Archive for May, 2013

  • May
  • 28
  • 2013

Rubber Expansion Joints Applications

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Rubber12Rubber expansion joints provide time-tested ways to accommodate pressure loads, relieve movement stresses, reduce noise, isolate vibration, compensate for misalignment after plants go on stream and prolong life of motive equipment. Rubber expansion joints, designed by engineers and fabricated by skilled  craftsmen, are used in all systems conveying fluids under pressure and/or vacuum at various temperatures.


  • Air Conditioning, heating and ventilating systems in commercial, and institutional buildings, schools, apartments, stores, hospitals, motels, hotels and ships.
  • Central and ancillary power-generating stations in communities, factories, buildings and aboard ships.
  • Sewerage disposal and water treatment plants.
  • Process piping in paper & pulp, chemical, primary metal and petroleum refining plants.


Careful selection of the expansion joint design and material for a given application, as well as properly engineered installation are important factors in determining performance. These factors should be fully evaluated by every person selecting and applying expansion joints for any application.

  • May
  • 17
  • 2013

Fabric Expansion Joint Applications

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Fabric Expansion Joint Applications. Fabric Expansion Joints are used to take up vibration and thermal expansion in air & flue gas duct systems.
As a guide, all applications can be divided into general categories based on media composition (Air or Gas), temperature and pressure.

Expansion Joints

Clean Air Systems (-40 to +200c) (+/-50 kpa)
Single layer expansion joint material such as coated fabrics, plastics, fluoropolymers and fluoro elastomers with options to be reinforced with a fabric / polester fibre material. Suitable for heating and ventilation systems, fans and conveyors.

Air & Flue Gas Systems (-35 to +575c) (+/-50kpa)
Multi layers consisting of various densities and strengths of glass fabric and thermal glass insulation layer. A gas tight layer of PTFE foil with external layer of silicone coated fabric or alternatively with gas tight layer of reinforced PTFE laminate / coating. Construction arrangement is determine by temperature, pressure, medium and system movements. Suitable for Power Plants, Cement, Smelters and Refineries.

Hot Flue Gas Systems (-35 to + 1000c) (+/-50kpa)
Again multi layer construction ulitilisng robust high strength glass fabric layers with thermal glass insulation layer. To provide strength & stability and temperature resistance a layer of stainless steel wire mesh & bands is placed on the gas side. External protection with a layer of durable and strong PTFE based laminate. For very hot applications such as Smelters and Furnaces.

Depending on the application operating conditions the bolster can be made up from different material combinations: outers layers of various types of glass fabrics and stainless steel wire mesh and internal fillers of eiither or combination of loose glass insulation and glass felt layers. Bolsters provide protection to the fabric expansion joint from thermal temperature, dust particles and pulsations

  • May
  • 09
  • 2013

Gas Turbine Fabric Expansion Joints.

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GTX Gas Turbine Fabric Expansion Joints are available in a variety of steel frame designs and fabric expansion joint materials. All standard fabric expansion joint designs can be modified to suit most customer requirements.

The new revolutionary fabric expansion joint design solutions introduced with the GTX-range of fabric expansion joints that have been achieved through several years of testing, involving intensive use of FEA-calculations (Finite Element Analysis). There are three standard fabric expansion joint designs available:

GTX-A: This fabric expansion joint is used in applications that have no pressure pulses and have fairly smooth flow velocities. The fabric expansion joint design is typically used on units installed down stream of the gas turbine, after the diffuser sections where the gas flow characteristics have smoothed.

GTX-B: This is the most commonly used fabric expansion joint design that will withstand normal pressure pulses and flow conditions. A unit composed of this fabric expansion joint design can be installed e.g. at the bypass outlet sections or after the diffuser sections.

GTX-C: This fabric expansion joint design is recommended for heavy-duty gas turbine exhaust applications where high pressure pulsations with turbulent flow conditions exist.

Based on the information provided by our customer, the choice of bellows type is generally suggested by SIlverfox.