In the spiral pipe production process and the use, there are invented a lot of excellent welding and methods of production, greatly contributed to the steady and rapid development of the industry, but also makes this industry has been optimized in development. Which submerged arc welding is a welding method in a new invention in 1940, it and the front of the place is the same manual welding or the use of slag to protect it, but this is not the slag electrode coating, is designed smelting flux out. Changed after the wire, the wire delivery device with a plate and the wire, the wire is continuously sent, this welding wire is fed continuously in a granular fusible flux covering ignition arc welding wire, base material and part of the melting and evaporation flux forms a cavity, the arc is stable combustion in the cavity inside, so call it submerged arc welding. Arc is buried in the inside of the cavity. The welding flux hopper loading system consists of a drug delivery through a pipe to be welded to the front of the second type of welding is used, the use of wire, since the wire can be continuously sent; Rod, a rod that we must have a burn a welding head gave the throw, and the operation was stopped, and then change electrode welding.
And such welding method compared with other methods is the great advantage, the first advantage is fully automated; the second advantage, which is buried Under arc welding, so it's the heat exchange and protection of relatively strong performance, high quality welding out; third advantage, because the submerged arc welding arc buried in the flux, so it can be used a large current, welding efficiency relatively high.
2019年2月26日星期二
Production and requirement of welded steel pipe
Welded steel pipe, also called steel flower welded pipes, is a steel pipe made by welding a steel plate or a steel strip after being crimped. The welded steel pipe has simple production process, high production efficiency, many varieties and specifications, and low equipment investment, but the general strength is lower than that of seamless steel pipe. Since the 1930s, with the rapid development of high-quality strip continuous rolling production and the advancement of welding and inspection technology, the quality of welded joints has been continuously improved, the variety specifications of welded steel pipes have been increasing, and more and more fields have replaced seamless steel pipe.
Welded steel pipes are divided into straight welded pipes and spiral welded pipes in the form of welds. Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with a larger diameter by using a narrow blank, and it is also possible to produce a welded pipe having a different pipe diameter with a blank of the same width. However, compared with the straight pipe of the same length, the weld length is increased by 30 to 100%, and the production speed is low. Therefore, the smaller diameter welded pipes are mostly straight seam welded, and the large diameter welded pipes are mostly spiral welded.
1. Welded steel pipes for low-pressure fluid transportation are also called general welded pipes, commonly known as black pipes. It is a welded steel pipe for conveying general low pressure fluids such as water, gas, air, oil and heating steam and other purposes. The thickness of the steel pipe is divided into ordinary steel pipe and thick steel pipe; the pipe end form is divided into non-threaded steel pipe (light pipe) and threaded steel pipe. The specification of the steel pipe is expressed by the nominal diameter (mm), and the nominal diameter is an approximation of the inner diameter. It is customary to use inches, such as 11/2. The welded steel pipe for low-pressure fluid transportation is mainly used as a raw pipe for galvanized welded steel pipe for low-pressure fluid transportation, in addition to being directly used for conveying fluid.
2. Galvanized welded steel pipes for low-pressure fluid transportation are also called galvanized electric welded steel pipes, commonly known as white pipes. It is a hot dip galvanizing (furnace welding or electric welding) steel pipe for conveying water, gas, air, oil and general lower pressure fluids such as heating, steam and warm water. The thickness of the steel pipe is divided into ordinary galvanized steel pipe and thick galvanized steel pipe; the connection end form is divided into non-thread galvanized steel pipe and threaded galvanized steel pipe. The specification of the steel pipe is expressed by the nominal diameter (mm), and the nominal diameter is an approximation of the inner diameter.
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Welded steel pipes are divided into straight welded pipes and spiral welded pipes in the form of welds. Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with a larger diameter by using a narrow blank, and it is also possible to produce a welded pipe having a different pipe diameter with a blank of the same width. However, compared with the straight pipe of the same length, the weld length is increased by 30 to 100%, and the production speed is low. Therefore, the smaller diameter welded pipes are mostly straight seam welded, and the large diameter welded pipes are mostly spiral welded.
1. Welded steel pipes for low-pressure fluid transportation are also called general welded pipes, commonly known as black pipes. It is a welded steel pipe for conveying general low pressure fluids such as water, gas, air, oil and heating steam and other purposes. The thickness of the steel pipe is divided into ordinary steel pipe and thick steel pipe; the pipe end form is divided into non-threaded steel pipe (light pipe) and threaded steel pipe. The specification of the steel pipe is expressed by the nominal diameter (mm), and the nominal diameter is an approximation of the inner diameter. It is customary to use inches, such as 11/2. The welded steel pipe for low-pressure fluid transportation is mainly used as a raw pipe for galvanized welded steel pipe for low-pressure fluid transportation, in addition to being directly used for conveying fluid.
2. Galvanized welded steel pipes for low-pressure fluid transportation are also called galvanized electric welded steel pipes, commonly known as white pipes. It is a hot dip galvanizing (furnace welding or electric welding) steel pipe for conveying water, gas, air, oil and general lower pressure fluids such as heating, steam and warm water. The thickness of the steel pipe is divided into ordinary galvanized steel pipe and thick galvanized steel pipe; the connection end form is divided into non-thread galvanized steel pipe and threaded galvanized steel pipe. The specification of the steel pipe is expressed by the nominal diameter (mm), and the nominal diameter is an approximation of the inner diameter.
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Steel Pipe Uses in Gas Project
Steel pipe is the most widely used gas pipe project. Its main advantages are: high strength, good toughness, bearing stress, impact resistance and tight, good plasticity, easy welding and thermal processing, the wall thickness is thinner, saving metal. But its poor corrosion resistance, need to have proper anti-corrosion measures.
Steel pipes for gas pipelines in the main city of seamless and welded steel pipe in two categories. High strength seamless steel pipe, but limit the production process and costs by generally small diameter steel pipe DN200 below. More types of welded steel pipes, welding can be divided by straight seam welded steel pipes and spiral welded steel pipe types. Among them, straight seam welded steel pipe (hereinafter referred to as straight seam pipe) also includes LSAW steel pipe and high frequency resistance welding (ERW) steel pipe and other types. Spiral welded steel pipe (ssaw steel pipe) is a spiral seam double submerged arc welded (HSAW) pipe.
The straight seam and spiral pipe manufacturing process are compared, the former has the advantage of:
① spiral pipe manufacturing process to determine their residual stress is greater than the straight seam pipe, straight seam pipe with the overall result of expanding process, residual stress close to zero, while the spiral can not do this;
② spiral weld wrong side mostly in the range of 1.1 ~ 1.2mm, the standard requires the amount of the wrong side of the wall thickness to less than 10% for thin-walled tubes, the wrong side is difficult to meet the standard requirements, and straight seam pipe does not exist This problem;
③ Compared with straight seam pipe, spiral weld line flow is poor, serious stress concentration;
④ coil heat affected zone is greater than the straight seam pipe, and pipe heat affected zone is the key to quality;
⑤ spiral geometry accuracy, to the construction site, as counterpart, welding bring some difficulties.
Steel pipes for gas pipelines in the main city of seamless and welded steel pipe in two categories. High strength seamless steel pipe, but limit the production process and costs by generally small diameter steel pipe DN200 below. More types of welded steel pipes, welding can be divided by straight seam welded steel pipes and spiral welded steel pipe types. Among them, straight seam welded steel pipe (hereinafter referred to as straight seam pipe) also includes LSAW steel pipe and high frequency resistance welding (ERW) steel pipe and other types. Spiral welded steel pipe (ssaw steel pipe) is a spiral seam double submerged arc welded (HSAW) pipe.
The straight seam and spiral pipe manufacturing process are compared, the former has the advantage of:
① spiral pipe manufacturing process to determine their residual stress is greater than the straight seam pipe, straight seam pipe with the overall result of expanding process, residual stress close to zero, while the spiral can not do this;
② spiral weld wrong side mostly in the range of 1.1 ~ 1.2mm, the standard requires the amount of the wrong side of the wall thickness to less than 10% for thin-walled tubes, the wrong side is difficult to meet the standard requirements, and straight seam pipe does not exist This problem;
③ Compared with straight seam pipe, spiral weld line flow is poor, serious stress concentration;
④ coil heat affected zone is greater than the straight seam pipe, and pipe heat affected zone is the key to quality;
⑤ spiral geometry accuracy, to the construction site, as counterpart, welding bring some difficulties.
Carbon steel pipe pickling process
Carbon steel pipe pickling method currently are used in the construction and management of two trough pickling pickling inner loop.
(1) trough pickling. The installed piping removed after decomposition into pickling bath soak treatment after passing their secondary installation. This method is suitable for larger diameter tube short, straight, easy to disassemble, piping and a small amount of on-site piping system hydraulics hydraulic piping construction of small amounts of occasions, such as pumping stations, valve stations inside, can be used trough pickling method.
(2) pipe loop pickling. In the installed hydraulic components in the hydraulic lines disconnected or removed with a hose, receivership, rinse cover joints, constitute rinse loop. Acid pump acid into the circulating loop pickling. The pickling method is more advanced construction technology in recent years, with the pickling speed, good effect, the process is simple, easy to operate, reducing pollution on the human body and the environment, reduce labor intensity and shorten the pipeline installation period, resolve long lines and complex piping pickling difficult problem, and to avoid secondary pollution problems trough pickling easy assembly occurs, has been widely used in the construction of large hydraulic system piping.
Pickling formula and process piping will cause unreasonable tube wall can not be completely ex oxide, wall over corrosion, corrosion of the pipe wall and the tube again residual chemical reactions sediment and other phenomena.
(1) trough pickling. The installed piping removed after decomposition into pickling bath soak treatment after passing their secondary installation. This method is suitable for larger diameter tube short, straight, easy to disassemble, piping and a small amount of on-site piping system hydraulics hydraulic piping construction of small amounts of occasions, such as pumping stations, valve stations inside, can be used trough pickling method.
(2) pipe loop pickling. In the installed hydraulic components in the hydraulic lines disconnected or removed with a hose, receivership, rinse cover joints, constitute rinse loop. Acid pump acid into the circulating loop pickling. The pickling method is more advanced construction technology in recent years, with the pickling speed, good effect, the process is simple, easy to operate, reducing pollution on the human body and the environment, reduce labor intensity and shorten the pipeline installation period, resolve long lines and complex piping pickling difficult problem, and to avoid secondary pollution problems trough pickling easy assembly occurs, has been widely used in the construction of large hydraulic system piping.
Pickling formula and process piping will cause unreasonable tube wall can not be completely ex oxide, wall over corrosion, corrosion of the pipe wall and the tube again residual chemical reactions sediment and other phenomena.
Causes of trachoma weld formation
Spiral Pipe(ssaw steel pipe): by strip by roll forming machine, folding spiral direction, and then double-sided submerged arc welding is made through a capacitor. Spiral welded steel pipe production process, prone to leakage in many cases, such as welding and the wrong side. However, in these cases appear Chlamydia is the most difficult to master spiral steel butt weld.
The so-called trachoma: that the welding process on the inside surface of the weld or welds, there has not been a thorough penetration of particles or bubbles, as well as the shape of the sand pit in the surface of the weld. The reason for trachoma are the following:
1, the supply of the welding torch during the current is too small, the capacitor is too short, the capacitor has not been completely thorough when welding the welding surface has been hardened, so there occurs a penetration of sand or not bubbles.
2, scimitar tune into the strip-shaped curvature of the time there is no good butt, butt strip does not match exactly, there has been too much of a gap between the butt strip.
3, butt welded steel when the two sides have not cleared up the edge of the strip rust or scale.
4, there is no timely maintenance of production equipment to clean up. Workbench dust or dirt, mistakenly fall into the gap at the butt welding of steel.
5, the operating temperature is too low or too wet workshop, which affects the temperature and dryness of welding points.
The so-called trachoma: that the welding process on the inside surface of the weld or welds, there has not been a thorough penetration of particles or bubbles, as well as the shape of the sand pit in the surface of the weld. The reason for trachoma are the following:
1, the supply of the welding torch during the current is too small, the capacitor is too short, the capacitor has not been completely thorough when welding the welding surface has been hardened, so there occurs a penetration of sand or not bubbles.
2, scimitar tune into the strip-shaped curvature of the time there is no good butt, butt strip does not match exactly, there has been too much of a gap between the butt strip.
3, butt welded steel when the two sides have not cleared up the edge of the strip rust or scale.
4, there is no timely maintenance of production equipment to clean up. Workbench dust or dirt, mistakenly fall into the gap at the butt welding of steel.
5, the operating temperature is too low or too wet workshop, which affects the temperature and dryness of welding points.
2019年2月13日星期三
Welded steel tube used for conveying low - pressure fluid
Welded tube is using the materials, such as steel belt or plate stuff, as the steel pipe joint on the surface, which makes the welded can bend into round or triangle shape. That makes the tube shape. Welded steel pipe is formed in 1.0m for the pipe diameter and more than 10mm thick from the steel plate. In the industrial field, we can see lots of application of this welded steel pipe is being used, such as shipment delivery and the basic structural materials for building and factories, etc. Therefore, lots of customers can are satisfied in meeting this pipe. They can ask for special requirements on the quality, specifications and even the size. More originally, we are using this pipe in transporting gas, liquid and even the heating. We are using them in delivering water through the country and providing necessity for the resident.
We can divide the welded steel pipe into three main types, the high, the low and the gas tube. Those are evidenced by their different methods. Moreover, we still can see some minority types, such as the furnace pipe.
Making the welded tubes is simpler than other types, like the seamless steel pipes and black steel pipes. Thereby, the manufacturer has high efficiency. Since one hundred year ago, the development of the kind of pipes makes it possible to improve its quality and specifications like the lengths and diameters. Flat products such as plate and sheet are the original materials in making welded tubes. After certain degree compression and temperature, it can make it into desired shape. Basically, manufacturers would like to make it round shape, since it is good for transporting, especially for those low-temperature liquid. Once this outer shape is made, weld joint are used to combine each part together. High energy are needed at the same time, since this process need power to squeeze and form. Customers and buyers are provided more choices as the increasing number of pipes. According to different making process, this type can be divided into two main forms---the spiral welded pipe and longitudinal pipe. For the advantages, simple procedure is the first one, then various types are the second since customers can choose their specific types. What's more, equipment investment is quite low, while the general strength less than seamless steel tubes.
In the case of high pressure and vibration, steel pipe are especially helpful since their resistance. They can resist rust, corrosion and fire and therefore, apart from carrying liquid and gas, they can also be applied for fire sprinkler system. Welding steel pipe is under the imposition of government and the quality of the pipe must meet the specified standard. Different pipeline application has different regulations; you need to apply the stringent rules to make sure a safe criterion. Qualified steel pipe works wonder and save trouble to the project and less maintenance in later use. We suggest all the customers to take every important details into consideration before purchasing the pipe.
We can divide the welded steel pipe into three main types, the high, the low and the gas tube. Those are evidenced by their different methods. Moreover, we still can see some minority types, such as the furnace pipe.
Making the welded tubes is simpler than other types, like the seamless steel pipes and black steel pipes. Thereby, the manufacturer has high efficiency. Since one hundred year ago, the development of the kind of pipes makes it possible to improve its quality and specifications like the lengths and diameters. Flat products such as plate and sheet are the original materials in making welded tubes. After certain degree compression and temperature, it can make it into desired shape. Basically, manufacturers would like to make it round shape, since it is good for transporting, especially for those low-temperature liquid. Once this outer shape is made, weld joint are used to combine each part together. High energy are needed at the same time, since this process need power to squeeze and form. Customers and buyers are provided more choices as the increasing number of pipes. According to different making process, this type can be divided into two main forms---the spiral welded pipe and longitudinal pipe. For the advantages, simple procedure is the first one, then various types are the second since customers can choose their specific types. What's more, equipment investment is quite low, while the general strength less than seamless steel tubes.
In the case of high pressure and vibration, steel pipe are especially helpful since their resistance. They can resist rust, corrosion and fire and therefore, apart from carrying liquid and gas, they can also be applied for fire sprinkler system. Welding steel pipe is under the imposition of government and the quality of the pipe must meet the specified standard. Different pipeline application has different regulations; you need to apply the stringent rules to make sure a safe criterion. Qualified steel pipe works wonder and save trouble to the project and less maintenance in later use. We suggest all the customers to take every important details into consideration before purchasing the pipe.
Technical development of welded steel tubes
Nearly all pipe making involves the welding process. The techniques in dealing with this procedure in most cases determine the difference between a hack job and good craftsmanship. The steels used in the making of welded steel pipe are far more sophisticated than those in the 1980s and 1990s. More kinds of steel alloys marked with outstanding physical and chemical properties have been invented and applied in a whole range of projects. For example, a stainless steel alloy is primarily made of iron with a substantial amount of chromium and nickel added during the alloying process. The most notable type of corrosion-resistant stainless steel alloy is widely used by architects to be applied in environments with high moisture. In addition, the heat treatments and the melting process have been dramatically upgraded. Thanks to the technological development of welded steel pipe, steel pipe manufacturers are capable of creating development welded steel pipes that are precisely crafted to meet customers' demands.
There are various kinds of welded steel pipe. ERW steel pipes are generally cold formed and can be made by the means of spot welding and seam welding in a variety of lengths and thickness. As a matter of fact, both methods involve the use of electrical energies to hold the melting steel together, hence the name of ERW steel pipes. Besides, such factors as the heating temperatures, the chemical compositions of electrode geometry, and the physical properties of the steel all have certain influence on the welding results. Thanks to the versatility of the ERW steel pipes, they are widely used in the underground piping projects and you may also find ERW steel pipes in such places as warehouses and hospitals.
On the other hand, in comparison with coating steel pipe, fusion welded steel pipes have different manufacturing methods and applications. Generally speaking, fusion welded steel pipes are often used to transport fluids such as water in agricultural projects and chemical plants. Made of coiled steel that is joined one after another, fusion welded steel pipes are sent into a furnace to get welded. The good news is that fusion welded steel pipes can be manufactured from the mixture of steel alloy and a wide range of less expensive metals, depending on the customers' requirements. What is more, marked with appealing aesthetic features, spiral welded steel pipes are frequently used in construction projects to add to the geometric styles of the buildings. And it is relatively easy to install spiral welded steel pipes because thanks to the curvy shapes, less joints and hangers are needed in the installation. Moreover, with a smooth interior, the spiral welded steel pipes can also be used to transport gas or fluids as the special shape can helps reduce leakage and relieve the pressure on the pipe walls. In chemical production practice, spiral welded steel pipes not only helps to reduce the amount of toxic pollutants but also collects the useful byproducts.
There are various kinds of welded steel pipe. ERW steel pipes are generally cold formed and can be made by the means of spot welding and seam welding in a variety of lengths and thickness. As a matter of fact, both methods involve the use of electrical energies to hold the melting steel together, hence the name of ERW steel pipes. Besides, such factors as the heating temperatures, the chemical compositions of electrode geometry, and the physical properties of the steel all have certain influence on the welding results. Thanks to the versatility of the ERW steel pipes, they are widely used in the underground piping projects and you may also find ERW steel pipes in such places as warehouses and hospitals.
On the other hand, in comparison with coating steel pipe, fusion welded steel pipes have different manufacturing methods and applications. Generally speaking, fusion welded steel pipes are often used to transport fluids such as water in agricultural projects and chemical plants. Made of coiled steel that is joined one after another, fusion welded steel pipes are sent into a furnace to get welded. The good news is that fusion welded steel pipes can be manufactured from the mixture of steel alloy and a wide range of less expensive metals, depending on the customers' requirements. What is more, marked with appealing aesthetic features, spiral welded steel pipes are frequently used in construction projects to add to the geometric styles of the buildings. And it is relatively easy to install spiral welded steel pipes because thanks to the curvy shapes, less joints and hangers are needed in the installation. Moreover, with a smooth interior, the spiral welded steel pipes can also be used to transport gas or fluids as the special shape can helps reduce leakage and relieve the pressure on the pipe walls. In chemical production practice, spiral welded steel pipes not only helps to reduce the amount of toxic pollutants but also collects the useful byproducts.
How to use steel pipes in buildings
You should know that API steel pipe play an important role in the construction of a lot of building types. The most normal places to see steel pipes used in buildings are in the bases of tall buildings, you should know the handrail of many kinds of balconies and stairs, the staging when making the building and the shell of many types of buildings. They are usually used to make storage things. If a people takes the time to look for them, he will see that a lot of steel pipes are used in places all of the time.
Features
API Steel pipe is one of the very good pieces of tool out there. They can be made in almost any size, from less than 1 inch to over 5 feet. They can be made in many kinds of plies. Steel pipes can also be bent into many kinds of different shapes, such as curves, rulers and even squares. This makes them many kinds of use and very good for many different tasks.
Function
There are a lot of different good things for steel pipes in construction. One of the very good uses for steel pipes is in the making of buildings. In a lot of cases, a lot of steel pipes are used to brace the deep bases of higher buildings. They are also used to make more recent buildings, such as many good structures. Another make for steep pipes is to make greenhouses. A lot of steel pipes can easily be made to the ideal greenhouse shape. In some cases, steel pipes are used to make entrepot and similar building kinds.
Geography
You should know that one of the best uses of steel pipes in making is to aid the movement of tool across precarious ground. A lot of common parts of the global have less than very good surface conditions for making. Steel pipes help make a very good surface that keeps tool and tools from making stuck in the place.
Benefits
Steel pipes are very good for you. One of the good points to use API steel pipe is that because they can be taken for a lot of different tasks, a plant or place can survive off of just their making. You should know that this very good smaller place to save money on tool that is made to create very good in their company. The steel pipes can be used in a lot of places. Another good use to using steel pipes in places is that they last longer than a lot of building materials. They are also counteractive to adverse weather conditions and stand up well in cyclone, a lot of earthquakes, and a lot of tornadoes.
Potential
Since use API steel pipe are very good and used well in buildings and other making goals, it is likely that you should know they will being used all the time. A lot of steel pipes may also begin to be made in the innovation of some not new places and in the making of buildings in some not rich countries. A lot of buildings in othe
Features
API Steel pipe is one of the very good pieces of tool out there. They can be made in almost any size, from less than 1 inch to over 5 feet. They can be made in many kinds of plies. Steel pipes can also be bent into many kinds of different shapes, such as curves, rulers and even squares. This makes them many kinds of use and very good for many different tasks.
Function
There are a lot of different good things for steel pipes in construction. One of the very good uses for steel pipes is in the making of buildings. In a lot of cases, a lot of steel pipes are used to brace the deep bases of higher buildings. They are also used to make more recent buildings, such as many good structures. Another make for steep pipes is to make greenhouses. A lot of steel pipes can easily be made to the ideal greenhouse shape. In some cases, steel pipes are used to make entrepot and similar building kinds.
Geography
You should know that one of the best uses of steel pipes in making is to aid the movement of tool across precarious ground. A lot of common parts of the global have less than very good surface conditions for making. Steel pipes help make a very good surface that keeps tool and tools from making stuck in the place.
Benefits
Steel pipes are very good for you. One of the good points to use API steel pipe is that because they can be taken for a lot of different tasks, a plant or place can survive off of just their making. You should know that this very good smaller place to save money on tool that is made to create very good in their company. The steel pipes can be used in a lot of places. Another good use to using steel pipes in places is that they last longer than a lot of building materials. They are also counteractive to adverse weather conditions and stand up well in cyclone, a lot of earthquakes, and a lot of tornadoes.
Potential
Since use API steel pipe are very good and used well in buildings and other making goals, it is likely that you should know they will being used all the time. A lot of steel pipes may also begin to be made in the innovation of some not new places and in the making of buildings in some not rich countries. A lot of buildings in othe
A new method for measuring the wall thickness of welded steel tubes
This device consists of a measuring head of laser ultrasonic measuring equipment, a motivating laser, an irradiating laser and a convergence optical element that is used to collect lights reflected from the surface of the pipe to the measuring head. The important mass parameter for pipe production is wall thickness. So it is needed to measure and monitor its parameter in the course of pipe production. You should create a laser ultrasonic survey to measure the wall thickness of the welded steel pipe .It is a measurement method which is based on pulse echo principle to ensure the wall thickness through measuring the spreading time of ultrasonic pulse.
This device uses a motivating laser that will lead ultrasonic pulse into the surface of the pipe. And then this ultrasonic pulse spreads into the pipe and reflects on the inner wall. And we could measure the signal that return to the outer wall through putting an irradiating laser aiming to the surface of the pipe. This reflected signal will be sent into an interferometer where there is a homocentric interferometer. A analysis and process device makes sure the time difference between input ultrasonic signals and reflected ultrasonic signals to figure out the wall thickness value under the circumstances of having known the spreading speed in the pipe.
In order to make this device measure the wall thickness of welded steel pipe accurately and stably, it is necessary to make laser ultrasonic measurement device work under the best working condition. And its prerequisite is that the light beam sent out by motivating laser and the light beam sent out from the irradiating laser must meet on the assigned place. However, first of all, we must try our best to keep accurately the distance between measuring pipe and measuring head. In addition, practices have proved that it is hard to ensure the best working condition under above environment situation, especially in the process of rolling, impossible to adjust the laser ultrasonic measurement device. And this can only be made through the regular control of the device. Otherwise, the distance between measuring head and the surface of the pipe of the laser ultrasonic measurement device must be kept in an ideal index value to make sure the reflected laser light from the surface of the pipe could best input the measurement device.
Set at least two light resources that send the same one bundling light and are fixed on the different places of the measurement head. And at least two light resources can be foxed on the measuring head like this and be corrected direction. Namely when there is a beforehand distance of pipe and measuring head, the bundling lights from these two light resources will cross on the surface of the welded steel pipe. No matter how long the distance between the head and the surface, you can easily measure with the method above. Thus, it can be sure that the laser ultrasonic measurement device has best working condition under the rough rolling condition, enhancing the productivity as well as quality of the welded steel pipe.
This device uses a motivating laser that will lead ultrasonic pulse into the surface of the pipe. And then this ultrasonic pulse spreads into the pipe and reflects on the inner wall. And we could measure the signal that return to the outer wall through putting an irradiating laser aiming to the surface of the pipe. This reflected signal will be sent into an interferometer where there is a homocentric interferometer. A analysis and process device makes sure the time difference between input ultrasonic signals and reflected ultrasonic signals to figure out the wall thickness value under the circumstances of having known the spreading speed in the pipe.
In order to make this device measure the wall thickness of welded steel pipe accurately and stably, it is necessary to make laser ultrasonic measurement device work under the best working condition. And its prerequisite is that the light beam sent out by motivating laser and the light beam sent out from the irradiating laser must meet on the assigned place. However, first of all, we must try our best to keep accurately the distance between measuring pipe and measuring head. In addition, practices have proved that it is hard to ensure the best working condition under above environment situation, especially in the process of rolling, impossible to adjust the laser ultrasonic measurement device. And this can only be made through the regular control of the device. Otherwise, the distance between measuring head and the surface of the pipe of the laser ultrasonic measurement device must be kept in an ideal index value to make sure the reflected laser light from the surface of the pipe could best input the measurement device.
Set at least two light resources that send the same one bundling light and are fixed on the different places of the measurement head. And at least two light resources can be foxed on the measuring head like this and be corrected direction. Namely when there is a beforehand distance of pipe and measuring head, the bundling lights from these two light resources will cross on the surface of the welded steel pipe. No matter how long the distance between the head and the surface, you can easily measure with the method above. Thus, it can be sure that the laser ultrasonic measurement device has best working condition under the rough rolling condition, enhancing the productivity as well as quality of the welded steel pipe.
What are the precautions for casing
The casing pipe is used to support the steel pipe of the oil and gas well wall to ensure the normal operation of the entire oil well after the drilling process and completion, and the role is to fix the oil and gas oil well wall or the well hole, then what are the use? What about the matters?
1. First of all, we must do a good job in achieving water quality standards and strict water quality monitoring and management. The decontamination and re-injection shall be carried out to strengthen the cleaning work of the main water pipeline, so that the water quality in the station and the bottom of the well can be achieved, and the corrosion source is reduced to be introduced into the annular space.
2. For the injection wells that have been newly put into operation, take the annulus protection liquid mainly based on dosing and sterilization, and form a system to regularly add.
3. In view of the acceleration of the corrosion of the oil casing by mechanical abrasion, it is recommended to add a rubber ring to the tubing coupling or add a centralizer to the serious part of the well.
4. In case of serious bacterial corrosion under scale and slow growth and killing of SRB at high temperature, 100 °C high temperature water or water vapor can be injected into the annulus periodically to kill SRB under the scale.
5. It is not recommended to promote the use of cathodic protection and atlas casing before the corrosion in the casing of the injection well is not effectively controlled.
The casing pipe is different from the oil pipe of the high pressure oil pipe manufacturer. I hope everyone can understand this. It is generally divided into a condui, a surface casing, and a technical casing.
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1. First of all, we must do a good job in achieving water quality standards and strict water quality monitoring and management. The decontamination and re-injection shall be carried out to strengthen the cleaning work of the main water pipeline, so that the water quality in the station and the bottom of the well can be achieved, and the corrosion source is reduced to be introduced into the annular space.
2. For the injection wells that have been newly put into operation, take the annulus protection liquid mainly based on dosing and sterilization, and form a system to regularly add.
3. In view of the acceleration of the corrosion of the oil casing by mechanical abrasion, it is recommended to add a rubber ring to the tubing coupling or add a centralizer to the serious part of the well.
4. In case of serious bacterial corrosion under scale and slow growth and killing of SRB at high temperature, 100 °C high temperature water or water vapor can be injected into the annulus periodically to kill SRB under the scale.
5. It is not recommended to promote the use of cathodic protection and atlas casing before the corrosion in the casing of the injection well is not effectively controlled.
The casing pipe is different from the oil pipe of the high pressure oil pipe manufacturer. I hope everyone can understand this. It is generally divided into a condui, a surface casing, and a technical casing.
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