LDA-WF(W)

LDA-WF(W)

In-Line Liquid Detonation Flame Arrester
for filling and drain lines - external installation

Function and Description

The PROTEGO® LDA-WF(W) series of liquid detonation flame arresters was developed for storage container filling 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 outside the container in the filling and drain lines. If the explosive atmosphereis ignited, the device prevents the combustion from traveling into the tank. The PROTEGO® LDA-WF(W) series of liquid detonation flame arresters combines 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, converted into a low-energy deflagration, and then stopped by the remaining immersion liquid and the PROTEGO® flame arrester.

The application range for the device is a product vapor/air mixture temperature of up to +60°C / 140°F and an absolute pressure up to 1.1 bar / 15.9 psi. Devices with special approval for higher temperatures are available upon request. This covers all possible operating conditions of empty lines for flammable liquids. The liquid detonation arrester is designed for pressures of up to 10 bar / 145 psi, resists explosion pressure, and provides protection for almost all flammable liquids. The device is approved for explosion groups IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm). Special designs with a cleaning cover for highly viscous liquids can be provided.

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

Features and Advantages

  • easily accessible due to external 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 TRbF* requirements
* TRbF = technical regulations for flammable liquids

Dimensions

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

DN25 / 1"32 / 1¼“40 / 1½“50 / 2"65 / 2½“80 / 3"100 / 4"125 / 5"150 / 6"200 / 8"250 / 10"
a250 / 9.84250 / 9.84350 / 13.78350 / 13.78450 / 17.72450 / 17.72500 / 19.69600 / 23.62600 / 23.62700 / 27.56900 / 35.43
b325 / 12.80325 / 12.80415 / 16.34415 / 16.34535 / 21.06535 / 21.06600 / 23.62915 / 36.02915 / 36.021090 / 42.911300 / 51.18
c475 / 18.70475 / 18.70605 / 23.82605 / 23.82831 / 32.72831 / 32.72936 / 36.581340 / 52.761340 / 52.761520 / 59.841750 / 68.90
d150 / 5.91150 / 5.91210 / 8.27210 / 8.27275 / 10.83275 / 10.83325 / 12.80460 / 18.11460 / 18.11510 / 20.08610 / 24.02
DN25 / 1"32 / 1¼“40 / 1½“50 / 2"65 / 2½“80 / 3"100 / 4"125 / 5"150 / 6"200 / 8"250 / 10"
a250 / 9.84250 / 9.84350 / 13.78350 / 13.78450 / 17.72450 / 17.72500 / 19.69600 / 23.62600 / 23.62700 / 27.56900 / 35.43
b325 / 12.80325 / 12.80415 / 16.34415 / 16.34535 / 21.06535 / 21.06600 / 23.62915 / 36.02915 / 36.021090 / 42.911300 / 51.18
c475 / 18.70475 / 18.70605 / 23.82605 / 23.82831 / 32.72831 / 32.72936 / 36.581340 / 52.761340 / 52.761520 / 59.841750 / 68.90
d150 / 5.91150 / 5.91210 / 8.27210 / 8.27275 / 10.83275 / 10.83325 / 12.80460 / 18.11460 / 18.11510 / 20.08610 / 24.02

Dimensions in mm / inches

LDA-WF(W)

Material selection for housing

Design AB
HousingSteelStainless Steel
Shock absorber Steel Stainless Steel
Gasket (shock absorber) FPM PTFE
Gasket (locking screw)PTFEPTFE
Flame arrester unitAA
Design AB
HousingSteelStainless Steel
Shock absorber Steel Stainless Steel
Gasket (shock absorber) FPM PTFE
Gasket (locking screw)PTFEPTFE
Flame arrester unitAA

Special materials upon request

Material selection for flame arrester unit

Design A
FLAMEFILTER® cageStainless Steel
FLAMEFILTER®*Stainless Steel
SpacerStainless Steel
Design A
FLAMEFILTER® cageStainless Steel
FLAMEFILTER®*Stainless Steel
SpacerStainless Steel

* the FLAMEFILTER® are also available in the materials Tantalum, Inconel, Copper, etc. when the listed housing and cage materials are usedSpecial materials upon request

LDA-WF(W)

Selection of explosion group

MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
> 0,90 mmIIAD
≥ 0,65 mmIIB3C
MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
> 0,90 mmIIAD
≥ 0,65 mmIIB3C

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 CL 150 R.F.
EN 1092-1; Form B1
ASME B16.5 CL 150 R.F.

other connections upon request

LDA-WF(W)

Flow Capacity Chart

The volume flow V in m³/h was determined with water according to DIN EN 60534 at a temperature Tn = 15°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).

LDA-WF(W)
LDA-WF(W)