How many sets of liquid level gauges should be installed in liquefied hydrocarbon storage tanks? What does the specification say? ?
Thread Content
"Safety Design Code for Liquefied Hydrocarbon Spherical Storage Tanks" SH/T3136-20255.3.1 Liquefied hydrocarbon spherical storage tanks should be equipped with at least two sets of remote continuous measurement level gauges. Level gauges with different measurement principles should be used, and at least one set of them should have a local liquid level indication function. "Technical Specifications for Safety Monitoring of Major Hazardous Sources of Hazardous Chemicals" GB17681-20 246.3.3.1 Pressure storage tanks should be equipped with at least 2 sets of continuous liquid level detection instruments and 1 high-high liquid level switch, or 3 sets of continuous liquid level detection instruments. "Safety Management Specifications for Liquefied Hydrocarbon Storage Tank Areas in Chemical Enterprises" AQ 3059-2023 6.6 Automatic Control 6.6.2 The liquid level instruments of the new liquefied hydrocarbon pressure storage tanks should be set up with 2 sets of continuous measuring liquid level instruments and 1 high and high liquid level switch, or 3 sets of continuous measuring liquid level instruments. Liquefied hydrocarbon pressure storage tanks should be equipped with high liquid level alarms, low liquid level alarms, high and high liquid level alarms and low and low liquid level alarms. The high and high liquid level alarms should be interlocked to close the tank feed emergency shut-off valve. "General Technical Specifications for Safety Monitoring of Major Hazardous Sources of Hazardous Chemicals" AQ 3036-20106.3 Setting up of liquid level monitoring equipment 6.3.1 Storage tanks should be equipped with liquid level monitors, which should have high and low liquid level alarm functions. 6.3.2 New storage tank areas should give priority to non-contact liquid level gauges such as radar and magnetostrictive and optical fiber level gauges. 6.3.7 Large (5000m³ and above) flammable liquid storage tanks and hazardous chemical pressure storage tanks above 400m³ should be equipped with high and high liquid level monitoring alarm and interlocking control systems. "Petrochemical Storage and Transportation System Tank Farm Design Specification" SH/T 3007-20146 Pressure Storage Tank Farm 6.3.2 A set of remote transmission instruments and a set of local indicating instruments should be installed for pressure storage tank liquid level measurement. The local indicating instruments should not use glass plate liquid level gauges. 6.3.3 The remote transmission instrument for liquid level measurement should be equipped with high and low liquid level alarms. The setting height of the high liquid level alarm should be the designed storage high liquid level of the storage tank. ； The setting height of the low liquid level alarm should meet the requirement that the pump will not cavitate within 10 to 15 minutes from the start of the alarm. 6.3.4 The pressure storage tank should be equipped with a separate set of liquid level measuring instruments or liquid level switches dedicated to high liquid level alarm and interlocking to cut off the valve of the tank feed pipe. The setting height of the high liquid level alarm should not be greater than the height when the liquid volume reaches 90% of the calculated volume of the storage tank. "Petrochemical Tank Farm Automation System Design Specifications" SH/T3184-2017 4.2.3.1 Two sets of continuous liquid level measuring instruments equipped with tank side indicators should be installed on the top of the tank, one of which is used to set high and low liquid level alarms in the control system. 4.2.3.2 A control scheme for high liquid level alarm and interlocking to close the switch valve of the storage tank feed pipe should be set up in the control system according to the process requirements. The signal adopts another set of liquid level continuous measuring instruments mentioned above. ； When a third set of liquid level instruments is required, a continuous measuring instrument should be used, or a liquid level switch can be used.
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