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That would depend on the wall thickness of the pipe. 54 inches is the outside diameter so subtract the pipe wall thickness (x2) adn you have the inside diameter.
wall thickness of pipe is (OD - ID) /2
Based on the NPS and schedule of a pipe, the pipe outside diameter (OD) and wall thickness can be obtained from reference tables such as those below, which are based on ASME standards B36.10M and B36.19M. For example, NPS 14 Sch 40 has an OD of 14 inches and a wall thickness of 0.437 inches. However the NPS and OD values are not always equal, which can create confusion.For NPS â…› to 12 inches, the NPS and OD values are different. For example, the OD of an NPS 12 pipe is actually 12.75 inches. To find the actual OD for each NPS value, refer to the tables below. (Note that for tubing, the size is always the actual OD.)For NPS 14 inches and up, the NPS and OD values are equal. In other words, an NPS 14 pipe is actually 14 inches OD.The reason for the discrepancy for NPS â…› to 12 inches is that these NPS values were originally set to give the same insidediameter (ID) based on wall thicknesses standard at the time. However, as the set of available wall thicknesses evolved, the ID changed and NPS became only indirectly related to ID and OD.For a given NPS, the OD stays fixed and the wall thickness increases with schedule. For a given schedule, the OD increases with NPS while the wall thickness stays constant or increases. Using equations and rules in ASME B31.3 Process Piping, it can be shown that pressure rating decreases with increasing NPS and constant schedule.[note 1]
A juice box has a length of 3 inches, width of 1 inch and height of 4 inches. What is the total outside surface area of the juice box? Also how many cubic inches of juice can it contain if the wall thickness of the box is negligible and juice is filled only to 7/8 of the height?
-- Subtract the inside diameter from the outside diameter. -- Take half of the result. (since the outside diameter counts both walls of the pipe, and you want only one wall) Now you have the wall thickness. Common example. 1/2" OD, 3/8 " plastic tubing 1/2-3/8=1/8 and now divide by 2 and the wall thickness is 1/16"