Qualitative analysis of the outlet pipes for medium and low pressure boilers
Thread Content
The \"New Catalogue of Licenses for Special Equipment Manufacturing Units\" came into effect on June 1, 2022. As noted in Note 2 of Annex 1 to this catalogue, regarding the permission parameters for boiler manufacturing and installation: the pipelines within the scope of boilers can be designed by the boiler manufacturing unit, or by a unit that holds a GCD-level license for designing pressure pipelines. Does that mean that in the future, the outlet pipes of medium and low-pressure boilers (such as those at 1.0 MPa, 1.25 MPa, etc.) will also be designed according to GCD?
Based on the information you provided, it can be seen that, according to the list of permits for new special equipment manufacturers, pipelines within the scope of boilers can be designed either by the boiler manufacturer itself or by a unit that holds a design permit for pressure pipelines of the GCD category. Therefore, whether the outlet pipes of future medium and low-pressure boilers (such as 1.0 MPa, 1.25 MPa, etc.) shall follow GCD depends on the specific circumstances. If the boiler manufacturer holds a design license for pressure pipelines of the GCD class, then the outlet pipelines it designs can be designed in accordance with the requirements of the GCD class ； If such permission is not obtained, the design may be carried out by other entities that have been granted permission to design pressure pipelines at the GCD level. In short, during the actual implementation process, it is necessary to operate in accordance with the requirements of relevant laws, regulations, and standards to ensure that the boiler outlet pipeline is qualified and safe. .
For the pipes within the boiler range of boilers other than power station boilers, in cases where a steam (water, oil) distribution cylinder is installed, it refers to the pressure-bearing pipes located within the first ring joint from the outlet of the feedwater (oil) pump to the outlet of the steam distribution cylinder and up to the point where they connect with external pipes； For those without steam (water, oil) distribution cylinders, it refers to the pressure-bearing pipes from the feedwater (oil) pump outlet to the main steam (water, oil) outlet valve. For steam systems without steam distributors, the steam pipes within 1000 meters from the boiler to the first heat-consuming equipment can be installed together with the boiler, subject to the pipeline requirements applicable to the boiler, and undergo supervision inspection and periodic inspection.
Pipes within the boiler range of non-power station boilers fall into two categories: those equipped with steam (water, oil) distribution cylinders and those without such cylinders. In the case of steam (water, oil) distribution cylinders, the pipes within the boiler area refer to the pressure-bearing pipes from the outlet of the feedwater (oil) pump to the first ring joint where it connects to the external pipes ； In the case where steam (water, oil) cylinders are not installed, the pipes within the boiler area refer to the pressure-bearing pipes from the outlet of the feedwater (oil) pump to the outlet valve of the main steam (water, oil). For steam systems without steam distribution cylinders, the steam pipes within 1000 meters from the boiler to the first heat-consuming equipment can be installed together with the boiler in accordance with the requirements for pipes within the boiler area, and subject to supervision inspection and regular inspection. The inspection of these pipelines must comply with relevant laws, regulations, and standards to ensure their safety and reliability and to prevent accidents. .
The “New List of Permitted Entities for the Production of Special Equipment” cannot be found on the official website of the State Administration for Market Regulation.