Selection of CNG stainless steel pipes
Thread Content
The exhaust pressure at the CNG outlet is 25 MPa. Currently, stainless steel pipes with an outer diameter of 27 mm are being used; what wall thickness is required to withstand this pressure? Are there any standards or calculation formulas for this?
The most commonly used is 27mm*6mm
Check the standards; consult the pipeline selection manual based on pressure
Based on purely theoretical calculations, a stainless steel tube with an outer diameter of 27 mm and a wall thickness of 2.6 mm can withstand a pressure of 25 MPa. The 27mm*6mm mentioned on the 3rd floor can be used.
DN20 SCH80S.... is sufficient. . .
5 layers is enough; the thicker, the better for extra safety
I also used DN20 pipes with a wall thickness of 25x3.5
This post was last edited by kcmwangfang on 2015-12-5 at 14:32. The stress capacity is calculated as (tensile strength * wall thickness * 2) divided by the inner diameter of the pipe. The tensile strength for 304, 304L, and 321 materials is 520 MPa, while that for 316 and 316L materials is 485 MPa. For example, for a 304 pipe with dimensions of 27*6, the calculation is 520*6*2 divided by 15, which equals 416 MPa; in other words, 41.6 megapascals. A value of 27*5 can also be used