Application

The use of snubbers is preferred in thermally operated plant components. In a dynamic event, snubbers instantaneously provide a fixed, practically rigid connection between the component to be secured and the surrounding structure. In this way the dynamic energy from abrupt displacement can be absorbed at once and harmlessly dissipated. The thermal displacements during routine operation remain free of any significant resistance thanks to the specialised operating principles of the snubbers.

Mode of operation

The function of LISEGA hydraulic snubbers type 30 is controlled by a main control valve positioned axially in the hydraulic piston. On slow movement of the piston, the valve is held open by spring force and the hydraulic fluid can flow freely from one cylinder chamber into the other. On rapid piston movement above a velocity limit, back pressure develops on the valve disk and closes the valve. The hydraulic flow is interrupted and the movement blocked.

The operational mode of LISEGA hydraulic snubbers type 31 is in principle based on the same concept as of type 30. The particularities of size require a different arrangement of the compensating reservoir. At the same time, a different arrangement of the valves is also necessary.

Scope of performance

Load

3 kN to 5,000 kN / 674.43 lbf to 1,124,044.72 lbf

Stroke

100 to 750 mm / 3.94 to 29.53 in

LISEGA Benefits

LISEGA snubbers are characterised by superior functionality and durability due to:

  • Type 30
  • Type 31 front view
  • Type 31 rear view
    • Name plate with all relevant technical data

    • Indicator for fluid level

    • Indicator for piston position

    • Compensating reservoir

    • Connecting lugs

    • Compensating reservoir

    • Name plate with all relevant technical data

    • Control valves to achieve high operating precision

    • Indicator for piston position

    • Indicator bar for fluid level

  • Corrosion-resistant materials
  • Radiation-resistant and wear-resistant sealing systems
  • Vibration-resistant guides
  • Pressurised hydraulic system for optimal sealing
  • Dynamic functional behaviour
  • Tested and approved for minimum 23 years maintenance-free operation
  • Lifespan of 60 years
  • Certified by suitability tests acc. to KTA 3205.3 and approvals acc. to ASME-NCA 3800

Connections

    • Weld-on bracket type 35

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    • Weld-on bracket type 35

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    • Connecting lug

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    • Weld-on bracket type 35

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    • Weld-on bracket type 35

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    • Installation extension type 33 with length adjustment

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    • Weld-on bracket type 35

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    • Flange for connection to existing extensions

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    • Weld-on bracket type 35

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    • Weld-on bracket type 35

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    • Short extension without length adjustment

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    • Connecting lug

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    • Weld-on bracket type 35

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    • Weld-on bracket type 35

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    • Special lug

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Products and services

A complete product portfolio of more than 12,000 standardised components covers all support situations, operational loads, temperatures and travel ranges normally experienced in piping systems in industrial plant construction. LISEGA’s modular system provides the corresponding basis. All components have a connection compatible with their load groups.

Industries

  • Product group 1Constant hangers and constant supports

  • Product group 2Spring hangers and spring supports

  • Product group 3Dynamic components

  • Product group 4Pipe clamps, clamp bases, pipe connections

  • Product group 5Roller bearings, pipe saddles and cryogenic pipe supports

  • Product group 6Connection components

  • Product group 7Structural attachments, slide plates

  • Product group 8LICAD

  • Product group 9Supplementary services