zigzags
Structural
- Jul 26, 2012
- 3
Hi,
I have been asked to verify the design of an end cap for a pipe which will be acted upon by an internal pressure in the pipe. The end cap is to be screwed on to the end of the pipe with an ACME thread and has a Weco union seal ring. (for the above imagine a lid screwed onto a bottle or similar)
I understand that fundamentally I need to calculate the force on the end cap and then check the screw thread for stripping (i.e. shearing off) of the threads and check the pipe/end cap cross section for yielding. But I am not sure exactly how to do this. i.e. the safety factor that needs to be taken off the yielded stress (would you simply use 0.4 x Fy say for shear) of the material once I calculate the above mentioned stresses. I am also wondering what other checks and rules of thumbs should be adhered to.
I am from a structural background (sadly there is not anybody else who can do this so I have been lumbered with the job) and do not know what codes or specifications would stipulate these things. I have had a search around on the internet and cannot find information on this.
Any help would be greatly appreciated.
Thanks!
I have been asked to verify the design of an end cap for a pipe which will be acted upon by an internal pressure in the pipe. The end cap is to be screwed on to the end of the pipe with an ACME thread and has a Weco union seal ring. (for the above imagine a lid screwed onto a bottle or similar)
I understand that fundamentally I need to calculate the force on the end cap and then check the screw thread for stripping (i.e. shearing off) of the threads and check the pipe/end cap cross section for yielding. But I am not sure exactly how to do this. i.e. the safety factor that needs to be taken off the yielded stress (would you simply use 0.4 x Fy say for shear) of the material once I calculate the above mentioned stresses. I am also wondering what other checks and rules of thumbs should be adhered to.
I am from a structural background (sadly there is not anybody else who can do this so I have been lumbered with the job) and do not know what codes or specifications would stipulate these things. I have had a search around on the internet and cannot find information on this.
Any help would be greatly appreciated.
Thanks!