Could everyone help figure out why this tee has cracks? Another 80-three-way connector had the same problem yesterday!
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This post was last edited by zwx04 on 2018-6-25 at 12:05: https://v.youku.com/v_show/id_XMzY4MzExODU2MA==.html?spm=a2h3j.8428770.3416059.1. When testing it, cracks were found in the tee fitting; https://v.youku.com/v_show/id_XMzY4MzExODU2MA==.html?spm=a2h3j.8428770.3416059.1. Yesterday, another tee fitting with a diameter of 80 also showed the same problem! They are all made of 20# steel. https://v.youku.com/v_show/id_XMzY4NTEzMTk0MA==.html?spm=a2h3j.8428770.3416059.1
1. Material corrosion； 2. Manufacturing defects
Some products from unregulated manufacturers have a high defect rate, and it’s hard to avoid that.
This post was last edited by sdwfsgyykai on 2018-6-25 at 11:40. It’s not a quality issue; it’s probably an installation problem or a design issue. This is likely due to stress causing it to be pulled and deformed, resulting in damage. I suggest you check again the direction of the forces acting on this tee, and see if there are issues such as pipe supports being improperly installed or the tee being used as a support point. Let’s take a look from a mechanical analysis perspective. When machining tees, cracks should appear in the area with the greatest deformation; they should be transverse cracks. As a supplementary point, the vibrations generated by the pipeline during normal operation can also cause this area to tear if additional components are installed in an inappropriate manner. (Personal opinion, for reference only)
The reason for no magnetic particle testing upon leaving the factory is cracking caused by extrusion deformation, which is normal during the production of tees
And it’s split very neatly, right? {:1_90:}
1. Material defects 2. Manufacturing defects
It also has a lot to do with installation; if that doesn’t work, it’s possible to use a material of better quality
The cracks are very regular; is it related to manufacturing defects? Do you think this cracking is related to the manufacturing process? The red line indicates the direction of the tee. The crack runs through the entire tee, effectively splitting the tee in two. What caused it? Working in a wet hydrogen sulfide environment – is it related to corrosion?