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The devices enable slow movements due to thermal dilatation in both
directions and oppose only low resistance to such movements. But when
the movement speed leads to dynamic forces that are harmful to the
installation, the snubbers are immediately locked
at the desired set speed and support the dynamic force by transferring
it to the fixed structure. Once the disturbance has passed, the device
returns to its initial state and enables slow movements once again.
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The devices therefore prevent damage due to :
 - Earthquakes
- Water hammer
effects
- Violent
thrusts due to safety valve discharge
- Strong gusts
of wind
- Other similar
disturbances
QUIRI
Hydromécanique has perfected
Snubbers especially adapted for use in severe environments in power
plants and nuclear installations for frequencies up to 100
Hz. The standard range extends from load capacities of 12.5kN
up to 8,500KN with travel ranges of up to 350mm, with all fixing accessories
(rods, welding straps, extensions etc.). Other capacities and travel
ranges are available on request. Snubbers can also be designed for
damping of low frequency movements.
The QUIRI technology has been used for more than 25 years and has some key advantages
- The QUIRI snubbers are using forged raw material, no welding and no casting
- The QUIRI snubbers use internal volume compensation system with metallic bellows.
They can be used in any position and do not need external tank
- High stiffness
- Maintenance free product
- Special high performance tightness
- Exclusive SCLV valve, without any risk of blocking
- Symmetrical design
- Standard range from 8 to 8500kN
All the snubbers are individually tested on dynamic test benches of 10, 50 and 850T.
These Snubbers are fitted to a large number of nuclear
plants in
France (for EDF), Corea, South Africa, China, India, to the nuclear
aircraft carrier "Charles de Gaulle" and many power plants and
petrochemical installations.
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