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Hot tapping, [1] [2] or pressure tapping, is the method of making a connection to existing piping or pressure vessels without the interrupting or emptying of that section of pipe or vessel. This means that a pipe or tank can continue to be in operation whilst maintenance or modifications are being done to it.
Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...
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Because of meanders and thermal and seismic accommodations, the amount of 48-inch-diameter (1,200 mm) welded steel pipeline between the pipe stations and the end of the line is 800.3 miles (1,288.0 km), while the linear distance between the Prudhoe Bay and Valdez station endpoints is 639.34 miles (1,028.92 km). [152]
Generally the head losses (potential differences) at each node are neglected, and a solution is sought for the steady-state flows on the network, taking into account the pipe specifications (lengths and diameters), pipe friction properties and known flow rates or head losses. The steady-state flows on the network must satisfy two conditions:
As one of the most widely used rehabilitation methods, CIPP has applications in sewer, water, gas, chemical and district heating pipelines ranging in diameter from 0.1 to 2.8 meters (2–110 inches). The process of CIPP involves inserting and running a felt lining into a preexisting pipe that is the subject of repair.
(After the June 2010 spill of more than 800,000 US gallons (3,000 m 3) of crude oil into a tributary of the Kalamazoo River, an Enbridge tar sands pipeline—a 30-inch (760 mm) pipe compared to the 36-inch (910 mm) Keystone XL—was not completely shut down for 12 hours.)"
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