Buried polyurethane foamed insulating steel pipe has the advantage of thermal transmission pipeline. Heating system is an important part of public municipal system. According to the different requirements and uses of construction projects, there are many heating modes: low pressure steam heating, high pressure steam heating, low temperature water heating, high pressure water heating and waste heat heating.

目前普遍采用的是低温水供热，因为它比蒸汽可节约能源20％－30％。采暖系统是由引入管、导管、立支管及散热器、阀门、集气罐、膨胀水箱、除污器、减压器和平衡阀等组成。

At present, low-temperature water heating is widely used, because it can save 20-30% energy than steam. Heating system is composed of leading pipe, conduit, riser and radiator, valve, gas collecting tank, expansion water tank, decontaminator, pressure reducer and balance valve.

室外供热管道通常分为一次供热管道和二次供热管道，一次供热管道压力小于等于1.6MPa，热水温度不超过150℃,二次供热管道压力小于等于1.2MPa，热水温度不超过100℃。室外采暖管道安装包括直埋管道或架空管道工程。

Outdoor heating pipeline is usually divided into primary heating pipeline and secondary heating pipeline. The pressure of primary heating pipeline is less than or equal to 1.6 MPa, the temperature of hot water is not more than 150 degrees, the pressure of secondary heating pipeline is less than or equal to 1.2 MPa, and the temperature of hot water is not more than 100 degrees. Installation of outdoor heating pipeline includes direct buried pipeline or overhead pipeline engineering.

二、材料及机工具要求

II. Material and Tool Requirements

（1）管材：碳素钢管、无缝钢管。管材不得弯曲；锈蚀，无飞刺、重皮及凹凸不平现象。

(1) Pipe material: Carbon steel pipe, seamless steel pipe. Pipe should not be bent; rust, no spur, heavy skin and uneven phenomenon.

(2)管件：无偏扣、方扣、乱扣、断丝，不得有砂眼、裂纹和角度不准确现象。

(2) Pipe fittings: unbiased buckle, square buckle, random buckle, broken wire, no sand hole, crack and angle inaccuracy.

(3)阀门：规格型号和适用温度，压力符合设计要求。铸造规矩，无毛刺、无裂纹，开关灵活严密，丝扣无损伤，直度和角度正确，手轮无损伤。有出厂合格证，安装前应按有关规定进行强度、严密性试验。

(3) Valves: specifications, models and applicable temperature, pressure in line with the design requirements. Foundry rules, no burrs, no cracks, flexible and tight switch, no damage to the thread, straightness and angle is correct, no damage to the handwheel. The strength and tightness test shall be carried out before installation with the factory certificate.

(4)附属装置：减压器、疏水器、过滤器、补偿器、法兰等符合设计要求，应有产品合格证和说明书。

(4) Accessory devices: pressure reducers, traps, filters, compensators, flanges, etc. meet the design requirements, and should have product certificates and specifications.

(5)其他材料：型钢、圆钢、管卡子、螺栓、螺母、油、麻、垫、电气焊条等。选用时应符合设计要求。

(5) Other materials: section steel, round steel, pipe clips, bolts, nuts, oil, hemp, cushions, electric welding rods, etc. The selection should meet the design requirements.

(6)机具：砂轮锯、套丝机、台钻、电焊机、煨弯器等。

(6) Machinery: grinding wheel saw, wire sleeve machine, drill, welding machine, bender, etc.

(7)工具：压力案、台虎钳、电焊工具、管钳、手锤、手锯、活扳子等。

(7) Tools: pressure cases, bench vises, welding tools, pipe pliers, hammers, hand saws, flexible wrenches, etc.

(8)其他：钢卷尺、水平尺、线坠、粉笔、小线等。

(8) Others: steel tape, horizontal ruler, line drop, chalk, small line, etc.

三、室外管道安装：

3. Outdoor Pipeline Installation:

(1)安装直埋管道，必须在沟底找平夯实，沿管线铺设位置无杂物，沟宽及沟底标高尺寸复核无误。

(1) To install directly buried pipelines, it is necessary to leveling and tamping the bottom of the trench, laying the position along the pipeline without any debris, and checking the width of the trench and the elevation of the trench bottom.

(2)安装地沟内的干管，应在管沟砌完后、盖沟盖板前，安装好托吊卡架后进行。

(2) Installation of trunk pipes in trenches shall be carried out after the trenches have been built and before the cover plate of the trenches has been covered, after the support crane frame has been installed.

（3）安装架空的干管，应先搭好脚手架，稳装好管道支架后进行。

(3) Installation of overhead trunk pipes should be carried out after scaffolding and stable installation of pipeline brackets.

四、施工工艺流程及操作方法

4. Construction process and operation method

（1）直埋敷设保温管安装工艺流程

(1) Installation process of directly buried insulating pipe

放线定位          管道吊装         管道校正        焊接

Correction Welding of Lifting Pipeline for Placing Positioning Pipeline

焊口修复          探伤试验          水压试验

Hydraulic Pressure Test of Weld Repair and Flaw Detection Test

焊口防腐保温         补偿器安装          供热试运行

Trial Operation of Installation and Heating of Weld Joint Corrosion and Insulation Compensator

五、供热管道安装注意事项

5. Notices for Installation of Heating Pipeline

(1)管道下沟前，应检查沟底标高、沟宽尺寸是否符合设计要求，保温管应检查保温层是否有损伤，如局部有损伤时，应将损伤部位放在上面，并做好标记，便于统一修理；

(1) Before the pipeline goes down the ditch, the elevation of the ditch bottom and the width of the ditch should be checked to meet the design requirements. The insulating pipe should check whether the insulating layer is damaged or not. If there is local damage, the damaged part should be put on it and marked well to facilitate unified repair.

(2)管道应先在沟外进行分段焊接以减少固定焊口，每段长度一般在25－35m为宜。下管时沟内不得站人，采用机械或人工下管均应将管缓慢、平直地下入沟内，不得造成管道弯曲；

(2) Pipeline should be welded sectionally outside the groove to reduce fixed weld joints. The length of each section is generally 25-35m. No one should stand in the ditch when the pipe is laid down. When the pipe is laid down by mechanical or manual means, the pipe should be slowly and straight underground into the ditch, and the pipe should not be bent.

(3)沟内管道焊接，连接前必须清理管腔，找平找直，焊接处要挖出操作坑，其大小要便于焊接操作；

(3) Pipeline welding in ditches must be cleaned and straightened before joining, and operation pits should be excavated at the welding site, which is easy for welding operation.

(4)阀门、配件、补偿器支架等，应在施工前按施工要求预先放在沟边沿线，并在试压前安装完毕；

(4) Valves, fittings, compensator brackets, etc. shall be pre-positioned along the ditch edge in accordance with construction requirements before construction and installed before pressure test;

(5)管道水压试验，应符合设计要求和规范规定，办理隐检试压手续，待检验合格后把水泄净，冲洗管道；

(5) Pipeline water pressure test shall comply with the design requirements and specifications, go through the procedure of hidden inspection and pressure test, and after passing the inspection, drain the water and flush the pipeline;

(6)管道防腐，应预先集中处理，管道两端留出焊口的距离，焊门处的防腐在试压完后再处理； 聚氨酯发泡保温钢管由于聚氨酯硬质泡沫保温层紧密地粘结在钢管外皮，隔绝了空气和水的渗入，能起到良好的防腐作用。同时它的发泡孔都是闭合的，吸水性很小。高密度聚乙烯外壳、玻璃钢外壳均具有良好的防腐、绝缘和机械性能。因此，工作钢管外皮很难受到外界空气和水的侵蚀。只要管道内部水质处理好，据国外资料介绍，高温预制直埋保温管的使用寿命可达50年以上，比传统的地沟敷设、架空敷设使用寿命高占地少，施工快，有利环境保护。

(6) pipeline anticorrosion should be centralized in advance. The distance between the ends of the pipeline should be set aside, and the anticorrosion of the welded door should be retreated after the test pressure. The polyurethane foam insulation pipe is tightly bonded to the outer skin of the steel pipe because of the rigid polyurethane foam insulation layer, which can prevent the infiltration of air and water, and can play a good anti-corrosion role. At the same time, its foaming holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is very difficult to be eroded by the outside air and water. As long as the internal water quality of the pipeline is well treated, according to foreign information, the service life of the high temperature prefabricated directly buried insulation pipe can reach more than 50 years, which occupies less land and is faster than the traditional trench laying and overhead laying, and is conducive to environmental protection.

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