Taking the simple welding ecological environment as an example, it is not only necessary to know the temperature and humidity of the ecological environment, but also to consider how to effectively take corresponding preventive measures under climate conditions such as wind speed, rain, and snow.
In addition to the appearance inspection of the shape and specifications of the welded joints, other testing methods such as inspection techniques, metallographic examination, and testing specifications must also be used for the quality inspection of pressure vessel welding products in order to distinguish between good and bad quality.
Quality control throughout the entire manufacturing process
(1) Implement a mandatory statistical indicator system for manufacturing permit qualifications for pressure vessel manufacturing companies.
(2) Implement a training and assessment system for various professional technologies related to the manufacturing quality of pressure vessels, such as welders and non-destructive testing personnel, who must hold certificates before entering the workforce.
(3) Implement a job requirement management system for quality management system responsible persons (such as quality assurance project engineers, scheme design responsible persons, raw material responsible persons, production process responsible persons, welding responsible persons, heat treatment method responsible persons, testing technology responsible persons, physical and chemical inspection responsible persons, testing and testing responsible persons, etc.) and professional technical personnel of pressure vessel manufacturing companies.

(4) For the process management of product design, raw materials, manufacturing, testing until completion and shipment, a system of self inspection by manufacturing enterprises and mandatory supervision and inspection of product safety performance is implemented. Some important projects and mechanical equipment also require customer representatives or authorized third-party inspection organizations to control and inspect.
1. What is a pressure vessel?
Pressure vessel refers to a closed mechanical equipment that contains gas or liquid and bears a certain pressure. The application scope is defined as: ① Fixed, stationary, and mobile containers with a capacity greater than or equal to 30L and an outer diameter (non annular cross-section refers to a cross-sectional dimension larger than the inner boundary of the cross-section) greater than or equal to 150mm for LNG natural gas and liquids with a relatively large working pressure greater than or equal to 0.1MPa (accurate measurement pressure) and a relatively large working temperature greater than or equal to the standard melting point; ② Gas cylinders with a standard melting point equal to or lower than 60 ℃ for gases, compressed natural gas, and liquids, a rated current working pressure greater than or equal to 0.2MPa (accurate measurement pressure), and a working pressure capacity product greater than or equal to 1.0MPa • L; Used for rapid cooling.
What is the difference between using and managing simple pressure vessels and general pressure vessels?
(1) Generally, pressure vessels should be registered and applied for, while simple pressure vessels do not require registration and application. (2) General pressure vessels must be inspected by special equipment inspection and testing institutions. Simple pressure vessels require timely maintenance and inspection by customers within the recommended application time. Special equipment regular maintenance and testing institutions will be invited to conduct safety inspections only when abnormal situations are detected; Pressure vessels that have reached the recommended service life should be damaged as much as possible. If repeated use is required, maintenance should be carried out in accordance with the "Periodic Inspection Rules for Pressure Vessels".