Thermal Linear Expansion of PVC and CPVC Pipe
時間：2016-07-09 10:39:35點擊：次
Thermal expansion and contraction is fairly common inmost piping materials. The coeficient of linear expansion or expansivity for PVC and CPVC pipe is the ratio of the change in pipe length per degree change in temperature.
Adjustments for Above-Ground Thermal Expansion and Contraction
When designing for the use of any expansion joint, it should be remembered that this joint is usually considered to be the weakest link in the entire piping system. The responsible project engineer should determine the system requirements and then evaluate the design feasibility of each type of joint. To get an dea of what is available, here are some of the more common variations of joints:Expansion Loop - A fairly simple but eficient method for growth control. Expansion loops generally contain no moving parts (o-ring seals or gaskets) and are easily fabricated from pipe and elbows. Their drawbacks are of f s e t space requirements and limitations on large diameter pipe.Flexible Bend - This type of joint (plastic or metallic) is available in many configurations. They absorb excessive vibration, allow multi-directional movement, and correct for mis-alignment or structural shift in the system. Negatives are pressure limitations and resistance to corrosive fluids in the case of 100% metallic bends.Plastic Piston Expansion Joint - Usually a fabricated device constructed by telescoping two pieces of pipe. They will allow for considerable movement in a linear direction only. For this reason, careful alignment is very necessary for smooth operation. The critical component in this device is the elastomeric oring seal, which must be evaluated for chemical and heat resistance as well as positive sealing characteristics during wear.
Bellows and Rubber Expansion Joints - of these joints will absorb growth in the system due to thermal changes and will allow for dynamic movements of machinery, support structures, and buildings. Rubber expansion joints will allow for axial, lateral, angular and torsional movement. Both types are installed in-line and are fairly compact. The manufacturer of each should be consulted to determine speciic design advantages and limitations.
Bellows and Rubber Expansion Joints - of these joints will absorb growth in the system due to thermal changes and will allow for dynamic movements of machinery, support structures, and buildings. Rubber expansion joints will allow for axial, lateral, angular and torsional movement. Both types are installed in-line and are fairly compact. The manufacturer of each should be consulted to determine speciic design advantages and limitations.
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