Regular and annual inspections for pressure vessels and pressure pipelines.

Firstly, pressure vessel inspection reports are divided into statutory inspections (regular inspections) and commissioned inspections (annual inspections, inspections prior to commissioning). The first regular inspection is referred to as the initial inspection; it was previously called a comprehensive inspection, but they mean the same thing. Legal inspections must not be delayed; failure to do so will result in penalties, and they should be carried out one month in advance. The annual inspection is required by technical specifications to be carried out at least once a year; it is actually a statutory inspection that must be fulfilled. Similar to this is the monthly inspection. Pre-commissioning inspections are a relic of previous regulations; they served as a substitute for the inspection during the installation of pressure vessels, and their use is being phased out gradually. Pressure pipelines are similar to pressure vessels, but instead of pre-commissioning inspections, they undergo proper installation supervision inspections, which are considered statutory inspections. Secondly, the annual inspection can be carried out by oneself or entrusted to a specialized inspection agency, provided that it is approved by the local regulatory authorities; even if the annual inspection is done by a specialized agency, it will not be valid if it is not recognized by the local regulatory authorities. This was mentioned before. Finally, if there is anything still unclear, feel free to ask.

TSG21 refers to annual inspections and monthly inspections as regular self-inspections. If the monthly inspection coincides with the annual inspection, the monthly inspection can be omitted. Under normal circumstances, a periodic inspection is carried out in the same year instead of an annual inspection. It is also possible to conduct an annual inspection first and then a periodic inspection; however, some inspection agencies require a periodic inspection to be carried out first followed by an annual inspection, with only periodic inspections being done in the same year generally.

Previously, the distinctions between inspection, testing, and examination were not so clear, and the names used were also confusing. After the implementation of the Special Equipment Law, regular inspections and regular self-inspections were established; these concepts originated from the Regulations on the Safety Supervision of Special Equipment. The Special Equipment Law contains clear penalty provisions for inspections, but it only requires such inspections to be carried out without specifying any penalties; relevant technical standards can only further detail these requirements. Whether to conduct the inspection or not depends on local regulations or the opinions of local regulatory authorities.

:The explanation of handshake is very clear, thank you!

First question: There is no such thing as an annual inspection for pressure vessels and pressure pipelines; only regular inspections and periodic checks exist； Second question: Periodic inspections and comprehensive inspections are the same; current regulations have standardized the term, using it to refer to \"periodic inspections\". Third question: Periodic inspections must be carried out by inspection agencies with the appropriate qualifications (currently, this is usually the special equipment inspection agency in the location where the equipment is situated), while annual inspections can be conducted by trained personnel within the organization who possess the necessary expertise, or they can also be entrusted to special equipment inspection agencies. A friendly reminder: Whether it is pressure vessels or pressure pipelines, regular inspections and annual inspections are two different types of inspections; their contents and focus areas are entirely distinct, and one cannot replace the other. For example: a container or a pipeline, even if it underwent regular inspections at the time, must still be inspected annually.

Liren Mechanical and Electrical specializes in the regular inspections and annual inspections of pressure vessels. It provides services related to the testing, registration, notification, installation, and submission of reports for pressure vessels, as well as handling the procedures for obtaining certificates of use for such vessels. Liren Mechanical and Electrical is actually Shenzhen Liren Mechanical and Electrical Equipment Engineering Co., Ltd.; it was founded in 2008. Its predecessor was the Guangdong Mechanical and Electrical Equipment Technology Research Center. The company developed further in 2015 and is now an engineering equipment enterprise that focuses on installation services for mechanical and electrical equipment, as well as installation and testing services for energy-saving and environmental protection projects, along with special equipment. After years of development, the company boasts a highly skilled service team that, thanks to its excellent service standards and professional technical expertise in safety, is able to provide better and higher-quality services to various customer groups. The company provides one-stop services for special equipment, including full-scale contracting for the regular inspection of safety valves, pressure gauges, and pressure vessels, as well as annual inspections and registration procedures for such vessels. It also offers services related to the procurement, testing, installation, supervision, and annual inspection of special equipment such as gas storage tanks, air compressors, boilers, forklifts, and cranes. www.lirenjd.com

Regular inspections are legally mandated and must be carried out before their expiration date. The annual inspection is generally carried out by the enterprise itself, but it is required to have the necessary qualifications for managing pressure pipelines and pressure vessels, as well as to have tools and instruments such as thickness gauges available

Is a regular inspection (comprehensive inspection) one in which all parts are checked, or is it a sample inspection? What is the sampling rate?

The detection ratio is either 20% or 100%, with very rare cases of 50%. Even with a 20% testing rate, responsibility still applies to the areas that are not tested; therefore, 100% is generally chosen. As for those low-risk air storage tanks, that’s a different matter.

The periodic inspection of containers refers to the activity aimed at verifying whether a container in use meets safety requirements. Once a container passes such periodic inspection, it is considered to meet the relevant provisions of the Fixed Container Regulations. Therefore, random inspections are not part of the periodic inspection process, as the latter covers all aspects of the container itself. During regular inspections, sampling is generally targeted at specific testing items, such as thickness measurement and non-destructive testing. When conducting regular inspections on such containers, inspectors, in accordance with regulatory requirements, select some representative areas within the container’s base material or weld joints that may pose safety risks for testing.