The preset locks fitted to hanging types are removed by rotating the turnbuckle to increase load until the locks are free - the locks are then withdrawn from the spring unit. They also must be removed prior to system operation. When fitted, the hydrostatic locks prevent the spring deflecting during hydrostatic tests. The preset locks are fitted with a label drawing attention to the fact that these must be removed prior to system operation. This range of variable spring supports is preset to the installed load position prior to despatch. attempting to remove the travel stops without all load removed from the stops can result in property damage or personal injury.
Rotation of the turnbuckle, transfers the pipe load to the spring hanger.īase mounted supports are located in the desired position beneath the pipe - load is transferred from the pipe to the support by means of rotating the central column.Īt no point prior to or during the installation process should the travel stops be removed. Hanging type supports are installed in position on the supporting steelwork, the sling rod is connected between the pipe attachment (clamp or lug) and the spring hanger turnbuckle. permissible load deviation amounts to 25% of the operating load. The load difference between the cold and hot positions acts on the piping as a reaction force and is limited by the relevant design specifications.Generally, the max. The corresponding hot load position results from the theoretically determined pipe movement (travel) and the spring rate. Spring hangers and supports should be set in such a way that the spring load and the piping weight correspond with the cold load position.
To take precautions against this, the use of PTFE bearings is recommended. Where there is considerable horizontal displacement of the support load, and steel slides on steel, lateral forces can under certain conditions have an adverse effect on the operation of the support system. If the installation location does not permit suspension, then this Spring Support is a suitable alternative as a "prop" support. Whether this or any other principle is followed for the selection of variable spring supports, care must be taken to ensure that sufficient travel is available in the spring assembly to permit free movement of the pipe within the required pipework movement range cold or hot.
This ensures no abnormal or excessive forces, due to out of balance supporting effort, is transferred to the pipework in its stressed working condition. In keeping with generally accepted practice, it's recommend that the actual pipe load is correctly supported when the pipe is in its normal working position. It is therefore usual to select variable spring supports on this basis. Most national standards do limit the load variation to maximum of 25%.
#Anvil spring hanger catalog full
This full travel can be used providing the necessary calculations are carried out to ensure that the connecting equipment and pipework can withstand the large load changes that occur during pipe movement. The travels stated are the maximum working range of the springs. Standard ranges of variable spring supports are produced in four basic travel ranges 35mm, 70mm, 140mm and 210mm. For relatively small displacements (up to about 75mm) the variable spring support is recommended. which give rise to vertical displacements should be supported by a resilient device which will absorb/accommodate the movement. Pipework and/or vessels subject to temperature change or subsidence, etc. The piping must therefore be supported in a correspondingly elastic manner so to compensate slight vertical displacements in the piping, Spring components are used as supports. To prevent constraints in the system, thermal expansion in the piping and the other piping components must not be hindered. Dynamic supports support the pipe in vibrations, seismic, winds and even take loads in working conditions. There are different types of dynamic or flexible support.
0 kommentar(er)
