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♦Coating classes and design temperature ranges
| Coating class | A | B | C |
| Toplayer material | LDPE | MDPE/HDPE | PP |
| Design temperature range(°C) | -20 °C to +60 °C | -40 °C to +80 °C | -20 °C to +110 °C |
| Installation and transportation at temperatures below 0 °C can casuse mechanical damage. | |||
♦Minimum total coating thickness
|
P m kg/m |
Total coating thicknessa/mm | ||||||||
| Class A1b | Class A2c | Class A3d | Class B1b | Class B2c | Class B3d | Class C1b | Class C2c | Class C3 d | |
| P m ≤ 15 | 1.8 | 2.1 | 2.6 | 1.3 | 1.8 | 2.3 | 1.3 | 1.7 | 2.1 |
| 15 ＜P m ≤50 | 2.0 | 2.4 | 3.0 | 1.5 | 2.1 | 2.7 | 1.5 | 1.9 | 2.4 |
| 50 ＜P m ≤130 | 2.4 | 2.8 | 3.5 | 1.8 | 2.5 | 3.1 | 1.8 | 2.3 | 2.8 |
| 130 ＜ P m ≤300 | 2.6 | 3.2 | 3.9 | 2.2 | 2.8 | 3.5 | 2.2 | 2.5 | 3.2 |
| 300 ＜ P m | 3.2 | 3.8 | 4.7 | 2.5 | 3.3 | 4.2 | 2.5 | 3.0 | 3.8 |
|
a)The required total coasting thickness may be reduced by a maximun of 10% on the weld seam for SAW-welded pipes. b)Class 1 is for light duty(onshore sandy soli) c)Class 2 is for moderate duty (clay soils,absence of backfill). d) Class 3 is for heavy duty(rocky soil or offshore). |
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♦Requirements for the epoxy mateial
| Liquid mono-componenta or bi-component epoxe | |||||
| Properties | Unit | Test method | Requirements | ||
| Class A and Class B | Class C | ||||
| Density | g/l | ISO 2811(all parts) | Within ±0.05 of the manufacturer's specified nominal value | ||
| Solid content of base & hardener | % mass | ISO 3252 | In accordance with manufacturer's specification | ||
| Minimum glass transition temperature | °C | ISO 11357(all parts) | ≥ 95 and within manufacturer's specification | At least 5 above maximun pipeline design temperature with a minimun of 95 | |
| Gel time at 205°C ± 3°C | s | Manufacturer's specification | With the 20% of the nominal values specified by the manufacturer | ||
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