How are LNG tank detectors arranged and installed to ensure the sealing performance of the interface

1、 How to deploy low-temperature storage tank detectors? The installation location of LNG storage tank detectors should be determined based on the velocity and direction of air flow, the relative position of potential leakage sources, and ventilation conditions, and should be easy to maintain and calibrate. Detectors and alarm controllers should be installed in a way that is less susceptible to vibration. If electromagnetic interference is likely to occur nearby, armored cables or cables with metal protective tubes should be used. The installation height of gas detectors should be determined according to the density. When the gas density is greater than 0.97kg/m3 (under standard conditions), the installation height should be 0.3-0.6m above the ground; when the gas density is less than or equal to 0.97kg/m3 (under standard conditions), the installation height should be 0.5-1.0m above the premium product. When arranging and setting the number of detectors, the following steps should be followed: (1) First, it is necessary to identify the low-temperature storage tanks to be monitored, identify potential leakage situations, calculate their leakage pressure, possible leakage volume per unit time, and leakage direction, draw a grid distribution diagram, and classify them into A, B, and C3 levels based on the estimated severity. (2) Based on the dominant wind direction of the location, possible air circulation phenomena, and the upward trend of air flow, as well as the habitual channels of natural air flow, it is inferred that when a large amount of leakage occurs, the natural diffusion trend of combustible gas on the plane will follow a directional diagram. (3) Based on the density of the leaked gas (greater or less than air) and the upward trend of air flow, a three-dimensional flow trend chart of the leaked flow is synthesized. (4) According to the three-dimensional flow concept of combustible gas leakage within the monitoring range, an initial point setting plan can be made at the downstream position of its flow. (5) Study whether the point leakage state of the leakage point may be a micro leak or a jet like leak. If it is a micro leak, the location of the set point should be close to the leak point. If it is a jet leak, it should be slightly away from the leak point. Based on these situations, formulate a final plan for setting up the site. In this way, the number and variety of detectors that need to be purchased can be estimated from the final grid diagram considered. (6) For a large or medium-sized low-temperature storage tank area with the possibility of leakage, it is recommended to set up one detection point every 10-20m. (7) For the detection of gases with a density greater than air, the detector should be installed on a plane below the leakage point, and attention should be paid to the surrounding environmental characteristics. For example, places where underground trenches are prone to accumulation, underground cable trenches leading to control rooms on site, and sewage trenches with sealed covers are all places where combustible gases are prone to accumulate frequently or in abnormal production situations. 2. The structural design of the monitoring system for the low-temperature storage tank (low-temperature storage tank) area of petrochemical liquefied natural growth gas fire monitoring and extinguishing linkage control system takes into account the different requirements of DC4-20mA transmission of process monitoring parameters and fire parameter transmission, as well as the signal output requirements for linkage control of fire extinguishing equipment. The monitoring of process parameters is based on data communication conversion protocols, designing and constructing explosion-proof (mainly based on actual reports) DDZ converters, which receive and process 4-20mA intrinsic safety primary instrument output signals, such as concentration, composition, LNG container temperature, liquid level, pressure and other process parameter detectors' output signals. The monitoring host mainly completes the continuous collection and processing of Anran parameters and early fire parameters. Modern signal detection and processing methods are used to analyze the collected signals, predict and take measures to deal with accidents in a timely manner. The on-site fire-fighting equipment is activated through DC hard wire connection and remote linkage control device to carry out fire extinguishing operations. 3. The monitoring system software implementation system application software adopts modular programming, mainly including system main control module, accident handling module, information communication module, fire management module and other functional modules. The functions of each module are as follows: (1) System main control module. Mainly responsible for data collection and processing, alarm judgment and linkage control output, automatic and manual control mode switching, and system management. (2) Accident handling module. Based on monitoring data, analyze and predict the accident status of the monitoring area, control the operation of the process safely and handle emergency situations, and implement disaster relief plans. (3) Information communication module. Mainly responsible for communication protocol management, data communication control, and remote networking across different locations. (4) Fire management module. Mainly responsible for system operation management, equipment condition management, fire prevention (mainly based on actual reports) management, and data storage. 2、 The sealing performance of the interface during the installation of liquefied gas storage tanks. Liquefied natural growth gas storage tanks, as the name suggests, are often used to store chemical products, so safety is important. Safety comes from every detail. When installing liquefied gas storage tanks, we need to pay strict attention to the following matters: 1. The foundation for installing liquefied gas storage tanks should be horizontal and able to withstand corresponding pressure. If steel structures are used, the gap should not be too large, and wooden or iron boards should be laid on top. 2. When storing chemicals in liquefied gas storage tanks, there should be good drainage ditches and dilution devices around the site. 3. Due to the inevitable protrusion of the bottom into the tank during the formation of liquefied gas storage tanks, the foundation should be made into a spherical crown shape similar to the bottom. On a horizontal basis, there is no need to lay sand to form a spherical crown corresponding to the bottom of the liquefied gas storage tank. When used outdoors, it should be appropriately avoided from direct sunlight to extend its service life. 4. When installing large-sized liquefied gas storage tanks, attention should be paid to safety, and cranes should be used as much as possible. If the method is unknown. 5. After the installation of the liquefied gas storage tank, the sealing performance of the interface should be checked before use. If the liquid is added beyond the interface, observe whether there is any leakage. Liquefied gas storage tanks containing chemical liquids should be leak tested with water to prevent significant losses. 6. The pipes connected to the lower joint or flange of the liquefied gas storage tank should be perpendicular to the barrel wall and use soft connections to prevent uneven expansion of the barrel wall after filling with liquid, which may damage the joint connection and cause leakage, and in severe cases, damage the joint and barrel body. 7. When the inlet is higher from the bottom of the tank, it should be bent towards the tank wall to allow the incoming liquid to fall down along the tank wall and reduce the impact on the bottom. 8. The liquefied gas storage tank has been equipped with an integral one-time forming reinforcement ring. If necessary, a metal reinforcement sleeve can be used to limit the expansion and deformation of the tank body, thereby avoiding bottom expansion. 9. When installing heavy auxiliary equipment such as mixers on barrels, or when people need to work on the top of the tank and the top cannot bear their weight, please make a separate rack or ladder and pay attention to the safety of the operation. 10. When the liquid level cannot be controlled, an overflow port should be installed to prevent liquid from overflowing from the manhole and causing unnecessary injury. 11. When the inlet and outlet flow rates are high, corresponding exhaust pipes should be installed.