better choice for tank level measurement and monitoring in various industries. Here are some reasons why:

  1. Accuracy: Servo Tank Gauges are known for their high level of accuracy in measuring liquid levels in tanks. They provide precise readings, making them reliable for applications where accuracy is critical.
  2. Continuous Monitoring: STGs offer continuous and real-time monitoring of tank levels. This continuous monitoring allows for immediate detection of any changes or anomalies, enabling quick responses to prevent issues such as overfilling or stockouts.
  3. Versatility: Servo Tank Gauges are versatile and can be used for a wide range of liquids, including hazardous materials. They can handle different types of tanks, such as fixed-roof tanks, floating-roof tanks, and underground tanks.
  4. Temperature Compensation: Many Servo Tank Gauges come with temperature compensation features. This means they can account for variations in temperature, providing accurate readings even when the temperature of the stored liquid changes.
  5. Remote Monitoring: With advancements in technology, many STGs offer remote monitoring capabilities. This allows operators to monitor tank levels and receive alerts or reports from a remote location, enhancing efficiency and reducing the need for on-site inspections.
  6. Reduced Maintenance: Servo Tank Gauges often require less maintenance compared to some alternative methods of tank level measurement. Their design minimizes the need for frequent calibration or manual adjustments.
  7. Long-Term Reliability: STGs are known for their long-term reliability. They are designed to withstand harsh environmental conditions and provide consistent performance over an extended period.
  8. Safety: Accurate tank level measurement is crucial for safety, especially when dealing with hazardous materials. Servo Tank Gauges contribute to safer operations by providing reliable information to prevent incidents such as spills or leaks.

The choice of tank level measurement technology depends on specific application requirements, industry standards, and the characteristics of the stored materials. While Servo Tank Gauges offer many advantages, the suitability of a particular gauge depends on factors such as the type of tank, the nature of the stored substance, and the operational environment.

Automatic Tank Gauging Systems for Release Detection

Automatic tank gauging systems play a crucial role in release detection for underground storage tanks (USTs) containing liquids such as petroleum products. These systems are designed to monitor and manage tank levels, temperature, and other relevant parameters, providing real-time data to detect potential releases and ensure regulatory compliance. Here are key aspects of how automatic tank gaugin systems contribute to release detection:

  1. Continuous Monitoring: Automatic tank gaugin systems continuously monitor the level of liquid in the tank. Sudden or unexpected changes in levels can indicate a potential issue, such as a leak.
  2. Leak Detection: Many automatic tank gauging systems are equipped with leak detection capabilities. They can identify leaks by analyzing variations in tank levels that are inconsistent with normal usage patterns. This is critical for early detection and response to minimize environmental impact.
  3. Inventory Reconciliation: Automatic tank gaugin systems perform inventory reconciliation by comparing the measured tank level with the expected level based on sales, deliveries, and other transactions. Significant discrepancies may suggest a leak or theft.
  4. Temperature Monitoring: Some automatic tank gaugin systems include temperature sensors. Anomalies in temperature readings can indicate changes in the stored liquid or the presence of a leak.
  5. Alarms and Notifications: Automatic tank gaugin systems generate alarms and notifications when abnormal conditions are detected. These alerts can be sent to facility operators or relevant authorities to prompt immediate investigation and action.
  6. Data Logging and Reporting: Automatic tank gaugin systems log data over time, providing a historical record of tank conditions. This data is valuable for regulatory compliance, trend analysis, and retrospective investigations.
  7. Integration with Other Systems: Automatic tank gaugin systems may integrate with other site monitoring and control systems. This integration enhances the overall site security and safety by providing a comprehensive view of various parameters.
  8. Remote Monitoring: Many automatic tank gaugin systems offer remote monitoring capabilities. This allows operators to access real-time data and receive alerts from anywhere, facilitating prompt response to issues even if personnel are not on-site.
  9. Compliance with Regulations: The use of automatic tank gaugin systems is often required by environmental regulations to ensure that UST operators meet specific monitoring and reporting requirements.

The automatic tank gauging systems are instrumental in release detection for underground storage tanks, offering continuous monitoring, leak detection, and other features to enhance environmental protection, safety, and regulatory compliance in the storage and handling of liquid products.

Level Instrumentation of Servo Tank Gauge

A Servo Tank GaugeĀ  is a device used for accurate level measurement in tanks. It typically employs a servo motor-driven measuring tape or wire that is lowered into the tank, and the level is determined based on the length of tape extended. Here’s a brief overview of the level instrumentation of a Servo Tank Gauge:

Servo Motor and Reel:

The heart of the Servo Tank Gauge is the servo motor and reel mechanism. The servo motor controls the movement of the measuring tape or wire.
Measuring Tape or Wire:

The measuring tape or wire is usually made of stainless steel or another corrosion-resistant material. It is attached to the servo motor’s reel and is lowered into the tank to measure the liquid level.
Sensor System:

The Servo Tank Gauge is equipped with a sensor system that monitors the position of the measuring tape or wire. This system provides feedback to the servo motor, allowing it to precisely control the tape’s movement.
Position Measurement:

The position of the measuring tape or wire is directly proportional to the liquid level in the tank. As the tape is lowered or raised, the sensor system continuously measures its position, providing real-time data on the level of the liquid.
Electronic Display/Control Unit:

The level information obtained by the sensor system is sent to an electronic display or control unit. This unit may be located at the tank site or connected to a central control room.

The Servo Tank Gauge requires calibration to ensure accurate level measurements. This calibration process involves correlating the position of the measuring tape or wire with the actual liquid level in the tank.
Communication Interfaces:

Many modern Servo Tank Gauges are equipped with communication interfaces, allowing them to integrate with control systems, distributed control systems (DCS), or supervisory control and data acquisition (SCADA) systems. This enables remote monitoring and control of tank levels.
Safety Features:

Servo Tank Gauges often include safety features, such as alarms for high or low-level conditions. These alerts help operators take corrective actions in case of abnormal tank levels.
Maintenance and Diagnostics:

Regular maintenance and diagnostic features are essential for ensuring the proper functioning of the Servo Tank Gauge. This may include self-diagnostic checks, automatic error detection, and preventive maintenance routines.
Servo Tank Gauges are widely used in industries such as oil and gas, petrochemicals, and water treatment, where accurate and reliable tank level measurements are critical for operational efficiency and safety.

Selecting the right technology for servo tank gauge

Selecting the right technology for a servo tank gauge is crucial to ensure accurate and reliable measurement of tank levels. The choice of technology depends on factors such as the type of liquid being measured, the tank environment, accuracy requirements, and budget considerations. Here are some common technologies used in servo tank gauges:

  1. Radar Level Measurement:
    • Principle: Uses radar waves to measure the distance from the antenna to the liquid surface.
    • Advantages: Suitable for a wide range of liquids, non-contact measurement, high accuracy, and works well in challenging environments.
    • Considerations: Higher initial cost, but often justifiable for applications where accuracy is critical.
  2. Ultrasonic Level Measurement:
    • Principle: Utilizes ultrasonic waves to measure the time taken for the signal to reflect off the liquid surface.
    • Advantages: Non-contact, suitable for various liquids, cost-effective, and works well for open and closed tanks.
    • Considerations: May be affected by environmental conditions such as temperature and humidity.
  3. Guided Wave Radar (GWR):
    • Principle: Similar to radar but guided along a probe extending into the liquid.
    • Advantages: Suitable for liquids with low dielectric constants, high accuracy, and works well in challenging conditions.
    • Considerations: Installation may be more complex than non-contact radar.
  4. Capacitance Level Measurement:
    • Principle: Measures changes in capacitance between the probe and the tank wall caused by variations in liquid level.
    • Advantages: Suitable for a wide range of liquids, relatively simple design, and cost-effective.
    • Considerations: May be affected by changes in liquid properties.
  5. Hydrostatic Pressure Measurement:
    • Principle: Measures the pressure at the bottom of the tank and correlates it with liquid level.
    • Advantages: Simple design, suitable for various liquids, and cost-effective.
    • Considerations: Requires accurate compensation for changes in temperature and atmospheric pressure.
  6. Magnetostrictive Level Measurement:
    • Principle: Measures the time it takes for a magnetic field pulse to travel along a wire immersed in the liquid.
    • Advantages: High accuracy, suitable for various liquids, and provides continuous level measurement.
    • Considerations: May have higher upfront costs.

When selecting the right technology for a servo tank gauge, it’s essential to consider factors like the characteristics of the liquid, required accuracy, environmental conditions, maintenance requirements, and budget constraints. Consulting with industry experts and conducting a thorough evaluation of the specific application can help in making an informed decision.

LNG tank gauging for the oil and gas industry

LNG (Liquefied Natural Gas) tank gauging is a crucial aspect of the oil and gas industry, especially for the storage and transportation of LNG. Accurate measurement and monitoring of LNG levels in storage tanks are essential for safety, operational efficiency, inventory management, and regulatory compliance. Several methods are commonly used for LNG tank gauging:

  1. Radar Gauging: Radar level measurement is one of the primary methods used for LNG tank gauging. It employs radar waves to determine the level of the LNG within the tank. This method provides continuous, accurate measurements regardless of environmental conditions or the characteristics of the LNG.
  2. Ultrasonic Gauging: Ultrasonic level measurement is another technology utilized for LNG tank gauging. It involves emitting ultrasonic waves into the tank and measuring the time taken for the waves to reflect back. This data is then used to determine the LNG level.
  3. Pressure Gauges: Differential pressure transmitters can be used to calculate LNG levels by measuring the pressure difference between the top and bottom of the tank. This method requires accurate density measurements and is influenced by temperature changes.
  4. Temperature Monitoring: LNG’s volume is affected by temperature variations. Temperature sensors placed within the tank can help account for these changes and adjust volume calculations accordingly.
  5. Hydrostatic Tank Gauging: This method involves measuring the hydrostatic pressure at the base of the tank and using it to determine the liquid level. It’s accurate but requires careful calibration.

In addition to these methods, some systems may combine various technologies to ensure redundancy and accuracy in measurements. For instance, a combination of radar and temperature monitoring might be employed for a more comprehensive understanding of LNG levels and properties within the tank.

Accurate tank gauging is essential to prevent overfilling, ensure safe operations, and optimize storage capacity. Additionally, these measurements help in the efficient planning of LNG transportation and distribution, ensuring that adequate quantities are available when needed while minimizing waste or shortages. Regulatory bodies often have strict guidelines regarding tank gauging to ensure safety and environmental compliance in LNG operations.

Specific Portable Density Meter

Portable density meters are crucial devices used across various industries including food and beverage, pharmaceuticals, chemicals, and more. They allow for the quick and precise measurement of density, specific gravity, concentration, or other related parameters of liquids on-site.

Several specific portable density meters available in the market include:

  1. Anton Paar DMA 35: This is a portable density meter that’s known for its accuracy and ease of use. It’s often used in industries such as beverage manufacturing, petroleum, and chemical processing. The device is compact, robust, and can measure density, specific gravity, and other related parameters.
  2. Mettler Toledo DMA 4500M: This portable density meter is designed for various applications in the food and beverage, pharmaceutical, and chemical industries. It’s known for its accuracy and ability to measure density and concentration of liquids with ease.
  3. KEM DA-130N: KEM offers a range of portable density meters, and the DA-130N is one such device. It’s suitable for various liquids and industries including food, chemicals, and research labs. It provides accurate measurements of density and specific gravity.
  4. Knick Portavo: Knick’s Portavo series consists of portable meters that measure various parameters including density, concentration, pH, and more. They are versatile and designed for use in demanding industrial environments.

When choosing a specific portable density meter, factors to consider include accuracy, measurement range, ease of use, durability, compatibility with different types of liquids, and any specific requirements of your industry or application.

It’s advisable to review the specifications, user reviews, and consult with industry experts to determine which portable density meter best suits your needs before making a purchase.