Tiếng Việt
ភាសាខ្មែរSeamless steel pipe and the meaning of the standards
On each type of steel pipe, there will be technical standards and symbols, with Tiger Steel learn the parameters and symbols as follows.
DN: is the nominal diameter.
For example DN15 or 15A, equivalent to pipe of nominal outside diameter
However, pipes manufactured to different standards will have different actual external diameters
Many people often mistakenly think that the DN15 tube is a 15mm non-tube. When we have the actual outside diameter, we only need to subtract 2 from the outer diameter
Inner diameter (mm) = Outer diameter (mm) 2x thickness (mm)
* Phi: nominal outside diameter.
In Vietnam, the most familiar unit for measuring pipe diameter is still phi (Ø), ie mm (shown above, for each production standard, the pipe will also have outside diameters. Both manufacturers publish their own production standards, and for each type of pipe.
* Inch (“):
A commonly used unit is the Inch (abbreviated symbol).
Many people will be confused in the conversion from Inch to DN or phi
This easy to confuse, perhaps will be overcome by the conversion table, and specific parameters
Table of nominal pipe sizes
This table corresponds to some standards such as: ASTM A106, A53, API 5L, A312, ASME …
Pipe from ⅛ ”to 3½” (from DN6 – DN90)
| Inch | DN | Outer diameter (mm) | Pipe wall thickness | |||
| SCH 5 | SCH 10 | SCH 30 | SCH 40 | |||
| ⅛ | 6 | 10,29 mm | 0,889 mm | 1,245 mm | 1,448 mm | 1,727 mm |
| ¼ | 8 | 13,72 mm | 1,245 mm | 1,651 mm | 1,854 mm | 2,235 mm |
| ⅜ | 10 | 17,15 mm | 1,245 mm | 1,651 mm | 1,854 mm | 2,311 mm |
| ½ | 15 | 21,34 mm | 1,651 mm | 2,108 mm | — | 2,769 mm |
| ¾ | 20 | 26,67 mm | 1,651 mm | 2,108 mm | — | 2,870 mm |
| 1 | 25 | 33,40 mm | 1,651 mm | 2,769 mm | — | 3,378 mm |
| 1¼ | 32 | 42,16 mm | 1,651 mm | 2,769 mm | 2,972 mm | 3,556 mm |
| 1½ | 40 | 48,26 mm | 1,651 mm | 2,769 mm | 3,175 mm | 3,683 mm |
| 2 | 50 | 60,33 mm | 1,651 mm | 2,769 mm | 3,175 mm | 3,912 mm |
| 2½ | 65 | 73,03 mm | 2,108 mm | 3,048 mm | 4,775 mm | 5,156 mm |
| 3 | 80 | 88,90 mm | 2,108 mm | 3,048 mm | 4,775 mm | 5,486 mm |
| 3½ | 90 | 101,60 mm | 2,108 mm | 3,048 mm | 4,775 mm | 5,740 mm |
Pipe from 4 ″ to 8 ″ (from DN100 – DN200)
| Inch | DNmm | Outer diameter (mm) | ||||
| SCH 5 | SCH 10 | SCH 20 | SCH 30 | |||
| 4 | 100 | 114,30 mm | 2,108 mm | 3,048 mm | — | 4,775 mm |
| 4½ | 115 | 127,00 mm | — | — | — | — |
| 5 | 125 | 141,30 mm | 2,769 mm | 3,404 mm | — | — |
| 6 | 150 | 168,28 mm | 2,769 mm | 3,404 mm | — | — |
| 8 | 200 | 219,08 mm | 2,769 mm | 3,759 mm | 6,350 mm | 7,036 mm |
Tube from 10 ″ to 24 ″ (from DN250 – DN600)
| Inch | DNmm | Outer DK (mm) | Pipe wall thickness (mm) | |||
| SCH 5s | SCH 5 | SCH 10s | SCH 10 | |||
| 10 | 250 | 273,05 mm | 3,404 mm | 3,404 mm | 4,191 mm | 4,191 mm |
| 12 | 300 | 323,85 mm | 3,962 mm | 4,191 mm | 4,572 mm | 4,572 mm |
| 14 | 350 | 355,60 mm | 3,962 mm | 3,962 mm | 4,775 mm | 6,350 mm |
| 16 | 400 | 406,40 mm | 4,191 mm | 4,191 mm | 4,775 mm | 6,350 mm |
| 18 | 450 | 457,20 mm | 4,191 mm | 4,191 mm | 4,775 mm | 6,350 mm |
| 20 | 500 | 508,00 mm | 4,775 mm | 4,775 mm | 5,537 mm | 6,350 mm |
| 24 | 600 | 609,60 mm | 5,537 mm | 5,537 mm | 6,350 mm | 6,350 mm |
| Inch | Pipe wall thickness (mm) | |||||
| SCH 40s | SCH 40 | SCH 60 | SCH 80s | SCH 80 | SCH 100 | |
| 10 | 9,271 mm | 9,271 mm | 12,700 mm | 12,700 mm | 15,062 mm | 18,237 mm |
| 12 | 9,525 mm | 10,312 mm | 12,700 mm | 12,700 mm | 17,450 mm | 21,412 mm |
| 14 | 9,525 mm | 11,100 mm | 15,062 mm | 12,700 mm | 19,050 mm | 23,800 mm |
| 16 | 9,525 mm | 12,700 mm | 16,662 mm | 12,700 mm | 21,412 mm | 26,187 mm |
| 18 | 9,525 mm | 14,275 mm | 19,050 mm | 12,700 mm | 23,800 mm | 29,362 mm |
| 20 | 9,525 mm | 15,062 mm | 20,625 mm | 12,700 mm | 26,187 mm | 32,512 mm |
| 24 | 9,525 mm | 17,450 mm | 24,587 mm | 12,700 mm | 30,937 mm | 38,887 mm |
| (mm) | ||
| SCH 80 | SCH 120 | XXS |
| 2,413 mm | — | — |
| 3,023 mm | — | — |
| 3,200 mm | — | — |
| 3,734 mm | — | 7,468 mm |
| 3,912 mm | — | 7,823 mm |
| 4,547 mm | — | 9,093 mm |
| 4,851 mm | — | 9,703 mm |
| 5,080 mm | — | 10,160 mm |
| 5,537 mm | 6,350 mm | 11,074 mm |
| 7,010 mm | 7,620 mm | 14,021 mm |
| 7,620 mm | 8,890 mm | 15,240 mm |
| 8,077 mm | — | 16,154 mm |
| Pipe wall thickness (mm) | ||||||
| SCH 40STD | SCH 60 | SCH 80 | SCH 100 | SCH 120 | SCH 140 | SCH 160 |
| 6,020 mm | 7,137 mm | 8,560 mm | — | 11,100 mm | — | 13,487 mm |
| 6,274 mm | — | 9,017 mm | — | — | — | — |
| 6,553 mm | — | 9,525 mm | — | 12,700 mm | — | 15,875 mm |
| 7,112 mm | — | 10,973 mm | — | 14,275 mm | — | 18,263 mm |
| 8,179 mm | 10,312 mm | 12,700 mm | 15,062 mm | 18,237 mm | 20,625 mm | 23,012 mm |
| SCH 20 | SCH 30 | |
| 6,350 mm | 7,798 mm | |
| 6,350 mm | 8,382 mm | |
| 7,925 mm | 9,525 mm | |
| 7,925 mm | 9,525 mm | |
| 7,925 mm | 11,100 mm | |
| 9,525 mm | 12,700 mm | |
| 9,525 mm | 14,275 mm | |
| SCH 120 | SCH 140 | SCH 160 |
| 21,412 mm | 25,400 mm | 28,575 mm |
| 25,400 mm | 28,575 mm | 33,325 mm |
| 27,762 mm | 31,750 mm | 35,712 mm |
| 30,937 mm | 36,500 mm | 40,462 mm |
| 34,925 mm | 39,675 mm | 45,237 mm |
| 38,100 mm | 44,450 mm | 49,987 mm |
| 46,025 mm | 52,375 mm | 59,512 mm |
See more about Hoa Phat galvanized steel pipe
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Email: tigersteel.vn@gmail.com
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