If you know that the pipe will not slip at these friction points and you want to include this "not slipping" in your dynamic model, you could add restraints to the input model to prevent this slipping. You are not installing these, just adding them to your model to product a desired result. These restraints are my "artificial guides".
If 100 works for you keep on using it. Just be sure the results "look" right. It's more qualitative than quanitative at this point. I've looked at a lot of models it is my opinion that the results are not too sensitive to the entered value. I think it's more related to the effective system stiffness and mass around these supports - as the system stiffness increases, this factor (I guess) should be bigger.