Dear friends,

I am working on a Compressor discharge nozzle. The nozzle is inclined by 56deg with respect to vertical. At the first elbow from the nozzle, I have provided line stop. With this support configuration the nozzle loads are well within allowable.
Due to layout constraints, the elbow support is not possible. so when I moved this line stop just after the elbow the nozzle loads are increasing drastically. There is not much expansion due to this offset of support, but still the loads at nozzle are coming very high. Why is it so? Is there any other way we can reduce the nozzle loads?

Dear Muth
Theoretically you can reduce load by increasing vertical leg.
Since in your case stop at elbow giving you best result, I suggest to put rigid strut at elbow & connect it with structure at practical location. For compressor line specially if it is with higher pipe size using a rigid strut is better choice.

Regards
Habib

Well, kind off nothing to do today... can you show me the sketch of that system? Maybe I cn help,.

Regards!

If you are as close to the nozzle as I suspect (i.e. nearly fitting make up), you are going to have a tough time putting an effective directional anchor that close that is going to be real world stiff enough to relieve loads from the compressor nozzle.

My suspicion comes from the fact that you said moving the line stop to downstream of the elbow dramatically increases the loads. If you set the CNODE anchor stiffness at the compressor flange to 0, you are probably going to see very small movements from the anchor. However, the stiffness of the compressor and the stiffness of the short pipe run multiply that displacement to give you large loads in Caesar.

Muth r,

I reckon Edward is dead right. What you had initially was just a numerical fix, not a realistic solution. You probably need to re-route and add some flexibility in association with restraints that can actually be constructed.

Mr. Muth

It will be more appropriate if you will provide some sketch for us to see.. What I imagine to your system is instead of installing line stop you designate guide instead.. am I right? if this is true then your system is experiencing rotational load. you cant put support in your elbow but maybe you can put a dummy pipe + stopper on it. Or put your stopper before the elbow as close as possible to the elbow.

Check the source of deflection and you will understand the load.

Regards!

Dear Friends,

Thankyou for your valuable replies. Sorry for the late response, just today i am resuming my work after a long vacation.

thanks & Regards,

Muthu