What level gauge should be selected to measure the level of liquid ammonia storage tank, and what co

Ultrasonic level gauges can be used, and externally mounted can meet the conditions of use.

For liquid ammonia storage tanks, the first choice is to post an external ultrasonic level gauge, Dinghua has been doing this for some years, measuring from outside the tank, non-contact measurement, no need to start a fire.

Due to the danger of the medium, the core of safety control is the reasonable selection of instruments, real-time monitoring and early warning, correct process and accident prevention plan. In view of the possibility of poisoning, fire and even poisoning caused by the storage and leakage of liquid ammonia, Xi'an Dinghua Electronics believes that the leakage of liquid ammonia and how to deal with it after leakage should be prevented from the following aspects.

Choosing the right monitoring instrument for liquid ammonia storage is the premise of ensuring safe production. The main instruments of the liquid ammonia tank farm include liquid level, temperature, pressure, toxic (flammable) gas alarm, etc. For tank farms with system retrofits, environments with difficult wiring, wireless instrumentation solutions can be used.

Liquid ammonia is a highly dangerous chemical substance, the accuracy and ease of use of the level gauge is the main safety accessory to ensure the safe operation of the storage tank, most of the liquid ammonia storage tank design level gauge is float type, the advantage of the level gauge is accurate indication, small error, the disadvantage is that it is easy to stuck, resulting in the failure of the level gauge. And it does not have the function of remote transmission. In order to be safe, the liquid ammonia tank adopts the principle of minimizing the opening to ensure the best overall strength of the tank.

In order to ensure that the liquid level can be safely monitored and do not open the original liquid ammonia storage tank, therefore, for the monitoring of the liquid level of this part of the tank farm, it is recommended that the user choose the ELL external level gauge invented by Dinghua Electronics. The liquid level gauge is different from the ordinary liquid level gauge, there is no need to open a hole in the tank, and the magnetic probe is attached to the outside of the metal tank wall, and the real-time liquid level of the tank can be monitored through the principle of vibration analysis, which is safe and reliable, and will never contact the medium.

Due to the characteristics of liquid ammonia, it is recommended that the storage of liquid ammonia should not exceed 85% of the capacity, the liquid level gauge is used as the liquid level measurement of the tank, real-time monitoring of the change of liquid level, according to the on-site process to set the upper and lower limit of the alarm point, when the liquid level reaches or exceeds the alarm limit, immediately notify the operator to deal with it in time to avoid potential dangers.

For some liquid ammonia tank measurement on the real-time value of the liquid level value demand is not strong, only need the liquid level high alarm customers, can be the same principle as the external liquid level gauge external level measurement switch, the same external measurement, no need to open the hole, real-time monitoring of the tank liquid level and the set point, once reached or exceeded, immediately output the switch signal 1 to the controller or alarm, so that the staff can do the corresponding prevention work.

Select explosion-proof and anti-corrosion pressure and temperature instruments to detect and record the status of liquid ammonia in real time. The temperature and pressure of the original storage tank can be transformed into a pressure and temperature transmitter with remote transmission function and local display. For some users who do not have extra holes in the tank, it is recommended that users can use Dinghua's external temperature sensor to measure the temperature of the tank wall close to the tank wall to achieve the effect of understanding the temperature of the medium in the tank.

There is a possibility of failure or leakage in the gas phase inlet and outlet, liquid phase inlet and outlet, sewage outlet, discharge port, instrument interface, safety valve interface, pressure gauge interface and other pipes, valves, flange connection seals and other parts of the liquid ammonia storage tank. Toxic (flammable) gas probes are reasonably distributed in the leak-prone areas of the tank farm, and record the concentration of toxic (flammable) gases in the air around the tank farm. As soon as the standard is exceeded, this signal is immediately sent to the alarm.

External level gaugeIt is the best choice for measuring liquid ammonia.

1. Liquid ammonia is widely used in industry, corrosive and volatile, so its chemical accident rate is very high.

2. The external liquid level gauge does not use valves, communication pipes, joints, no holes, does not contact the liquid and gas in the tank, and realizes the operation through the external sonar sensor (probe) to ensure the safety of personnel and the normal progress of production, so the liquid ammonia filling area is very suitable for the installation of external level gauge (external liquid level gauge is also known as external level gauge or external level gauge).

3. Liquid ammonia is a medium with a large density change affected by temperature, when the liquid ammonia in the storage tank is less than half, the calibration probe on the side will not be able to calibrate correctly, which will affect the accuracy of the measurement results. In this case, the external level gauge can automatically enable temperature calibration or pipe calibration to ensure a high degree of accuracy in the measurement results.

4. The method of temperature calibration and pipeline calibration has great advantages in liquid ammonia horizontal tank. Affected by temperature, the most common media with large density changes are propylene, liquefied gas, etc.

<> working principle of external level gauge.

Liquid ammonia level gauge case.

Usually the level gauge used in chemical storage tanks is a radar level gauge.

There are many types of radar level gauges, and the influence of the temperature, pressure, density, viscosity and corrosiveness of the measured medium on its performance should be considered firstly when selecting the model. Therefore, it is necessary to select the appropriate antenna and meter head according to the characteristics of the medium under specific working conditions. For small tanks with complex shapes or applications that require the measurement of multiple liquid interfaces, it is recommended to use a guided cable antenna radar level gauge; For the tank with complex measurement environment, such as volatile medium, corrosion, high pressure and high temperature, etc., it is recommended to use non-contact antenna radar level gauge, because the level gauge is not in contact with the medium, it can avoid the damage to the level gauge itself due to the physical and chemical properties of the medium.

A hydrochloric acid storage tank is a common chemical storage tank used to store strong acids such as hydrochloric acid. The installation of a level gauge on the hydrochloric acid storage tank can monitor the liquid level in the tank in real time to ensure the safe operation of the tank. However, due to the highly corrosive nature of hydrochloric acid, the corrosion resistance of the material needs to be considered when selecting a level meter.

Generally speaking, the materials selected for the level gauge used on the hydrochloric acid storage tank should have the following characteristics:

1.Good corrosion resistance: hydrochloric acid is a strong acid that is easy to corrode metal materials. Therefore, the material of the level gauge should have good corrosion resistance and be able to work stably in the hydrochloric acid environment for a long time.

2.Good high temperature resistance: hydrochloric acid is prone to decomposition reaction at high temperatures, producing toxic gases. Therefore, the material of the level gauge should have good high temperature resistance and be able to work stably in a high temperature environment.

3.High accuracy: The accuracy of the celery age meter should be high, which can accurately measure the liquid level in the storage tank and avoid safety accidents caused by the liquid level being too high or too low.

4.Easy maintenance: The level gauge should be easy to maintain, able to be quickly replaced or repaired, and avoid production accidents caused by the failure of the level gauge.

Common level gauge materials used on hydrochloric acid storage tanks include: polytetrafluoroethylene (PTFE), polypropylene (PP), polyvinyl chloride (PVC), etc. These materials have good corrosion resistance and high temperature resistance, and can meet the requirements of the level gauge on the hydrochloric acid storage tank.

The level gauge with steel lining plastic is clearly coded, that is, the valve mold pants are steel-lined plastic, the glass tube is glass, or the material of polypropylene is used, and the glass pipe can be made of transparent PVC or F4 pipe.

Don't, it's better not to use stainless steel. If you have to have a magnetic flap, the material can be made of fiberglass, which is now available on the market.

Stainless steel is generally not very acid-resistant, hydrochloric acid seems to be OK, but it also depends on the concentration of hydrochloric acid, you can search on the forum for the use of stainless steel precautions. It should be good to use glass tubes, and the sealed ones should be lined with PTFE (tetrafluoroethylene). However, it also depends on the operating temperature, the maximum temperature of PTFE seems to be 180 degrees Celsius.

It is best to use a steel-lined PTFE magnetic flap level gauge without fear of damage to the level gauge.

Commonly used level gauges for liquid ammonia storage tanks: cable guided wave radar level gauge, magnetic flap level gauge.

1. Cable-guided wave radar level gauge

Take the LevelFlexFMP51, for example, a level gauge that is a "top-down" measuring system based on the TOF (travel time) principle. The distance between the reference point and the liquid ammonia surface is measured. High-frequency pulses are emitted to the probe and propagated along the probe.

The pulse signal is reflected on the surface of the liquid ammonia, and the reflected signal is received by the instrument and converted into level information. This measurement method is known as TDR (Time Domain Reflectometry), in which the distance (D) from the measurement reference point to the surface of the liquid ammonia is proportional to the running time (T) of the pulse signal: D = C*T 2, where C is the speed of light.

2. Magnetic flap level gauge

Taking the UHZ side-mounted magnetic flap level gauge as an example, the design is based on the magnetic principle and the float law. When the liquid level in the measured container rises and falls, the two-color cylindrical magnetic float in the cavity of the magnetic level gauge rises and falls through the influence of the magnetic field. At this time, the junction of the two-color cylindrical float on the level gauge panel is the actual liquid level measured by the cable guided wave radar level gauge in the liquid ammonia storage tank.

Liquid ammonia spherical tank level gauge installation requirements

1. No magnetic conductive substances are allowed to approach around the liquid ammonia spherical tank level gauge, and iron wire fixation is prohibited, otherwise it will affect the normal operation of the liquid ammonia spherical tank level gauge.

2. If the user uses the heat trace pipeline by himself, he must choose non-magnetic materials, such as copper pipes. The heat tracing temperature is determined according to the condition of the medium.

3. The liquid ammonia spherical tank level gauge must be installed vertically, and a ball valve should be installed between the liquid ammonia spherical tank level gauge and the container lead pipe to facilitate maintenance and cleaning.

4. The medium should not contain solid impurities or magnetic substances, so as not to cause jamming to the float.

5. Before use, the small balls below the zero position should be placed red with a correction magnet, and the other balls should be placed white.

6. During debugging, the upper pilot valve should be opened first, and then the lower valve should be opened slowly, so that the medium can enter the main pipe smoothly, observe whether the magnetic red and white ball is normal, and then close the lower pilot valve, open the sewage valve, and let the liquid level in the main pipe drop.

7. According to the condition of the medium, the main pipe should be cleaned from time to time to remove impurities.

The above content reference: Encyclopedia - Radar Level Gauge.

Hello dear<>

I am asking a question and answer the main Yiyi Lu Shou Zhong quarrel, the liquid ammonia storage tank uses an ultrasonic level gauge, which is externally pasted, which can meet the conditions of use. <>

Because the ultrasonic level gauge is not in direct contact with the liquid, it can be used in the cultivation materials and liquids with certain toxicity, flammability, high viscosity and corrosiveness. Ultrasonic level gauge also has the advantages of light weight, long life, stability and durability, easy installation, etc., and has been widely used in sewage treatment, chemical production and other fields. In order to make the ultrasonic level gauge play a better role in the actual working conditions.

The storage tank of liquid ammonia socks should be equipped with a level gauge, and the storage tank of low-temperature liquid ammonia should also be equipped with a temperature indicator.

Pressure gauges and breathing valves.

Thermometer and breathing valve.

Pressure gauge and safety valve (correct answer).

Thermometer and accompaniment safety valve Lu Hao Li.

Answer analysis: The storage tank of liquid ammonia in the code for fire protection design of petrochemical enterprises (GB50160-2008) should be equipped with a level gauge, pressure gauge and safety valve; The cryogenic liquid ammonia storage tank should also be equipped with a temperature indicator.

Summary. However, it should be noted that when measuring the level of the negative pressure tank, it is necessary to select the appropriate float level gauge model according to the specific process requirements to ensure the accuracy and reliability of the measurement.

Which level gauge should be used for level measurement at room temperature and negative pressure tank? Is it OK to have a pontoon level gauge? Level range.

Float level gauge can generally be used for level measurement in the negative pressure tank at room temperature. Since the negative pressure tank is operated at room temperature, the use of the float level gauge is not affected by temperature. The principle of the float level gauge is to change the position of the float through the change of the liquid level, so as to realize the measurement of the liquid level.

The float level gauge has the advantages of simple structure, easy to use, low maintenance cost, etc., and is widely used in various liquid level measurement occasions.

Can you elaborate on that a little bit more?

However, it is necessary to pay attention to the fact that when measuring the leakage level of the negative pressure tank, it is necessary to select the appropriate float level gauge model according to the specific process requirements to ensure the accuracy and reliability of the measurement.