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Product group 3
encompasses all those components which are dynamically stressed, i.e.,
subject to alternating load directions. These dynamic restraints are
fitted to protect piping and other plant components against unforeseen
displacement resulting from shocks. Normal operational thermal
expansion must not be thereby obstructed. Shocks can be caused by
internal or external stimuli, such as water hammer or earthquake.
Additional
conceptional applications are the support of planned thermal expansion
through guides and the securing of points of zero movement. With
vertical riser pipes, the formation of "flexible" fixed points is a
frequent requirement.
For optimum
coverage of the various applications, specialized products are
correspondingly required. Where up-to-date pipe support concepts are
concerned, LISEGA’s rigid struts, energy absorbers and shock absorbers
(snubbers) form indispensable elements for the control of dynamic loads.
Shock absorbers (Snubbers) Type 30, 31
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. LISEGA hydraulic shock absorbers, with their
well-tried and tested design principle, have proven themselves in safe,
long-term and maintenance-free operation.
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non-corroding materials |
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special sealing systems |
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vibration-proof guiding systems |
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pressurized self-contained hydraulics |
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full dynamic response |
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proven maintenance-free operation longer than 20 years |
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comprehensive range of accessories |
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approval through independent authorities |
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The design load covers a spectrum of 3 - 5.000
kN. The standard range encompasses type 30 and stretches to 1000 kN.
Furthermore, type 31 is custom-built to specific requirements.
LISEGA
maintains a continuous series production of shock absorbers. At least 4,000 items are supplied annually, predominantly to nuclear
installations. Most of these are used to replace obsolete designs in
order to reduce maintenance costs.
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