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Expansion Joints
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An
expansion joint is an assembly designed to
safely absorb the heat-induced expansion and
contraction of various construction materials,
to absorb vibration, or to allow movement due to
ground settlement or earthquakes. They are
commonly found between sections of sidewalks,
bridges, railway tracks, piping systems, and
other structures.
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EXPANSION
JOINT - METALLIC & RUBBER |
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These
are generally utilised where higher pressure ratings
are encountered in the duct lines. Our Metallic
Expansion Bellows are fabricated out of Carbon
Steel/Mid Steel/Stainless Steel material depending
upon service conditions. These are generally designed
as per EJMA standards. These have been supplied to
eminent customers by us under stringent inspection
carried out by reputed agencies these are also
subjected to stringent quality control checks whereby
every joint is inspected for leakage as per
recommendations.
In special cases dye penetrant and radiographic
examination of weld joints are also conducted.
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Advantages of Non-Metallic Expansion Joints Over Metallic
Expansion Joints
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Large movement capability
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Total
number of Expansion joints in a duct work may be
reduced for better economy in duct design.
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Ability to accommodate axial, lateral torsional and
angular movements
- Duct
system can be greatly simplified.
- The
usage of costly toggles, hangers, supports, structures
and guides can be extensively reduced.
- Duct
work erection is simplified since too much care not be
taken for alignments.
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Negligible spring rates, very low spring forces during
movement
- Duct
support structures are simpler and lighter.
- No
reaction force on fixed supports.
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Corrosion-resistant by use of suitable fabric
combination
- Life
of joints increase.
- Low
material cost compared to corrosion resistant special
steels.
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High - temperature withstanding capability
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Low
material costs compared to high temperature-resistant
special metals.
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Vibration isolation and sound dampening properties
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Prevention of premature system degradation due to
vibrations.
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Protection from noise pollution.
- Easy
replacement of fabric part in case of any failure.
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Minimum downtime for maintenance.
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| RUBBER BELLOWS |
  Rubber
bellows are one of the essential products which are used for
Hydraulic Ram Protections, Fluid Filling Systems, chemical
Plants, Vibrating Arrangements and to accommodate
misalignment in the Duct Line.
The material used to manufacture the Bellows are Rubber,
Rubberised Canvas, Rubberised Synthetic Fibres with various
stiffeners for reinforcement to withstand desired pressure.
The Bellows can be given any shape - rectangular, square,
round as per the shape of the System with calculated length.
The Bellows Compressed Length and Free Length depend upon
the transversing zone. Flanges are incorporated as easy
fittings.
The Bellows can be used under acidic, alkaline conditions.
They can also be made to withstand a temperature of 250o
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EXPANSION JOINTS - NON-METALLIC - FABRIC TYPE |
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Boso
Flex compensators
They are installed as flexible connection in air & flue
gas duct system to compensate for inevitable expansion
which might lead to costly brake-down.
Boso Flex products range from single layer connection used
in ambient air-handling system to very complex
multiplayer construction used by Power Plants, Cement
Industries, Petrochemicals, Refineries and the
Fertilizers plant etc. These are divided into 4
categories in 26 standard types.
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High flexibility
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Resistance to corrosion
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Temperature resistance upto 1000 deg.C.
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Standard design absorption of vibrations
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Noise suppression
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Minimal reactive forces
Boso
Flex compensators are manufactured individually to suit
the specific requirement such as RECTANGULAR, CONICAL &
COMBINATION for which following data might be provided. |
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EXPANSION JOINTS - MULTI-LAYER - FABRIC TYPE
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BOSO
Flex
Expansion Joints are the result of intensive development.
They satisfy the need for a quick, economical, long life
expansion joint used to absorb thermal expansion and
vibration in hot gas duct work.
Standard Roll Sizes
Widths: 200 mm, 300 mm, & 400 mm
Lengths: 12.5m, 25m, 50m
Stock Delivery
Design and installation
BOSON Engineers are always available to discuss and
recommend the correct technical and more economical solution
to duct expansion problems whether they are new applications
or replacement of faulty expansion joints. To ensure the
correct fitting of the joints and to maximize their working
life. GBM has an experienced installation team available
toinstall expansion joints in India or abroad.
Choosing the right roll
BOSON engineers will be pleased to assist in selecting the
right roll for your application. However it will speed up
the process if you already have available the following
data:
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Gas
temperature
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Application
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Pressure-negative or positive.
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Expansion / movement
(if
replacement joint, size of gap to be filled)
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Environment - Dust Concentration
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Temperature |
Gas comp |
Construction |
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-20o Celsius to 250 |
Flue Gas |
Silicone Coated Glassfabric - outer layer
P.T.F.E. Foil (Acid resistant) - Middle layer
Glassfabric-Inner |
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-20o Celsius to 500 |
Flue Gas |
With 12mm thick special Ceramic Wool between
glassfabric and P.T.F.E. Foil |
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-20o Celsius to 600 |
Flue Gas |
With 25mm thick special Ceramic Wool between
glassfabric and P.T.F.E. Foil |
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| Boson Engineering © 2009. All Rights Reserved.
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