 Product Overview
 Tank Flaring
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Objective
Combustion with a low emission rate of CMHN and benzol, from storage tanks, tank batteries, etc. for cleaning purposes.
Installation of the flare system prior to and during tank cleaning
 A ventilator is mounted at the manhole lid of the crude-oil tank which will suck the mixture of hydrocarbon and hydrogen out of the tank. This mixture is then led to a special flare via a duct. At the flare entrance a second ventilator is  installed by which the flare gases are pressed into the flare tube through a flame trap. Due to the design of the flare, it is capable of burning mixtures containing a high amount of carburetted hydrogen gas and also mixtures below the lower limit of inflammability. For this purpose the flare is provided with supporting gas (propane or, as an alternative, petroleum gas) and combustion air via an additional ventilator. Through the admixture of air an explosive mixture is generated within the duct.
Therefore, the complete system is fitted with security equipment in order to prevent the flames from slashing back into the tube and the tank.
Built-in Security Devices
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At the tank, in front of the ventilator, a PROTEGO detonation protection device is installed
so that no flame may reach inside the tank. |
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In front of the flare entry, a 2nd PROTEGO detonation protection device is installed, so that no flame may slash back into the tube. |
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A measuring probe is installed at the flare in front of the detonation protection device. In case of an increase in temperature, an alarm is triggered and the gas duct is automatically closed by means of a shutter. |
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The speed of the flare gas is measured. If the speed fails to reach a specific minimum value, a regulator shutter is automatically closed. |
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1 additional hand-wheel valve within the gas duct, in front of the flare, may be closed by hand upon an emergency signal. |
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1 gas pilot outside the flare will burn permanently. |
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1 electro-pilot inside the flare will ignite the supporting gas flame. |
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A pneumatically controlled quick-acting valve has been provided at the suction opening of the venturi tube. This valve is automatically closed in case of an air outage.
A container for compressed air (designed for 10 closing operations) will safeguard the control in case of a pneumatic failure.
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The flame is continuously checked by a specialist visually and at the ignition board.
Structure of the Flare and the Ignition System including the Supervising System
Flare
The mobile flare may safely be installed on 3 claws outside the EX range. The flare stack is approximately 6m high, and thanks to the complete combustion the flame is hardly visible. If desired, the head may be fitted with an additional protective cap against noise and vision.
Monitoring and Ignition
The control- and ignition board is set up at a safe distance of at least 20m from the flare. The flaring procedure may be safely controlled from such a distance.
Connection to the Tank or Tank Battery
A DN .150 pipeline. PN16 may be installed without difficulty from the tank to the flare covering a distance of 100m and more.
Environmental Protection
Several measurements carried out by an independent institution have shown that all pollutants - even benzol - may be almost completely burnt without residues.
Résumé
Flaring is the most inexpensive and environmentally harmless method for disposing of the hydrocarbons and pollutants that occur when large tanks are cleaned.
Please do not hesitate to contact us for additional information.
Your contact:
engineering:
Mr. Bernd Bender, mobile: +49 173/ 67 78-556, E-mail: bernd.bender@prema-service.de
commercial: Mr. Achim Blum, phone: +49 6172/ 67 78-64, E-mail: achim.blum@prema-service.de
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