In order to ensure the safe daily operation of equipment, the welding construction of pipeline construction equipment must be strictly controlled to reduce the probability of problems. However, the power plant will inevitably encounter some problems during operation, and these problems are often caused by operational defects in the welding construction during the installation of pipeline construction equipment. There are also many factors that lead to operational defects in welding construction, such as inadequate installation technology, overtime or insufficient supervision.
Here is the content list:
l Attention and prevention points in welding construction of pipeline construction equipment.
l Factors that cause problems during pipeline construction equipment construction.
l Dealing with welding quality problems of pipeline construction equipment.
Attention and prevention points in welding construction of pipeline construction equipment.
Inadequate operation during welding of pipeline construction equipment will leave hidden dangers to engineering safety. When conducting inspection and acceptance of metal welds, relevant technicians need to be careful, careful, and concentrate on studying and judging, and feedback and solve problems as soon as possible . The existing places where the safety quality does not meet the standards should be immediately compensated to ensure that the unit can continue to operate safely and maintain the original economic costs.
When performing welding operations on pipeline construction equipment, technicians must take professional welding measures. In addition, they must also control the quality of plumbing counterparts. In particular, the quality of joints and arc closing must be strictly controlled by technicians.
Therefore, the weld must not be welded in one layer, but two or more layers must be welded, and the inter-level joints must be staggered by more than 10 mm. In order to be able to deal with the weld bead oxidation site, the internal argon must be in place when the stainless steel pipe is welded. At the same time, technicians must strictly control the temperature between layers, and use water cooling for welding if necessary.
Factors that cause problems during pipeline construction equipment construction.
At the same time, it is necessary to find out which environmental factors will affect the welding work of pipeline construction equipment, especially some special welding methods and welding materials have certain requirements on the environment. For example, alkaline electrodes should be in an environment without water, rust and oil, while argon arc welding should be in an environment without wind, water, rust and oil.
According to the welding conditions of different pipeline construction equipment, corresponding protective measures should be taken to ensure welding. stable quality. The welding of pipeline construction equipment usually involves the connection between the weldment and the counterpart, and the quality of the connection will directly affect the quality of the welding.
In order to clarify their responsibilities, the technicians of pipeline construction equipment must inspect and accept the corresponding weldments before starting welding. For peers with unqualified quality, welding technicians can choose to refuse welding.
Violations of regulations must be dealt with seriously. In addition, during spot welding, due to the unstable welding equipment, corresponding stresses will be generated under normal conditions and defects are likely to occur. It is the weakest place in the entire welded joint. We must let welders with relevant qualifications perform spot welding operations.
Dealing with welding quality problems of pipeline construction equipment.
There are always problems of this kind during pipeline construction equipment construction, leading to continuous occurrence of welding quality problems. Once there is a quality problem, we can start from these aspects: First, we must investigate and analyze the cause of the problem. In addition to investigating the person directly responsible for the problem, we must also find out the related reasons.
For example, the management of the construction site is not in place or scientific, and the management personnel are negligent. They should not be deceived by the surface phenomenon of the problem, but should be investigated in depth. When penalties are carried out after the investigation, in addition to punishing the relevant responsible persons, it is also necessary to formulate rewards for those who find problems in advance.
The welding acceptance of pipeline construction equipment is the main link in the welding construction process to control the quality. During the inspection, different inspection methods and inspection ratios need to be adopted for different types of welds to meet the welding quality control requirements.
After the inspection, it is necessary to accurately feedback the specific situation with the relevant process at the first time, and find the cause of the welding quality problem in time, and give improvement measures and suggestions to ensure that the welding quality reaches the standard. The inspection work is usually easily restricted by the inspection environment and conditions.
Therefore, testing can only be carried out on finished products. Generally, there are two popular testing methods: destructive testing and non-destructive testing. In actual work, non-destructive testing is usually adopted, which is also the most common one. In non-destructive testing, air tightness testing and non-destructive testing are often used.
Finally, make a summary of the problem and propose rectification measures. The content of the measures must be implemented, and the time, progress, and person responsible for the rectification shall be clarified. Otherwise, the effect of the rectification will be poor. In short, in the pipeline construction equipment construction process, strictly implementing the welding process, controlling the quality of the counterpart, and reasonably requiring the construction period should be the main points of pipeline construction equipment control. At the same time, in the pipeline construction equipment process, set up the welding process witness point and do a good job in process monitoring.
We offers the Automatic Submerged Arc Horizontal Welder for tank fabrication applications. Unlike current girth welder on the market, the MSHW(AGW)series are with a Dual Drive System. This self-propelled submerged arc welding system can reduce field storage tank welding time as high as 25%. Weld defects are greatly reduced, saving tank erection costs. The Horizontal Welder is applicable for top-to-bottom or bottom-to-top construction single or double wall storage tanks for inside and outside welding. There are four standard units, however our design allows us to offer custom built units for non-standard applications
A. Master Frame
Master frame of the girth welder is constructed of structural steel and square tube members.
Erection Method: Bottom-to-Top
Min Diameter: Φ5.0m
Shell Width: TOP-to-bottom 1.5-3.2m
B. Dual Motor Drive
The dual AC motor design allows for constant travel across the entire tank circumference. When fit up is not quite perfect or there is an uneven surface for the machine to travel, the dual motors will power the machine across the imperfection. This design will reduce the amount of time required to repair weld defects and will decrease the overall tank erection costs. The dual motors are controlled by one easily
Programmable frequency inverter.
C. Power Source and Wire Feeder
The welding equipment supplied is the Lincoln NA-3S control and weld head fitted with nozzle and wire rolls. Wire reel（27.2kg）will be supplied with equipment too.
Power source : DC600
NA-3S Welding Progress Control
NA-3S Wire Feeder
The AGW console houses the electrical travel inverter drive and associated control replays it provides a mean of integrated control of all the accessories of the girth welder (e.g. flux vacuum, 220V single phase aux outlet, lamp, flux winch and so on). The console includes all necessary control knobs and switches such as the speed control potentiometer, direction switch, full speed travel switch as well as emergency stop button.
E. Flux Recovery System
Flux hopper capacity : 80kg & Rotating flux dam
Flux Lifting Winch
Max lifting height: 30m
Lifting Speed: 15m/min
F. Cable Assemblies
Welding Cable : 120mm2×60m
Control Cable : 10p×2.5mm2×60m
Power Cable : 3p×4mm2×60m
Ground Cable : 120mm2×5m
G. Electric Cabinet
In order to give full play to the advantages of pipeline prefabrication equipment and overcome the limitations of fixed pipe spool fabrication line, we have developed a movable pipe spool fabrication line, which has been used in PetroChina, Sinopec, and China National Chemical Corporation. So, what are the precautions for the quality inspection of the pipe spool fabrication line?
Here is the content list:
l About the quality inspection content of the pipe spool fabrication line.
l The product parameter mark on the pipe spool fabrication line.
l How to inspect the pipe spool fabrication line?
The pipe spool fabrication line consists of a work station for pipe beveling, a work station for pipe mechanical assembly, a work station for automatic pipe welding, a steel structure work station frame that can be quickly disassembled, a trolley railing system and a light rail to form a transportation system.
The testing items of the pipe spool fabrication line include: density, melt mass flow rate, hydrostatic pressure, ring stiffness, flatness, ring flexibility, thermal stability, volatile content, moisture content, carbon black content, carbon black dispersion, Pigment dispersion, gas component resistance, rapid crack propagation resistance component analysis, component content detection, etc.
The comprehensive performance of pipe spool fabrication line will reach a high level in China:
1. In the detailed design, China's most advanced "Pipe Manufacturing Design System" software is used to realize the rapid drawing of the pipe spool fabrication line. After the IDF interface module is configured, the design data of the PDS and PDMS design institutes can be directly shared, so a "seamless combination" is realized between design and construction.
2. In the manufacturing management, the domestic first-class "pipe manufacturing and installation management system" software is used to realize all-round information management of the entire pipe spool fabrication line manufacturing process.
3. Pipe spool fabrication line groove adopts a reliable pipeline groove mobile workbench, two of which are used for pipe groove.
4. Roller bed type pipe plasma cutting and beveling machines have been used to cut pipes and form bevels in one step through thermal cutting and processing.
5. An efficient pipe cutting band saw machine and a fixed radial pipe end beveling machine are used to cut the pipe and machine the bevel according to the working procedure.
6. The unique mobile workstation for pipe mechanical assembly in China has been used for weld assembly to mechanically assemble pipe shaft welds.
7. Cover pipe welding adopts advanced automatic pipe welding movable workstation, pipe spool fabrication line automatic welding machine is used to realize efficient automatic cover pipe welding of pipe shaft.
8. The logistics transportation adopts the light rail transportation system, the station frame and the trolley railing system. The light rail transportation system is used for long-distance mechanical logistics transportation, and the station frame is used for transportation. The overhead railing system is used for container internal and external logistics transportation.
9. The pipe spool fabrication line project has a production capacity of 3000 inches/year and a day's production capacity of 1000 inches/day, which meets the huge engineering demand for prefabricated pipelines.
Pipe spool fabrication line has now been widely used in all aspects of people's lives, and unqualified pipes directly affect people's quality of life and health. At the beginning of 2014, some media exposed the problem of individual companies using recycled waste to produce drinking water distribution pipes and fittings, which had a bad social impact. So how to enter the site to inspect the pipe spool fabrication line?
The material, specification, model and quality of the pipe spool fabrication line and pipe fittings should meet the current national product standards and design requirements.The appearance quality of the pipe spool fabrication line should not only meet the requirements of its product standards, but also the following requirements:
l There are no defects on the surface such as cracks, shrinkage holes, slag inclusions, folding, heavy leather, and rust or dents that do not exceed the negative deviation of the wall thickness;
l The thread surface is intact without damage, and the flange sealing surface is flat, smooth, without burrs and radial grooves;
l The gasket has no aging deterioration or delamination phenomenon, and no defects such as wrinkles on the surface.
l Inspection quantity: all inspections. Check the factory inspection report and certificate.
l Inspection method: observe and inspect.
l The size, wall thickness and allowable deviation of the pipe spool fabrication line should meet its product standards and design requirements.
l Inspection Quantity: 20% of the products of each specification and model are randomly checked by the number of pieces, and no less than 1 piece
l Inspection method: measure with steel ruler and vernier caliper.
For the pipe spool fabrication line belonging to one of the following conditions, sampling shall be conducted by the supervision engineer, and the inspection and re-inspection shall be carried out by a qualified inspection unit. The re-inspection results shall meet the current national product standards and design requirements.
Hydraulic jack is mainly used in the inverted construction of vertical cylindrical steel storage tank (hydraulic lifting method) in petrochemical industry, inverted construction of steel liner in power plant chimney and inverted construction of vertical cylindrical low temperature storage tank, etc. Today I will introduce our YT series hydraulic jack, and take the YT30 for example. I will introduce this product in the following aspect.
●The features of equipment
●The structure of equipment
●The overall structure of the equipment and its working principle
1.The set of equipment is mainly composed of hydraulic lifting pump station, hydraulic cylinder, wire rope and so on, easy to install.
2.The equipment adopts PLC program to control the lifting centrally. Each lifting pump station is equipped with displacement sensor device, which is easy to operate and has high lifting synchronization accuracy.The equidistant distance can be adjusted arbitrarily.
3.The hydraulic lifting pump station can be divided into two modes: dynamic and centralized control. The hydraulic cylinder can be adjusted (fine-tuning) rising and falling individually or locally (several), and can be controlled centrally by multiple groups. The lifting height can be more accurately controlled, which is convenient for the butt adjustment of the welding seam of the tank wall.
4.Each hydraulic cylinder is equipped with safety valve, good self-locking,equipment will not be due to power failure in the process of operation;
5.The blasting and breaking of a high-pressure rubber hose.The failure of a hydraulic cylinder causes the tank or heavy weight to slide or fall, and the hydraulic lifting process is safe and reliable.
6.The stroke of hydraulic cylinder is 3200mm, which can meet the one-time lifting completion of the existing panel width and reduce the lifting time.
7.The overall base length of the equipment is only 2200mm, which can fully meet the automatic welding process of large storage tank inner ring seam.
Electrical control system: power supply part, control part (operating platform) and pump station control box.
|Centralized control||Control panel||Power supply||Pump station control box|
The equipment consists of five parts;It is composed of power supply part, control part, hydraulic station part and pipeline part
● The power supply part provides power supply for the control part, and the hydraulic station provides power supply.
● The control part provides control for hydraulic station and hydraulic jack
● Hydraulic station: it is composed of oil pump electric unit, hydraulic valve set, high-pressure ball valve, high-pressure rubber hose and oil tank to provide hydraulic energy for hydraulic jack.
● Hydraulic jack part: hydraulic cylinder, wire rope, such as equaling rod device, hydraulic cylinder roof device, hydraulic cylinder support rod, etc
● The fixed plate, wire rope lifting lug and pin for the hydraulic cylinder are made by the user.
1).The set of equipment is evenly placed around the lifting object, the overall force and lateral force of the equipment are strictly calculated and successfully applied.
2).Precise and compact structure, adjustable output force, lifting speed to meet lifting requirements, high synchronization accuracy.
Force transfer process:
Output force of hydraulic cylinder → steel wire rope → rising ring (welded with lifting lug) → conduction plate → wall plate lifting
Hydraulic jacking system is mainly used in large tank construction. WINCOO ENGINEERING CO.,LTD is supplying tank hydraulic jacking system to tank contractors worldwide.
In actual operation, in order to ensure that the installation quality of pipeline construction equipment meets the construction requirements, targeted solutions must be taken according to the problem and its cause. The following will explain the installation of pipeline construction equipment before, during and after installation.
Here is the content list:
l Regarding the control of pipeline construction equipment before construction.
l Regarding the control of pipeline construction equipment during construction.
l Regarding the control of pipeline construction equipment after construction.
Regarding the control of pipeline construction equipment before construction.
Before construction, in order to ensure that the material of the pipeline construction equipment used meets the industrial requirements, strict inspections need to be repeated, including repeated verification and review of the construction drawings, and careful inspection of the pipeline processing drawings to ensure that the pipelines in the drawings The processing regulations and calculated data meet actual requirements.
In addition, it is necessary to check whether the pipeline construction equipment required for installation has a quality certificate and whether the specifications and models of the pipeline correspond to the certificate, and whether it meets the corresponding installation requirements of the pipeline construction equipment.
Before construction, check the pipeline construction equipment for damage and other quality defects that affect the construction. In order to get a more accurate understanding of the pipe material, professional quality inspection instruments can be used. For example, high-pressure pipelines can be detected by the monitoring method of magnetic flaw detection. Ensure that the material of pipeline construction equipment meets industrial production requirements.
In terms of capital investment in the installation of pipeline construction equipment, manpower, materials, and instruments and tools used are the main capital consumption objects. Manufacturers need to have a detailed grasp of the use of funds to reduce costs as much as possible without affecting the quality of the project. When selecting manpower, low-skilled workers should be employed for jobs with low technical requirements. When selecting materials, pipeline construction equipment is often selected for comparison. Before construction, it is also necessary to conduct professional skills training for construction personnel to enhance their work skills.
Regarding the control of pipeline construction equipment during construction.
During the installation process, when the pipe is cut according to the drawings, it is necessary to use the corresponding operating tools and methods to cut according to the construction requirements and the pipe material to avoid damage to the pipe. When connecting pipes, the main construction methods are hot bending and cold bending.
Hot bending is performed in the pipeline construction equipment installation process after heating treatment, specialized functional personnel make it deform according to the construction requirements; cold bending is carried out at room temperature, the pipeline construction equipment deforms according to the construction requirements. Since heating will cause mechanical deformation of the pipeline, cold bending processing methods are mostly used in the construction process. In hot bending, different heating fuels, heating pipeline construction equipment, and heating techniques must be used according to different pipeline materials and construction requirements, and the heating temperature must be strictly controlled.
The hot-bent pipes must be maintained after installation to ensure their quality and durability. When welding, due to the different materials of the pipeline and the different connection methods of the pipeline during the laying process, the welding tools and techniques selected will be different. The welding technology requires high requirements, and the construction personnel need to have good experience and technology to make the pipeline can be Therefore, experienced technicians should be selected for the welding process during the installation of pipeline construction equipment, and professional equipment should be used for testing after the welding is completed to see if seamless welding has been achieved to meet the engineering requirements.
Regarding the control of pipeline construction equipment after construction.
After the completion of the pipeline construction equipment, quality inspection and maintenance of the pipeline are required. When performing quality inspections, professional monitoring equipment is generally used, such as radiographic inspection, which can achieve non-destructive inspection. When the test is in progress, a unified test standard shall be adopted in compliance with the relevant technical standards, with special attention to whether the units used are unified.
After the pipeline construction equipment is installed, in order to better ensure the quality of the pipeline, it needs to be treated with anti-corrosion treatment. Generally, paint is applied to isolate the pipeline and the air in the water and oxygen from chemical reaction and rust. Extend the service life of the pipeline, and also improve the safety of operations for those who perform production operations.
Pipeline construction equipment is widely used in industrial production and has strict quality requirements. Due to the different pipeline construction equipment used in different industrial production environments, it is easy to have some problems during the installation process, which will affect the quality of the installation project. To ensure pipeline construction the installation quality of equipment meets the requirements of industrial production, and the installation process needs to be carried out in strict accordance with the construction requirements.