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38 Terms for Pipes and Fittings(2)

Date:2024-07-04View:57Tags:Stainless steel pipe,ERW steel pipe,Sprial steel pipe

16. 20℃, 50-year confidence lower limit (σLCL):


A stress value used to evaluate material performance, which refers to the confidence lower limit of the predicted long-term strength of the pipe made of the material under internal water pressure at 20℃ and 50 years with a confidence level of 97.5%, in MPa.


17. Long-term hydrostatic strength (σLTHS):


Indicates the average strength predicted at temperature T and time t (the average strength refers to the confidence lower limit of the material strength when the confidence level is 50%), in MPa.


18. 20℃, 50-year long-term strength (σLTHS):


The average strength or predicted average strength of the pipe under water pressure at 20℃ for 50 years, in MPa.


19. Environmental stress cracking:


The phenomenon of accelerated stress cracking due to environmental conditions. The environmental stress cracking resistance of the material is often expressed by ESCR.


20. Degree of crosslinking:


A physical quantity indicating the degree of crosslinking. When cross-linking occurs between polymer chains, it is expressed as the average number of cross-linking units per polymer molecule. It is also called cross-linking point density and cross-linking index. It is usually expressed by gel content.


21. Ductile failure:


Destruction accompanied by obvious awakening deformation.


22. Brittle failure:


Destruction without obvious plastic deformation in the rupture area.


23. Penetration failure:


A form of failure in which the pressurized fluid in the pipe seeps out of the pipe wall to form visible loss but no obvious cracking occurs.


24. Hoop stress:


Stress along the circumference of the pipe caused by internal pressure in the pipe wall.


25. Burst pressure:


The maximum pressure before the pipe ruptures in the hydrostatic burst test of the pipe.


26. Failure temperature:


The highest temperature that occurs when the pipeline system exceeds the control limit.


27. Structural wall pipe:


A general term for pipes with composite wall structures composed of multiple layers of materials and pipes with special-shaped wall structures such as open ribs, closed ribs (hollow), etc.


28. Special-shaped wall pipe:


A general term for pipes with smooth inner wall and spiral, annular or ribbed outer wall.


29. Double-wall corrugated pipe:


The inner wall is smooth and flat, the outer wall is trapezoidal or arc-shaped corrugated ribs, and the inner and outer wall corrugations are hollow special-shaped pipes.

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