Three-way fitting manufacturing process
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Dear experts, could you please explain the manufacturing process for tees with a diameter greater than 600? Is it similar to the butt welding method used by on-site installation teams? The project now requires that all large tees (low-pressure pipes) be removed, with the explanation being that the quality of those fabricated on-site is no worse than that of ready-made tees
There’s no other way but welding on site
Three-way valves come in tube-pulling types and hydraulic types. I’ve never seen the welding mentioned in your project.
It is estimated that on-site welding of tees will be required, using the common saddle joint welding method; for larger sizes, welding reinforcement rings to strengthen the structure is necessary.
Some are stamped, while others are welded at the saddle joint
Could an expert from a tee manufacturer please explain this to us? We want to eliminate the use of finished tees in order to save money, but I firmly object to this; we need more reasons
Elbow welds with openings are permissible in design. . . Calculate it based on opening reinforcement. It’s possible; in principle, it’s feasible. . Of course, on-site quality control is crucial, with full penetration of the cross-section. . . . This is key
Does anyone have experience with this? When using field-welded tees, stress calculations don’t work out, but there are no problems when using standard butt-welded tees (manufactured in a factory)
The quality is definitely different; on-site welding is ultimately just a way to save money
Are there no pipe fitting manufacturers here? Please provide a detailed analysis of what exactly are the differences between tees manufactured by factories
Specifically, it depends on the operating conditions of the tee, as well as factors such as pressure and temperature. In general, it is possible to make an opening on-site; compared to a tee, a tee is definitely the better option, as there is a radius of curvature at the point where the branch pipe connects to the main pipe. However, when an opening is made and the branch pipe is reinforced with welding, there is no such radius of curvature. This is the fundamental difference – the presence or absence of a radius of curvature affects the degree of erosion and the service life of the component