What material should be used for boiler feed water (including deionized water and deoxygenated water) and steam condensate pipes?
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For boiler feed water (including deionized water and deoxygenated water) as well as steam condensate, whose design pressure is less than 10.0 MPa, and for low-pressure steam and low-pressure superheated steam with a design pressure of less than or equal to 1.0 MPa, GB3087 seamless carbon steel pipes should be used. Where does this standard come from?
There is no such regulation; the mandatory standards for power pipelines are specified in GB 50764-2012, the Code for Design of Power Pipelines in Power Plants. Clause 5.2.4 thereof states that for pressures equal to or less than 1.6 MPa, GB/T 8163 can be used. The provisions of DL/T 5054-2016 4.2.2 are the same as well. Here, for grade 20 steel, GB 3087-2008 is uniformly applied; for desalinated water, GB/T 14976-2012 is used; for 304 steel, SY/T 5037-2012 is applied to large-diameter low-pressure steam with a pressure of 1.0 MPa or less; and Q235 is used as well
Thank you. The content of this topic comes from page P625 of \"Industrial Pipeline Design and Engineering Applications\" (compiled by Song Kekē in 2017). I’m not sure which standard it is derived from
Since electrical standards, which are specialized in steam systems, do not require the use of GB 3087 for low-pressure steam, other standards are likely to have no specific provisions on this matter as well. Neither GB 50316-2000 nor GB/T 20801.2-2006 contains any specific regulations in this regard. Moreover, looking at that page in the book, GB/T 8163 lists utility materials among its applicable media; in my understanding, low-pressure steam also falls under utility services. If a reference is necessary, one can consult the pipe fitting manual for the power industry, GD2000. For PN63 and lower grades in this manual, GB 3087-20 is the standard material used; it is also a commonly employed material. For PN40 and lower grades, GB/T 8163 Q345 is specified, but this material is not as commonly used. It can also be observed that GD2000 specifies GB/T 8163 material for grades above PN16, which conflicts with DL/T 5054. A friendly reminder: GD2000 has many errors, so be cautious when using it as a reference. Therefore, taking everything into account, it is a safer choice to use GB 3087 20 for low-pressure steam pipelines, and the description in the book is correct.
The regulations for boiler safety inspection specify this clearly.
Is it included in this supervision procedure?
According to you, it’s not necessary to use a pipe of type 3087; one of type 8163 will also work?
Huh, wasn’t the reply from yesterday sent? For GC pipes, GB 50316-2000 does not provide any specific instructions regarding the scope of application of GB 3087 and GB/T 8163. As for GD pipes, TSG G0001-2012, GB/T 32270-2015, GB 50764-2012, and DL/T 5054-2016 all state that PN16 and lower grades can use GB/T 8163. Since the book you referred to is a book, not a standard or even a manual, that statement might be a summary of engineering experience; in reality, when designing, we use GB 3087 as the minimum standard for GD pipes. We make our choices based on the pipeline fittings manual GD2000 for thermal power plants; GB 3087 20 is mainly used, as well as GB/T 8163 Q345, but this material isn’t commonly used, so it’s not employed in most cases. However, the GD2000 does not have the fittings specified in GB/T 8163-20. So I think it can be described this way: for seamless steel pipes used in low-pressure steam pipelines of PN16 and below, GB/T 8163 20 can be used, but GB 3087 20 is recommended.
It is determined based on the working pressure; we generally use GB3087
Check the boiler inspection regulations and pressure pipeline requirements