DR-UN
In-Line Detonation Flame Arresterfor stable detonations and deflagrations in right angle design with shock absorber, unidirectional
Features
Fastest Disassembly and Assembly
of single FLAMEFILTER®
Modular Design
allows replacement and cleaning of single FLAMEFILTER®
Spare Parts
cost-effective flame arrester / spare parts
Use of Patented Shock Wave Guide Tube Effect (SWGTE)
low number of FLAMEFILTER® discs due to the patented Shock Wave Guide Tube Effect (SWGTE)
Low Costs
low operating and lifecycle costs
Easy Maintenance
without disassembling of the FLAMEFILTER®
Function and Description
Secure potentially explosive plants against pipe deflagrations and stable detonations
The PROTEGO® DR-UN
in-line detonation flame arrester
In-line detonation flame arrester
A detonation flame arrester is designed to prevent the transmission of a detonation.
are used to secure potentially explosive plants against pipe deflagrations and stable detonations. In the right-angle design and with the PROTEGO® DR/U identical dimensions, the PROTEGO® DR-UN offers considerable
maintenance
Maintenance
Combination of all technical and administrative actions, including supervision actions, intended to maintain or restore a unit in working order.
and cost benefits. Once a
detonation
Detonation
Explosion propagating at supersonic velocity and characterized by a shock wave (EN 1127-1: 1997).
enters the
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.
, energy is absorbed from the detonation shock wave by the integrated
shock absorber
Shock absorber
A shock absorber is a device that reduces the kinetic energy of a detonation.
(1) before the flame is extinguished in the narrow gaps of the FLAMEFILTER® (3).
For Explosion groups IIA to IIB3
The
PROTEGO® flame arrester unit
PROTEGO® flame arrester unit
The PROTEGO® flame arrester unit is the main component of a flame arrester. It prevents flame propagation.
(2) consists of several FLAMEFILTER® discs and spacers firmly held in the
FLAMEFILTER® cage
FLAMEFILTER® cage
The FLAMEFILTER® cage is a housing for a FLAMEFILTER® set.
(4). The gap size and number of FLAMEFILTER® discs are determined by the operating data of the mixture flowing in the line (
explosion
Explosion
Abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously.
group, pressure, temperature). This device is approved for explosion groups from IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm).
The standard design is approved at an
operating temperature
Operating temperature
Temperature reached when the equipment is operating under design conditions.
up to +60°C / 140°F and an absolute
operating pressure
Operating pressure
Operating pressure is the pressure existing at normal operating conditions within the system being protected.
up to 1.2 bar / 17.4 psi.
EU conformity according to the currently valid ATEX directive.
Product
Product
Includes equipment, protective systems, devices, components and combinations of these.
Data and Features
Dimensions
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 charts on the following pages
| DN | 25/ 1" | 32 / 1 ¼" | 40 / 1 ½" | 50 / 2" | 65 / 2 ½" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8“ |
| a | 100 / 3.94 | 125 / 4.92 | 140 / 5.51 | 150 / 5.91 | 160 / 6.30 | 185 / 7.28 | 250 / 9.84 | 300 / 11.81 | 350 / 13.78 |
| b | 125 / 4.92 | 150 / 5.91 | 160 / 6.30 | 165 / 6.49 | 185 / 7.28 | 195 / 7.68 | 250 / 9.84 | 300 / 11.81 | 350 / 13.78 |
| c | 189 / 7.44 | 214 / 8.43 | 259 / 10.2 | 264 / 10.39 | 307 / 12.09 | 317 / 12.08 | 374 / 14.72 | 464 / 18.27 | 707 / 27.83 |
| c1 | 280 / 11.02 | 310 / 12.20 | 370 / 14.57 | 375 / 14.76 | 485 / 19.09 | 495 / 19.49 | 585 / 23.03 | 705 / 27.75 | 1170 / 46.06 |
| d | 149 / 5.87 | 149 / 5.87 | 210 / 8.27 | 210 / 8.27 | 275 / 10.83 | 275 / 10.83 | 325 / 12.80 | 460 / 18.11 | 620 / 24.41 |
| e | - | - | - | - | 326 / 12.83 | 336 / 13.23 | 403 / 15.87 | 475 / 18.70 | 707 / 27.83 |
| xy | 475 / 18.70 | 500 / 19.69 | 570 / 22.44 | 580 / 22.83 | 690 / 27.17 | 700 / 27.56 | 770 / 30.31 | 905 / 35.63 | 1305 / 51.38 |
Dimensions in mm / inches
* upon request
Selection of explosion group
| MESG | Expl. Gr. (IEC / CEN) | Gas Group (NEC) |
| > 0,90 mm | IIA | D |
| ≥ 0,65 mm | IIB3 | C |
Selection of max. operating pressure
| Expl. Gr. | DN | 25/ 1" | 32 / 1 ¼" | 40 / 1 ½" | 50 / 2" | 65 / 2½" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8“ |
| IIA | Pmax | - | - | - | 2,0 / 29.0 | 2,0 / 29.0 | 2,0 / 29.0 | 2,0 / 29.0 | 1,2 / 17.4 | 1,6 / 23.2 |
| IIB3 | Pmax | 1,4 / 20.3 | 1,4 / 20.3 | 1,4 / 20.3 | 1,4 / 20.3 | 1, 2 / 17.4 | 1, 2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,1 / 15.9 |
Pmax = maximum allowable operating pressure in bar / psi (absolute)
Specification of max. operating temperature
| ≤ 60°C / 140°F | Tmaximum allowable operating temperature in °C |
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other connections upon request
Design Types and Specifications
There are two different designs available:Basic design of the
detonation arrester
Detonation flame arrester
Flame arrester designed to prevent the transmission of a detonation.
DR-UN- – - –
In-line detonation flame arrester with
integrated temperature sensor
Integrated temperature sensor
Temperature sensor integrated into the flame arrester, as specified by the manufacturer of the flame arrester, in order to provide a signal suitable to activate counter measures.
* as additional protection against
short time burning
Short time burning
Stabilized burning for a specific time.
DR-UN-T- –
*Resistance thermometer for device group II, category (1) 2 (GII cat. (1) 2)
Material selection for housing
| Design | 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 |
| Cover with shock absorber | Steel | Stainless Steel |
| O-Ring | FPM | PTFE |
| Flame arrester unit Flame arrester unit Flame arrester casing with FLAMEFILTER® set. | A | C, D |
Special materials upon request
Material combinations of flame arrester unit
| Design | A | C | D |
| FLAMEFILTER® cage | Steel | Stainless Steel | Stainless Steel |
| FLAMEFILTER®* | Stainless Steel | Stainless Steel | Hastelloy |
| Spacer Spacer The spacer is a component that is generally used in a PROTEGO® flame arrester as a spacer within the FLAMEFILTER® se | Stainless Steel | Stainless Steel | Hastelloy |
* Other FLAMEFILTER® materials upon request
Special materials upon request
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”.
Applications