How do you classify a pipe?

How do you classify a pipe?

Pipes are classified according to their schedule and nominal diameter. Pipe is normally ordered in accordance with the Nominal Pipe Size (NPS) standard, with a nominal diameter (pipe size) and schedule number specified (wall thickness). The NPS table below shows how many inches of pipe are required to bore a hole of a given diameter.

The NPS classification system was developed by the American Petroleum Institute (API) as a means of standardizing the description of oil-country tubular goods for the convenience of the trade. Pipes are usually marked with their NPS designation, which is also known as their 'type.' For example, '5/8 inch NPS F' indicates that the pipe is 5/8 inch in diameter and has a Schedule "F" wall thickness. There are several different types of pipes within each schedule category. A list of common pipe types along with their corresponding NPS designations can be found below:

Schedule 1 - Thickest walled pipe with lowest tolerance. Typically used for tanks, ponds, and other structures where maximum strength is important.

Schedule 2 - Thinnest walled pipe with moderate tolerance. Used for foundation walls, footings, and similar projects where weight is not a concern.

Schedule 3 - Thickest walled pipe with highest tolerance.

How do you determine the size of a pipe?

Sizes up to 12 inches NPS have an outer diameter that is somewhat bigger than the listed nominal size. Sizes 14-inch NPS and bigger have an outer diameter equal to the indicated nominal size. The thickness of a pipe's wall is indicated by its schedule number, with 5 being the thinnest and 160 being the thickest. Schedule numbers range from 1 to 6, with 4 and 5 being most common.

The length of a pipe is shown by its ID or nominal diameter. Pipes for water service should be between 9 and 12 inches in diameter, while pipes for sewer service are usually larger, ranging from 16 to 24 inches. Pipe sizes are designated by ID or nominal diameter. The ID of a pipe is the largest dimension of its cross section; it determines how much pressure can be carried before it becomes too large to fit through a given opening.

For example, if you were to measure the inside diameter of your home's water supply line, it would be less than 2 inches smaller than the outside diameter of the pipe. That means the water supply line can handle 40 pounds per square inch (psi), while the actual inside diameter of the pipe is only 36 inches.

You should also check the thickness of the walls of the pipe. A typical residential water supply line is made out of steel, which has a thickness of about 0.5 inch. The pipe will usually have two numbers on it: one above where it enters your house and another above where it leaves.

What is the pipe class and schedule?

The term "schedule" PVC pipe refers to an earlier method of marking pipe that is based on the standard specifications of ductile iron and steel pipe, i.e. the thickness of the pipe walls. Schedule 40 pipe adheres to the former "standard" piping designation and is deemed the same up to a diameter of 10 inches. The labeling scheme for "Class" pipes is different. Class 50 PVC pipe has half the wall thickness of Class 60 pipe; therefore, it can carry two times as much fluid. Class 100 PVC pipe is twice as thick as Class 200 pipe; therefore, it can carry four times as much fluid.

Pipe manufacturers divide their product lines by class and type. For example, one manufacturer may produce only single-wall pipe while another produces only double-wall pipe. Pipe classes are labeled according to certain characteristics of the metal used to make them. For example, all double-wall pipe is not created equal - some are heavier than others. Heavy duty double-wall pipe is used in construction projects that require extreme durability and strength. Light weight double-wall pipe is used in applications where cost is important too. Single-wall pipe is also called conduit because it is typically 1/2 inch or 3/4 inch in diameter and made from aluminum or polyvinyl chloride (PVC). Conduit is flexible and can be easily bent into shapes suitable for creating water systems networks. It is also lightweight and durable, making it perfect for use with low-pressure systems.

Single-wall plastic pipe is available in various sizes and wall thicknesses.

About Article Author

Darnell Sellers

Darnell Sellers is a man of many interests. He loves to work with his hands, and has a background in engineering. Darnell likes to drive around in his car, looking for trouble so he can fix it. He also enjoys working on motorcycles with his friends during the summertime.

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