What should be done for X-ray inspection of spiral steel pipes? 2024-12-19
According to the industry standard for spiral steel pipes, whether it is a standard spiral steel pipe or a national standard spiral steel pipe, it must undergo flaw detection testing. Some comrades have said that the standard for spiral steel pipes (SY/T5037-2012) is also used? In fact, it's because you don't really understand the Ministry Standard. The Ministry Standard originated from the first production line in China in 1956, which was based on the standards of the former Soviet Union. Although the standard was low, there were requirements for inspection, such as 20% X-ray spot detection. In a sense, it basically meets the production requirements. Generally speaking, the medium conveyed by the Ministry Standard spiral steel pipe is sewage and drinking water. In terms of welding quality, the Ministry Standard spiral steel pipe is pressurized to ensure no water leakage, and X-ray spot detection ensures that the weld is qualified.
What is the process flow of Mengcun large-diameter spiral steel pipe? 2024-12-19
Large caliber spiral steel pipe is a spiral seam steel pipe made of strip steel or rolled plate as raw material, often formed by warm extrusion, and welded by automatic double wire double-sided submerged arc welding process Below is a brief introduction to the manufacturing process of large-diameter spiral steel pipes: The raw materials are strip steel coils, welding wire, and flux. Strict physical and chemical tests must be conducted before investment. The head and tail of the strip steel are connected by single or double wire submerged arc welding, and automatic submerged arc welding is used for repair welding after being rolled into a steel pipe. Before forming, the strip steel undergoes leveling, trimming, planing, surface cleaning, conveying, and pre bending treatment. The use of an electric contact pressure gauge to control the pressure of the oil cylinders on both sides of the conveyor ensures the smooth transportation of the strip steel. Adopting external or internal control roller molding. Adopting a weld seam gap control device to ensure that the weld seam gap meets the welding requirements, the pipe diameter, misalignment, and weld seam gap are strictly controlled. Both internal and external welding are carried out using American Lincoln welding machines for single or double wire submerged arc welding, in order to achieve stable welding quality. The welded seams are all inspected by an online continuous ultrasonic automatic damage tester, ensuring 100% non-destructive testing coverage of spiral welds. If there is a defect, it will automatically sound an alarm and spray a mark, and production workers will adjust the process parameters accordingly to eliminate the defect in a timely manner. Use an air plasma cutting machine to cut steel pipes into individual pieces. After cutting into individual steel pipes, each batch of steel pipes must undergo a strict initial inspection system to check the mechanical properties, chemical composition, fusion condition, surface quality of the welded joints, and undergo non-destructive testing to ensure that the pipe manufacturing process is qualified before it can be officially put into production. The parts with continuous ultrasonic testing marks on the weld seam shall be manually inspected by ultrasonic and X-ray. If there are indeed defects, they shall be repaired and undergo non-destructive testing again until it is confirmed that the defects have been eliminated. The pipes where the welded joints of the strip steel and the T-shaped joints intersecting with the spiral welds are located are all inspected by X-ray television or film. Each steel pipe undergoes a hydrostatic pressure test, and the pressure is sealed radially. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Automatic printing and recording of experimental parameters. Mechanical processing of pipe ends to accurately control the perpendicularity, slope angle, and blunt edge of the end face. Although affected by the economic crisis, the large-diameter spiral steel pipe company is recovering and developing, welcoming a better tomorrow. Large diameter spiral steel pipes have played a significant role in the transportation of gas.
Introduction to the standard of 3PE anti-corrosion spiral steel pipe 2024-12-19
If anti-corrosion steel pipes are classified according to their types, they can be mainly divided into several forms: anti-corrosion spiral steel pipes, anti-corrosion straight seam steel pipes, and anti-corrosion seamless steel pipes. The common form of anti-corrosion steel pipes on the market now is 3pe anti-corrosion. The SY/T0413-2002 standard has been implemented domestically since August 1, 2002. The standard mainly specifies polyethylene and high-density polyethylene, with a Vicat softening point set at not less than 110 ℃; The thickness of the external anti-corrosion layer is determined according to the German standard DIN30670-1991, which mainly uses low and medium density polyethylene. Improved the impact resistance of the 3PE anti-corrosion coating. SY/T0413-2002 significantly improves the peel strength and impact resistance indicators of the 3PE anti-corrosion layer, and specifies that based on the carbon black content of some special materials, the mechanical strength and weather resistance of the 3PE anti-corrosion layer have been improved, and the sampling frequency of the joint peeling strength (i.e. the peeling strength of the heat shrink sleeve and heat shrink tape to the primer steel) has been increased. The anti-corrosion spiral steel pipe 3PE structure anti-corrosion coating combines the advantages of high-density polyethylene coating and fusion bonded epoxy powder. The epoxy powder of this system is firmly bonded to the surface of the steel pipe, utilizing high-density polyethylene to resist mechanical damage. The special adhesive layer between the two layers forms a composite structure of molecular bonds, thereby achieving a good combination of anti-corrosion and mechanical properties.
Research on Spiral Pipe Fracture in Hebei Spiral Steel Pipe Factory 2024-12-19
In the current steel pipe industry, there is a lot of further research on the fracture of straight seam pipes, but there is very little research on spiral welded steel pipes, which will take several years. Foreign countries are also starting to do this work, but it has not been introduced to China. The steel pipe factory mainly produces spiral steel pipes. The buried steel pipes nowadays are all spiral steel pipes, so the problem of spiral steel pipe rupture is very serious. So there is very little research on the rupture of spiral steel pipes abroad, mainly due to two reasons: one is that the application of spiral pipes and straight seam pipes is very limited, especially in the study of rupture of important tracheal lines; Another issue is that the study of steel pipe rupture is very rare, so the results of straight seam pipe research are often applied to spiral steel pipes. The research on the rupture of spiral steel pipes is still in its infancy. The characteristics of spiral steel pipe rupture: Samples are taken from different directions of the steel pipe, and then subjected to tensile and Charpy impact tests; For pipelines, the maximum principal stress is the circumferential stress, and the direction of maximum driving cracking is generally along the axial direction. But for straight seam pipes, the direction of maximum driving cracking and the minimum resistance to fracture are consistent; Defects in welded pipes are difficult to detect in raw materials, usually in the weld seam or heat affected zone, but their two defects are consistent with the weld seam. The defect direction of straight seam pipes is axial, while the defect direction in spiral pipes is oblique. In general, although the tensile test results of spiral steel pipes are basically independent of the sampling direction, if it is a Charpy impact test, it is closely related to the sampling direction; The difference between the rupture of a spiral tube and a straight seam tube is that for a straight seam tube, the driving direction of rupture or expansion must be along the axis and must be mutual. However, for spiral tubes, the direction of maximum driving force and minimum resistance for rupture and expansion is not consistent.
對于螺旋鋼管的防腐除銹具體該如何做？ 2024-12-19
?。?)現(xiàn)場宜采用除銹機除銹。除銹作業(yè)中，應(yīng)根據(jù)環(huán)境狀況采取防噪音、降塵和消防措施。除銹機應(yīng)有防護罩，周圍不得有易燃物。 ?。?)施工現(xiàn)場不宜使用噴砂除銹?，F(xiàn)場需使用時，應(yīng)采用真空噴砂、濕噴砂等，且必須采取除塵和隔音措施，并在操作范圍內(nèi)設(shè)安全標志。 ?。?)人工除銹時，應(yīng)按規(guī)定佩戴口罩、眼鏡、手套等勞動保護用品；場地應(yīng)平整，通風(fēng)良好；管子應(yīng)擋掩牢固，不得在不穩(wěn)定的管身上除銹。
大口徑螺旋鋼管的焊接該如何做？ 2024-12-19
焊接神舟大口徑螺旋鋼管首先清理干凈焊口的油，漆，水，銹等，然后根據(jù)壁厚開坡口，厚的就開大一些，薄的就開小一些(角磨機)，然后就是對口的縫隙，一般是焊條或焊絲直徑的1-1.5倍，如果你坡口不小心開大了話可以適當留小一些。點固焊至少三點，一般四點比較好干活。 焊接神舟大口徑螺旋管的時候應(yīng)該一半一半焊接，起點最好超過最底點一公分左右，那樣從對面好接頭。如果鋼管壁厚的話，應(yīng)該分層，至少兩層，第一層整圈焊完才可以焊第二層。
螺旋鋼管在管道運輸方面有哪些應(yīng)用 2024-12-19
隨著社會的發(fā)展，現(xiàn)在隨著海洋油氣開發(fā)，海底管道得到了飛速的發(fā)展，這當然對管道的要求越來越高。螺旋管直徑大，強度高，螺旋鋼管實用的特點使它成為很多長距離管道選擇管道。事實上，螺旋管管道運輸具有許多優(yōu)點，有一個缺乏體積應(yīng)變能力。只是凝固點高，含蠟原油，高于設(shè)計輸量，將現(xiàn)有的管道承壓能力和抽水能力的限制；低于設(shè)計，將現(xiàn)有的管道熱力條件。為了克服固定點，只有在減阻劑和降凝劑。目前，中國的二管道工業(yè)的發(fā)展高峰會。螺旋鋼管的發(fā)展也將投資，提高管道運輸能力。 隨著螺旋管強度的增加和直徑的增加，由于缺乏認識的重要性，沖擊韌性，在世界很多地方都有脆弱性和彈性的管道破裂事故。管鋼管焊管韌性指數(shù)實際上已經(jīng)成為一個重要指標。螺旋焊管韌性裂紋的失穩(wěn)擴展和失穩(wěn)擴展。如何避免管道斷裂的方法，對基地和焊接金屬壓扁試驗，彎曲試驗，跌落試驗，沖擊試驗和許多其他的韌性指標。不僅對管道具有高韌性的要求，近年來該行還提出了更高的沖擊韌性要求。長距離管道，避免裂縫是非常困難的，螺旋鋼管事實上在國內(nèi)和國外都很難做到。這是因為管道數(shù)百公里甚至超過1000公里長，焊接，焊嘴太多，加上建筑和運輸過程中造成的損害等，使建筑和風(fēng)險增加。
地下自來水用哪種防腐鋼管質(zhì)量好 2024-12-19
目前我國對于地下自來水輸水管道都要求進行防腐，目前TPEP防腐鋼管是作為輸水管道好的一種防腐鋼管。自來水輸水管道外壁防腐主要有3PE防腐和環(huán)氧煤瀝青防腐兩種，不管從質(zhì)量還是防腐效果及使用壽命方面3PE防腐效果都是好的，內(nèi)壁防腐主要是應(yīng)用IPN8710無毒防腐涂料，TPEP屬于內(nèi)壁和外壁防腐的組合產(chǎn)品。
防腐鋼管的重要性及優(yōu)勢 2024-12-19
防腐鋼管在人們的日常生活中扮演著重要的不同的角色，防腐鋼管一般指的是采用特殊的工藝對普通的鋼管進行防腐化處理，使鋼管具有一定的防腐蝕能力，一般還是用于防水、防銹、防酸堿、防氧化等特性，一般所說的PE防腐鋼管指的就是聚乙烯防腐鋼管，就是利用先進的科學(xué)和工藝加工而成的管狀物品，PE防腐鋼管廣泛的應(yīng)用在石油、天然氣、城市燃氣、城市供水、水煤漿輸送管線等方面。 根據(jù)需求的不同還可對鋼管內(nèi)外壁進行相對應(yīng)的防腐措施，常見的主要有環(huán)氧煤瀝青防腐鋼管、聚氨酯類涂料防腐、防腐鋼管內(nèi)壁水泥砂漿防腐等，防腐鋼管主要應(yīng)用在有特殊要求或者惡劣環(huán)境中的工程領(lǐng)域。 防腐鋼管是指經(jīng)過防腐工藝加工處理，可有效防止或減緩在運輸與使用過程中發(fā)生化學(xué)或電化學(xué)反應(yīng)發(fā)生腐蝕現(xiàn)象的鋼制管道。根據(jù)我國統(tǒng)計數(shù)據(jù)，每年國內(nèi)的鋼管腐蝕直接經(jīng)濟損失2800多億，當前全球每年因鋼管腐蝕損失高達5000億美元。防腐鋼管可有效地防止或減緩腐蝕延長鋼管的使用壽命，降低鋼管運行成本。防腐鋼管的特點，耐腐蝕、不泄露、高韌性、具有優(yōu)良的撓性、具有良好的抵抗刮痕能力、具有良好的快速裂紋傳遞抵抗能力，在一個就是防腐鋼管的使用壽命廠，在大于等于60攝氏度的環(huán)境下可以使有50年以上的壽命。 鋼管通過防腐除了提高了鋼管的使用壽命外，具體還表現(xiàn)在以下幾個方面： 1、結(jié)合鋼管的機械強度和塑料的耐蝕性于一體。 2、外壁涂層達2.5mm以上，耐劃傷、耐磕碰。 3、內(nèi)壁摩阻系數(shù)小，0.0081-0.091，降低能耗。 4、內(nèi)壁光滑不易結(jié)垢，具有自清潔功能。
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