对准埋地管道电化学腐蚀的三个进程，聚氨酯保温钢管的防腐办法也从克制其间某一进程下手。故防腐涂层与阴极维护相结合才是表本兼治的办法，经济而有用。因为在输出电流进程中遭受损坏，镁合金阳极的描绘运用年限更棒与管道的运用年限相匹配，既不发作铺张也不多添加维护费用。
In view of the three processes of electrochemical corrosion of buried pipelines, the anticorrosion method of polyurethane insulated steel pipes should also start from restraining one of them. Therefore, the combination of anti-corrosion coating and cathode maintenance is an economical and useful method. Because it is damaged in the process of output current, the service life of the magnesium alloy anode is best matched with the service life of the pipeline, which is neither extravagant nor expensive.
不一样的防腐办法有不一样的防腐质量和费用，应根据被维护聚氨酯保温钢管的不一样压力、不一样用处及其所在的不一样环境和运送的不一样燃气，归纳全部地思考防腐办法和防腐费用。当扁平量添加到50毫米时，裂缝逐步添加到边部全管段，试验成果，管径1%的扁平量时发作"发状"裂缝，当扁平量为6-9%的场合，沙浆涂层开端崩裂，到达管径30%时脱落。这在施工中是决不允许发作的。
Different anti-corrosion methods have different anticorrosion quality and cost. The anticorrosion method and cost should be considered according to the different pressure, different use, different environment and different gas transported. When the flattening amount is 50 mm, the cracks are gradually added to the whole pipe section at the edge. According to the test results, when the flattening amount is 1% of the pipe diameter, the "hairy" cracks occur. When the flattening amount is 6-9%, the mortar coating begins to crack and falls off when reaching 30% of the pipe diameter. This is not allowed to happen in construction.
聚氨酯保温钢管在受外压变形变扁平常，砂浆会发作"发状"裂缝，但要砂浆从管壁上剥离却是十分艰难的，在口径DN800毫米壁厚为7.1毫米的钢管上，截取一米长的管段，涂衬11毫米厚的砂浆涂层，当扁平量7-8毫米时，可以看到"发状"裂缝的呈现。据测定，在DN1100管子上，更小扁平量为15毫米，DN1800管上为21毫米。由此可见，管径的增大，发作裂缝的扁平量也随之增大。水泥沙浆面料有以下几个显着的长处：避免管道内壁腐蚀锈垢的发作，使管道长期保持杰出的输水状况，摩阻系数小。
It is common for polyurethane thermal insulation steel pipe to deform and flatten under external pressure. However, it is very difficult to peel the mortar from the pipe wall. On the steel pipe with diameter of DN800 mm and wall thickness of 7.1 mm, one meter long pipe section is cut off and coated with 11 mm thick mortar coating. When the flattening amount is 7-8 mm, hairy cracks can be seen. According to the measurement, the minimum flattening is 15 mm on the pipe of DN 100 and 21 mm on the pipe of DN 1800. It can be seen that with the increase of pipe diameter, the flattening amount of cracks will also increase. The cement mortar fabric has the following obvious advantages: it can avoid the corrosion and scale on the inner wall of the pipeline, keep the pipeline in excellent water delivery condition for a long time, and the friction coefficient is small.
水泥砂浆的施工有两种办法。一是地上离心法。首要适同于DN400口径以下的管道内衬施工。而是地下喷涂法，首要适用于DN700口径以上的管道在地下防腐施工。因为面料涂层的阻隔，水体不与金属管道触摸，包管了水质。
There are two ways to construct cement mortar. One is centrifugation on the ground. It is suitable for lining construction of pipes with diameter below dn400. It is the underground spraying method, which is mainly applicable to the underground anti-corrosion construction of pipes with diameter above DN700. Because of the barrier of the fabric coating, the water does not touch the metal pipe, which guarantees the water quality.
管道内壁由水泥砂浆的防腐，避免了腐蚀穿孔，延长了管道运用寿命，水泥沙浆涂层的资料选材便利，施工周期短，防腐作用好，下降管道工程的本钱。鉴于水泥砂浆具有上述长处，其防腐的功用和经济性，被越来越多的国内外的工程技术部门认可，国内大中城市都推行运用水泥砂浆作为给水金属管道内防腐的首要受点。也为此拟定了水泥砂浆面料的标准和质量标准。
The inner wall of the pipeline is anticorrosive by cement mortar, which avoids the corrosion perforation and prolongs the service life of the pipeline. The material selection of the cement mortar coating is convenient, the construction period is short, the anti-corrosion effect is good, and the cost of the pipeline project is reduced. In view of the above advantages of cement mortar, its anti-corrosion function and economy are recognized by more and more engineering and technical departments at home and abroad. Domestic large and medium-sized cities promote the use of cement mortar as the primary receiving point of internal corrosion protection of water supply metal pipes. The state has also formulated the standard and quality standard of cement mortar fabric.
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