Changsha Xiangjia Metal Materical Co., Ltd.

The difference between   straight seam pipe   and   spiral pipe : 1.From the perspective of processing: straight seam pipe are formed by bending steel plates of a certain width into cylinders and then welding them to form. The equipment is simple and the productivity is high. Spiral pipes are made by winding steel plates of a certain width into a tube, and then welding them. The equipment is complicated. At the same time, because the welds are much longer than the straight seam steel pipes, the productivity is relatively low. 2. From the perspective of strength: the internal stress of straight seam steel pipe is distributed along the weld seam after welded, while the internal stress of the spiral steel pipe after welded is evenly distributed in the axial and radial directions, which can partially offset the pressure. So in terms of pressure resistance, spiral steel pipe is stronger. Here is the difference between straight seam pipe and spiral pipe from the perspective of processing and

1.Pipe derusting, the surface of the pipes should be clean before paintting. Sandblasting to remove rust able to make pipe standard reach to  Sa2.5 level. 2. After removing the rust, then apply primer and the time interval between them should not exceed 8 hours. When applying the primer, the base surface should be dry. The primer shall be applied evenly and fully without clotting or bubbling. 3. After the surface of the primer is dry, apply the top coat and wrap the glass cloth. The time interval between the primer and the first top coat should not exceed 24 hours. Process of  seamless steel pipe  anti-corrosion is a relative complicated . It is necessary to strengthen the advantages of various technologies and anti-corrosion methods to avoid corrosion, so that seamless steel pipes will have better performance. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturi

The hydrostatic pressure test is an indispensable part of the steel pipe manufacturing process. Its aim to detect the anti-leakage function of the steel pipe under the standard test pressure and the stable time. Same as radiographic, ultrasonic and other flaw detection techniques, it is a way to check the overall quality of  casing pipe . So what are the requires for the hydrostatic pressure test of oil casing pipe? Here is a brief introduction:   1. The hydrostatic test pressure value of the pipe with coupling and thread is the lowest value of the hydrostatic test pressure of the flat-end pipe, the maximum hydrostatic test pressure of the coupling, and the minimum value of the internal pressure leakage resistance, but the maximum pressure of the criterion is 69MPa, and the calculated pressure, the value is around 0.5 MPa.   2. According to API requirements, the hydrostatic test pressure measuring device should be calibrated within 4 months before each use.   3. If customers have uniqu

The raw material of   seamless steel pipe   is iron, which easy to rusty and will affect the service life. Therefore, anti-corrosion is a process that must be done before pipeline construction. 3pe anti-corrosion or epoxy coal tar pitch is two methods that mainly used for seamless steel pipe. The following is an precaution introduction for seamless steel pipe anti-corrosion. Seamless steel pipe anti-corrosion process 1. The anti-corrosion of the steel pipe is in accordance with the requirements of the drawings, using epoxy coal tar paint outsourcing the glass cloth, and the outer coating is anti-corrosion painting. 2. The outer wall construction process: pipeline derusting → primer coating → first pass top coat → second pass top coat → wrap glass cloth → top coat → top coat; 3. Inner wall construction process: pipeline derusting → primer coating → first pass top coat → second pass top coat → third pass top coat

Small-diameter precision tube   are small-diameter seamless tube with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. Advantages: small-diameter precision tubes are made of precision seamless pipes to make mechanical structures or hydraulic equipment, which can greatly save machining hours and improve material utilization and product quality. The formula for calculating the weight of small-diameter precision steel pipes: [(outer diameter-wall thickness)*wall thickness]*0.02466=kg/m (weight per meter) Small-diameter precision seamless pipes can be used for oil pipes, medical appliances, mechanical pipes, gasoline engines, diesel engines, etc. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe in various grades and sizes. Years of production experience and manufacturing facilities who

Oil casing pipe   is used to support the wall of oil and gas wells to ensure the operation of the entire oil well during the drilling and after. The oil casing pipe needs to do hydraulic test before it leaves the factory, which is an important means of inspecting the quality of the oil pipe. It needs to fill the pipe with water and check its ability to maintain the specified pressure without leakage or rupture under pressure.   The hydraulic testing machine is used to detect the pressure bearing of casing pipe, the test pressure is 70mpa, 9 5/8", 7", 5 1/2", 5", 4 1/2", 3 1/2 ", 2 7/8, etc. to meet different specifications of casing pipe. It adopts the pressurizing cylinder method to pressurize, the pressurization method is fast and reliable, and it is equipped with an automatic control system that can display the pressure curve in real time, output the test report and save the test data. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division

1. Before assembling the   flange , the flange surface, it is nessary to clean the sealing surface. 2. When assembling flat welding flange, the end of the pipe should be inserted into 2/3 of the thickness of the inner diameter of the flange, and then the flange should be spot welded to the pipe. Check and correct the flange position from different directions so that the sealing surface is perpendicular to the center line of the pipe, and then spot weld the second point below it after it is correct. 3. Use a 90° angle ruler to check and correct the flange position from the left and right side, and then spot weld the third and fourth points after passing the test.  4. To the assembly of a pair of flanges, the bolt holes of the flange to be installed should be aligned with the corresponding bolt holes of the flange that has been fixed, and parallel to the flange that has been fixed, and the deviation should not be 1.5‰ bigger than the outer diameter of the flange, which not over 2mm. 5.