LSAW Steel Pipe

　　The refined oil pipeline in the oil pipelines are mainly used to transport refined oil products to oil sales companies, or pipelines for transporting semi-finished oils to refining and chemical enterprises. The product has a low freezing point and does not require heat treatment. At the same time, the oil is exported in many varieties, in large quantities, and has many oil distribution points. It is often in the form of sequential transportation. The starting point of transportation is usually the refinery, and the end point is usually consumption. Regional oil storage or distribution of oil depots. 　　The route of pipeline transportation of refined oil products is: oil terminal, oil depot, long-distance pipeline of refined oil, refinery, oil depot, long-distance pipeline of refined oil, and oil sales company. 　　Natural gas pipeline transportation in oil pipelines, because of the high shipping cost of natural gas compression tanks, the direct pipeline transportation method is usua...

　　Do not mixing the use of steel tubes of diameters of 48mm and 51mm. 　　The putlog couplers on adjacent standing tubes shall be stagger settled, and the connecting heads on adjacent standing tubes shall not be set in the same lift. For the adjacent tube heads every one standing tubes, the splitting placement distance on the height shall not be less than 500mm. And the distance from the tube head center to the main joints shall not be bigger than 1/3. 　　When starting the erection of standing scaffolding tubes, there shall also be set an prop every 6 spans and can be dismantled until the tie members are sturdily installed and fastened to the main building body. When the erection height reaches to the structures of tie members, when all the standing tubes including the stainless steel square tube, longitudinal tubes and the transverse tubes are erected, the tie members shall be added into immediately close to the main tube joints and the deviation distance to the main joints shall be...

　　Q345B is a material for steel pipes . Q represents the yield of this material, and the back 345 refers to the yield value of this material. 　　The Q345B steel pipe is a 16Mn steel pipe, which is one of the seamless steel pipe products. 16Mn is a material in steel. A name for steel in the past. Now called the law: Q345B. 16Mn is a low-alloy steel series. In this series, it is the most common material, or the grade of steel plate. The Q345B steel tube represents the carbon content of this steel in the range of about 0.16%. Mn alone was proposed because the five elements (carbon C, silicon Si, manganese Mn, phosphorus P, sulfur S) have high manganese content and are proposed separately. About 1.20-1.60%. Special treatment heat treatment: controlled rolling, normalizing, etc.Z-direction performance: Z15, Z25, Z35. Main features: good overall performance, good low temperature performance, cold stamping performance, good welding performance and machinability. 　　Q345B steel pipe weight f...

　　The oil casing pipe is used to support the oil and gas well walls to ensure the normal operation of the entire well after the drilling process is completed. Each well is based on different depths of drilling and geology, using several layers of casing. After the casing is down, the cement is to be cemented. It is different from the oil pipe and the drill pipe and cannot be reused. It is a disposable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. 　　The oil special pipe is mainly used for drilling oil and gas wells and conveying oil and gas. It includes oil drill pipes, oil casings, and oil pipes. Oil drill pipes are mainly used to connect drill collars and drill bits and transmit drilling power. The oil casing is mainly used for supporting the well wall during and after the completion of the drilling process to ensure the drilling process and the normal operation of the entire well after completion. The oil pipe mainly transports th...

　　The casing pipe is a large-diameter pipe that acts as a fixed oil and gas well wall or wellbore. The casing is inserted into the wellbore and fixed with cement to prevent the wellbore from separating the formation and the wellbore from collapsing, and to ensure that the drilling mud circulates for drilling.Different types of casing used in oil extraction: 　　The surface oil casing is to protect the well from being contaminated by shallow water and shallow gas layers, supporting the piercing equipment and maintaining other layers of the casing. 　　The technical oil casing is to separate the pressures at different levels so that the drilling fluid can flow normally and protect the production casing to install the anti-burst device, the leakage prevention device and the tail pipe in the drilling. 　　The oil layer oil casing mainly exports oil and natural gas from the subsurface storage layer, protects the well with the liver, and stratifies the drilling mud. When producing oil casing...

　　The causes of large diameter spiral pipe wrong side: large diameter spiral steel pipe production, the wrong side have occurred with many of its factors. In the production practice, often the wrong side of the ultra-poor leaving dry pipe downgrade. Therefore analyze the causes and prevention of large diameter spiral pipe produced the wrong side is necessary. 　　1, the strip camber is caused by the wrong side of the main factors pipe. In forming the spiral welded pipe, steel strip camber angle will constantly change shape, leading to changes in the weld gap, resulting in open seams, wrong side or even take sides. Seriously affecting the quality of steel, so the observation camber steel strip coil-after by controlling the vertical roll can be cut to make the disc as well as the continuous removal of part of camber angle control and corrective shaping is to reduce the camber of the strip in the production process effective way to produce the wrong side. 　　2, due to the poor without t...

　　Difference between hot stretch reducing pipe and LSAW steel pipe are basically has the following two points: 　　1, Resulting in differnce on product quality due to the different processes, hot stretch reducing also carried out a process after high-frequency welding process that lsaw steel pipe can not found ------ Longitudinal are no clear line inside and outside burrs. Burr presence will affect the tube fluid - flow, burr block the normal flow of fluid, resulting in a whirlpool. According to principles of fluid mechanics, welding must increase local compression, discontinuity make pipe safety factor is also greatly reduced, hot stretch reducing steel production process - fully taken into account the existence of the risk of burrs, to limit burr removal, making it uniform thickness, no difference in the appearance and seamless. So from this point of view, hot stretch reducing pipe joints also completed the transition seamless. 　　2, Weld quality directly determines the quality of ...

　　Transverse crack after lsaw steel pipe measures rework appear, specifically: 　 　1. Confirm defect 　　All welds 100% UT inspection, crack marked location, length, depth and direction. If the entire weld has defects, the proposed dig out the entire re-submerged arc weld, partial repair is recommended SMAW. 　　2, Planing preheat 　　Preheating temperature is 110-170 ℃, preheating temperature weld both sides of the detection position is not less than 150mm, the heating is within the range of from defects around 500mm. 　　3, Gouging 　　Gouging out both ends of the range of cracks, weld integrity is not less than 50mm Outbound middle gouging, gouging ends gently to smooth the transition, the transition surface and a vertical line at least greater than 45 °. Gouging carbon rod angle should be at 60 ° or less, particularly in the crack to arrive at an angle as small as possible. 　　4, Polished 　　Polished to no black, polished surface after the transition should be smooth, there sho...

　　The American Petroleum Institute API standard specifically targets oil and gas: casing, tubing and line pipe standards used in industry. In the standard, the casing and tubing steel grades are divided into several grades, namely H-40, J-55, K-55, N-80, L-80, C-90, T-95, P-110, Q- 125, each level has a different heat process. In API 5CT, the raw materials were divided into four groups. The first group is H, J, K, N, the second group is C, L, T, the third group is P, and the fourth group is Q. The numbers represent the intensity level, and the codes K, N, L, C, and T represent nothing to explain. The following numbers represent the minimum yield strength of the material. The unit is KSI (thousands per square inch), H, N, K, J is the first group, the yield strength of the material is 200 MPa, L, C, T are two groups, the yield strength of the material is 100 MPa, P110 is the third group, and Q125 is the fourth group. 　　The API is divided into 4 groups. 　　The first group represents an...

　　In addition to large-caliber LSAW steel pipe as a structural material generally has good mechanical and process performance, but also has the use of stainless steel corrosion environment, maintaining the appearance of fine excellent characteristics, but also with acid and alkali resistance, high stainless steel pipe temperature, low temperature resistance, excellent magnetic properties, wear and other functions. Stainless steel pipes and other metal materials have been widely used in construction projects also has the following characteristics compared. 　　1) Large Diameter Longitudinal has a high specific strength and specific stiffness. Specific strength and stiffness of structural engineering in the selection of materials two basic parameters. Strength is the ratio of strength and weight, high-strength steel for the 52 different types of stainless steel pipes in different state than the intensity of the heat treatment may be in the range of 46 to 152, while the aluminum alloy co...