Issues regarding the design codes for power pipelines
Thread Content
Among pressure pipelines, there is a category known as industrial pipelines. Within industrial pipelines, there is another category called power pipelines. So the question is: which design standards apply to these power pipelines? As far as I know, the current domestic standards for power pipelines specify that their scope of application is thermal power plants; we know that not all power pipelines are found in thermal power plants. So, what standards are used for the power pipelines that fall outside the scope of thermal power plants? Fully in accordance with industrial piping codes? During the training on pressure pipelines, the instructor said that the power pipelines in thermal power plants should also be classified as industrial pipelines. However, the situation in this area seems rather chaotic at present. Previously, the power pipelines in thermal power plants were classified under category GD; will category GD be abolished in the future, with such pipelines being directly assigned to category GC? This involves not only the issue of classification, but also affects the revision of relevant standards and specifications; after all, the previous GD and GC standards were different, and some of the provisions were also inconsistent.
We write it as “GD1/2 pipelines in GC classes” now.
Do you use 20801 for your design specifications?
There has always been a question: industrial pipelines are included in the catalog of special equipment, and yet the \"Code for Pressure Pipelines – Power Pipelines\" was also published. The newly revised 20801 also explicitly excludes GD-type pipes. Solve
The domestic pipeline industry is in a chaotic state; there are no universal standards like those for steel structures or pressure vessels, and in this field, each company operates on its own
Power pipelines are now classified as GCDs; they belong to the category of industrial pipelines. However, GB/T 32270 \"Code for Pressure Piping – Power Pipelines\" is separate from GB/T 20801. It seems that I haven’t learned well from American standards – in ASME B31.1 and ASME B31.3, these categories are clearly distinguished: ASME B31.1 covers power pipelines, including the pipes outside boilers in chemical plants (BEP), while ASME B31.3 deals with industrial pipelines, including NBEP
I really can’t figure it out; after completing the study, I end up being something that’s not like anything else: L
This post was last edited by sdfczhangkai on 2020-2-23 at 22:30. Minutes of the 2018 Annual Meeting of the Power Piping Technology Committee and the Seminar on the Revision of the \"Regulations for Safety Inspection of Pressure Piping – Industrial Piping\". The China Electric Power Planning and Design Association (hereinafter referred to as the Association) organized the \"2018 Annual Meeting of the Power Piping Technology Committee and the Seminar on the Revision of the ‘Regulations for Safety Inspection of Pressure Piping – Industrial Piping’\" in Changchun from September 5 to 6, 2018; 20 representatives from 14 organizations, including the Northeast Electric Power Design Institute Co., Ltd., attended this meeting. The main points of the meeting are summarized as follows: Third, at the request of the relevant departments of the State Administration for Market Regulation, the meeting discussed suggestions for revising the \"Regulations on Safety Technical Inspection of Pressure Pipelines – Industrial Pipelines\". The key points include: 1. The classification and grading of pressure pipelines should be consistent with the \"Catalogue of Special Equipment\" (Document No. 114 issued by the General Administration of Quality Supervision, Inspection and Quarantine in 2014), while also ensuring continuity in the policies related to the supervision of pressure pipelines. It is recommended that, in line with the \"8300 series\" specified in Document No. 114, process pipelines (8301) be classified as GC1(1), GC1(2); power pipelines (8302) as GC2(1), GC2(2); and refrigeration pipelines (8303) as GC3 ； Among them, the power pipeline (GC2) is divided into two stages based on subcritical parameters, and the feedwater is included within the scope of management of the power pipeline. The specific recommendations are as follows: A1.3 GC2 (1) class (1) power plant, transmission design pressure P≥16.7MPa ； Or steam and steam-water two-phase flow pipelines with a design pressure of 16.7 MPa > P ≥ 4.0 MPa and a design temperature of T ≥ 570°C ； — 3 —(2) Water pipelines in power plants with a design pressure of P≥22MPa for transportation. A1.4 GC2(2) class refers to other power pipelines other than those of GC2(1) class specified in Annex A1.3 of this document. The China Electric Power Planning and Design Association is studying this issue; in the future, industrial pipelines will be classified as GC1, power pipelines as GC2, and refrigeration pipelines as GC3.
A1.3 GC2 (1) class (1) power plant, transmission design pressure P≥16.7MPa； Or steam and steam-water two-phase flow pipelines with a design pressure of 16.7 MPa > P ≥ 4.0 MPa and a design temperature of T ≥ 570°C ； — 3 —(2) Water pipelines in power plants with a design pressure of P≥22MPa for transportation. A1.4 GC2(2) class refers to other power pipelines other than those of GC2(1) class specified in Annex A1.3 of this document.