Características
Función y descripción
Automatic Venting Valves for Floating Roof Tanks
PROTEGO® Lift-Actuated Vent Valves Type AL-DK provide automatic venting of floating roof Techo flotante 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 Carrera Lift is the actual travel of the valve pallet from the main valve out of the closed position. actuation, which prevents inadmissible vacuum Vacío 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 Carcasa 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 Cordón de estanqueidad 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.
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 | ||||||
Dimensiones en mm / pulgadas
Material
| Housing | Steel |
| Valve guide | Stainless Steel |
| Gasket | FPM |
Special materials upon request
Tipo de bridas de conexión
| EN 1092-1; Form B1 | andere Anschlüsse auf Anfrage |
| ASME B16.5 CL 150 R.F. |
Other types upon request
Data Necessary for Specification
Stored product Product Includes equipment, protective systems, devices, components and combinations of these. Tank diameter (m or ft)Tank diameter (m or ft)
Tank height (m or ft)
Support height h1 (operating position with empty tank)
Support height h2 (lifted assembly position)
Maximum allowable tank pressure Presión del tanque Tank pressure is the pressure within a tank. pT (mbar or inch W.C.)
Pump rate (m³/h or CFH)
Selección y Diseño
The required quantity and nominal size Diámetro nominal 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 will be defined based on the calculated flow rate from the thermal venting and pumprate in lowest floating roof position (Nm³/h or CFH) and based on the maximum acceptable tank pressure pT (mbar / inch W.C.) according to the flow capacity charts. Special models are available on request.Flow rates and pressure losses of vent caps PROTEGO® EB or PROTEGO® LH/AD have additionally to be taken into account according to the appropriate charts in the relevant data sheetsor operating instructions.Modelo y especificación
Two designs are available:Diagrama de flujo volumétrico
Los diagramas de flujo volumétrico han sido determinados con un banco de pruebas de caudal calibrado y certifi - cado por TÜV. El flujo volumétrico V. en [m³/h] y el CFH se refi eren a las condiciones estándar de referencia de aire según ISO 6358 (20°C, 1bar). La conversión a otras densidades y temperaturas están referidas en el Vol. 1: “Fundamentos Técnicos”.
Application Examples for PROTEGO® AL-DK
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.
If resistance against endurance burning is not required the valves can alternatively be combined with PROTEGO® deflagration proof devices type PROTEGO® LH/AD. The applicable data sheets are available in volume 2 “ Deflagration Flame Arresters Apagallamas a prueba de deflagraciones Flame arrester designed to prevent the transmission of a deflagration. It can be an end-of-line flame arrester or an in-line flame arrester. , end-of-line and Vent Caps”.
