Hello fellow stressers!!

How do you consider applying the force in the simplified static analysis system with DLF? Is it all the forces are acting at the same time in the elbow (F1)? Or one a time? (F1,F2...Fn), where n is the number of bends? or both cases?

Warm Regards,

A single slug impacts only one elbow at any given time (assuming the slug length is less than the straight length of pipe between two elbows). Each elbow should be its own load static load case.

In a dynamic response spectrum analysis, again each elbow should be its own dynamic load case. This is because a response spectrum analysis is performed in the "frequency domain", and "time" isn't a factor in the loading.

In a dynamic time history analysis, the load on all the elbows can be addressed in a single load case because the timing (when the slug impacts each elbow) is considered.

Thanks Richard. It makes sense.

Warm Regards,