Natural frequency

Hi

I'm analyzing lines connected to a compressor and I have a couple of questions,will be thankful if you help:
The system is too compact and the allowable of the compressor with high temp high pressure is 1.6 api. With one of nozzles in a funny angle.

I could achieve the allowables but
Min natural frequency is 5 hz
And i'm trying to put spring hanger on the elbow in pipe run connected to the funny angle, which is not a complete elbow, a trimed one.

I have checked lines in ope , sustain and when it is not connected but I am not sure about two items mentioned above.

Can you help me please.
Thanks

1. A sketch would help.

2. "Hangers" are not a good idea for compressor piping.