Pvc Pipe Sizes
Ettie Wilkoff
In March 1927 the American Standards Association authorized a committee to standardize the dimensions of wrought steel and wrought iron pipe and tubing. At that time only a small selection of wall thicknesses were in use: standard weight (STD), extra-strong (XS), and double extra-strong (XXS), based on the iron pipe size (IPS) system of the day. However these three sizes did not fit all applications. Also, in 1939, it was hoped that the designations of STD, XS, and XXS would be phased out by schedule numbers, however those original terms are still in common use today (although sometimes referred to as standard, extra-heavy (XH), and double extra-heavy (XXH), respectively). Since the original schedules were created, there have been many revisions and additions to the tables of pipe sizes based on industry use and on standards from API, ASTM, and others.[3]
Stainless steel pipes, which were coming into more common use in the mid 20th century, permitted the use of thinner pipe walls with much less risk of failure due to corrosion. By 1949 thinner schedules 5S and 10S, which were based on the pressure requirements modified to the nearest BWG number, had been created, and other "S" sizes followed later. Due to their thin walls, the smaller "S" sizes can not be threaded together according to ASME code,[4] but must be fusion welded, brazed, roll grooved, or joined with press fittings.
Based on the NPS and schedule of a pipe,[5] 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 (360 mm) and a wall thickness of 0.437 inches (11.1 mm). However, the NPS and OD values are not always equal, which can create confusion.
When a pipe is welded or bent the most common method to inspect blockages, misalignment, ovality, and weld bead dimensional conformity is to pass a round ball through the pipe coil or circuit. If the inner pipe dimension is to be measured then the weld bead should be subtracted, if welding is applicable. Typically, the clearance tolerance for the ball must not exceed 1 millimetre (0.039 in). Allowable ovality of any pipe is measured on the inside dimension of the pipe, normally 5% to 10% ovality can be accepted. If no other test is conducted to verify ovality, or blockages, this test must be seen as a standard requirement. A flow test can not be used in lieu of a blockage or ball test. See pipe dimensional table, Specification ASME B36.10M or B36.19M for pipe dimensions per schedule.
Stainless steel pipe is most often available in standard weight sizes (noted by the S designation; for example, NPS Sch 10S). However stainless steel pipe can also be available in other schedules.
The steel pipe data chart below can be used to find pipe sizes, diameters, wall thickness, working pressures and more The chart is based on ASME/ANSI B 36.10 Welded and Seamless Wrought Steel Pipe and ASME/ANSI B36.19 Stainless Steel Pipe.
Regardless of schedule number, pipes of a particular size all have the same outside diameter (not withstanding manufacturing tolerances). As the schedule number increases, the wall thickness increases, and the actual bore is reduced. For example:
Pipe dimensions vary based on the schedule and material. There is quite a bit that goes into the dimensions, but you can use the table of contents if you want to skip all of that and jump directly to the pipe size charts.
Nominal Pipe Size (abbreviated NPS) is a North American standard for identifying pipe sizes. Technically, the NPS is non-dimensional and only roughly refers to the diameter of the pipe. However, from NPS 14 and above, the NPS value matches the outside diameter of the pipe. Nominal Pipe Sizes apply to all materials of pipe. When specific pipes are specified, the NPS, Schedule, and material are required.
Outside of North America, pipes are identified by Diametre Nominel (DN), which is a dimensionless value that roughly equates to the outside diameter of the pipe in mm. The DN dimensions must conform to ISO Standard 6708.
While the Nominal Pipe Size identifies the outside diameter of the pipe, more information is needed to identify specific pipes. A pipe's schedule is the thickness of the pipe wall, which directly affects the interior dimension and weight of the pipe. Wall thickness is important because it determines the amount of internal pressure that the pipe can withstand. The schedule number is roughly calculated as: Schedule = 1000 x (P/S) where P is the internal service pressure of the pipe (psig) and S is the ultimate tensile strength of the pipe material (psi).
In addition to the schedule numbers, you will often see Standard (STD), Extra Strong (XS), and Double Extra Strong (XXS). These were original terms used prior to the schedule system that was implemented in 1927. It was originally intended for these to be phased out, but they occasionally appear. Stainless Steel pipe schedules append an "S" to the end of the schedule number, for instance Schedule 40S.
The two most common schedule sizes seen in buildings are Schedule 40 and Schedule 80. However, some process piping, utility facilities, and civil piping may require higher schedule numbers depending on the pressures used.
On the other hand, tubes are structural members and are measured with an exact outside diameter. Tubing is measured by the exact outside diameter and the wall thickness (WT). The manufacturing tolerances are much tighter than in pipes.
Just a quick question about changing the pipe sizes when you have a long section showing the pipe network. There are a few pipes along the network that I will need to change however everytime I select them and then hit the swap parts icon, the command line tells me that the selected object is of the wrong type. Based on some of the previous posts of a similar nature I thought this was the way to go however Im now a bit unsure. Anyway if anyone can chip in their 2 cents that would be much appreciated.
Not sure why you are not able to swap your parts, however if you are just changing the sizes of the pipes you should be able to do this within the Pipe Properties dialog on the Part Properies tab under PART DATA>INNER PIPE DIAMETER.
I've tried going into the pipe properties bit and it allows me to change all the parameters above apart from the pipe diameter sizes. By default the factors like the Darcy Weisbach are all set to zero and all parameters above material cant be changed, the same goes for the inner pipe diameter bit at the very bottom of the part data section. I might try and call our support people and see if they can help us out. This is rather frustrating now. Thanks for all your help though guys.
I am trying to draw in 2in. pvc pipe, but the smallest size that autocad comes with is 3.6in. I have tried using the parts builder, but after I added the size and saved it, it's still not in the options for different pvc sizes. I've also tried using the US Imperial pipes htm. but the browser comes up blank. I dont want to change anything else than the size of the pipe.
To make additional pipe sizes it opens up drawing called AeccCircularPvcPipe_Metric. Then in the Special Toolbox that the drawing has I click on size parameters, BdyD1 and then change one of the existing sizes to what I need. Then I click save part family in the same toolbox, but it gives the warning that the hide part flag is checked. If I uncheck it, It checks itself again when I click save. It also gives the warning that it was unable to save to kml. due to file being read-only, but I have checked the file and it is open.
What is the difference between metal tubing and metal pipe? They are both round and have holes through them, but there is a big difference. Tubing is measured/specified by outside diameter, since it is intended to be used in structural applications. Pipe is measured/specified by inside diameter, since it is intended to carry gas/liquid inside it.
I am not able to change the pressure pipe size during a pressure pipe run (Civil 3d 2021.2). This is a must. I tried to detach the pipe run so this is possible but follow surface is no longer a command in the profile editing tools. Does anyone know a work around for this?
I need a reducer between the two. When I put a PI where I need the pipe size change so I can come back and change the size as described above it places an elbow. When I swap the pipe to the new size and change the part to a reducer it switches back to an elbow if you edit the profile.
The program adds a branch fitting with the correct size when two pipe runs intersect perpendicular. We need the program to add a reducer if two pipe runs intersect when no angle is present. This would be much better than having to go change every individual part and pipe when a pipe size change is needed.
Pressure pipe runs is a fine idea, but it needs a lot of work to correct bugs and add features where deficient. It is practically unusable for now and I advised all the users here at the water utility to keep using 2020 until further notice.
I go this to work a few weeks ago. If I recall correctly I drew everything in at the main pipe run pipe size. I broke the pipe where I wanted a reducer, disconnected it from the pipe on the other side of the reducer, slid the pipes apart and added the reducer, connected the pipes up to the reducer, then swapped parts on the pipe that needed it. Fortunately in my case we reduced to a 6-in pipe with hydrant at project limits so we can flush the new system. If it was a whole network of 6-in pipe I'd create a new run or network.
NOTE - the reducer has to go in attached to one of the pipes or it goes in oriented vertically, that is the openings for pipes at top and bottom (for me), if that makes sense. Also - you can't flip the reducer once it is attached - it comes in in the up station direction of the network alignment., small to large (IIRC). So you have to draw the pipe run from small to large, anticipating the reducer and pipe size change.
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