Reasonable selection, proper storage and correct use of manufacturing materials are the prerequisite and basis for ensuring the quality of pressure vessels. This article makes some meaningful discussions on the material quality management issues in pressure vessel manufacturing, hoping to serve as a reference and reference for colleagues in the industry.
As a special pressure-bearing equipment, pressure vessel has been widely used in petrochemical, energy, scientific research and military industries. Its quality is directly related to the production safety of these industrial fields, so it must be given full attention.
In order to ensure the manufacturing quality of pressure vessels, the first requirement is to manage and control the quality of vessel materials. If the pressure vessel manufacturing materials used have quality defects, no matter how the subsequent optimization and improvement of the process process, the final product quality is difficult to guarantee.
Therefore, reasonable selection, proper storage and correct use of manufacturing materials are the prerequisite and basis for ensuring the quality of pressure vessel products. Based on this standpoint, this article makes some meaningful discussions on the material quality management issues in pressure vessel manufacturing, hoping to serve as a reference for colleagues in the industry.
Overview of pressure vessel manufacturing
As a special pressure-bearing equipment, the pressure vessel’s manufacturing quality is very important for the safety application in the industrial field. At present, in order to ensure the production quality of pressure vessels, my country has issued corresponding standards and specifications, which must be designed and manufactured in strict accordance with the requirements of the national standard.
In practical applications, the types of pressure vessels are different, and their functioning principles and application fields are also different. This requires that in the process of manufacturing them, the manufacturing quality must be ensured to meet the actual application requirements.
In addition, as a special type of equipment, pressure vessels are more difficult to manufacture than general vessel products. The entire manufacturing process has very high quality and safety requirements, requiring close coordination and cooperation from multiple disciplines.
In reality, there are many factors that affect the quality of pressure vessel manufacturing, and any error in any of them will affect the quality of the final product. Material selection is the first step of manufacturing, and strict quality control is also necessary.
Considering that there are many types of materials available in practice, and the final material quality still depends on the control of storage and other links, it is of great significance to strengthen the control of factors related to material quality in the manufacturing process and must be given sufficient attention.
Matters needing attention in material substitution
In the manufacturing process, if a thick plate is used instead of a thin plate, the structure of the joint may be changed. For example, when the thickness increases more, the welding structure may change.
When the overall thickness is replaced by thinness, even if the local stress at the joint between the head and the cylinder is not increased, it will affect the quality of the container product to a certain extent, and it will also cause the welding, flaw detection and heat treatment processes used in the original design to be changed. Land no longer applies.
In addition, the substitution of materials for pressure vessels may also lead to changes in the weight of the container products, which in turn will affect the supporting support and foundation of the products.
In short, in the manufacture of pressure vessels, in principle, it is not allowed to substitute materials randomly, because different materials will have different performances. Even if one performance has reached a higher level, it may be replaced by another. In terms of low-to-high, and these will make the process measures and schemes used in the entire production process must be modified accordingly, but this change often results in poor solderability and doubled manufacturing process difficulty. So we must be cautious about material substitution.
Material quality management measures in pressure vessel manufacturing
Material procurement measures
For machinery manufacturing, the procurement of raw materials is a key basic link to control the quality of the final product, and the manufacturing of pressure vessels is naturally no exception.
Taking into account the chaotic order of the current material supply market, even for materials of the same specification, quality differences caused by different manufacturers abound. Therefore, pressure vessel manufacturers must strengthen management of the procurement of raw materials.
First of all, we must conduct credit checks on the production and suppliers of materials, and select those with good credit and long-term cooperative relations.
Secondly, after each material purchase is completed, the company should evaluate the supplier’s supply speed, service quality and product quality, and record the evaluation results in the material supplier’s files for future material supplier selection Provide evidence.
Finally, pressure vessel manufacturers should establish a sound and complete material procurement quality control system, strengthen supervision of whether the purchased materials comply with relevant national and industry standards, and strengthen inspections of the material quality certificates and other certification materials provided by suppliers. The responsibility for inspection is assigned to the individual, and strive to ensure that the selected materials meet the design performance index requirements.
The quality management department shall strengthen the quality acceptance of the delivered materials, and the inspectors and engineers may conduct quality inspections on whether the materials meet the relevant standard requirements. Before the materials are put into storage, they must go through scientific acceptance and supervise whether the acceptance process meets the relevant process specifications.
Make sure that the procedures are complete when materials are put into storage. Acceptance records of materials must be filled in accurately. All the above processes must form a clear process specification. Once there is an acceptance problem, the responsibility traceability mechanism can be activated immediately to find out the problems in the acceptance process and improve it.
Material storage measures
The purchased materials shall be classified and stored when they are put into the warehouse. They shall be kept scientifically according to the specifications, composition and physical and chemical properties of the materials, and shall be marked accordingly.
The material storage warehouse should meet relevant requirements such as ventilation and drying, and different sensors should be set up in the storage area according to different materials to monitor whether the storage environment meets the storage requirements of the materials in real time to ensure that the materials will not appear in storage Degeneration and other issues.
Finally, in the process of distributing materials, we must strictly abide by the “application-review” system, standardize the application and distribution process of materials, and ensure the scientific and reasonable use of materials.
Material recycling measures
Before using the material, the size and specification of the material should be checked according to relevant regulations and drawings. Only after the inspection is qualified can it be used for pressure vessel manufacturing. Mark the materials that have been received and still have surplus after manufacturing. After the materials pass the inspection and confirmation, the return procedures can be processed.
Source: China Pipe Fittings Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)