Magnetic pig

Description

Magnetic pipeline pig

Pipeline magnetic pig is a mechanical pig equipped with strong magnets. He can clean the iron filings from the pipe. At the same time, it can also help to position the pig in the pipeline. If the space of the pipe is also very limited. It can also be molded into a polyurethane pig or a disc molded into polyurethane.
Magnetic pig has many uses. Among them, its main purpose is to collect iron-containing debris inside the newly put into the production pipeline. Such as welding rods, weld slag, mill scale and rust. It can also carry out continuous cleaning activities. They can also activate electromagnetic equipment on the pipeline. For example, valve, annunciator, and switch. So if you want to know more about Magnetic pig, please contact our professionals to answer them for you.

There are many reasons for using this magnetic pig in the industry:

1. Easy-to-operate valves
2. It is convenient for operators to operate magnetic non-invasive pig annunciator detection equipment
3. Iron filings can be removed from the pipe
4. Generally, the pig that can operate the valve is in the small-diameter pig

Pigs used to operate valves are usually connected to small-diameter pigs. In the food industry, workers use it to open or close valves in the manufacturing process. They also often appear in the soft drink industry. Because it can open and close the valve. So it is very convenient to switch from one process to another.

And the corresponding magnetic pig annunciator detection equipment can detect the change of the magnetic field. And it can also be looking for changes in the magnetic field for pig operation. Magnets for this purpose can be glued to polyurethane cups on smaller-diameter pigs. Or we can directly install it on the main body of the pig.

The operator shall always consider the design, power, position and direction. They need to provide as high a Gauss / magnetic field as possible. This ensures that its magnetic field is most easily detected. The magnets used for this purpose are usually neodymium iron boron rare earth composite magnets. The characteristic of this kind of magnet is that it can be very small. But its magnetism is very strong. It is important to remember that the magnet is not installed in the main body of the carbon steel pig. Because the carbon steel pig body will cover the magnetic field generated by the magnet. This will minimize its power.

If they are installed on the main body, they shall be installed on the rear vane of the pig. Therefore, it protrudes from the back or is directly installed outside the pig body between the installation flanges.

Accessories Details

The only time they can be installed inside the valve body is if the valve body is made of stainless steel, because stainless steel and carbon steel do not have the same shielding effect because it is alloy. So it is not iron. Note: when the electromagnetic transmitter is installed in the pig body. Workers should also take this into account. Because the same design phenomena are related.
The magnetic pig is used to remove iron debris from the pipeline. In this case, if the magnet is connected to the pig’s body. The effect will be better. Because magnets are more effective in collecting debris. When space is very special. Especially in small-diameter pigs less than 12 inches. Workers can mold neodymium magnets into polyurethane gaskets on small-diameter pigs.

At the same time, workers need to pay attention during operations. When the magnet is too close to the pipe wall. At this time, the pig center between the steel installation flanges may be compacted by iron debris. This may cause the pig to get stuck in the pipeline.

Similarly, before designing and manufacturing the pig. It is important to know all the details of the pipeline. Steel brushes can be used in combination with magnets. This helps remove iron debris from the pipe wall. Workers can then use magnets installed on the pig to collect the generated iron debris.

Magnetic pig

Whether it is a water pipe, a sewer pipe, or an oil pipeline. Any pipe is the same. If we don’t pay attention to cleaning in time. Impurities will accumulate on the pipe wall. This causes the flow rate to drop. In turn, it affects the discharge of sundries. Such a vicious cycle will lead to corrosion and even blockage. Oil and liquefied gas will never be cleaner than our blood. But those pipelines frequently cross plains, cross national borders and cross the seabed. Their cleaning work is no easier than cleaning human blood vessels. In addition to the cleaning work, the pipeline also needs to be regularly checked for safety. We can nip the hidden dangers in the bud.

To prevent accidental damage and leakage. Our oil and gas pipelines are basically buried underground. Although the pipes are protected against corrosion. Moreover, many tests will be conducted before the pipeline runs. We conduct real-time monitoring and regular patrol. But there are still many factors that can cause accidents.

These hidden dangers are basically divided into three categories:

1. Occupation, insufficient safety distance, and crossing. So everyone already knows. The so-called safe distance is sometimes just a cruel joke. That is, the dangerous goods warehouses are all on the side of the residential areas, and the oil and gas pipelines are invisible things buried underground. So we don’t know how far it is from us. However, in fact, whether it is oil pipeline or gas pipeline. As long as the workers are buried, even leakage and fire are not easy to explode. But if there is crossing and crossing between pipelines. If oil and gas leak into the space, it will be dangerous.
2. Damage caused by construction. Ground construction, random excavation, construction and drilling. This will drill and cut the pipeline.
3. Man made damage. Such as drilling and stealing oil.

The oil pipeline needs to be inspected several times every day. People can walk back and forth to check whether there is leakage, settlement or displacement. Short pipes can be inspected within 2 hours. But most pipelines take longer.

The pig is driven by gas, liquid or pipeline transmission medium (oil, liquid natural gas). It is a special tool for cleaning pipes. They can remove crude oil and sundries inside pipelines in operation. Such as metal chips, floating rust, water, gas, condensate and wax. Or deposits such as scaling, methane hydrate. And corrosive substances such as carbon disulfide and hydrogen sulfuric acid. This will reduce the corrosion damage to the inner wall of the pipeline. It can also redefine the pipeline direction. Detect pipeline deformation. Check the integrity of valves along the line. Reducing the working back pressure, etc.

Pigs are divided into cups and straight plates according to their appearance

Wax scraping; Foam. There are also buckling detectors; Intelligent class, etc.

Functionally, the lower the temperature of crude oil, the easier it is to deposit wax. Wax on the pipe wall can be removed by preparing the most common scraper pig.
The corrosion detection pig uses magnetic or ultrasonic sensors. The magnetic sensor detects corrosion by analyzing the magnetic field change of the metal in the pipeline. The ultrasonic detection pig detects the corrosion through the vibration of the inspected pipe wall. The buckling detector pig can check the shape of the pipeline for bending deformation, etc.

The intelligent pig generally carries a variety of sensors. And a radio transmitting device. Together with ground tracking instruments, they form an electronic tracking system. So it can perform a variety of tasks.

Pig selection basis

Pig selection is a multi-objective and multi-factor decision-making problem. Mainly determine the mechanical strength, wear resistance and adsorption of the pig. As well as the reactivity and throughput of the transmission medium in the pipeline. The details are as follows:

• Pigging target. Whether the pipeline is cleaned with liquid or solid impurities and the amount of dirt is predicted. If it is expected that there are many sediment impurities,. At this time, pig with a drain hole can be selected for the natural gas pipeline. It blows up the sand through the gas of the discharge hole to avoid blocking.
• Pipeline life cycle stage. The newly-built pipeline is used for residue cleaning, preliminary measurement, pressure test, drying and commissioning. The operation of the pipeline is to clean the wax deposition and dirt, isolate the medium and inhibit corrosion. The shutdown and scrapping of pipelines are the removal of medium and filling of inert gas.
• Determine the characteristics of the driving medium (oil, water and gas) for pigging.

Magnetic steel

• Pig interference. Consider the minimum bending radius and bending angle of the pipe, the minimum and maximum inner diameters, and the connection of branch pipes. There are also
• elevation changes along the line and types of valves/tees/elbows along the line. As well as the position and size.
• Pigging process. Drive pressure range value provided by the pipeline. (changes in the maximum allowable operating pressure, operating pressure, and temperature parameters of the pipeline). As well as the possible speed range of pig operation and the maximum distance of pig operation.
• Size of steel brush and scraper for pig installation. It shall be considered comprehensively according to the thickness and driving force range of wax deposits in the pipeline.
• Mechanical strength, wear resistance and reactivity of the pig in contact with the medium in the pipeline.