TSC - Combined Steel & Rubber Spring Unit Isolators

Sizes (T1, T2, T3 & T10)

A major advance in design has successfully combined the best characteristics of steel springs and rubber springs to produce an efficient, compact and economical range of unit isolators suitable for many types of applications. Many of the variants of these isolators designed and manufactured by us have now been in service for more than twenty years.

TSC unit isolators are highly effective in reducing the transmission of vibration, structure-borne noise and shock from a wide range of rotating and reciprocating machinery and in protecting sensitive apparatus from external disturbances. They are particularly suitable for marine and mobile applications as internal snubbers are incorporated to control movement of the isolated machine.

Type approval by Det Norske Veritas and general type approval has been given by Lloyd's Register of Shipping.


Design Features:
  • Helical steel spring to BS1726 Class B.
  • Inclined rubber springs are first grade natural rubber to metal bonded elements.
  • SG iron castings to BS EN 1563:1997 EN-GJS-400/15. Alternative lightweight aluminium castings to BS1490 LM25 TB7 (Size T3 only).
  • Steel spring in most variants is isolated from the top casting by resilient seating pad reducing transmission of high frequency vibration and effectively damping spring coil surge resonance.
  • Springs are pre-compressed on assembly, resulting in high equivalent static deflection and load capacity with minimum change between loaded and unloaded height.
  • Rubber spring elements are effectively protected by the top casting and its extended skirt.
  • Both types of spring support a proportion of the total load and thus the overall rate of creep is much reduced compared to an equivalent all-rubber unit isolator.
  • A selection of steel and rubber springs, each having different vertical and lateral stiffness closely controlled in manufacture is available to facilitate the choice of the most appropriate isolator characteristics for a particular application.
  • Combined rebound and overload buffer is adjustable to permit optimum setting to be achieved throughout service life (Size T3 only).

Application Notes:
  • Optimum system stiffness characteristics can be achieved by careful orientation of individual isolators.
  • Optional soleplate is available to facilitate installation on resin chocks.
  • All connections to and from isolated machine must include flexible lengths, not only to prevent transmission of vibration through the connections and allow the system freedom of movement, but also to avoid possible failure of the connections.
  • Analysis of the isolated system is normally undertaken by Christie & Grey to predict the response to ship motion, machine forces and shocks to enable the correct selection of flexible connections.
Design Disclaimer

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TSC - All Variants TSC Size T1 & T2 TSC Size T3 TSC Size T10