LH/AD

LH/AD

Deflagration Flame Arrester, End-of-Line

Function and Description

The PROTEGO® LH/AD end-of-line deflagration flame arrester provides protection against flame transmission through atmospheric deflagration. The device is typically installed on vent lines of vessels and process engineering apparatus which are not pressurized. For safe application it is important that an endurance burning situation can be excluded, so typically it is installed on vent lines which discharge vapour for a short time period only. The device prevents flame transmission from atmospheric deflagration into the vessel or plant.

The PROTEGO® LH/AD consists of a housing (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 animals out. The FLAMEFILTER® (4) gap size will depend on the devices intended use. Detailing the operating conditions such as the temperature, explosion group and the composition of the fluid, enables PROTEGO® to select the best end-of-line deflagration flame arrester for your application. 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).

The standard design can be used with operating temperature of up to +60°C / 140°F. Devices with special approval can be obtained for higher temperatures upon request.

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

Features and Advantages

  • Weather hood provides protection against environmental impact (harsh weather conditions, bird nests, etc.)
  • available in sizes DN 50 (2“) – up to DN 800 (32“)
  • easy maintenance
  • available for elevated operating temperatures
  • protection against atmospheric deflagration
  • low operating and lifecycle cost
  • cost effective device
  • cost effective spare parts

Dimensions

To select the nominal size (DN), please use the flow capacity charts on the following pages

DN abc*c*
IIB3IIC
50 / 2"100 / 3.94200 / 7.87170 / 6.69185 / 7.28
80 / 3"150 / 5.91240 / 9.45180 / 7.09195 / 7.68
100 / 4"200 / 7.87295 / 11.61220 / 8.66235 / 9.25
150 / 6"300 / 11.81550 / 21.65260 / 10.24270 / 10.63
200 / 8"300 / 11.81550 / 21.65260 / 10.24270 / 10.63
250 / 10"400 / 15.75600 / 23.62355 / 13.98365 / 14.37
300 / 12"400 / 15.75600 / 23.62340 / 13.39350 / 13.78
350 / 14"600 / 23.62800 / 31.50390 / 15.35400 / 15.75
400 / 16"600 / 23.62800 / 31.50380 / 14.96390 / 15.35
500 / 20"700 / 27.561000 / 39.37400 / 15.75410 / 16.14
600 / 24"800 / 31.501200 / 47.24475 / 18.70485 / 19.09
700 / 28"1000 / 39.371400 / 55.12505 / 19.88515 / 20.28
800 / 32"1200 / 47.241600 / 62.99550 / 21.65560 / 22.05
DN abc*c*
IIB3IIC
50 / 2"100 / 3.94200 / 7.87170 / 6.69185 / 7.28
80 / 3"150 / 5.91240 / 9.45180 / 7.09195 / 7.68
100 / 4"200 / 7.87295 / 11.61220 / 8.66235 / 9.25
150 / 6"300 / 11.81550 / 21.65260 / 10.24270 / 10.63
200 / 8"300 / 11.81550 / 21.65260 / 10.24270 / 10.63
250 / 10"400 / 15.75600 / 23.62355 / 13.98365 / 14.37
300 / 12"400 / 15.75600 / 23.62340 / 13.39350 / 13.78
350 / 14"600 / 23.62800 / 31.50390 / 15.35400 / 15.75
400 / 16"600 / 23.62800 / 31.50380 / 14.96390 / 15.35
500 / 20"700 / 27.561000 / 39.37400 / 15.75410 / 16.14
600 / 24"800 / 31.501200 / 47.24475 / 18.70485 / 19.09
700 / 28"1000 / 39.371400 / 55.12505 / 19.88515 / 20.28
800 / 32"1200 / 47.241600 / 62.99550 / 21.65560 / 22.05

Dimensions in mm / inches * c are reference values. Exact measures depend on the flange connection.

LH/AD

Material selection for housing

Design AB
HousingSteelStainless Steel
Weather HoodStainless SteelStainless Steel
Protection screenStainless SteelStainless Steel
Flame arrester unitA, BB
Design AB
HousingSteelStainless Steel
Weather HoodStainless SteelStainless Steel
Protection screenStainless SteelStainless Steel
Flame arrester unitA, BB

Special materials upon request

Material combinations of flame arrester unit

Design AB
FLAMEFILTER® cageSteelStainless Steel
FLAMEFILTER®Stainless SteelStainless Steel
Design AB
FLAMEFILTER® cageSteelStainless Steel
FLAMEFILTER®Stainless SteelStainless Steel

Special materials upon request

LH/AD

Selection of explosion group

MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
≥ 0,65 mmIIB3C
< 0,5 mmIICB
MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
≥ 0,65 mmIIB3C
< 0,5 mmIICB

Special approvals upon request

Specification of max. operating temperature

≤ 60°C / 140°FTmaximum allowable operating temperature in °C
-Designation
≤ 60°C / 140°FTmaximum allowable operating temperature in °C
-Designation

higher operating temperatures upon request

Flange connection type

EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF
EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF

other types upon request

Design Types and Specifications

Following designs are available:

Deflagration flame arrester, end-of-line, basic design

LH/AD

Deflagration flame arrester, end-of-line, basic design

LH/AD

Special designs available on request

LH/AD

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). Conversion to other densities and temperatures refer to Vol. 1: “Technical Fundamentals”.

LH/AD
LH/AD