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BDH – Blast protection damper

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

BDH blast protection damper

  • Overview

  • Specification

  • Dimensions and Material Thickness

  • Material and Finishing

  • Product Models and Accessories

  • Weights

  • Installation

  • Downloads

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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
  • The normal open position of the blade angle is 45 degrees
  • ATEX certified
  • Recommended maximum air velocity is 10 m/s
  • Maximum shock and blast wave pressure is 1.0 bar
  • The normal operating temperature for a stainless steel damper is between -60 ºC to +80 ºC
  • The normal operating temperature for a 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 blast damper 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 an 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 the 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. Modular construction is available for larger sizes.
As a standard, flange width and bolt hole drilling are 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.
The damper has 1-6 blades. In a multiblade damper (2-6 blades), blades are connected via linkage and operate in parallel. Linkage thickness is 8 mm.
The debris catcher is a diameter of 6 mm wire. The open area between wires is 40 x 40 mm.

General BDH drawings

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
350 200 435
300 50 440
250 50 435
200 50 435
Damper size BxH Opening size steel wall / duct coaming (max) BxH
300×300 300×300
400×400 400×400
500×500 500×500
600×600 600×600
700×700 700×700
800×800 800×800
900×900 900×900
1000×1000 1000×1000
1100×1100 1100×1100
1200×1200 1200×1200

Flange dimensions according to ISO 15138

DIMENSIONS ØC Bolt P1, P2 BM F
If longest side < 350 10 M8 75…150 20 40
If longest side  351…1000 12 M10 75…150 30 50
If longest side > 1001 14 M12 75…150 40 80

General BDH drawings for concrete wall

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
350 200 435
300 50 440
250 50 435
200 50 435
Damper size BxH Opening size concrete wall BxH
300×300 300×300
400×400 400×400
500×500 500×500
600×600 600×600
700×700 700×700
800×800 800×800
900×900 900×900
1000×1000 1000×1000
1100×1100 1100×1100
1200×1200 1200×1200

Flange dimensions according to ISO 15138

DIMENSIONS ØC Bolt P1, P2 BM F P1, P2 CR F2
If longest side < 350 10 M8 75…150 20 40 75…150 75 95
If longest side  351…1000 12 M10 75…150 30 50 75…150 90 110
If longest side > 1001 14 M12 75…150 40 80 75…150 105 145

Material and Finishing

PART MATERIAL FINISHING
Frame Carbon steel Painted or hot-dip galvanised
Frame Stainless steel
EN 1.4404 (AISI 316L)		 –
Blades Carbon steel Hot-dip galvanised
Blades Stainless steel
EN 1.4404 (AISI 316L)		  –
Setting, closing and locking mechanism Stainless steel
EN 1.4404 (AISI 316L) and some parts EN 1.4305 (AISI 303) or similar		  –
Maintenance-free bearings Stainless steel
EN 1.4404 (AISI 316L)		  –
Shafts Stainless steel
EN 1.4404 (AISI 316L)		 –
Debris catcher Carbon steel Hot-dip galvanised
Debris catcher Stainless steel
EN 1.4404 (AISI 316L)		 –

Product Models and Accessories

Arming tool to open the damper, at least one tool per building.
Debris catcher to prevent large objects from entering the protected area.
Mesh finger guard for personnel safety to prevent touching armed blades. Can be installed on the protected side, exposed side or both.

Weights

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

Standard Halton Marine BDH dampers for concrete wall (kg)

H / HEIGHT
(mm)		 B / WIDTH (mm)
300 400 500 600 700 800 900 1000 1100 1200
200 44 47 50 53 56 59 62 65 68 71
300 55 60 64 68 72 76 80 84 89 93
400 67 72 78 83 88 94 99 104 110 115
500 79 85 92 98 105 111 118 124 131 137
600 90 98 106 113 121 129 136 144 152 159
700 102 111 120 129 137 146 155 164 173 181
800 114 124 134 144 154 164 174 184 193 203
900 129 140 151 162 173 185 196 207 218 229
1000 141 153 165 177 190 202 214 227 239 251
1100 152 166 179 193 206 219 233 246 260 273
1200 164 179 193 208 222 237 252 266 281 295

Installation

The damper can be installed vertically outside of the building wall or between duct flanges. Also, horizontal installation is possible on the duct, floor or roof but only in the top-down blast direction.
The wall (or floor/roof) material can be concrete or steel.
For concrete wall installation, a wide-flange version is used and the damper is installed using anchor bolts.
For steel wall installation, the damper is installed using bolts or by welding.
Detailed installation information is available in the BDH installation, operation and maintenance manual.

Downloads

  • BDH – Blast protection damper

    Data

    en

    Shape 2

  • BDH – Räjähdyspelti

    Data

    fi

    Shape 2

  • BDH – Clapet anti-souffle

    Data

    fr

    Shape 2

  • BDH – Explosionsschutzklappe

    Data

    de

    Shape 2

  • BDH 抗爆阀

    Data

    cn

    Shape 2

  • Halton BDH datasheet 2023

    Data

    English
    Shape 2

  • ATEX Certificate for Halton BDH

    Data

    English
    Shape 2

  • EAC Certificate for Halton FDA, FDB2, FDO, FDH, FCE, UTA, UTG, BDH, BRD, BLD

    Data

    Русский (ru)
    Shape 2
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