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RESOURCES > FAQS/TECHNICAL BRIEFS
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Air Valves: Improving the Performance of Pressure Pipelines
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Air valves automatically release or admit air during the filling, operation, or draining of a pipeline. For all pipe materials, efficient and safe pipeline operation is dependent on continuous removal of air from the line.
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Cold weather: no practical effect on pvc pipe installation and use
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Fifty years of field experience confirm that PVC pipe more than measures up to the rigors of cold-weather installation and use. In fact, an easy-to-use product like PVC pipe becomes even more advantageous as temperatures decrease. PVC is widely used in Canada, Minnesota, and the Dakotas, so cold weather is not a limiting factor for PVC pipe projects.
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Expansion Gaps for Gasketed PVC Pipe: Maximizing Joint Performance
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Video inspections of PVC sewer pipelines often reveal small longitudinal gaps between the spigot end and the bell shoulder of the gasketed joints. These gaps are not flaws. In fact, gaps are an important design consideration for both pressure and non-pressure PVC pipes.
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Gasketed PVC Pipe: The Importance of Insertion Lines
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The insertion line found on gasketed PVC pipe – marked around the pipe circumference near the spigot end – indicates the depth of insertion of the pipe spigot into the bell. The line is positioned by the pipe manufacturer based on bell design, allowances for manufacturing tolerances, and anticipated thermal expansion and contraction.
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PVC Pipe Excels in Deep Bury Applications
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Some engineers mistakenly contend that PVC pipe is not suitable for deep-bury projects. The concern is that the pipe will not hold up under large earth loads. However, installations throughout North America have shown otherwise and have demonstrated that PVC pipelines perform long-term at depths of more than 40 feet.
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PVC Pressure Pipe – Not Subject to Collapse from Fire-Flow Pumping
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Some pipeline designers mistakenly contend that PVC pipe must be DR18 or thicker to resist collapse due to vacuum caused by fire-flow conditions. This technical brief refutes that misconception.
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UV Exposure HAS No Practical Effects on PVC Pipe Performance
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Ultraviolet (UV) radiation from sunlight can affect the outermost surface of PVC pipe. However, even after prolonged exposure, there are no practical effect on PVC pipe’s performance characteristics...
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