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HV-series - Blast Dampers

HV-series Blast Dampers are designed for protection

of ventilation systems against the effects of vapor and

dust cloud explosions. The HV-series Blast Dampers

are applied in shielding of industrial facilities, such as

Oil & Gas platforms and refineries or related buildings

against destructive blast forces. The HV-series offers

substantially higher air flow capacity and increased level

of safety, as well as flexibility in design of duct systems.

Structure of the HV-series damper is corrosion free, hot

dip galvanized steel or EN 1.4404 (AISI316L) in the HV-

SS version.

The HV-series damper has spring loaded closing blades

built in a fully welded damper body to close the air

passage in case of explosion or sudden increase of

overpressure in the HVAC system. The threshold trigger

pressure of the damper can be adjusted according to

customer specification.

Once closed the blades will remain in closed position

until they are manually reset after the incident.

The HV-series dampers are available as ATEX certified

(optional).

Main components

The HV-series Blast dampers comprise of the following

main components:

• HV-blast damper is manufactured of galvanized or

stainless steel, EN 1.4404 (AISI316L)

• Fully welded damper body made of 5 mm steel

• Closing blades and shafts provided with stainless

steel bearings

• Adjustable trigger mechanism

• Fragment grill

• Positive and negative phase protection

HV-SERIESBlast Dampers

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HV-series - Blast Dampers

Design criteria

The HV-series Blast Damper is designed for hazardous

environments with a possibility of dust or vapor cloud

explosion. Design criteria is a long duration pressure

wave with finite rise time and 1 bar (14,5 psi) peak

overpressure. HV-series blast damper can be adjusted

to close on a minimum overpressure of 0,03 bar (0,44

psi).

Test and performance data

Performance of the HV-series Blast Damper is

verified by tests in a large scale vapor cloud explosion

simulator to effectively attenuate slowly rising (rise

time over 300 ms) long duration pressure wave loads

within the load range up to 1.0 bar. The damper is also

tested to withstand the impact of high velocity flying

objects according to ASTM E 1886 – 05 and 1996 – 05.

The damper is designed to function within the operating

temperature range of -50…+80ºC. In high heat related

to explosion, 300ºC for 40 min.

Product coding

The HV-series Blast Dampers are coded as follows:

• Blast Damper HV-700x700 = damper width

700mm, damper height 700mm, material hot dip

galvanized steel

• Blast Damper HV-1500x1500-SS = damper width

1500mm, damper height 1500mm, material

stainless steel AISI316L

Airflow characteristics

Air flow characteristics of the standard size HV-series

Blast Dampers are given in the chart below. The flow

curves are measured at 20 ºC corresponding to air

density of 1.2 kg/m3.

Example:

Needed airflow is 15000 m3/h

and max. allowed pressure

drop is 40 Pa. Product size

1000x1000 is selected.

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AIR FLOW

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HV-series - Blast Dampers

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Opening max. (mm)

Blast DamperSteel wall Concrete wall Dimensions (mm) Weight

A B K L F G H kgHV-300x300 300 300 130 130 340 95 95 55

HV-500x500 500 500 350 350 560 130 130 95

HV-700x700 700 700 550 550 760 80 80 170

HV-1000x1000 1000 1000 850 850 1060 80 80 300

HV-1500x1500 1500 1500 1370 1370 1580 115 115 535

GENERAL DRAWING OF HV-BLAST DAMPER

The HV-series Blast Dampers are dimensioned

according to the duct size or wall opening.

Standard sizes are:

• 300 mm x 300 mm

• 500 mm x 500 mm

• 700 mm x 700 mm

• 1000 mm x 1000 mm

• 1500 mm x 1500 mm

The dampers are also available in custom sizes with

steps of 100 mm in each direction between the limits.

Note: G and H are greater than 75 mm but less than or equal to 150 mm.

The nominated duct size (internal) is A x B (width x height).

Flanges are also available according to ISO 15138 standard.

Operational mechanism side

C

D

A

B

E

F

G G

HH

Ø14

150

150

150 150

BM

BM

HV Blast Damper Size

The following list presents common details to address

in determining the blast damper size:

• Airflow requirement

• Duct size

• Maximum allowable pressure drop

• Wall thickness and composition

• Damper mounting alternative

• Material (hot dip galvanized or stainless steel)

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HV-series - Blast Dampers

INSTALLATION ALTERNATIVES

Exterior surface wall installation

HV Blast Dampers may be mounted on exterior vertical

wall surfaces. Connection is via bolting directly to the

wall (in concrete walls) or bolting with machine bolts

to metal surfaces. In cases where wall rough openings

are not sized for the blast damper a mounting plate

may be used. This application is commonly used to

protect rooms or where a direct connection to a duct is

not required.

Interior surface wall installation

When installing the HV Blast Damper to the interior of

the wall, the damper is connected using installation

frame. The frame is set into the concrete wall during

casting phase of building. Damper is bolted on the

frame in later phase.

Duct installation

The HV Blast Damper´s design allows it to be bolted

in-line with duct work. In these situations the ductwork

prior to the blast damper must be designed blast

resistant. Both blast and protected sides of the

damper body accept direct connection to ductwork.

Exterior roof installation

HV Blast Damper may be mounted on exterior

horizontal roof surfaces. The damper can be bolted

directly on concrete or steel roof construction.

Installation manual with detailed installation

instructions and bolt recommendations is included in

the delivery. Bolts, installation frame and arming tool

can be ordered separately.