Shock absorbers and dynamic components
Shock absorbers are usually employed to protect thermal systems against sudden shocks. LISEGA shock absorbers do not restrict gradual thermal expansion. When subjected to sudden movements which exceed designated velocity limits, the shock absorber "locks up" momentarily and forms a rigid connection.
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Shock absorbers type 30
Series produced standard design.
Available from stock or from running
production.
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Shock absorbers type 31
Type 31 shock absorbers are specially
designed to deal with large loads. They
are mainly used in nuclear power stations to protect steam generators and large pumps. Due to the restricted space in such areas, their dimensions are generally designed to suit the given conditions.
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Installation extensions type 33
Type 33 extensions are used to bridge
larger installation lengths, thus avoiding structural
adjustments on site.
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Weld-on brackets type 35
This unit is used as a connection for shock absorbers
type 30 and 31, energy absorbers type 32 and rigid struts type 39 (also for types 16, 20, 27), and forms the structural attachment.
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Energy absorber (E-bar) type 32
In cases of minimal movement, energy absorbers can be used as an alternative to shock absorbers. A minor dynamic displacement, harmless for the system, is permitted through an adjustable free stroke. If the free stroke previously set is exceeded, movement is restricted by limit stops. Undesirable stress peaks are avoided through conversion of kinetic energy to deforming energy via expansion of the housing.
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Rigid struts type 39
Rigid struts form a rigid connection in axial direction between piping and structure. As the rigid strut has articulated connecting points, limited movement of the pipe within the angular movement of the struts is permitted with no resistance.
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Dynamic pipe clamps type 36, 37
In the sphere of dynamic supports, the design of pipe clamps is often not carried out with sufficient care. In spite of impeccable main support units (shock absorbers, rigid struts and energy absorbers), the functioning of the whole construction can be adversely affected by faulty pipe clamps.
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Dynamic pipe clamps type 36
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Dynamic pipe clamps type 37
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Special clamp for angular arrangement
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Dynamic axial pipe clamp with shock absorbers
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Pipe whip restraints
One speciality in the area of dynamic pipe supports is the pipe whip restraint. Alongside the energy absorber type 32, which provides the optimum solution to this problem, a U-bolt design for specially large loads has proven to be highly successful.
Pipe whip restraints are exclusively used in the nuclear industry. They dampen and absorb the kinetic energy of bursting pipes in emergency cases. For this purpose, the elongation capacity of the encompassing U-bolts is used, as they are designed to absorb the expected dynamic loads.
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