Valves with interlock to the oil tank level
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What kind of valves are generally used for the inlet and outlet tank valves with level interlocks, as well as the emergency shut-off valves in oil depot SIS systems?
In accordance with the \"SH/T 3005-2015 Specifications for the Selection and Design of Automation Instruments in the Petrochemical Industry\", gate valves, butterfly valves, and ball valves are generally used as emergency shut-off valves； There are also considerations regarding shutdown time, air storage tanks, etc.
Emergency shut-off valves have specific regulatory requirements.
https://bbs.hcbbs.com/thread-1853669-1-1.html Explosion-proof emergency shut-off valves for oil depots, as well as those used in storage and transportation; an overview of oil depot emergency shut-off valves. The NDFB41 series of emergency shut-off valves (hereinafter referred to as shut-off valves) are a new type of such valve developed by our company. They serve as reliable and essential safety devices to prevent accidents such as oil leaks in oil depots, oil spills from tanks, fires, and explosions. It plays a particularly important role in ensuring the safety of property and personnel. It works in conjunction with safety devices such as level gauges and combustible gas alarm lights; in the event of an accident at an oil depot or chemical plant, the shut-off valve will close quickly thanks to the alarm signals or an emergency power cut, thereby stopping the flow of oil or chemical liquids and preventing the accident from worsening. II: Application scope and uses of the storage and transportation explosion-proof emergency shut-off valve. This product is suitable for the inlet and outlet pipelines of oil tanks in oil depots and chemical plants; in the event of spills or leaks of oil or chemical liquids, as well as in case of fires, this valve can be used to shut off immediately, thereby stopping the flow of such oils or hazardous chemicals. Reduce the occurrence of explosion and fire accidents caused by leaks, and ensure the safety of lives and property of ** and the people. III: Main technical parameters of the explosion-proof emergency shut-off valve for storage and transportation
Product model: NDFB41-16
Nominal diameter: DN100, DN150, DN200, DN250, DN300
Structural type: Piston-type
Applicable media: Oil, chemicals, water, liquefied gas
Explosion protection rating: ExdIIBT4 GB
Protection rating: IP65
Operating pressure: 0.01–1.6 Mpa
Operating voltage: AC220V±10% and DC24V±10%
Minimum pressure difference: 0.01 Mpa
Valve body material: Cast steel (stainless steel valve bodies can be customized upon customer request)
Electrical interface: G1/2
Flange standard and grade: GB/T9119-2010, JB/T79, PN16
IV: Operating environment conditions for the explosion-proof emergency shut-off valve for storage and transportation
1. This shut-off valve is suitable for use in areas with explosive mixtures of Category II, Group B, with a surface temperature not exceeding Group T4, such as gasoline, kerosene, diesel, aviation fuel, lubricants with a viscosity not higher than that of engine oil, and various chemical liquids. 2. The power supply voltage fluctuation shall not exceed ±10% of the rated voltage. 3. A filtering device must be installed on the inlet pipeline. 4. The ambient temperature range is from -40°C to +55°C. 5. The ambient humidity shall not exceed 90%. V: Structural features of the explosion-proof emergency shut-off valve for oil tanks. Structure type: Piston-type. VI: Installation requirements and suggestions for the explosion-proof emergency shut-off valve used in storage and transportation. Open the packaging box and first check whether the packing list matches the actual products, whether they correspond to the ordered model, specifications, and parameters, and whether there is a product qualification certificate. Check whether the product is damaged or incomplete during shipping; if there are any issues, please contact the company directly. Please follow the installation diagram; the cut-off valve installed on the oil outlet pipeline should be 800 mm below the pipeline itself, to prevent difficulties in draining the oil from the tank. To facilitate disassembly for inspection, please install a bypass pipe. The cut-off valve should be installed horizontally, with the arrow on the valve body aligned in the same direction as the flow of the medium. The connection type of the cut-off valve is flange connection; the specific dimensions can be found in the flange dimension chart. The flange standard is GB/T9119-2010, and all bolts between the flanges are tightened securely. After the shut-off valve is firmly connected to the pipeline, it is connected to the electrical control device via the electrical interface G1/2 in the explosion-proof junction box, using 6-core 6*1mm2 (or 3-core 3*1mm2) plastic-sheathed insulated cables with good oil resistance (RVV type). The power supply and electrical control devices are located in non-explosive hazardous areas. Wiring: Refer to the electrical schematic for wiring details. 7: Working principle of the explosion-proof emergency shut-off valve in oil depots. The shut-off valve is of the normally closed type and is installed above the inlet pipe of the oil tank as well as below the outlet valve. When the oil flows normally, automatic or manual control can be employed. When automatic control is used, it can be interconnected with various safety devices such as the oil pump motor controller, level gauge controller, and combustible gas alarm. In the event of a high level alarm, a combustible gas alarm, or some other safety incident, the shut-off valve will use the relevant alarm signals to immediately cut off the supply of oil or the hazardous chemical liquid, with the emergency shut-off valve closing rapidly. This prevents the possibility of the accident escalating further; this valve is a safety valve and should not be used as a service valve. Manual control is used for temporary emergency situations, such as during debugging. The manual valve should be closed after debugging is completed! It should not be used under normal circumstances to avoid loss of control.
Product model: NDFB41-16
Nominal diameter: DN100, DN150, DN200, DN250, DN300
Structural type: Piston-type
Applicable media: Oil, chemicals, water, liquefied gas
Explosion protection rating: ExdIIBT4 GB
Protection rating: IP65
Operating pressure: 0.01–1.6 Mpa
Operating voltage: AC220V±10% and DC24V±10%
Minimum pressure difference: 0.01 Mpa
Valve body material: Cast steel (stainless steel valve bodies can be customized upon customer request)
Electrical interface: G1/2
Flange standard and grade: GB/T9119-2010, JB/T79, PN16
IV: Operating environment conditions for the explosion-proof emergency shut-off valve for storage and transportation
1. This shut-off valve is suitable for use in areas with explosive mixtures of Category II, Group B, with a surface temperature not exceeding Group T4, such as gasoline, kerosene, diesel, aviation fuel, lubricants with a viscosity not higher than that of engine oil, and various chemical liquids. 2. The power supply voltage fluctuation shall not exceed ±10% of the rated voltage. 3. A filtering device must be installed on the inlet pipeline. 4. The ambient temperature range is from -40°C to +55°C. 5. The ambient humidity shall not exceed 90%. V: Structural features of the explosion-proof emergency shut-off valve for oil tanks. Structure type: Piston-type. VI: Installation requirements and suggestions for the explosion-proof emergency shut-off valve used in storage and transportation. Open the packaging box and first check whether the packing list matches the actual products, whether they correspond to the ordered model, specifications, and parameters, and whether there is a product qualification certificate. Check whether the product is damaged or incomplete during shipping; if there are any issues, please contact the company directly. Please follow the installation diagram; the cut-off valve installed on the oil outlet pipeline should be 800 mm below the pipeline itself, to prevent difficulties in draining the oil from the tank. To facilitate disassembly for inspection, please install a bypass pipe. The cut-off valve should be installed horizontally, with the arrow on the valve body aligned in the same direction as the flow of the medium. The connection type of the cut-off valve is flange connection; the specific dimensions can be found in the flange dimension chart. The flange standard is GB/T9119-2010, and all bolts between the flanges are tightened securely. After the shut-off valve is firmly connected to the pipeline, it is connected to the electrical control device via the electrical interface G1/2 in the explosion-proof junction box, using 6-core 6*1mm2 (or 3-core 3*1mm2) plastic-sheathed insulated cables with good oil resistance (RVV type). The power supply and electrical control devices are located in non-explosive hazardous areas. Wiring: Refer to the electrical schematic for wiring details. 7: Working principle of the explosion-proof emergency shut-off valve in oil depots. The shut-off valve is of the normally closed type and is installed above the inlet pipe of the oil tank as well as below the outlet valve. When the oil flows normally, automatic or manual control can be employed. When automatic control is used, it can be interconnected with various safety devices such as the oil pump motor controller, level gauge controller, and combustible gas alarm. In the event of a high level alarm, a combustible gas alarm, or some other safety incident, the shut-off valve will use the relevant alarm signals to immediately cut off the supply of oil or the hazardous chemical liquid, with the emergency shut-off valve closing rapidly. This prevents the possibility of the accident escalating further; this valve is a safety valve and should not be used as a service valve. Manual control is used for temporary emergency situations, such as during debugging. The manual valve should be closed after debugging is completed! It should not be used under normal circumstances to avoid loss of control.