Selection of emergency shut-off valves for storage tanks

A flange spacing of 500 is more than enough to fit a ball valve with a switch; if the flange spacing is considered too short, a triple-eccentric butterfly valve can also be used, with an insert ring added in between.

This post was last edited by shiwendong on 2017-8-20 at 10:57. Overview of explosion-proof emergency shut-off valves, oil depot emergency shut-off valves, storage tank emergency shut-off valves, methanol emergency shut-off valves, and ethanol emergency shut-off valves: The NDFB41 series of emergency shut-off valves (hereinafter referred to as shut-off valves) are a new type of emergency shut-off valve developed by our company. They serve as reliable and essential safety devices for preventing oil leaks in oil depots, as well as accidents such as oil spills, fires, and explosions in storage tanks. 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 explosion-proof emergency shut-off valve. This product is suitable for use in oil depots and chemical plants, as well as in oil tanks and pipelines for the inflow and outflow of liquids. In the event of an overflow or leakage of oil or chemical liquids, or in case of a fire, this valve can be used to quickly shut off the flow of such liquids. 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
Product model: NDFB41-16
Nominal diameter: DN100, DN150, DN200, DN250, DN300
Structural type: Piston-type
Applicable media: Oils, chemicals, water, liquefied gas, and chemically mildly corrosive fluids
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
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 Engler oils, and various chemical liquids. 2. The power supply voltage fluctuation must not exceed ±10% of the rated voltage. 3. A filtering device must be installed on the inlet pipeline. 4. The ambient temperature should range from -40°C to +55°C. 5. The ambient humidity should not exceed 90%. V: Working principle of the explosion-proof emergency shut-off valve: The shut-off valve is of the normally closed type, and it 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 utilize 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.

Class A and B liquefied gas storage tanks are equipped with emergency shut-off devices for the inlet and outlet pipelines of the installation, as well as functions to prevent the liquid level from exceeding the maximum or minimum levels. To avoid disrupting batch processing, bypass systems are also installed when necessary. So one can’t settle for less

If there is already material stored in the tank, the root valves of the inlet and outlet pipes can be closed, the intermediate pipe section removed, and then reassembled using the tank’s interlocking and sequential SIL instruments.

This fuse valve is good; what is used to drive the valve to operate?

Question: Does a pneumatic cut-off valve for methanol need to consider fire protection?

Fire protection should be considered; ball valves should be selected in accordance with API607.