Regarding the use of three-way and four-way connections
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I would like to ask fellow sailors: what are the advantages, disadvantages, and applications of three-way and four-way connectors? In design, we often encounter situations where a four-way connector could be used, but we usually opt for two three-way connectors or other alternatives to avoid it. Is it because four-way connectors are difficult to find or not easy to use?
Mainly, there are too many installation and usage requirements for four-way connections, which makes problems likely to occur; therefore, they are often not chosen
The costs of SiTong are too high, the amount used is too small, and the market is limited; therefore it is generally not used
Where is it mentioned that the installation requirements for SITONG mentioned on the 2nd floor? I saw a process diagram for an LNG refueling station provided by a equipment manufacturer, and there were many tee joints in it; I’m not sure if this was done for specific reasons or to save materials.
The cost of four-way connections is too high, so they are generally not used. Another issue is that the welding stress is too concentrated, so it’s not used in many applications; two tee joints combined can allow for a variety of angles
JB/ZQ 4396-1997 – Guidelines for pipe trenches and pipe fixation; you should download this standard, as it contains installation requirements for tees. It seems that installing tees presents difficulties in terms of materials, space, and labor requirements.
I encountered this problem as a beginner too. An experienced worker told me that four-way connectors are generally not needed, but he couldn’t explain why. I think since such connectors exist, we should be able to use them if we want to.
Four-way connections are generally used in special applications, such as for steam tracing and pipelines in low-temperature environments