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EN10255 Pipe Classification: Light vs Medium vs Heavy
| CLASS | Nominal | Outside Diameter | Wall | Calculated Weight | Number Of Threads |
Socket | Test Pressure |
|||||||||
| Outer Diameter |
Min. Length |
|||||||||||||||
| Size | Maximum | Minimum | Thickness | Plain Ends | Threads and Coupling | |||||||||||
| mm | in | mm | mm | mm | kg/m | kg/ft | Ib/ft | kg/m | kg/ft | Ib/ft | per inch | mm | mm | Bar | Psi | |
|
LIGHT (L2) |
15 | 1/2 | 21.4 | 21.0 | 2.0 | 0.947 | 0.289 | 0.636 | 0.956 | 0.291 | 0.642 | 14 | 27.8 | 38.1 | 50 | 725 |
| 20 | 3/4 | 26.9 | 26.4 | 2.3 | 1.38 | 0.421 | 0.928 | 1.39 | 0.424 | 0.935 | 14 | 34.1 | 41.3 | 50 | 725 | |
| 25 | 1 | 33.8 | 33.2 | 2.6 | 1.98 | 0.604 | 1.33 | 2.00 | 0.61 | 1.34 | 11 | 42.1 | 47.6 | 50 | 725 | |
| 32 | 1 1/4 | 42.5 | 41.9 | 2.6 | 2.54 | 0.774 | 1.71 | 2.57 | 0.78 | 1.73 | 11 | 51.6 | 54.0 | 50 | 725 | |
| 40 | 1 1/2 | 48.4 | 47.8 | 2.9 | 3.23 | 0.985 | 2.17 | 3.27 | 1.00 | 2.20 | 11 | 57.9 | 57.2 | 50 | 725 | |
| 50 | 2 | 60.2 | 59.6 | 2.9 | 4.08 | 1.24 | 2.73 | 4.15 | 1.26 | 2.78 | 11 | 70.6 | 63.5 | 50 | 725 | |
| 65 | 2 1/2 | 76.0 | 75.2 | 3.2 | 5.71 | 1.74 | 3.83 | 5.83 | 1.78 | 3.92 | 11 | 87.3 | 69.9 | 50 | 725 | |
| 80 | 3 | 88.7 | 87.9 | 3.2 | 6.72 | 2.05 | 4.52 | 6.89 | 2.10 | 4.63 | 11 | 101.6 | 76.2 | 50 | 725 | |
| 100 | 4 | 113.9 | 113.0 | 3.6 | 9.75 | 2.97 | 6.55 | 10.00 | 3.05 | 6.72 | 11 | 128.6 | 88.9 | 50 | 725 | |
|
LIGHT (L1) |
15 | 1/2 | 21.7 | 21.0 | 2.3 | 1.080 | 0.329 | 0.726 | 1.090 | 0.332 | 0.732 | 14 | 27.8 | 38.1 | 50 | 725 |
| 20 | 3/4 | 27.1 | 26.4 | 2.3 | 1.39 | 0.424 | 0.934 | 1.40 | 0.427 | 0.941 | 14 | 34.1 | 41.3 | 50 | 725 | |
| 25 | 1 | 34.0 | 33.2 | 2.9 | 2.20 | 0.671 | 1.48 | 2.22 | 0.68 | 1.49 | 11 | 42.1 | 47.6 | 50 | 725 | |
| 32 | 1 1/4 | 42.5 | 41.9 | 2.9 | 2.82 | 0.860 | 1.89 | 2.85 | 0.87 | 1.92 | 11 | 51.6 | 54.0 | 50 | 725 | |
| 40 | 1 1/2 | 48.6 | 47.8 | 2.9 | 3.24 | 0.988 | 2.18 | 3.28 | 1.00 | 2.20 | 11 | 57.9 | 57.2 | 50 | 725 | |
| 50 | 2 | 60.7 | 59.6 | 3.2 | 4.49 | 1.37 | 3.02 | 4.56 | 1.39 | 3.06 | 11 | 70.6 | 63.5 | 50 | 725 | |
| 65 | 2 1/2 | 76.3 | 75.2 | 3.2 | 5.73 | 1.75 | 3.85 | 5.85 | 1.78 | 3.93 | 11 | 87.3 | 69.9 | 50 | 725 | |
| 80 | 3 | 89.4 | 87.9 | 3.6 | 7.55 | 2.30 | 5.07 | 7.72 | 2.35 | 5.19 | 11 | 101.6 | 76.2 | 50 | 725 | |
| 100 | 4 | 114.9 | 113.0 | 4.0 | 10.80 | 3.29 | 7.26 | 11.10 | 3.38 | 7.46 | 11 | 128.6 | 88.9 | 50 | 725 | |
|
MEDIUM (M) |
15 | 1/2 | 21.8 | 21.1 | 2.6 | 1.21 | 0.369 | 0.814 | 1.22 | 0.372 | 0.82 | 14 | 27.8 | 38.1 | 50 | 725 |
| 20 | 3/4 | 27.3 | 26.5 | 2.6 | 1.56 | 0.475 | 1.05 | 1.57 | 0.479 | 1.06 | 14 | 34.1 | 41.3 | 50 | 725 | |
| 25 | 1 | 34.2 | 33.3 | 3.2 | 2.41 | 0.735 | 1.62 | 2.43 | 0.741 | 1.63 | 11 | 42.1 | 47.6 | 50 | 725 | |
| 32 | 1 1/4 | 42.9 | 42.1 | 3.2 | 3.10 | 0.945 | 2.08 | 3.13 | 0.954 | 2.10 | 11 | 51.6 | 54.0 | 50 | 725 | |
| 40 | 1 1/2 | 48.8 | 47.9 | 3.2 | 3.56 | 1.09 | 2.40 | 3.60 | 1.10 | 2.42 | 11 | 57.9 | 57.2 | 50 | 725 | |
| 50 | 2 | 60.8 | 59.7 | 3.6 | 5.03 | 1.53 | 3.37 | 5.10 | 1.55 | 3.42 | 11 | 70.6 | 63.5 | 50 | 725 | |
| 65 | 2 1/2 | 76.6 | 75.3 | 3.6 | 6.42 | 1.96 | 4.32 | 6.54 | 1.99 | 4.39 | 11 | 87.3 | 69.9 | 50 | 725 | |
| 80 | 3 | 89.5 | 88.0 | 4.0 | 8.36 | 2.55 | 5.62 | 8.53 | 2.60 | 5.73 | 11 | 101.6 | 76.2 | 50 | 725 | |
| 100 | 4 | 115.0 | 113.1 | 4.5 | 12.2 | 3.72 | 8.2 | 12.5 | 3.81 | 8.40 | 11 | 128.6 | 88.9 | 50 | 725 | |
| 125 | 5 | 140.8 | 138.5 | 5.0 | 16.6 | 5.06 | 11.2 | 17.1 | 5.21 | 11.5 | 11 | 155.6 | 95.3 | 50 | 725 | |
| 150 | 6 | 166.5 | 163.9 | 5.0 | 19.8 | 6.04 | 13.3 | 20.4 | 6.22 | 13.7 | 11 | 184.2 | 95.3 | 50 | 725 | |
|
HEAVY (H) |
15 | 1/2 | 21.8 | 21.0 | 3.2 | 1.44 | 0.439 | 0.968 | 1.45 | 0.442 | 0.974 | 14 | 27.8 | 38.1 | 50 | 725 |
| 20 | 3/4 | 27.3 | 26.5 | 3.2 | 1.87 | 0.57 | 1.257 | 1.88 | 0.573 | 1.263 | 14 | 34.1 | 41.3 | 50 | 725 | |
| 25 | 1 | 34.2 | 33.3 | 4.0 | 2.93 | 0.896 | 1.98 | 2.95 | 0.899 | 1.98 | 11 | 42.1 | 47.6 | 50 | 725 | |
| 32 | 1 1/4 | 42.9 | 42.0 | 4.0 | 3.79 | 1.16 | 2.56 | 3.82 | 1.16 | 2.57 | 11 | 51.6 | 54.0 | 50 | 725 | |
| 40 | 1 1/2 | 48.8 | 47.9 | 4.0 | 4.37 | 1.33 | 2.95 | 4.41 | 1.34 | 2.96 | 11 | 57.9 | 57.2 | 50 | 725 | |
| 50 | 2 | 60.8 | 59.7 | 4.5 | 6.19 | 1.89 | 4.17 | 6.26 | 1.91 | 4.21 | 11 | 70.6 | 63.5 | 50 | 725 | |
| 65 | 2 1/2 | 76.6 | 75.3 | 4.5 | 7.93 | 2.42 | 5.34 | 8.05 | 2.45 | 5.41 | 11 | 87.3 | 69.9 | 50 | 725 | |
| 80 | 3 | 89.5 | 88.0 | 5.0 | 10.3 | 3.14 | 6.92 | 10.5 | 3.20 | 7.06 | 11 | 101.6 | 76.2 | 50 | 725 | |
| 100 | 4 | 115.0 | 113.1 | 5.4 | 14.5 | 4.42 | 9.71 | 14.8 | 4.51 | 9.95 | 11 | 128.6 | 88.9 | 50 | 725 | |
| 125 | 5 | 140.8 | 138.5 | 5.4 | 17.9 | 5.46 | 12.0 | 18.4 | 5.61 | 12.4 | 11 | 155.6 | 95.3 | 50 | 725 | |
| 150 | 6 | 166.5 | 163.9 | 5.4 | 21.3 | 6.49 | 14.3 | 21.9 | 6.68 | 14.7 | 11 | 184.2 | 95.3 | 50 | 725 | |
- Note: This Specification replaces BS1387:1985
Tolerance
| Wall thickness | Light (L1 & L2): -8% |
| Medium (M) and heavy (H): -10% | |
| Length | Plus minus 50mm or Plus 150 mm (Manufacturer Standard) |
| Mass | Plus 10% or minus 8% on individual tubes for types L1 and L2 |
Chemical Composition & Material Properties
| Classifcation | Specification | Mechanical Properties | Chemical Composition % |
Bend Test (N2) |
Flattening Test | |||||||||
| Tensile Strength Min. |
Yield Strength Min. |
Elongation Min. |
C Max |
Si Max |
Mn Max |
P Max |
S Max |
Bending Angle |
Bending Radius |
H | ||||
| N/mm² | N/mm² | % | ||||||||||||
| Welded SteelTubes-Light,Medium &Heavy |
BS EN 10255:2004 |
320 to 520 | 195 | 20(N3) | 0.20 | - | 1.20 | 0.045 | 0.045 | 180° | 6D | 3/5 D | ||
- H - Distance between the plates
- D - Outside diameter of the pipe
Manufacturing & Key Features
EN 10255 pipes are produced via ERW (Electric Resistance Welding) process. Steel strip is continuously formed into circular tube, seam welded, sized and cut into fixed lengths. Key product features:
1. Pipe End Options
- Plain ends: For on-site welding connection
- Threaded ends: BSP taper threads, compatible with standard pipe fittings
- Socketed ends: Factory pre-fitted sockets for quick threaded assembly
Standard length: 6 meters per piece; custom cut lengths available upon request.
Surface options: Black non-galvanized or hot-dip galvanized coating. Galvanized EN10255 pipe is more popular for water and gas pipelines for rust prevention.
👉 Read more: [What is the Difference Between EN10255 vs BS1387 HDG Steel Pipe? | Brisk Steel]
Typical Applications
- Potable water supply piping for residential and commercial buildings
- Low-pressure gas distribution networks
- Central heating circulation pipelines
- Fire water service lines for new European-spec construction
- General irrigation and building mechanical service piping
Frequently Asked Questions (FAQ)
Q: Can EN10255 replace BS1387 pipe directly?
A: In most new projects, EN10255 is the official replacement of BS1387. For renovation projects with existing BS1387 fittings, check wall thickness and BSP thread dimension carefully before substitution.
Q: What is the difference between Series1 and Series2 EN10255 pipe?
A: Series1 is heavy wall for higher working pressure; Series2 is light wall for low-pressure indoor piping. Series1 has thicker wall and higher cost than Series2.
Q: Is EN10255 pipe suitable for high-pressure industrial process piping?
A: No. EN10255 is designed for low to medium pressure building service. For high-pressure industrial fluid transportation, EN10217 pressure pipe should be selected instead.
Q: Does EN10255 pipe come with galvanized coating?
A: Yes, hot-dip galvanized is widely available. Black bare steel pipe is also offered for applications without corrosion concerns.
Brisk Steel supplies full-size EN10255 ERW steel pipe, black or hot-dip galvanized, with BSP threading and socket fabrication. Send your size, class and quantity requirements for latest quotation.
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