LDA-F
Liquid Detonation Flame Arrester for filling and drain lines - internal installation
Features
Siphon Protection
Offers Increased Safety
Low Risk
Low Risk of Fouling
Low Pressure Loss
For Flammable Liquids
Useable for Nearly All Flammable Liquids
Meets TRGS Requirements
TRGS = Technical Regulations for Hazardous Substances
Different Connections
Available With Different Connections
Function and Description
Main Component – PROTEGO® Flame Arrester Unit
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.
Prevention of Flame Spread in Tank During Ignition
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.
Reduction of Flame Propagation Speed
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.
For Explosion Groups IIA to IIB3
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). EU conformity according to the currently valid ATEX directive. Approvals according to other national/international regulations on request.
Product Data
Dimensions
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 |
Dimensions in mm / inches
Selection of explosion group
| MESG | Expl. Gr. (IEC / CEN) | Gas Group (NEC) |
| > 0,90 mm | IIA | D |
| ≥ 0,65 mm | IIB3 | C |
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
Material selection for housing
| Design | A | B |
| Housing | Steel | Stainless Steel |
| Shock absorber | Steel | Stainless Steel |
| Gasket | FPM | PTFE |
| Flame arrester unit | A | A |
Special materials upon request
Material flame arrester unit
| Design | A |
| FLAMEFILTER® cage | Stainless Steel |
| FLAMEFILTER®* | Stainless Steel |
| Spacer | Stainless Steel |
* the FLAMEFILTER® are also available in the materials Tantalum, Inconel, Copper, etc. when the listed housing and cage materials are used.
Special materials upon request
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other connections upon request
Outlet type
| Straight pipe | I |
| Beveled pipe | II |
| EN 1092-1, Form B1 or DIN 2501, Form C | III (EN or DIN) |
| ASME B16.5 CL 150 R.F. | III (ASME) |
other types upon request
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).
