镇集中供热管网，石油输送管线，高寒地区输水管线及厂区工业管道工程，它具有高效保温、防水防腐和施工简便，不怕
植物根刺的优点，施工不需地沟敷设，能在0.6-1.2米冻土层内直埋，热损失比传统工艺可降低40%，使用寿命比其他绝热
防腐材料提高3-5倍以上，使用寿命可达30-50年。
Direct-buried prefabricated thermal insulation pipe is made by closely attach- ing the transm-
ission medium of steel pipe ,polyurethane hard foamed thermal insulation layer and HDPE outer casing This project is mainly used on urban central heating networks, petroleum transmission pipelines ,
water supply pipe- lines in high and cold areas and industrial pipeline projects in factory areas .
It has the advantages of highly effective thermal insulation,water resistance and corrosion resis－
tance and resistance to puncture by plant roots. Trench laying is not required during construct－
ion and it can be directly buried in the frozen earth layer 0.6to 1.2m deep。The amount of thermal
loss can be reduced by 40%as compared with the traditional process. Its service life can reach 30
to 50 years, which is 3to 5 times longer than other thermal insulat-ion and corrosion resistant materials.
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预制直埋热水保温管性能指标
| 项目 | 单位 | 技术指标 |
| 密度 | kg/m3 | ≥60（任意位置） |
| 导热系数 | kg/m3 | ≤0.033 |
| 径向压缩强度 | Mpa | ≥0.3 |
| 吸水率 | % | ≤10 |
| 闭孔率 | % | ≥88 |
| 使用温度 | ℃ | 140℃ |
预制直埋热水保温管规格型号
| 钢管规格 | 外套管规格 | 保温层厚度（mm) | 长度（m) |
| Ф60×3.0 | Ф125×2.5 | 30 | 6 |
| Ф76×3.0 | Ф140×3.0 | 29.5 | 6 |
| Ф89×4.0 | Ф160×3.0 | 32.5 | 6 |
| Ф114×4.0 | Ф200×3.2 | 39.8 | 6 |
| Ф140×4.5 | Ф225×3.5 | 39 | 6 |
| Ф165×4.5 | Ф250×3.9 | 38.6 | 6 |
| Ф219×6.0 | Ф315×4.9 | 43.1 | 12 |
| Ф273×6.0 | Ф365×5.6 | 40.4 | 12 |
| Ф325×7.0 | Ф420×7.0 | 40.5 | 12 |
| Ф377×7.0 | Ф500×7.8 | 53.7 | 12 |
| Ф426×7.0 | Ф550×8.8 | 53.2 | 12 |
| Ф478×7.0 | Ф600×8.8 | 52.2 | 12 |
| Ф529×8.0 | Ф655×9.8 | 53.2 | 12 |
| Ф630×8.0 | Ф760×11 | 53.9 | 12 |
| Ф720×9.0 | Ф850×12 | 53.0 | 12 |
| Ф820×10.0 | Ф960×13 | 57.0 | 12 |
| Ф920×10.0 | Ф1054×14 | 53.0 | 12 |
| Ф1020×12 | Ф1155×14 | 53.5 | 12 |
| Ф1220×12 | Ф1380×15 | 65.0 | 12 |
