LDA-F

LDA-F

Liquid Detonation Flame Arrester
for filling and drain lines - internal installation

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.

Features and Advantages

  • 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
  • available with different connections
* 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"
a550 / 21.65550 / 21.65650 / 25.59650 / 25.59850 / 33.46875 / 34.451050 / 41.341250 / 49.211450 / 57.091600 / 62.991975 / 77.76
b588 / 23.15590 / 23.23692 / 27.24695 / 27.36895 / 35.24925 / 36.421102 / 43.391305 / 51.381505 / 59.251662 / 65.432043 / 80.43
c775 / 30.51775 / 30.51875 / 34.45875 / 34.451075 / 42.321095 / 43.111270 / 50.001480 / 58.271680 / 66.141830 / 72.052275 / 89.57
d140 / 5.51140 / 5.51220 / 8.66220 / 8.66275 / 10.83275 / 10.83356 / 14.07457 / 17.99508 / 20.00600 / 23.62711 / 27.99
DN25 / 1"32 / 1¼“40 / 1½“50 / 2"65 / 2½“80 / 3"100 / 4"125 / 5"150 / 6"200 / 8"250 / 10"
a550 / 21.65550 / 21.65650 / 25.59650 / 25.59850 / 33.46875 / 34.451050 / 41.341250 / 49.211450 / 57.091600 / 62.991975 / 77.76
b588 / 23.15590 / 23.23692 / 27.24695 / 27.36895 / 35.24925 / 36.421102 / 43.391305 / 51.381505 / 59.251662 / 65.432043 / 80.43
c775 / 30.51775 / 30.51875 / 34.45875 / 34.451075 / 42.321095 / 43.111270 / 50.001480 / 58.271680 / 66.141830 / 72.052275 / 89.57
d140 / 5.51140 / 5.51220 / 8.66220 / 8.66275 / 10.83275 / 10.83356 / 14.07457 / 17.99508 / 20.00600 / 23.62711 / 27.99

Dimensions in mm / inches

LDA-F
Outlet type II
Outlet type III

Material selection for housing

Design AB
Housing Steel Stainless Steel
Shock absorber Steel Stainless Steel
GasketFPMPTFE
Flame arrester unitAA
Design AB
Housing Steel Stainless Steel
Shock absorber Steel Stainless Steel
GasketFPMPTFE
Flame arrester unitAA

Special materials upon request

Material 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 used.Special materials upon request

LDA-F
Outlet type II
Outlet type III

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

Outlet type

Straight pipeI
Beveled pipeII
EN 1092-1, Form B1 or DIN 2501, Form CIII (EN or DIN)
ASME B16.5 CL 150 R.F.III (ASME)
Straight pipeI
Beveled pipeII
EN 1092-1, Form B1 or DIN 2501, Form CIII (EN or DIN)
ASME B16.5 CL 150 R.F.III (ASME)

other types upon request

LDA-F
Outlet type II
Outlet type III

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-F
Outlet type II
Outlet type III
LDA-F
Outlet type II
Outlet type III