Features
Venting and Breathing of Floating Roof Tanks
The Device Is Used for Automatic Venting and Breathing of Floating Roof Tanks
Low Position of the Floating Roof
In the Low Position of the Floating Roof, the Valve Opens Automatically to Prevent Vacuum or Overpressure
Different Heights
Due to Different Heights of the Floating Roof's Low Position for Operational and Assembly Settings, Specific Dimensions Must Be Provided
Conversion
During the Conversion of the Floating Roof's Support Legs From Operational to Maintenance Position, the Plunger Must Be Extended
Adjustment Through an Adjustment Option
Adjustment Is Achieved Through an Adjustment Option Using a Locking Pin Secured With a Cotter Pin
Not Flame Transmission Proof
The Valve Is Not Flame Transmission Proof
Function and Description
Automatic Venting Valves for Floating Roof Tanks
PROTEGO®
Lift
Lift
Lift is the actual travel of the valve pallet from the main valve out of the closed position.
-Actuated
Pressure/vacuum relief valve
Pressure/vacuum relief valve is an umbrella term that includes pressure or vacuum relief valve as well as pressure and vacuum relief valve.
Vent Valves Type AL-DK provide automatic venting of
floating roof
Floating roof
A floating roof is the roof of a tank that is fitted with floating chambers (pontoons) and lies on top of the liquid.
tanks when the floating roof is lowered onto its supports and the tank is either drained or refilled. When the floating roof is in its lowest position, the valve is forced to open through lift actuation, which prevents inadmissible
vacuum
Vacuum
Vacuum is the pressure in an enclosed space that is lower than the ambient pressure.
during final draining or inadmissible pressure during refilling.
Design of Valves
The PROTEGO® AL-DK valve consists of a
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.
(1) with a sheet metal panel to be welded onto the floating roof or a flange for mounting on a mating flange, two or four connection nozzles (2) for installation of vent caps, cover (3), lift (4) including valve disc (5), lift pipe (6), and the condensate drain valve (7) which can be designed to be flame transmission proof. The condensate drain is sealed by a flat gasket attached to the valve disk (5). The cover (3) is sealed by a
sealing cord
Sealing cord
A sealing cord is a synthetic cord with a circular or square profile. It is used to seal off components.
(8).
Dimensions for Different Floating Roof Heights
As the lowest position of the floating roof varies for operation and assembly, specify the dimensions h1 and h2:
h1: Distance between the lower edge of sheet-metal panel (or mounting flange) and the tank bottom in lowest position of floating roof (operating position with an empty tank).
h2: Distance between the floating roof in lifted
maintenance
Maintenance
Combination of all technical and administrative actions, including supervision actions, intended to maintain or restore a unit in working order.
position and the height of the floating roof in fully lowered operating position (operating position with an empty tank).
Conversion of Floating Roof Supports and Extension of the Plunger
If the floating roof supports are changed from operating position to maintenance position, the lift has to be extended as well. This is done with an adjustable locking pin that is secured with a split pin.
The valve is not flame transmission proof.
Based on a hazard analysis with regard to material selection and function, the valves have no potential ignition sources. As a result, they are not subject to the European
Explosion
Explosion
Abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously.
Protection Directive (ATEX) when used in explosive atmospheres.
Product Data
Maßtabelle für AL-DK und AL-DK-4
| AL-DK | AL-DK-4 | |||||||
| DN1 | 200 / 8" | 200 / 8" | 200 / 8" | 200 / 8" | 250 / 10" | 250 / 10" | 200 / 8" | 200 / 8" |
| DN2 | 80 /3" | 100 /4" | 150 / 6" | 200 / 8" | 150 / 6" | 200 / 8" | 100 /4" | 200 / 8" |
| a | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 |
| b | 465 / 18.31 | 465 / 18.31 | 465 / 18.31 | 515 / 20.28 | 465 / 18.31 | 515 / 20.28 | 465 / 18.31 | 650 / 25.59 |
| c | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 |
| d | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 600 / 23.62 |
| e | 345 / 13.58 | 360 / 14.17 | 385 / 15.16 | 415 / 16.34 | 385 / 15.16 | 415 / 16.34 | 415 / 16.34 | 415 / 16.34 |
| f | 460 / 18.11 | 445 / 17.52 | 285 / 11.22 | 370 / 14.57 | 285 / 11.22 | 367 / 14.45 | 445 / 17.52 | 370 / 14.57 |
| x | 658 / 25.91 | 920 / 36.22 | ||||||
Dimensões em mm
Material
| Corpo | Aço |
| Guia da Válvula | Aço |
| Vedação | FPM |
Materiais especiais mediante consulta
Tipo de conexão flangeada
| EN 1092-1, forma B1 ou DIN 2501, forma C, PN 16 , a patir DN 200 PN 10 | EN ou DIN |
| ASME B16.5 CL 150 R.F. | ASME |
Outras conexões mediante consulta
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.
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Lift-actuated vent valves of type PROTEGO® AL-DK can be combined with vent caps type EB which are deflagration Deflagration Explosion propagating at subsonic velocity (EN 1127-1:1997). proof and resistant against endurance burning Endurance burning Stabilized burning for an unlimited time. . This ensures flame transmission proof ventilation.
Se não for exigida segurança contra combustão contínua, também é possível uma combinação com dispositivos à prova de deflagração do tipo PROTEGO® LH/AD. Os respectivos folhetos podem ser encontrados no capítulo 2 "Calotas de respiro".
Applications
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