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DA-UB

In-Line Detonation Flame Arrester
for unstable and stable detonations and deflagrations in a straight through design with a shock tube, bidirectional

Función y Descripción

The in-line detonation flame arresters type PROTEGO® DA-UB are the newest generation of flame arresters. On the basis of fluid dynamic and explosion-dynamic calculations and decades of experience from field tests, a line was developed that offers minimum pressure loss and maximum safety. The device uses the Shock Wave Guide Tube Effect (SWGTE) to separate the flame front and shock wave. The result is an in-line detonation flame arrester without a classic shock absorber, and the use of flame-extinguishing elements is minimized.

The devices are symmetrical and offer bidirectional flame arresting for deflagrations, stable and unstable detonations. The arrester essentially consists of two housing parts with an integrated shock tube (1) and the PROTEGO® flame arrester unit (2) in the center. The PROTEGO® flame arrester unit is modular and consists of several FLAMEFILTER® discs (3) and spacers firmly held in a FLAMEFILTER® cage. The number of FLAMEFILTER ® discs and their gap size depends on the arrester‘s conditions of use.

By indicating the operating parameters such as temperature, pressure and explosion group and the composition of the fluid, the optimum detonation arrester can be selected from a series of approved devices. PROTEGO® DA-UB flame arresters are available for explosion groups IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm).

The standard design can be used up to an operating temperature of +60°C / 140°F and an absolute operating pressure up to 1.1 bar / 15.9 psi. Numerous devices with special approval can be supplied for higher pressures (see table 3) and higher temperatures.

Type-approved in accordance with the current ATEX Directive and EN ISO 16852 as well as other international standards.

Características especiales y ventajas

  • optimized performance from the patented Shock Wave Guide Tube Effect (SWGTE)
  • less number of FLAMEFILTER® discs from the use of the patented shock tube (SWGTE)
  • modular flame arrester unit enables each individual FLAMEFILTER® discs to be replaced and cleaned
  • different series allow increase of FLAMEFILTER® size for given flange connection resulting in lower pressure drop across the device
  • service-friendly design
  • expanded application range for higher operating temperatures and pressures
  • bidirectional operation as well as any direction of flow and installation position
  • possible installation of temperature sensors
  • minimum pressure loss and associated low operating and life-cycle cost
  • cost efficient spare parts
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Modelo y especificación

There are four different designs available:

Basic design of the detonation arrester

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In-line detonation flame arrester with integrated temperature sensor* as additional protection against short time burning

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Detonation arrester with two integrated temperature sensors* as additional protection against short time burning from both sides

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In-line detonation flame arrester with heating jacket

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Basic design of the detonation arrester

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In-line detonation flame arrester with integrated temperature sensor* as additional protection against short time burning

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Detonation arrester with two integrated temperature sensors* as additional protection against short time burning from both sides

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In-line detonation flame arrester with heating jacket

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Additional special arresters upon request
*Resistance thermometer for device group II, category (1) 2 (GII cat. (1) 2)

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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”.

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