Pipe dimension is as per Nominal Pipe Size (NPS). This is a standard set up in the mid 1900’s based upon different “schedules”. The term schedule refers to the wall thickness of the pipe, the higher the schedule number ,the thicker the wall of the pipe. All pipe schedules of a given size have the same OD dimension.
Online InquiryPiping
Pipe dimension is as per Nominal Pipe Size (NPS). This is a standard set up in the mid 1900’s based upon different “schedules”. The term schedule refers to the wall thickness of the pipe, the higher the schedule number ,the thicker the wall of the pipe. All pipe schedules of a given size have the same OD dimension.
The table below shows the dimensions of common pipe sizes in different schedules.
| Size | OD Inches | ID Inches | ||||
| SCH 5 | SCH 10 | SCH 40 | SCH 80 | SCH 160 | ||
| 1/2″ | .84″ | 0.71″ | .92″ | .622″ | .546″ | 0.464″ |
| 3/4″ | 1.05″ | .920″ | .884″ | .828″ | .742″ | 0.612″ |
| 1″ | 1.315″ | 1.185″ | 1.097″ | 1.049″ | .957″ | .815″ |
| 1 1/2″ | 1.9″ | 1.77″ | 1.682″ | 1.610″ | 1.50″ | 1.338″ |
| 2″ | 2.375″ | 2.245″ | 2.157″ | 2.067″ | 1.939″ | 1.687″ |
| 3″ | 3.5″ | 3.334″ | 3.760″ | 3.068″ | 2.901″ | 2.624″ |
| 4″ | 4.5″ | 4.334″ | 4.26″ | 4.026″ | 3.726″ | 3.438″ |
Tubing
Tubing makes more sense. Almost all sanitary tubing and fittings are measured in tube size. How do you measure tube size? Simple, measure the outside diameter of the tube and you have the size. One inch tubing measures one inch on the outside diameter, two inch measures two inch, etc. Tubing is offered in a variety of wall thickness.
| Size | OD Inches | THICKNESS FOR DIFFERENT STANDARD | ||||
| 3A | SMS | SMS-2 | AS | |||
| 1/2″ | 1/2″ | 1.65 | 1.25 | 1.50 | 1.60 | |
| 3/4″ | 3/4″ | 1.65 | 1.25 | 1.50 | 1.60 | |
| 1″ | 1″ | 1.65 | 1.25 | 1.50 | 1.60 | |
| 1 1/2″ | 1 1/2″ | 1.65 | 1.25 | 1.50 | 1.60 | |
| 2″ | 2″ | 1.65 | 1.25 | 1.50 | 1.60 | |
| 3″ | 3″ | 1.65 | 1.60 | 2.0 | 1.60 | |
| 4″ | 4″ | 2.1 | 2.0 | 2.0 | 2.0 | |
Physical parameters
| Applied standard for product | ||
| For application | Domestic GB standard | USA. Standard |
| Heat exchanger pipe | GB151 | ASTM |
| HG20537.2 | A249 | |
| DL/T 712-2000 | A450 | |
| For transporting liquid | GB12771 | ASTM |
| HG20537.3 | A312 | |
| A530 | ||
| A450 | ||
| Water-heating | ASTM A688 | |
Physical machinery property
| Grade | Tensile strength σb Mpa | Tield strength δ0.2 Mpa | Elongation δ % | Elastic Die Gpa | Density 20℃ g/cm3 |
| 304 | ≥515 | ≥205 | ≥35 | 193 | 7.93 |
| 304L | ≥485 | ≥170 | ≥35 | 193 | 7.93 |
| 316 | ≥515 | ≥205 | ≥35 | 193 | 7.98 |
| 316L | ≥485 | ≥170 | ≥35 | 193 | 7.98 |
Tolerance table
| Item | Outside diameter | Wall thickness | Length 6000mm | Straightness |
| 19.05 | ±0.1-0.25 | ±0.5% | ±5 | ≤ 2/1000 |
| 25.4 | ±0.1-0.25 | ±0.5% | ±5 | ≤ 2/1000 |
| 38.1 | ±0.1-0.25 | ±0.5% | ±5 | ≤ 2/1000 |
| 50.8 | ±0.1-0.25 | ±0.5% | ±5 | ≤ 2/1000 |
| 63.5 | ±0.2-0.3 | ±0.5% | ±5 | ≤ 2/1000 |
| 76.2 | ±0.2-0.3 | ±0.5% | ±5 | ≤ 2/1000 |
| 101.6 | ±0.3-0.55 | ±0.5% | ±5 | ≤ 2/1000 |