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In the USCS units, steel pipe is designated by the term nominal pipe size (NPS). Thus, a 10-inch nominal pipe size is referred to as NPS 10 pipe, and it has an actual outside diameter of 10.75 in. If the wall thickness is 0.250 in., the inside diameter is 10.25 in. Similarly, NPS 12 pipe has an outside diameter of 12.75 in.
Nominal pipe size (NPS) is used to describe a pipe by name only. It is essentially a “reference” size and does not translate to an exact diameter measurement of pipe 12″ and smaller. In process piping the term nominal simply refers to the name of the pipe, much like a 2″ × 4″ piece of lumber. A 2″ × 4″ board does not actually ...
3.1.2 Pipe diameter. ASME Piping Code: The pipe diameter is identified by a dimensionless number called “nominal pipe size” or nominal diameter expressed in “nominal inches,” for example, NPS ½, ¾, 1, 11 / 4, 1 1 / 2, 2, 3, and 4 nominal inches. There is no direct correlation between the NPS and the actual pipe OD up to and including ...
The inside diameter of the casing determines the wall thickness or vice versa. Rather than a specific tolerance for the amount at which the internal diameter might exceed a nominal value, the tolerance specified by API and ISO is given in terms of minimum wall thickness. The minimum wall thickness is 87.5% of the nominal wall thickness.
Pitch, denoted by p, is the distance, parallel to the screw axis, between corresponding points on adjacent thread forms having uniform spacing. Major diameter, denoted by d, is the largest (outside) diameter of a screw thread. Minor diameter, denoted by dr or d1, is the smallest diameter of a screw thread. Pitch diameter, denoted by dm or d 2 ...
Replacement criteria related to rope diameter * Six and eight strand ropes: Replacement necessary when the rope diameter is reduced to 90% of the nominal diameter at any position. Multi-strand ropes: A more detailed rope examination is necessary when the rope diameter is either reduced to 97%, or has increased to 105%, of the nominal diameter. *
As can be seen in Table 5.5, pitch, cut width, helical thickness, outer diameter and number of helical cut turns were kept constant at 5.478 mm, 2.5 mm, 2.978 mm, 10.95 mm and 2 turns respectively, while hole diameter was changed between 2.0 mm and 6.0 mm. Radial thickness changed depending on the hole diameter.
Pitch is the axial distance from the crest of one thread to its neighbor. Common units are length (i.e., the thread pitch is .) or number of threads per a specified length (i.e., threads per inch (TPI)). •. Lead is the axial distance the thread travels in one complete rotation of the pin relative to the coupling/box.
Aperture Size is perhaps the one item that may occasionally be adjusted to suit the user’s taste, but generally keep it the same size or slightly larger than the AutoSnap marker. If the aperture is too big, it may be distracting or may be confused with small rectangles on the screen. View chapter Explore book.
Pitch, denoted by p, is the distance, parallel to the screw axis, between corresponding points on adjacent thread forms having uniform spacing. Major diameter, denoted by d, is the largest (outside) diameter of a screw thread. Minor diameter, denoted by dr or d1, is the smallest diameter of a screw thread. Pitch diameter, denoted by dm or d 2 ...