SW6 strength calculation issue
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Newbie question: When using SW6 to check the strength of openings, how should the outer diameter and wall thickness of the pipe be entered for NA joints? Additionally, when performing external and internal pressure checks on the same device, is it generally true that if the external pressure test passes, then the internal pressure test will also pass?
Threaded connectors all have threads at the top, with a thick-walled tube following; you just need to calculate based on the outer diameter, thickness, and length of this thick-walled tube. Internal and external pressures are not comparable. The internal pressure is affected by pressure, diameter, material, and temperature, whereas the external pressure calculation depends on L/D and D/δ, and is independent of the material. Sometimes the internal pressure may be within specification while the external pressure is not; similarly, the external pressure may be within specification yet the internal pressure is not, especially in terms of opening reinforcement.
The flanged structure like yours is quite rare; there is no thickness at the bottom, and the additional reinforcement area of the pipe fitting is taken as 0 based on a conservative estimate
Agree with the person above; the area you’re taking over is indeed difficult to determine. Also, I’m curious about how you verify the stress on flange joints of this type
I’m also a beginner. My master told me that when using SW6 to check NA connectors, the thickness should be taken as the average of the base thicknesses, while the protrusion length should be based on the height of the base
You can try your master’s method; it’s a bit troublesome due to the irregular shape
For containers with jackets, the internal pressure is generally calculated while the external pressure is checked. Whether external pressure or internal pressure plays a decisive role in terms of thickness depends on the magnitude of these pressures.
Strengthening calculations can be performed using equivalent Takeover.