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AL-DK

Vent Valve, Lift-actuated 

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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 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
DN1200 / 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

Dimensions in mm / inches

Material

HousingSteel
Valve guideStainless Steel
GasketFPM

Special materials upon request

Selection and Design

The required quantity and 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 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 Tank pressure Tank pressure is the pressure within a tank. 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. 

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 pT (mbar or inch W.C.)
Pump rate (m³/h or CFH)

Flange connection type

EN 1092-1; Form B1andere Anschlüsse auf Anfrage
ASME B16.5 CL 150 R.F.

Other types upon request

Design Types and Specifications

Two designs are available:
Vent valve with two connectionsAL-DK
Vent valve with four connectionsAL-DK-4

Flow Capacity Chart

The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.

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 Deflagration flame arrester 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”.

Applications

Réservoirs de stockage à toit flottant

Stockage réfrigéré et cryogénique

Contacter le service RSE

Si vous avez des questions, des commentaires ou des suggestions, notre équipe d'experts se fera un plaisir de vous aider.

Picture of Mrs. Auris-Nadine Hillen
Mrs. Auris-Nadine Hillen

CSR Department

+49 (0)5307 809 108