The outside diameter is from outside edge to outside edge across the pipe. To find it, measure around the circumference of the pipe with flexible measuring tape. Divide the circumference by pi, or about 3.14159.
1-1/2″ tubing has a true 1.50″ outside diameter.
|Nominal Pipe Size||Outside Diameter (inches)|
|Nominal Pipe Size||O.D.||Average I.D.|
In short: Tube is measured by outside diameter, pipe is measured by inside diameter. There is often confusion as to which size die the customer actually needs – Pipe Size or Tubing Size. Keep in mind that pipe size refers to a nominal – not actual – inside pipe diameter.
|NPS||Outside Diameter (in)||Weight (lb/ft)|
1.5″ PVC pipe sch 40 has a nominal inside diameter of 1.5″ and an outside diameter of 1-7/8″. Thus the socket for 1.5″ fittings is approximately 1-7/8″ in diameter.
The OD for 1/2″ PVC pipe is 0.840″ and the OD for 3″ PVC pipe is 3.500″.May 3, 2016
A vernier caliper is a high-precision measurement tool that can be used in multiple types of measurements. It can measure thickness, diameter and even inside diameter for pipes.
ID – ID stands for the inside diameter of the pipe: This is measured by looking at a cross-section of hollow pipe and measuring the distance between the interior edges. Schedule: The schedule of a pipe tells us its wall thickness. Thickness can be obtained by taking the difference between the OD and ID.
PVC Pipe is identified by the ID (Inside Diameter) and is referred to as a “nominal” size which means “in name only.” However this confuses people and most novices try to use the OD (Outer Diameter) to order parts.
|PVC and CPVC Pipes – Schedule 40|
|Nominal Pipe Size (inches)||Outside Diameter (inches)||Inside Diameter*) (inches)|
|Pipe Size||Decimal OD||Metric OD|
The pipes available in catalogues are listed as 32 mm or 40 mm. I understand that a nominal 32 mm plastic waste pipe has an outside diameter of 34.5 mm.
The OD of 1/2-inch galvanized pipe is about 7/8-inch and so is 1/2-inch PVC. 3/4-inch pipe measures 1-1/16 inches, 1-inch measures 1 5/16 inches and 1 1/4 inches measures 1 5/8 inches.
|Item #||Size||Outside Diameter|
|SCH 40 Pipe-1/4||1/4 in||0.540 in|
|SCH 40 Pipe-3/8||3/8 in||0.675 in|
|SCH 40 Pipe-1/2||1/2 in||0.840 in|
|SCH 40 Pipe-3/4||3/4 in||1.050 in|
|Nominal Pipe Size||Outside Diameter||Weight(lb/100 ft)|
|Size (in)||Inside Diameter of Hub (in)||Outside Diameter of Barrel (in)|
|Nominal Dia (in)||Actual ID (in)||Actual OD (in)|
|Nominal Pipe Size||Average Outside Diameter||Minimum Wall Thickness (in) And Calculated ID (in)|
|PIPE SCHEDULES WALL THICKNESS (Inches)|
|Nominal||O.D. Inches||80s & E.H.|
|Nominal Pipe Size inches||O.D.||I.D.|
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.
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