What codes are applied to urban heating projects with steam pipelines exceeding 1.6 Mpa? Waiting online

Hello, CJJ104 is a directly buried steam pipeline, suitable for use in directly buried steam pipelines with a pressure not exceeding 2.5 MPa and a temperature not exceeding 350°C. In the question, of the 22.56 km long pipeline, only 4 km is buried underground; the rest is installed above ground. What standards are followed for the above-ground section?

Personally, I think it’s feasible to use industrial pipeline design for fictional scenarios

This post was last edited by Baoji ChaoSheng Titanium Industry on 2018-8-8 at 13:51. This issue has been discussed before; it is recommended that you refer to this post. For areas outside the range of urban heating pipelines, design shall be carried out in accordance with the specifications for power plant heating pipelines. https://bbs.hcbbs.com/thread-1645072-2-1.html @FishInTheDesert

I agree with you; in fact, the regulations should be revised

DLT 5054-2016 Code for Design of Steam and Water Pipelines in Thermal Power Plants – So this code shall be used. As for safety distances and such, CJJ34-2010 can still be used as a reference

As for the details of this safety distance, you still need to seek advice. @Fish in the desert

Hello, first of all, I am very grateful for your suggestions and help. I took another close look at these specifications just now, and I think it’s possible to combine the regulations for power plants with those for urban heating systems: 1. \"Code for Design of Steam and Water Pipelines in Thermal Power Plants\" (DLT5054-2016) and \"Code for Design of Power Pipelines in Power Plants\" (GB50764-2012). These two codes related to the design of steam pipelines in power plants specify which types of pipelines are applicable within thermal power plants. However, the pipelines in question are all those that supply steam from outside the power plant to industrial parks, over a considerable distance of 25.77 km. I believe that the parameters related to these pipelines as well as the materials used can be determined in accordance with these two codes. As for aspects such as the routing of long-distance pipelines, methods of installation, safety distances, crossings, and whether the pipelines should be buried or installed overhead, those should be governed by CJJ34 and CJJ104 – as these codes hardly address anything related to the design of pipelines within power plants. After all, the pipelines inside a power plant are short in length, and there are no complex external factors to consider. 2. The scope of application of CJJ104-2014 \"Technical Specifications for Directly Buried Steam Pipes in Urban Heating Systems\" is applicable to directly buried underground steam pipes with a pressure not exceeding 2.5 MPa and a temperature not exceeding 350°C; this is the standard from 2014. The previous version of this standard was the one from 2005; it applied to directly buried steam pipelines with a pressure not exceeding 1.6 MPa and a temperature not exceeding 350°C. In contrast, the CJJ34-2002 version (replaced) is applicable to hot water media, while the CJJ34-2010 version (current) covers steam pipelines with a pressure not exceeding 1.6 MPa and a temperature not exceeding 350°C. Does this mean that it is still possible to use such references as a basis? Perhaps a new version will be released in a few days; after all, back in 2014, the pressure applied to directly buried pipes was already increased to 2.5 MPa. These are my personal opinions; please point out any errors if there are any. :handshake

Yes, the standards do need to be revised.

CJJ34 states that pipeline calculations should be carried out in accordance with the power plant design.