DE/S-MK VI - IIB3
High Velocity Pressure Relief Valve deflagration- and endurance burning-proof
Características
Função e descrição
High-Speed Pressure Relief Valve
The Deflagration Deflagration Explosion propagating at subsonic velocity. -Proof and Endurance-Burning-Proof PROTEGO® DE/S -MK VI type device Device A device is a pipe component that influences the media flow by opening, closing, or partially shutting off the flow channel or by dividing or mixing the media flow. is a state of the art high velocity vent valve working on the principle of a dynamic Flame Arrester Flame arrester Device fitted to the opening of an enclosure, or to the connecting pipe work of a system of enclosures, and whose intended function is to allow flow but prevent the transmission of a flame. . It is primarily used as a device for flame transmission proof venting of cargo spaces and loading systems of tankships during the loading process and on the journey. The valve offers reliable protection against excess pressure Pressure (gauge pressure) Pressure for which the value is equal to the algebraic difference between the absolute pressure and the atmospheric pressure. , prevents product Product Includes equipment, protective systems, devices, components and combinations of these. losses almost up to the set pressure Set pressure Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions. and provides protection against atmospheric deflagrations as well as endurance burning Endurance burning Stabilized burning for an unlimited time. if stabilized burning Stabilized burning Steady burning of a flame stabilized at, or close to the flame arrester element. occurs. The PROTEGO® DE/S-MK VI high velocity vent valve is available for substances of Explosion Explosion Abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously. groups IIB3 and IIC (NEC group C MESG ≥ 0,65 mm and B MESG < 0,50 mm).
Jump Characteristic
The valve cone (1) is kept in a closed position by a corrosion resistant permanent magnet (2). The set pressure is adjusted by the distance of the permanent magnet to its counterpart (3). Upon reaching the set pressure, the valve opens directly to a full lift Lift Lift is the actual travel of the valve pallet from the main valve out of the closed position. with only a minor pressure rise (jump characteristic). The set pressure is therefore very close to the maximum allowable working pressure ( MAWP Maximum allowable working pressure (MAWP) Maximum gauge pressure permissible at the top of a completed vessel in its normal operating position at the designated coincident temperature specified for that pressure. ) of the cargo space.
Advanced Manufacturing Technology
The tank pressure Tank pressure Tank pressure is the pressure within a tank. is maintained up to the set pressure with a tightness that is far superior to the conventional standard due to our state of the art manufacturing technology. This feature is ensured by valve seats made of high-quality stainless steel with an individually lapped valve cone. After the excess pressure is discharged, the valve reseats and provides a tight seal Seal A seal prevents or limits unwanted transfer of product from one container to another. Seal is used as superordinate term for all types of sealing elements. . The design of the valve cone and valve seat Valve seat The valve seat is a component on which the valve pallet rests when the valve is closed. produces a vertical, free jet that transports the gases far away from the discharge opening. This keeps the deck free of gas. The shape of the valve cone and valve seat promotes the drainage of rainwater when closed. A function check of the valve is easily performed with a manual lift gear (4) which Returns to its initial position after actuation. A lateral flange connection, DN2, is standard for a vacuum Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. valve (such as the PROTEGO® SV/E-S see volume 7).
Dynamic Flame Arresting Safety in Overpressure Relief Valves
If the set pressure is exceeded, explosive gas/product-vapour air mixtures are released to the atmosphere. When reaching the adjusted set pressure Adjusted set pressure Adjusted set pressure is the pressure at which a valve opens on a test bench. , the velocity at which the mixtures Exit the valve cone gap (5) (the gap between the valve seat and the valve cone) is much higher than the flame velocity. If this mixture ignites, flashback Flashback Phenomenon occurring in a flammable mixture of air and gas when the local velocity of the combustible mixture becomes less than the flame velocity, causing the flame to travel back to the point of mixture. into the tank is prevented. If the mixture flow continues and stabilized burning occurs, the dynamic flame arresting feature prevents flashback ignition even in the case of endurance burning. As the system pressure decreases, the discharge velocity at the valve cone gap decreases also. The design ensures, that even in the closing pressure range, the valve cone closes in a timely manner keeping the discharge velocity far above the flame velocity and thereby preventing flashback.
Tested against oscillating flow
The PROTEGO® DE/S-MK VI high velocity pressure relief valve High-velocity pressure relief valve A high-velocity pressure relief valve is designed to have nominal flow velocities that exceed the flame velocity of the explosive mixture, thus preventing flame transmission. is also approved for oscillating flow. If a very long pipe is installed between the cargo space and valve, chattering can occur due to the resistance in the pipe or resonance phenomena. This can especially occur during partial load operation. This so called „hammering“ does not occur when a sufficient flow passes through the valve and the flow in the upstream line does not stop. The design is therefore a function of the required flow capacity. Accordingly, there are two different designs: one with a lift of 10 mm and one with 50 mm.
Many Individual Certifications
The valve can be used at an operating temperature Operating temperature Temperature reached when the equipment is operating under design conditions. up to +60°C / 140°F; since the valve is approved for group IIB3 (NEC Group C) vapours, it also meets the requirements of European Marine Equipment Equipment Machines, appliances, fixed or mobile devices, control parts and accessories, and warning and prevention systems, whether separate or combined, intended for the generation, transfer, storage, measurement, control, and conversion of energy, and for the processing of materials, which have their own potential source of ignition and may cause an explosion. Directive 96/98/EC (MED). EU conformity according to the currently valid ATEX directive, approved according to IMO MSC/Circular 677, 1009 by GL (the C version). Approvals according to other national/international regulations on request.
Tabela de dimensões
To select the nominal size Nominal size The nominal size is an alphanumeric designation of size for components in a piping system, used for reference purposes, comprising the letters DN followed by a dimensionless integer that is indirectly related to the physical size of the bore or outside diameter of the connections, expessed in millimeters. (DN), please use the flow capacity chart on the following page
| DE / S with closed lateral connection DN 2 | ||||
| DN 1 | 80 / 3" | 100 / 4" | 150 / 6" | |
| a | 515 / 20.28 | 515 / 20.28 | 515 / 20.28 | |
| b | 195 / 7.68 | 195 / 7.68 | 195 / 7.68 | |
| c | 220 / 8.66 | 220 / 8.66 | 220 / 8.66 | |
| d | 120 / 4.72 | 120 / 4.72 | 120 / 4.72 | |
| e1 | 145 / 5.71 | 145 / 5.71 | 145 / 5.71 | |
| DE / S with lateral connection for vacuum relief valve Vacuum relief valve A vacuum relief valve is used to ventilate a part of the system and protects it from impermissible underpressure. DN 2 | ||||
| DN 1 | 80 / 3" | 100 / 4" | 150 / 6" | 150 / 6" |
| DN 2 | 80 / 3" | 80 / 3" | 80 / 6" | 150 / 6" |
| a | 515 / 20.28 | 515 / 20.28 | 515 / 20.28 | 515 / 20.28 |
| b | 195 / 7.68 | 195 / 7.68 | 195 / 7.68 | 195 / 7.68 |
| c | 220 / 8.66 | 220 / 8.66 | 220 / 8.66 | 220 / 8.66 |
| d | 120 / 4.72 | 120 / 4.72 | 120 / 4.72 | 120 / 4.72 |
| e2 | 100 / 3.94 | 100 / 3.94 | 100 / 3.94 | 100 / 3.94 |
Dimensões em mm
Seleção do material
| Design | A | B | C |
| Housing Housing A housing is a solid shell, which surrounds a content, either protecting the content from external influences, or protecting the environment from the content. | Steel | Stainless Steel | Hastelloy |
| Valve seat | Stainless Steel | Stainless Steel | Hastelloy |
| Valve cone | Stainless Steel | Stainless Steel | Hastelloy |
| Bellow | PTFE | PTFE | PTFE |
| Gasket | PTFE | PTFE | PTFE |
Special materials upon request
Seleção do grupo de explosão
| MESG | Expl. Gr. (IEC / CEN) | Gas Group (NEC) |
| ≥ 0,65 mm | IIB3 | C |
Special approvals upon request
Tipo de conexão flangeada
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Versão e especificação
There are four different designs* additional DN 2 information
Additional special designs upon request
Settings
| +60 mbar | +350 mbar | |
| +24 inch W.C. | +140 inch W.C. |
Higher or lower pressure settings upon request
Diagrama de vazão
Este diagrama de vazão foi determinado em uma bancada de medição de vazão calibrada e certificada pela TÜV. A vazão V em m³/h se refere ao estado técnico padrão de ar, conforme ISO 6358 (20°C, 1bar). Para conversão em outras densidades e temperaturas, veja o cap. 1: Bases técnicas.
