Support Friction

Osama · **Joined:** Thu Apr 02, 2009 9:38 am **Posts:** 59

My nozzle loading fails if i use support friction coefficient as 0.4 in static analysis for rotation equipment piping.

But same nozzle pass (in restraint reactions report i.e. Fx,Fy,Fz and Mx,My,Mz) when above support friction is ignored or inputted as zero.

Here i want to confirm that does API STD-617 criteria says that the load calculated with the restraint but without the friciton is acceptable.

Waiting ?

In general
The support friciton in a piping system can prevent the pipe from expanding freely, thus creating a higher stress in the pipe and higher load on the connecting stationary/rotation equipment.

Osama · **Joined:** Thu Apr 02, 2009 9:38 am **Posts:** 59

Waiting for reply

Is there anyone who listens me :-)

akonrad · **Posted:** Mon Apr 12, 2010 1:56 pm

Osama,
I don't know API 617 but I would not accept a design which assumes a pressure vessel free to move under piping expansion. For a whole lot of reasons.

Osama · **Joined:** Thu Apr 02, 2009 9:38 am **Posts:** 59

Dear Konrad,

I meant i read in the software help that we can take friction coefficient as minimum as 0.2 or even 0.1 if we use low friction sliding plate at support contact surface. We can also reduce the friction almost completely by using pinned restraint system, such as struts.

This is all which i need to confirm Konrad.

But i didnt get any help relevant to my question.

Osama

akonrad · **Posted:** Tue Apr 13, 2010 9:27 am

Osama, just out of curiosity: what software are you talking about?

Osama · **Joined:** Thu Apr 02, 2009 9:38 am **Posts:** 59

Its AutoPIPE Plus

Support Friction

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