Plastic coated steel pipes are used in various types of circulating water systems (civil circulating water, industrial circulating water). They have excellent performances and can last up to 50 years for corrosion protection. Fire fighting water supply systems, water supply and drainage systems for various buildings (especially for cold and hot water systems in hotels, hotels and high-grade residential areas), and various chemical fluids (acid, alkali, salt resistance) Corrosion, wire and cable buried pipe, crossing pipe, mine, mine ventilation pipe, supply and drainage pipe. Adhesion test adhesion test carried out according to 7.4.2, the test results should meet the requirements of 5.6. Bending test of DN coated steel pipe with a thickness of less than 50mm is carried out. The length of the pipe specimen is (1200 + 100) mm. In the environment of temperature (20 During bending test, there is no filler in the pipe, and the weld is located on the side of the bending main surface. After the test, the specimen is dissected from the middle of the bending arc to check the inner coating. The test results should meet the requirements of 5.7. Three-layer structure polyethylene (3PE) anticorrosive coating has been widely used in oil pipeline industry because of its good corrosion resistance, water and gas permeability resistance and mechanical properties. The 3PE anticorrosive steel pipe - anticorrosive coating is very important for the life of buried pipelines. Some pipelines of the same material are buried underground for decades without corrosion, and some of them are leaked in a few years. It is because they use different external anticorrosive coatings.

帶有螺紋、法蘭、溝槽連接的涂覆鋼管，規(guī)定 。內(nèi)外涂鋼塑復(fù)合管是把普通鋼管經(jīng)過工藝處理，在鋼管內(nèi)、外表面涂覆一種特質(zhì)的環(huán)氧樹脂材料而制得的鋼塑復(fù)合管道，集鋼材的機(jī)械性能于塑料涂層的耐腐蝕性能于一體 。表面處理可以提高涂膜對管子的附著力和涂膜的耐久性 。表面處理一般可分為兩大類，一種是機(jī)械處理，包括噴砂噴丸、砂紙打磨、鋼刷子刷等幾種，主要去除管子上的毛刺、鐵銹、棱角等；另一種是化學(xué)處理，包括洗滌劑除油、堿除油、鹽處理、酸除銹、化學(xué)氧化處理等鋼塑復(fù)合管放到溝內(nèi)，逐段碼成直線進(jìn)行連接，連接好的管道須找好坡度 。首先說到我們所說的*點(diǎn)就是偽劣鋼管易出現(xiàn)折疊 。涂塑管的工藝標(biāo)準(zhǔn)
   表面處理一般可分為兩大類，一種是機(jī)械處理，包括噴砂噴丸、砂紙打磨、鋼刷子刷等幾種，主要去除管子上的毛刺、鐵銹、棱角等；另一種是化學(xué)處理，包括洗滌劑除油、堿除油、鹽處理、酸除銹、化學(xué)氧化處理等涂塑復(fù)合管從字面上的意思理解也就是在鋼管的管壁上涂覆了具有防腐效果的環(huán)氧樹脂或者是聚乙烯等涂層材料，而襯塑復(fù)合鋼管，我們從字面上了解，在鍍鋅鋼管內(nèi)壁通過冷拔或者是內(nèi)脹等工藝將塑料管粘結(jié)在鋼管上，襯塑復(fù)合鋼管用在給排水上面還是比較多，但是隨著人們生活水平、環(huán)保意識的提高以及對健康的日益關(guān)注帶有螺紋、法蘭、溝槽連接的涂覆鋼管，規(guī)定 。鋼塑復(fù)合管是隨著鍍鋅管的一度被禁止而隨之出現(xiàn)的，鋼塑復(fù)合管顧名思義就是鋼管與塑料的結(jié)合，同時(shí)，鋼塑復(fù)合管按照成型又可以分為兩類：涂塑復(fù)合鋼管和襯塑復(fù)合鋼管 。（2）為確保管道不會在壓力作用或水錘作用產(chǎn)生軸向竄動，應(yīng)對其進(jìn)行固定，如用支墩、托架、吊架等 。上世紀(jì)50年代以前，防腐涂層采用的材料主要是煤焦油瓷漆等材料使管道得到較好的保護(hù)，但這些材料也存在很多缺點(diǎn)，使用范圍受到一定限制，直到50年代末重防腐熔結(jié)粉末涂料的推出，才使管道防護(hù)技術(shù)產(chǎn)生了飛躍 。