對(duì)準(zhǔn)埋地管道電化學(xué)腐蝕的三個(gè)進(jìn)程，聚氨酯保溫鋼管的防腐辦法也從克制其間某一進(jìn)程下手。故防腐涂層與陰極維護(hù)相結(jié)合才是表本兼治的辦法，經(jīng)濟(jì)而有用。因?yàn)樵谳敵鲭娏鬟M(jìn)程中遭受損壞，鎂合金陽(yáng)極的描繪運(yùn)用年限更棒與管道的運(yùn)用年限相匹配，既不發(fā)作鋪張也不多添加維護(hù)費(fèi)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.
不一樣的防腐辦法有不一樣的防腐質(zhì)量和費(fèi)用，應(yīng)根據(jù)被維護(hù)聚氨酯保溫鋼管的不一樣壓力、不一樣用處及其所在的不一樣環(huán)境和運(yùn)送的不一樣燃?xì)猓瑲w納全部地思考防腐辦法和防腐費(fèi)用。當(dāng)扁平量添加到50毫米時(shí)，裂縫逐步添加到邊部全管段，試驗(yàn)成果，管徑1%的扁平量時(shí)發(fā)作"發(fā)狀"裂縫，當(dāng)扁平量為6-9%的場(chǎng)合，沙漿涂層開(kāi)端崩裂，到達(dá)管徑30%時(shí)脫落。這在施工中是決不允許發(fā)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.
聚氨酯保溫鋼管在受外壓變形變扁平常，砂漿會(huì)發(fā)作"發(fā)狀"裂縫，但要砂漿從管壁上剝離卻是十分艱難的，在口徑DN800毫米壁厚為7.1毫米的鋼管上，截取一米長(zhǎng)的管段，涂襯11毫米厚的砂漿涂層，當(dāng)扁平量7-8毫米時(shí)，可以看到"發(fā)狀"裂縫的呈現(xiàn)。據(jù)測(cè)定，在DN1100管子上，更小扁平量為15毫米，DN1800管上為21毫米。由此可見(jiàn)，管徑的增大，發(fā)作裂縫的扁平量也隨之增大。水泥沙漿面料有以下幾個(gè)顯著的長(zhǎng)處：避免管道內(nèi)壁腐蝕銹垢的發(fā)作，使管道長(zhǎng)期保持杰出的輸水狀況，摩阻系數(shù)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.
水泥砂漿的施工有兩種辦法。一是地上離心法。首要適同于DN400口徑以下的管道內(nèi)襯施工。而是地下噴涂法，首要適用于DN700口徑以上的管道在地下防腐施工。因?yàn)槊媪贤繉拥淖韪?，水體不與金屬管道觸摸，包管了水質(zhì)。
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.
管道內(nèi)壁由水泥砂漿的防腐，避免了腐蝕穿孔，延長(zhǎng)了管道運(yùn)用壽命，水泥沙漿涂層的資料選材便利，施工周期短，防腐作用好，下降管道工程的本錢(qián)。鑒于水泥砂漿具有上述長(zhǎng)處，其防腐的功用和經(jīng)濟(jì)性，被越來(lái)越多的國(guó)內(nèi)外的工程技術(shù)部門(mén)認(rèn)可，國(guó)內(nèi)大中城市都推行運(yùn)用水泥砂漿作為給水金屬管道內(nèi)防腐的首要受點(diǎn)。國(guó)家也為此擬定了水泥砂漿面料的標(biāo)準(zhǔn)和質(zhì)量標(biāo)準(zhǔn)。
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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