Magnetic Pig Suppliers

Description

Shenyang EMT Piping Technology Co.,Ltd., are Magnetic Pig Suppliers. Magnetic pig is a kind of pipeline pigging device. Its structure is simple. Butterfly shaped cups or support plates are arranged on the metal skeleton of the pig. At the same time, it has pigging components composed of base plate and sealing straight plate. High strength permanent magnetic steel is fixed on the metal framework of the pig through the installation base. There are also steel brushes on its metal skeleton. This product uses the above structure. The butterfly-shaped cup and straight sealing plate can meet the requirements of conventional pigging operation. There are rust, welding slag and other metallic impurities in the pipeline.

Magnetic Pig Suppliers

Moreover, it can be effectively carried out of the pipe by the pig. The steel brush installed on the metal framework can remove rust, welding slag, welding rod and other sundries on the inner wall of the pipeline. The pig has the conventional cleaning function of ordinary pig. It also has the function of strongly adsorbing metallic impurities. It is most suitable for pigging, natural gas and product oil pipeline online.

Background technology:

In recent years, the domestic pipeline integrity management requirements have been continuously improved. This requires that the pipeline be cleaned of impurities on a regular basis. During the operation and maintenance of the pipeline, ferromagnetic impurities are often deposited. Ferromagnetic impurities gather at the bottom of the pipe. This will increase the risk of corrosion inside the pipe. We can usually use mechanical magnet cleaner to clean the impurities inside the pipeline.

Therefore, the passing risk of pig is high. The operator cannot even use a mechanical magnet cleaner for cleaning. This leads to the accumulation of ferromagnetic impurities. Meanwhile, during daily operation, maintenance and pigging. Under the condition of high-speed operation, the mechanical magnetic pig has a weak ability to carry ferromagnetic impurities. Moreover, the pigging efficiency is low. This brings great challenges to the safe operation and maintenance of the pipeline. Therefore, it is necessary to design a pigging device with good trafficability and high efficiency in removing ferromagnetic impurities. Under the condition of ensuring the safety of pigging operation, it can achieve high-efficiency pigging. And this can reduce the impact of ferromagnetic impurities on the pipeline.

 Type of The Cleaning Pig 

There are many kinds of pigs commonly used in long-distance natural gas pipelines. Such as pigging balls, polyurethane foam pigs, mechanical pigs, smart pigs (magnetic flux leakage detection pigs). There is also an isolation-type pig that reduces the amount of mixed oil that is sent sequentially.

1.1 Pigging ball

It is hollow inside. The wall thickness is 10% of the pipe diameter (30~95 mm). The operator controls the amount of water injected through the one-way valve of the water injection vent hole on the pigging ball. This can further control the interference of the pigging ball. The pigging ball is mainly to remove the fluid in the pipe and the separation medium. It includes the isolation of different oil products in the sequential delivery of oil products.

There is also the removal of air in the pipe during the hydrostatic test of the pipe. The disadvantage of the pigging ball is that it has poor ability to remove lumps and dust. Such as the tee whose diameter of the branch pipeline is greater than 1/2 of the diameter of the main pipeline. Or use an equal diameter tee. At the same time it has no protective bar. This can easily cause ball jamming.

1.2 Polyurethane foam pipe cleaner

The length of the polyurethane foam pig is 1.75~2 times the pipe diameter. The interference is generally 25mm or 5%~10% of the pipe diameter. It has high elasticity, toughness and certain wear resistance. It deforms more than 50%. The foam pig has a strong passing capacity. It fits easily through bends. It can rely on its high deformation performance to pass even if it gets stuck. Or we crank up the pressure to make it crack. It can remove the blocked pipe by itself, and no pressure-holding accident will occur. The foam debris of the foam pig does not cause any damage to the inner wall of the pipeline.

So it can clean pipes with inner wall coating. The disadvantage is that the ability to remove debris is average. It is mainly for pipeline water absorption and cleaning. But it is for one-time use only. And the running distance is shorter.

1.3 Mechanical pig

Mechanical pigs do more than just remove fluid in pipes. And it also removes solid impurities. According to needs, users can install steel brushes and scrapers to enhance the pigging effect. Mechanical pigs have a long service life. Generally it can run 800~1000 km. The product can be installed with tracking equipment, caliper plates, magnets, etc. The disadvantage is that the passability is slightly poor. So it is not suitable for multi-elbows, valves and pipes with large deformation. The mechanical pigs used in domestic pipelines are mainly dish-shaped leather bowl pigs and two-way straight plate pigs. The interference of the disc-shaped cup cleaner is generally 3% to 5% of the pipe diameter. Its passing capacity is better than that of two-way straight pigs.

The leather bowl pig runs in a fixed direction in the pipeline. It is mainly used to remove liquid, dust, and other dirt in the pipeline. The cleaning ability of the two-way straight plate pig is better than that of the cup pig. In particular, it can effectively remove suspended dirt in the pipeline. Compared with saucer cups, it wears faster and runs for a shorter distance. There is better pigging efficiency in short-distance pipe sections. The straight pipe pig can move in both directions. When the pipeline is put into production or the pipeline is not pigged for a long time. In case of clogging, it can be blown back to remove the clogging.

1.4 Diameter pig

Caliper pigs measure parameters such as pipe geometry, ovality, roughness and weld penetration. It provides raw basic data on pipeline conditions. This provides the basis for pipeline repair and pigging. The diameter of the caliper pig is about 60% of the pipe diameter. Moreover, the cup is flexible and can pass through 15% of shrinkage holes. The key technologies of the caliper pig are speed control, detection accuracy, reliability, and post-data processing and analysis. Caliper pigs should be launched before smart pigging (in-pipeline detection). Because it is necessary to determine the internal condition of the pipeline. Only in this way can the passing capacity of the pipeline be detected.

1.5 Intelligent Pipe Cleaner

Intelligent pigs include data acquisition sensors, support systems, drive systems, cups (steel brushes), probes, power systems, and signal processing systems. Its length is 4~5 times that of ordinary pigs. In order to make the inspection in the pipeline go smoothly, the user launches the ordinary pig to clean the pipeline before launching the smart pig. Then launch the caliper pig again. This allows the internal condition and capacity of the pipe to be determined. The pipeline information collected and determined by the smart pig includes pipeline geometric deformation measurement. There is also information on pipe dents, wrinkling, ovality, bend radius, and more. Pipeline metal loss, wax deposits, and extent of corrosion. There are also pipeline crack defect locations, area and severity.

Cleaner selection basis

Pig selection is a multi-objective and multi-factor decision-making problem. We mainly need to determine the mechanical strength, wear resistance, adsorption, reactivity and passing capacity of the transport medium in the pipeline. details as follows:

1) Pigging goals.

Whether the pipeline is cleaned of liquid or solid impurity dirt, predict the amount of dirt. As expected, there are more sediment impurities. Natural gas pipelines can choose pigs with discharge holes. Gas blows the sand through the weep holes to avoid clogging.

2) Pipeline lifecycle phases.

New pipelines are cleaned of residues, preliminary measurement, pressure test, drying, and trial operation. Running piping is clean of wax deposits and dirt, media isolation, corrosion inhibition. Pipeline shutdown and scrapping are medium removal and inert gas filling.

3) Determine the characteristics of the driving medium (oil, water, gas) for pigging.

4) The interference of the pig.

Consider the minimum bending radius and bending angle of the pipeline, the minimum and maximum inner diameter, branch pipeline connections, and elevation changes along the line. And the type, location, size, etc. of valves/tees/elbows along the line.

5) Pigging process.

The driving pressure range value provided by the pipeline (the maximum allowable operating pressure of the pipeline, the operating pressure of the pipeline, and the change of temperature parameters). As well as the range of possible speed values for pig operation and the maximum distance the pig needs to travel.

6) Dimensions of steel brushes and scrapers for pig installation.

Consider comprehensively the thickness of the wax deposit in the pipeline and the driving force range.

7) The mechanical strength, wear resistance and reactivity of the pig in contact with the medium in the pipeline.

The development trend of pigs is to adapt to the pigging requirements of long-distance station intervals. This has higher requirements on the configuration of the pig’s cup, the strength of the cup and the quality of the transmitter.