Usually coiled type springs are used in variable type support. During compression, the resistance of a coil to a load changes, so these types of supports are named as ‘variables’. Actually pipe work under change in pressure & temperature results in vertical displacements. To accommodate/ absorb such vertical displacements, this type of support is recommended. They are generally used at points where stress due to transfer load does not have an adverse effect on the overall stress of the pipe work. A careful study is required for the piping system having a large flexibility because deflection is likely to occur even when there is only a small stress variation due to transfer load. Variable Spring Support has a wide range of application and it is important to select the proper one for a specific purpose. There are different designs for variable supports and so TECHNO INDUSTRY provides particular nomenclature to identify them. As many as seven (A to G) different types of variable spring support are obtained at present and they are given below:?
This type of support is suitable where there is sufficient installing space. It is mainly provided with a threaded bushing in the top plate, in order for a simple rod attachment for the upper connection.?
This type of support is mainly used where installing space is limited. It is generally furnished with one or two lugs welded to the top plate of the casing.?
This type of support is suitable where spring box/casing. For type ‘D’ a rod adjustment is permitted from the top. For type ‘E’ a rod adjustment is permitted from either above or below the spring.?
This type of support is designed to support the piping upward, i.e. from below, directly from the base/ floor or supporting steel. An adjustment in height is available by turning the load column and for fastening four holes is drilled at the base plate.?
This type of support is generally formed by welding two standard variable spring supports back to back at the ends of a pair of channels.
