May I ask, for steel valves, what diameter range uses threads, what diameter range uses socket welding, and what diameter range uses flanges? ?
Thread Content
May I ask, for steel valves, what diameter range uses threaded connections, what diameter range uses socket weld connections, and what diameter range uses flange connections? ? When creating a table of pipeline grade materials, how are the valve models and pipe diameter ranges determined? ? ?
Generally, flanges are used for 2\" and above. The pipeline grade table is classified according to design temperature and pressure.
For small-diameter valves with a diameter of DN50 or less, socket welding is used; for valves designed for high temperatures and pressures, butt welding is employed. Flanges also come in various types of sealing surfaces, suited to different materials and pressure-rated valves
Small-diameter valves are often welded by butt welding or socket welding, while large-diameter valves are more commonly joined using flanges
The people above have all said good things; if the original poster has any questions, they can take a look at SEI’s pipe grade tables, which include both European and American standards. It details the selection of pipes for different pressure levels, temperatures, and media, including the range of pipe diameters
This post was last edited by Xiao-Wu on 2016-10-14 at 13:45. I quite approve of the grade specification design standards for pipeline materials set by SEI Sinopec Engineering Construction Company, as the connection methods for fittings and valves are determined based on various factors. For details, please refer to the attachment. 2. The distribution of API/ASTM materials and related documents is prohibited, as is the distribution of SEI-related materials. Please avoid any violations of these rules – Powered by Discuz! http://bbs.hcbbs.com/thread-1410146-1-1.html
Is it prohibited to distribute API/ASTM materials and related materials, as well as SEI-related materials? ? ? ? ? ? ! ! ! ! !
In accordance with international practices, for pipes of DN50 and above, butt welding is commonly used as the connection method, while for pipes of DN40 and below, bending, socket welding, or tapered pipe threads are typically employed for the connection fittings. When selecting butt-welded fittings, the pipe size designation of the fitting should be consistent with that of the pipe it is connected to, in accordance with the principle of equal strength.
Refer to HG/T 20646.5 Technical Specifications for the Design of Pipeline Materials in Chemical Plants. Threaded pipe fittings are typically used for nominal diameters smaller than DN50. Plug-and-socket connections are typically used for pipes of DN40 and below