Could someone shed some light on this topic?

My understanding from a pipe stress webinar some time back (I think Dave was presenter?), that we shouldn't (or can't) take credit for friction to rescue our pipe and equipment.

Some client stress specifications call for this.

It's specifically a code requirement (B31.3) to consider the harmful effects of friction.

However, I think I might be misremembering whether or not frictionless is strictly a code requirement. However, I do not see that it is, unless I'm missing something.

Thanks