LH/AD
Deflagration Flame Arrester, End-of-Line
Features
Comprehensive Weather Protection
weather hood
Weather hood
A weather hood is a cover to protect the internal components of a device from environmental influences.
with protection screen protects 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.
against environmental impact, such as nesting animals and weather conditions
Various Sizes
available for DN 50/2“- bis DN 800/32“- pipes
Extended Application Range
for elevated operating temperatures and pressures
Spare Parts
cost-effective flame arrester / spare parts
Low Costs
low operating and lifecycle costs
Saftey
provides protection against atmospheric deflagrations, short-time burning
Easy Maintenance
without disassembling of the FLAMEFILTER®
Function and Description
Protection Against Atmospheric Deflagrations
The PROTEGO® LH/AD end-of-line
deflagration
Deflagration
Explosion propagating at subsonic velocity (EN 1127-1:1997).
flame arrester provides protection against flame transmission through atmospheric deflagration. 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.
is typically installed on vent lines of vessels and plant
equipment
Equipment
Machines, appliances, fixed or mobile devices, control parts and accessories, and warning and prevention systems, whether separate or combined, intended for the generation, transfer, storage, measurement, control, and conversion of energy, and for the processing of materials, which have their own potential source of ignition and may cause an explosion.
which are not pressurized. For safe application, it is important that an
endurance burning
Endurance burning
Stabilized burning for an unlimited time.
situation can be excluded. So typically, it is installed on vent lines which discharge vapor for a short time period. The device prevents flame transmission from atmospheric deflagration into the
vessel
Vessel
Container or structural envelope in which materials are processed, treated or stored.
or plant.
Main Component - PROTEGO® Flame Arrester
The PROTEGO® LH/AD consists of the
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), a weather hood (2), and the PROTEGO® flame arrester unit (3). The device is equipped with a metal weather hood. A protection screen is installed between the weather hood and the housing to keep out animals and foreign bodies. The FLAMEFILTER® (4) gap size depends on the device’s intended use. Specifying the operating conditions, such as the temperature,
explosion
Explosion
Abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously.
group and the composition of the fluid, enables PROTEGO® to select the best end-of-line deflagration flame arrester for your application.
For Explosion groups IIA and IIC
The PROTEGO® LH/AD series end-of-line deflagration flame arrester is available for substances from explosion groups IIA to IIC (NEC groups D to B). Special certifications for carbon disulfide are available.
The standard design can be used with an
operating temperature
Operating temperature
Temperature reached when the equipment is operating under design conditions.
of up to +60°C / 140°F. Devices with special approval for higher temperatures are available upon request.
EU conformity according to the currently valid ATEX directive. Approvals according to other national/international regulations on request.
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 | a | b | c* | c* |
| IIB3 | IIC | |||
| 50 / 2" | 100 / 3.94 | 200 / 7.87 | 175 / 6.89 | 185 / 7.28 |
| 80 / 3" | 150 / 5.91 | 240 / 9.45 | 180 / 7.09 | 195 / 7.68 |
| 100 / 4" | 200 / 7.87 | 295 / 11.61 | 220 / 8.66 | 235 / 9.25 |
| 150 / 6" | 300 / 11.81 | 550 / 21.65 | 260 / 10.24 | 270 / 10.63 |
| 200 / 8" | 300 / 11.81 | 550 / 21.65 | 260 / 10.24 | 270 / 10.63 |
| 250 / 10" | 400 / 15.75 | 600 / 23.62 | 355 / 13.98 | 365 / 14.37 |
| 300 / 12" | 400 / 15.75 | 600 / 23.62 | 340 / 13.39 | 350 / 13.78 |
| 350 / 14" | 600 / 23.62 | 800 / 31.50 | 390 / 15.35 | 400 / 15.75 |
| 400 / 16" | 600 / 23.62 | 800 / 31.50 | 380 / 14.96 | 390 / 15.35 |
| 500 / 20" | 700 / 27.56 | 1000 / 39.37 | 400 / 15.75 | 410 / 16.14 |
| 600 / 24" | 800 / 31.50 | 1200 / 47.24 | 475 / 18.70 | 485 / 19.09 |
| 700 / 28" | 1000 / 39.37 | 1400 / 55.12 | 505 / 19.88 | 515 / 20.28 |
| 800 / 32" | 1200 / 47.24 | 1600 / 62.99 | 550 / 21.65 | 560 / 22.05 |
Dimensions in mm / inches
* c are reference values. Exact measures depend on the flange connection.
Selection of explosion group
| MESG | Expl. Gr. (IEC / CEN) | Gas Group (NEC) |
| ≥ 0,65 mm | IIB3 | C |
| < 0,5 mm | IIC | B |
Special approvals upon request
Specification of max. operating temperature
| ≤ 60°C / 140°F | Tmaximum allowable operating temperature in °C |
| - | Designation |
higher operating temperatures upon request
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Design Types and Specifications
Following designs are available:Deflagration flame arrester, end-of-line, basic designLH/AD
Special designs available on request
Material selection for housing
| Design | A | B |
| Housing | Steel | Stainless Steel |
| Weather Hood | Stainless Steel | Stainless Steel |
| Protection screen | Stainless Steel | Stainless Steel |
| Flame arrester unit Flame arrester unit Flame arrester casing with FLAMEFILTER® set. | A, B | B |
Special materials upon request
Material combinations of flame arrester unit
| Design | A | B |
| FLAMEFILTER® cage | Steel | Stainless Steel |
| FLAMEFILTER® | Stainless Steel | Stainless Steel |
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