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An expansion joint is designed to allow deflection in the axial (compressive), lateral (shear), or angular (bending) deflections. Expansion joints can be non-metallic or metallic (often called bellows type). Non-metallic can be a single ply of rubberized material or a composite made of multiple layers of heat and erosion resistant flexible ...
The expansion joint hinges provide for angular movement and will resist pressure thrust forces. [4] Individual hinged expansion joints used in piping systems are restricted to pure angular rotation by its hinges. As a pair, hinged expansion joints will function together to absorb lateral deflection.
Metal flashing should be provided with expansion joints on long runs to prevent deformation of the metal sheets due to expansion and contraction, and should not stain or be stained by adjacent materials or react chemically with them. An important type of potential chemical reaction between metal flashing materials is galvanic corrosion. Copper ...
Piping expansion joint: In this application, a short section of bellows is connected between pipes to absorb thermal movement and vibration, typical in high-vacuum, high-temperature, cryogenic, or high purity systems, and factory-sealed systems that must not allow any gas leakage to or from the interior for a lengthy service life.
They are differentiated according to the three basic types of movement: axial, angular and lateral expansion joints. Expansion joints have usage in various sectors, like energy production, paper industry, chemical industry, water treatment, oil and gas. Expansion joints can be used wherever thermal movements or vibration occurs in pipelines.
The disc seal is of special practical interest because it is a simple method to make a seal to low expansion borosilicate glass without the need of special tools or materials. The keys to success are proper borating, heating of the joint to a temperature as close to the melting point of the copper as possible and to slow down the cooling, at ...
Slip joints are sometimes found in tubular structures such as piping but are generally avoided for this application due to requirements for sealing against leakage, instead of using either a large loop that is allowed to flex or a semi-rigid bellow. Slip joints are used when the main problem is a large axial movement. [1]
Hydrophilic strip applied waterstops should not be used in contraction or expansion joints per the instructions of most commercial manufacturers. Hydrophilic waterstops can only be effective if they are allowed to swell; therefore, water must be present to activate the hydrophilic agent.
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