Material Analysis
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Pressure Resistance Failure of PEEK Oil and Gas Pipe Fittings
Problem Phenomenon
PEEK pipe fittings for the oil and gas industry leak or burst in pressure resistance tests, with failure locations mostly at weld lines and wall thickness transition areas, while the same batch shows no abnormality in appearance inspection.
Cause Analysis
Internal pores, weak weld line interfaces, and uneven wall thickness jointly weaken pressure-bearing capacity; when the crystallinity of PEEK pipe fittings is uneven, local strength decreases; high-pressure working conditions amplify the influence of all microscopic defects.
Solution
①Fully dry and pack to eliminate internal pores; ②Optimize weld line position and strength through gate design; ③Control wall thickness uniformity and crystallization consistency; ④Implement 100% non-destructive testing screening for pressure-bearing parts.
Key Takeaway
The quality defense line of PEEK pressure-bearing parts lies in non-destructive testing; qualified appearance does not mean qualified interior; pores and weld lines are the two major roots of pressure-bearing failure.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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