Here’s how to determine pipe size by simply measuring the OD. Copper. The nominal size of copper pipe, whether supply lines or DWV, is always 1/8 inch less than the OD measurement. For example, copper pipe that measures 5/8 inch OD, is called 1/2- inch pipe.
Standard Sink Supply Line Size
The copper, galvanized steel or PEX pipes that constitute a residential water supply system are of two main diameters. The main pipes, which are the ones that come off the main water supply and the water heater, are 3/4 inches in diameter.
|Nominal Pipe Size inches||O.D.||I.D.|
The nominal size of copper pipe is always smaller than the OD measurement. 1/2- inch pipe is the measurement of copper pipe that is 5/8 inch OD. The ID is affected by wall thickness.
Seamless Copper Pipe
Available sizes are 1/8″ to 12″ diameters in regular wall thickness and 1/8″ to 10″ in extra strong wall thickness. The standard length for copper pipe is 12 feet. Copper pipe is suitable for plumbing, boiler feed lines, refrigeration and for similar purposes.
Tubing is measured by the OUTSIDE DIAMETER (O.D.), specified in inches (e.g., 1.250) or fraction of an inch (eg. 1-1/4″). Pipe is usually measured by NOMINAL PIPE SIZE (NPS).
Copper was the plumbing pipe of choice from the 1950s until 2000 and was widely used both in new construction and to replace the galvanized steel water supply pipes that had been the standard into the 1950s. But copper’s use has gradually faded, due to the introduction of.
Tubing is usually more expensive than pipe due to tighter manufacturing tolerances. Interestingly, while the stated and measured OD’s of tubing are almost exact in most cases, copper tubing generally has a measured OD that is 1/8” larger than stated OD. As such, maybe it should be called copper pipe.
The actual outside diameter (OD) of rigid copper type is always 1/8 inch larger than the nominal size, or what the pipe is called. For example, a 1/2-inch copper pipe has an outside diameter of 5/8 inch.
The best known and most widely used connection where the pipe thread provides both the mechanical joint and the hydraulic seal is the American National Pipe Tapered Thread, or NPT. NPT has a tapered male and female thread which seals with Teflon tape or jointing compound.
The Pocket Rocket is a tool often useful to Engineers, Draftsmen, Pipe-fitters, Contractors, Carpenters, Plumbers, and related industries. This is a fractional measuring unit, which reads in inches. This Pocket Rocket can measure pipe sizes up to 16″ in diameter.
Copper Pipe Lifespan. PEX pipe is not only cheaper than copper but more durable too. PEX is immune to corrosion and mineral build-up, and it’s not affected by electrolysis, which can cause small pinhole leaks in copper piping. … PEX pipe is more resistant to bursting in freezing conditions than metal piping.
M/Red is lighter duty, generally used for hydronic heating. It is permitted by code for domestic in SOME areas. L/Blue is a medium grade, suitable for domestic or hydronic heating.
|Nominal Bore Size||Outside Diameter|
|1″||1.112″ / 28.24 mm|
|1-1/4″||1.362″ / 34.59 mm|
|1-1/2″||1.612″ / 40.94 mm|
|2″||2.218″ / 56.34 mm|
|PIPE SCHEDULES WALL THICKNESS (Inches)|
|Nominal||O.D. Inches||80s & E.H.|
No longer is copper piping the primary, or preferred, choice of most homeowners and plumbers. Cross-linked polyethylene flexible tubing—commonly called PEX—has grown in popularity for residential plumbing over the past few decades as an alternative to traditional copper and chlorinated polyvinyl chloride (CPVC) piping.
Potential chemical leaching is another downside of PEX piping. Due to its chemical composition, the PEX pipe material may leach toxic chemicals including bisphenol (BPA), MTBE, tertiary butyl alcohol (TBA), and others.
Simply get a powerful magnet and a screwdriver with a flat head. Find your water pipe line and scratch the pipe’s outer surface with the help of a screwdriver. If the scratched area has a silver-gray color and magnets sticks to it, it means that galvanized pipes are used in your plumbing system.
Once the dangers of copper pipes became better known, plumbers switched to brass pipes. However, research has highlighted problems with this option too. Brass products in plumbing systems can allow high levels of lead to leak into the drinking water. This is true even in brand new buildings.
Copper is also costlier.
In recent years, the cost of copper has risen substantially due to its increased recycle value, so products made from copper have increased as well. On average, installing copper water pipes will be 58 percent to 68 percent more expensive than PEX.
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