【2025 Instrumentation Measurement】Application of External Ultrasonic Level Gauges in Upgrading Tank Level Measurement

This post was last edited by zhoudingshengs on 2025-6-17 at 14:27. The following replies are not part of the text in the attachment and are provided for reference only: Specifications for setting liquid level gauges in storage tanks: AQ 3059-2023 “Safety Management Specifications for Liquefied Hydrocarbon Storage Areas in Chemical Enterprises”. 6.6.2 For newly built pressure-type storage tanks for liquefied hydrocarbons, liquid level measuring instruments should be installed in one of the following two ways: 1. Two sets of continuous liquid level measuring instruments and one high-high liquid level switch; or 2. Three sets of continuous liquid level measuring instruments. Pressure-type storage tanks for liquefied hydrocarbons shall be equipped with alarms for high liquid level, low liquid level, high-high liquid level, and low-low liquid level. The high-high liquid level alarm should trigger the interlocking shutdown of the emergency shut-off valve for tank feeding.

AQ 3053-2015 \"Safety Technical Regulations for Vertical Cylindrical Welded Steel Storage Tanks\" 12.2.2 Level control: For storage tanks holding flammable liquids, level gauges as well as high and low level alarm devices, and high-high level alarm devices must be installed in accordance with the requirements of the standards and operational needs; the alarm signals and level information must be transmitted to the control room.

For tanks that are operated frequently, it is advisable to install automatic interlock emergency shut-off devices. Large tanks should be equipped with low and high liquid level alarm devices, high-high liquid level alarm devices, and emergency shut-off devices, and interlocking measures should be implemented between the high-high liquid level alarm and the emergency shut-off device. Emergency shutoff valve interlock buttons should be installed outside the fire dike and at the control room operation station. When a high level alarm or a fire occurs in the storage tank, it is possible to remotely or manually close the feed cut-off valve; once the cut-off valve is closed, an automatic interlock stops the feed pump.

GB 50341-2014 \"Code for Design of Vertical Cylindrical Welded Steel Oil Tanks\" does not specify the number of level gauges regarding the design of the liquid level height.

AQ 3036-2010 \"Code for the Installation of On-site Safety Monitoring Equipment in Tank Areas for Major Hazardous Sources of Hazardous Chemicals\" 4.3.2 At least one level of alarm should be set for both high and low liquid levels; the alarm thresholds are respectively the high-level limit and the low-level limit. 6.3.1 The storage tank shall be equipped with a level monitor that provides alarms for high and low liquid levels.

SH/T 3007-2014 \"Code for Design of Tank Areas in Petrochemical Storage and Transportation Systems\" 5.4.1 Storage tanks with a capacity greater than 100 m³ shall be equipped with remote liquid level measurement instruments. 5.4.5 The level measurement instruments for the high and low level alarm signals of the storage tank shall be separate continuous level meters or level switches, and the alarm signals shall be transmitted to the automatic control system. Configuration: 2 sets of level gauges + (high-high alarm and low-low alarm set independently)

SH 3136-2003 \"Code for Design of Spherical Storage Tanks for Liquefied Hydrocarbons in Petrochemical Industries\" 5.3.1 Spherical storage tanks for liquefied hydrocarbons shall be equipped with local and remote level gauges; however, glass plate level gauges should not be used. The level gauge used should be safe and reliable, and the number of openings in the spherical storage tanks for liquefied hydrocarbons should be minimized as much as possible. Configuration: 2 sets of level gauges (local + remote transmission)

SH/T 3136-2024 \"Code for Safe Design of Spherical Storage Tanks for Liquefied Hydrocarbons\" (Draft for Approval) 5.3.1 Spherical storage tanks for liquefied hydrocarbons shall be equipped with at least two sets of remote continuous level gauges; it is advisable to use level gauges based on different measurement principles, and at least one of these sets shall have the function of providing an on-site level indication. Configuration: 2 sets of remote level gauges + local level indication function

GB 50160-2008 \"Code for Fire Protection Design of Petrochemical Enterprises (2018 Edition)\", 6.2.23: Storage tanks for flammable liquids shall be equipped with level gauges and high-level alarms; where necessary, automatic interlock systems to shut off the feeding facilities shall also be installed； An automatic dehydrator should also be installed. 6.3.10 Liquid ammonia storage tanks shall be equipped with level gauges, pressure gauges, and safety valves ； Low-temperature liquid ammonia storage tanks should also be equipped with temperature indicators. 6.3.11 Liquefied hydrocarbon storage tanks shall be equipped with level gauges, thermometers, pressure gauges, safety valves, as well as high-level alarms and automatic interlock shutdown mechanisms for extremely high levels to cut off feed. Configuration: Level gauge + high-level alarm + interlocked shutdown device