Liquid Detonation Flame Arrester for filling and drain lines - internal installation
- siphon protection offers increased safety
- low risk of contamination
- low pressure loss
- provides protection against deflagrations and stable detonations
- useable for nearly all flammable liquids
- meets TRGS* requirements
- available with different connections
Function and Description
The PROTEGO® LDA-F series of liquid detonation arresters was developed for storage tanks filling and drain lines that are not continuously filled with product and sometimes contain a combustible mixture. The integrated siphon protection (1) with PROTEGO® flame arrester unit (2) additionally prevents the liquid, in which the lines are immersed, from being siphoned off while the container is being drained. The PROTEGO® flame arrester unit consists of several FLAMEFILTER® discs (3) and spacers firmly held in a FLAMEFILTER® casing (4). The number of FLAMEFILTER® discs and their gap size depends on the arrester’s intended use.
The device is installed inside the container at the end of the line and prevents the combustion from being transferred into the tank if the explosive atmosphere ignites. The PROTEGO® LDA-F series of liquid detonation arresters combine the classic PROTEGO® flame arrester design with the siphon principle in which the liquid product serves as a barrier to flame propagation.
When a highly accelerated pipe deflagration or detonation occurs, the combustion pressure and flame propagation speed are substantially reduced by the design, converted into a low-energy deflagration, and then stopped by the remaining immersion liquid and the PROTEGO® flame arrester.
The application limits for the device is product vapor/air mixture temperatures up to +60°C / 140°F and an absolute pressure up to 1.1 bar / 15.9 psi. This covers all possible operating conditions of empty lines for flammable liquids. The liquid detonation arrester in standard design is pressure resistant up to 10 bar / 145 psi. The device protects against nearly all flammable liquids and is approved for explosion groups IIA to IIB3 (NEC group D and C MESG ≥ 0.65 mm). Type-approved in accordance with the current ATEX Directive and EN ISO 16852, as well as other international standards.
To select the nominal size (DN), please use the flow capacity chart on the following pages
|DN||25 / 1"||32 / 1¼“||40 / 1½“||50 / 2"||65 / 2½“||80 / 3"||100 / 4"||125 / 5"||150 / 6"||200 / 8"||250 / 10"|
|a||550 / 21.65||550 / 21.65||650 / 25.59||650 / 25.59||850 / 33.46||875 / 34.45||1050 / 41.34||1250 / 49.21||1450 / 57.09||1600 / 62.99||1975 / 77.76|
|b||588 / 23.15||590 / 23.23||692 / 27.24||695 / 27.36||895 / 35.24||925 / 36.42||1102 / 43.39||1305 / 51.38||1505 / 59.25||1662 / 65.43||2043 / 80.43|
|c||775 / 30.51||775 / 30.51||875 / 34.45||875 / 34.45||1075 / 42.32||1095 / 43.11||1270 / 50.00||1480 / 58.27||1680 / 66.14||1830 / 72.05||2275 / 89.57|
|d||140 / 5.51||140 / 5.51||220 / 8.66||220 / 8.66||275 / 10.83||275 / 10.83||356 / 14.07||457 / 17.99||508 / 20.00||600 / 23.62||711 / 27.99|
Material selection for housing
|Shock absorber||Steel||Stainless Steel|
|Flame arrester unit||A||A|
Material flame arrester unit
|FLAMEFILTER® cage||Stainless Steel|
Selection of explosion group
|MESG||Expl. Gr. (IEC / CEN)||Gas Group (NEC)|
|> 0,90 mm||IIA||D|
|≥ 0,65 mm||IIB3||C|
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.|
|EN 1092-1, Form B1 or DIN 2501, Form C||III (EN or DIN)|
|ASME B16.5 CL 150 R.F.||III (ASME)|
Flow Capacity Chart
The volume flow V in m³/h was determined with water according to DIN EN 60534 at a temperature Tn = 20°C and an atmospheric pressure pn = 1,013 bar, kinematic viscosity v = 10-6 m²/s
To avoid electrostatic charge of flammable liquids the maximum flow is limited (refer to TRGS 727, CENELEC-Report CLC/TR 60079-32-1).