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BDH blast protection damper
BDH blast protection damper

BDH – Blast protection damper

Halton BDH blast dampers protect against overpressure in offshore, onshore and heavy industry ventilation systems.

Overview

  • Shock tube tested for detonation (shock) type pressure wave
  • Shock tube tested for deflagration (blast) type pressure wave
  • Shock tube testing in compliance with GSA TS01 and ASTM F 1642-04(2010).
  • Debris (steel balls and wood plank missile) impact tested
  • Debris impact testing in compliance with ASTM E 1886-13a and ASTM E 1996-14a
  • Aerodynamic testing according to EN 1751
  • Blade angle in normal open position is 45 degrees
  • ATEX certified
  • Recommended maximum air velocity 10 m/s
  • Maximum shock and blast wave pressure 1.0 bar
  • Normal operation temperature for stainless steel damper is between -60 ºC to +80 ºC
  • Normal operation temperature for carbon steel damper is between -20 ºC to +80 ºC

Specification

Halton BDH blast dampers protect against overpressure in offshore, onshore and heavy industry ventilation systems. The BDH can be installed in rectangular ducts or wall openings. When the blades are in the open position, the device does not cause significant pressure loss, noise or flow disturbance. The BDH has and adjustable arming mechanism to cope with different air velocity and closing pressure requirements. An open-closed indicator is visible on the outside of the damper.
There is no external power source needed to operate damper. In case of a blast incident, the pressure wave closes the blades. There is a locking mechanism preventing the blades from opening during the negative phase. After a blast incident, the blades remain locked in the closed position, until the damper is set (armed) again.

Dimensions and Material Thickness

BDH blast protection dampers are available for rectangular ducts and wall openings. Width B is 300-1200 mm, 25 mm division. Height H is 200-1200 mm, 50 mm division. Larger damper available as a modular construction.
As a standard, flange width and bolt hole drilling is according to ISO 15138 standard.
Frame depth is 400 mm, frame thickness is 5 mm.
Blade thickness is 5 mm, blade shaft diameter is 25 mm. Blades are bolted to shafts.
Damper has 1 – 6 blades. In multiblade damper (2 – 6 blades), blades are connected via linkage and operate in parallel. Linkage thickness is 8 mm.
Debris catcher is diameter 6 mm wire, open area between wires is 40 x 40 mm.

Damper size
BxH
Opening size
concrete wall (max)

Bf x Hf
Opening size
steel wall / duct / coaming (max)
BxH
300×300 190×190 300×300
400×400 280×280 400×400
500×500 380×380 500×500
600×600 480×480 600×600
700×700 580×580 700×700
800×800 680×680 800×800
900×900 780×780 900×900
1000×1000 880×880 1000×1000
1100×1100 970×970 1100×1100
1200×1200 1070×1070 1200×1200
H M K
1200 200 1190
1150 200 1140
1100 200 1090
1050 200 1040
1000 200 990
950 200 940
900 200 890
850 200 840
800 200 790
750 200 740
700 200 690
650 200 640
600 200 590
550 200 540
500 200 490
450 250 440
400 200 435

Flange dimensions according to ISO 15138

DIMENSIONS ØC F P1 P2 BM
If longest side < 350 10 40 75…150 75…150 20
If longest side 351…1000 12 50 75…150 75…150 30
If longest side > 1001 14 80 75…150 75…150 40

BDH, General Drawings

Material and Finishing

PART MATERIAL FINISHING
Frame Carbon steel Painted or hot dip galvanised
Frame Stainless steel
EN 1.4404 (AISI316L)
Blades Carbon steel Hot dip galvanised
Blades Stainless steel
EN 1.4404 (AISI316L)
 –
Setting, closing and locking mechanism Stainless steel
EN 1.4404 (AISI316L)
 –
Maintenance-free bearings Stainless steel
EN 1.4404 (AISI316L)
 –
Shafts Stainless steel
EN 1.4404 (AISI316L)
Debris catcher Carbon steel Hot dip galvanized
Debris catcher Stainless steel
EN 1.4404 (AISI316L)

Product Models and Accessories

Arming tool to open the damper, at least one tool per building.
Debris catcher to prevent large objects from entering to protected area.

Weights

Weights of standard Halton Marine BDH dampers (KG)

H/Height 

(mm)

 B/Width (mm)
300 400 500 600 700 800 900 1000 1100 1200
200 41 43 46 49 52 55 57 60 63 66
300 52 56 60 63 67 71 75 79 83 87
400 63 68 73 78 83 88 93 98 103 108
500 74 80 86 92 99 105 111 117 123 129
600 85 92 100 107 114 122 129 136 143 151
700 96 105 113 122 130 138 147 155 164 172
800 107 117 126 136 146 155 165 174 184 193
900 122 133 143 154 165 175 186 197 207 218
1000 133 145 157 168 180 192 204 216 227 239
1100 144 157 170 183 196 209 222 235 248 260
1200 155 169 183 197 211 226 240 254 268 282

Installation

Damper can be installed outside of the building wall, or between duct flanges.
Wall material can be concrete or steel.
In concrete wall, damper is installed using anchor bolts.
In steel wall, damper is installed using bolts or by welding.
Detailed information on installation available on BDH installation, operation and maintenance manual.

Downloads

BDH – Blast protection damper
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BDH – Blast protection damper
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BDH – Blast protection damper
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