recently I read a job design specification for pipinig stress . this specification said that "As a general rule the friction forces acting on the base plate of in/out-lines of rotating equipment shall be considered along with momentum and thermal forces in the nozzle. For these equipment,when horizontal movements are less than 5mm and sliding plates are provided, friction loads can be excluded in the evaluation of loads in mechanical equipment nozzles."
I want to know other engineer how to deal with the friction loads in rotating equipment nozzles? if there is a spring support?