In the large-scale LNG modular construction process, there are often some large-diameter pipe diameters, which cannot be cut by fixed machine tools, but the manual cutting and the quality of the groove are poor, and the cutting of one port takes too long, which affects the progress of the project and the progress of the project. In this paper, the LNG process is used to treat the pipe gallery, and the modular construction of the transportation project is the background. The emphasis is on the application of the portable pipeline cutting beveling machine to the pipeline cutting and beveling technology to solve the technology of large-scale pipelines and on-site finished cutting groove construction. problem.
The portable pipeline cutting beveling machine is a sectional annular cutting machine with simple structure, simple operation, convenient application, high efficiency and quickness, high cutting quality and high accuracy. This portable line cutting beveling machine can be driven by pneumatic, electric and fully enclosed hydraulic systems, making it ideal for use in harsh environments (sand sand, sludge, underwater) for offshore drilling, pipe laying and various water installations. The pipe to be cut is fixed in the “self-centering typeâ€, the pipe will not be deformed, and the cutting speed can be quickly adjusted according to the pipe diameter. The automatic cutter head is wound around the pipe during cutting, and the pipe is cut by a rotating cutter. No burr, no deformation, vertical vertical cut and high accuracy.
1 Portable Pipe Cutting Beveling Machine in Pipeline Construction Engineering Portable pipe cutting beveling machine is designed with ring-shaped outer card structure, which can be applied to narrow space and easy to install and disassemble. Specially designed transmission mechanism can be subjected to high-strength cutting equipment with long service life, optional pneumatic, electric motor can meet different needs, patented unique design can eliminate shaft clearance wear, maintain smooth operation and high precision, designed for natural gas transportation, Designed for large-diameter pipeline installations in nuclear power, oil, natural gas, and boiler industries. The portable pipeline cutting beveling machine performs complete cold cutting without destroying the pipe material, and the cutting groove has high precision and is formed at one time. As shown.
Portable line cutting beveling machines range from miniature to HD for a wide range of pipes from 1/2" to 177", enabling cutting, beveling, section cutting, boring and boring of pipes of various materials and wall thicknesses External turning.
The following is a combination of the application of the portable pipeline cutting beveling machine in the LNG modular construction project, and the application of each stage of the pipeline construction process is described in detail.
1.1 Prefabrication stage of the pipeline Prefabrication stage requires the pipe material to be segmented and grouped into a single pipe. In order to ensure high working efficiency, it is necessary to accurately cut the straight pipe length along the length direction and minimize the grinding time of the end groove. It is well known that for the section of flame cutting and plasma cutting, the end face treatment and the groove are polished, and the smoothness, smoothness and angular precision of the polished slope are poor, time-consuming and labor-intensive; the portable pipeline cutting beveling machine is convenient. Quickly cut out the groove surface, forming once, avoiding sanding, saving manpower and time, and being unanimously affirmed by the owner and the quality control department.
The portable pipeline cutting beveling machine can complete the pipe cutting of larger pipe diameters when ordinary equipment cannot be cut, as shown. The cut groove surface is smooth, the groove angle is accurate, and it is formed once and avoids sanding.
In the case of space constraints during prefabrication, installation or repair, portable pipeline cutting beveling machine can also be used to ensure certain key points during the installation phase of the pipeline and the accuracy of the pipeline after installation. The coordinates of the adjacent straight pipe segments of the key points need to be adjusted or the margin reserved in advance. In order to avoid the use of on-site flame cutting, the wear time is long, the precision control is difficult, the groove quality is poor, the damage caused by splashing Mars to the pipeline coating system and the impact on other construction operations, or the pipeline is avoided, and returned to the workshop. The adjustment can be carried out by using a portable pipeline cutting beveling machine to process the end of the pipeline at the working site, which is convenient, quick and meets the quality requirements, optimizes the working mode, and saves manpower, material resources and time resources.
After the completion of the modular construction project and before the acceptance, it is necessary to cut off the pressure test margin reserved at the end of the pipeline. The quality control department needs to measure the installation accuracy of the HOOK-UP point at the boundary of the module and the end of the pipeline to ensure HOOK- The coordinates of the UP point are within the tolerance control range, and the groove angle and surface smoothness are in accordance with the relevant technical requirements. When cutting flame or plasma cutting, it is necessary to leave a margin for grinding, which is difficult to reach the required control range. Other cutting methods are inapplicable in terms of operation space, operation difficulty and safety. The portable pipeline cutting beveling machine can meet the requirements of operation space, operation safety and ease of use, and is suitable for modification and adjustment on site.
1.3 Operational phase maintenance The portable pipeline cutting beveling machine is not only suitable for pipeline construction, but also suitable for maintenance, adjustment and emergency rescue construction in project operation. It does not produce sparks during the cutting process as follows: During operation, the operator must not leave the post without authorization. Once the pipe cutting beveling machine works abnormally, it should be immediately shut down for maintenance and can be used after returning to normal.
If a stuck knife phenomenon occurs during the cutting process, immediately press the feed motor emergency stop button (turn off the motor switch immediately during manual feed), stop the groove feed, exit the blade, and resume normal operation before cutting.
Wear protective goggles, safety gloves and earmuffs when using a pipe cutting beveler.
Never touch the rotating blade while the machine is running to avoid injury.
Pay attention to the position of the power cable when the machine is running, and ensure that the power cable does not touch the blade and the rotating part to avoid damage.
Prevent the blanking material from cutting the power cable after cutting.
It is not allowed to use ordinary coolant. You should use the special cooling paste provided by the company, otherwise the motor will leak or be damaged.
Be careful to turn off the power when replacing the blade, cleaning, repairing, and maintaining the pipe cutting beveling machine.
Do not use in wet, rainy, flammable or explosive environments.
3 Advantages of Portable Pipeline Cutting Machine Engineering Application The practical application of portable pipeline cutting machine in LNG modular construction project fully demonstrates its advantages: light weight, light and easy to carry, unique in large-diameter pipe field cutting Advantage.
The neck-mounted adjustable bearing and the reinforced bottom bearing race combine to maximize reliability and operational functionality.
The compact, split-type fuselage structure allows for clamping and cutting in any part of the pipe and in a small space with a single-sided gap of not less than 80 mm.
The fixing system can easily hold the pipe to be processed.
The requirements for the fastening components are simple and can be adjusted with only one wrench.
High security. The machining process is purely mechanical and does not produce sparks.
The tool rotates under the static condition of the pipe, and the nozzle cutting and beveling can be completed at the same time. The processing quality is good, and the processing of the same type of pipe fitting is about twice as short as that of the imported machine.
The incision is not deformed, burr-free, and always clean.
Power is equipped with multiple options. It can be equipped with different voltage motors or engine drives in different regions and environments, and can also be used for field operation in the field without power configuration.
Remote control and overload protection are provided for hydraulic drive, which is highly safe. Use the quick connector to connect to the hydraulic station, plug and play, convenient and fast. Large output power, adjustable speed, no noise, suitable for explosion-proof occasions, the maximum processing wall thickness is 100mm. The electric drive adopts two forms: conventional motor and servo motor. Fast response, large overload capacity, wide speed range, low speed torque, small fluctuation, stable operation, maximum processing wall thickness 45mm. Low working medium cost when pneumatically driven, no pollution, maximum processing wall thickness 25mm. For cutting Sanitary stainless steel clean pipe is the best choice for direct welding of stainless steel pipe after cutting in beer, beverage dairy, pharmaceutical, daily chemical, semiconductor optoelectronics, biological, chemical, oil and gas, water treatment, shipbuilding, electric power, etc. The groove can also be completed at the same time, with high efficiency and good quality.
The application of portable pipeline cutting machine in offshore petroleum engineering and LNG modular construction engineering shows that it is beneficial to optimize the engineering construction method, so that many modules connected in the process are connected in order, and production can be carried out to a certain extent. Assembly, simulation site construction, as shown. Therefore, relevant equipment, performance testing and integrity debugging of the process system can be carried out at the construction site, problems can be found in time, local solutions can be solved, and subsequent faults at the production site can be reduced. After completion, the whole segment is transported to the project construction site for assembly, and the engineering construction level is further innovated and optimized. 131. On-site construction problems and treatment measures Portable pipeline cutting beveling machine In the application practice of LNG modular construction project, the following types usually appear. The problem, after discussion with manufacturers and professionals, has formed corresponding solutions, as described below.
4.1 Elliptical pipeline cutting In the actual construction process, the pipeline is often not rounded. Therefore, some parts have been cut during cutting, and some parts have not been cut to the end. As shown, the cutting head and the clamping knife will appear when cutting continues. The phenomenon of damage. The manufacturer has given corresponding solutions to this kind of pipeline defect: install the magazine holder on the rotating tool holder, which can maintain a certain pressure with the surface of the tube, rotate close to the outer wall of the tube, and make reasonable calculations through accounting. The feed amount is solved, thereby solving the cold cutting problem of the pipeline ellipse and achieving a satisfactory cutting effect.
4.2 Cutting off the rebound Sometimes a pipeline that needs to be cut in the middle of a pipeline system. For example, after the joint construction of the ICHTHYS project, in order to avoid the risk of cross-section misalignment rebound, damage to the tool or cutting equipment due to pipeline stress during the connected pipeline or operation maintenance pipeline between the modules, cutting equipment assistance may be provided. Support, fix the sides of the cut-off port as shown.
The pipe-retaining knives of the restricted road return are both tightly sealed, and the front wheel surface is provided with a bad 1 table to indicate the anti-rebound device of the external bulge. 3 The maximum loss gap is 3mm. The actual cutting loss is usually 56mm. If the project has special requirements, some projects require high requirements. For example, the ICHTHYS project requires a maximum loss of 3mm between modules due to joint construction, so special custom tool tips are required. A high-strength cutter head with a width of 3 mm meets this special requirement.
4.4 Stainless steel pipeline cutting For stainless steel pipeline cutting, in order to avoid cross-contamination between carbon steel cutter head and non-pound steel pipe line, after research and discussion with manufacturers, avoid cross-contamination from tool selection, and give corresponding solutions: Cutting with a high-strength alloy steel cutter head.
5 Conclusion The application of the portable pipeline cutting beveling machine in the LNG modular construction project fully demonstrates its advantages in engineering applications, such as optimizing construction methods and improving construction efficiency. It has brought considerable economic benefits to the company and is expected to become an indispensable tool for a wide range of pipeline construction projects.
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