Line Pipe OD, ID, Weight and ScheduleNPS stands for Nominal Pipe Size, which is basically the number that represents the pipe size. For instance, a pipe that measures six inches has a nominal pipe size of six inches. However, that is not definitive, as it still depends on the size of the pipe. For sizes NPS 14 and higher, NPS is the same as the OD or Outside Diameter. The concept is easier to understand when you have knowledge on how line pipe is manufactured. For NPS 1/8 to NPS 12 pipe, the outside diameter is fixed. This means that if there is any increase in wall thickness, it would be the ID or inside diameter that will decrease. In this case, the line pipe ID is equal (approximately) to the NPS. For sizes bigger than NPS 12, NPS stands for the actual OD of the line pipe. Any wall thickness variation will not affect NPS, just the ID or inside diameter. Pipe Schedule ChartTo understand the pipe schedule better, here is the Line Pipe OD, ID, Weight and Schedule Chart: Click Button for Full Size Chart Line Pipe OD, ID, Weight and Schedule Chart
Line Pipe OD, ID, Weight and Schedule Chart
Pipe Schedule DiscussionPipe schedule is the term the industry uses to describe the pipe’s thickness. ASME (American Society of Mechanical Engineers) has come up with the Schedule Number based on a modified version of Barlow’s wall thickness formula. It indicates the approximate value of the expression 1000 x P/S. The said formula is as follows: Schedule Number = P/S where P is the service pressure per square inch and S is the allowable stress per square inch 40 is probably the most well-known and most commonly used schedule. Schedule 40 is just a designator for pipe thickness. In layman’s term, schedule 40 pipe can handle a specific amount of pressure. For instance, the schedule number of steel pipe that has an allowable stress of 10,000 psi for 350 psig of working pressure would be computed this way: Schedule Number = (1,000)(350/10,000) The schedule number would be 35 or approximately 40. Pipe Schedule Chart Abbreviations:
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