Vertical Loads:
Generally Pipe size 10" Lines and below are given as UDL and other larger bore dia as point load.

Incase you want actual UDL for Pipe size 10" and below pipes,
calculate the dead weight,operating and hydro weight considering pipes to be supported as simply supported beam.
Based on the intermediate beams(span) and pipe rack width (occupied width) covert reaction to UDL either KN/m2 or KN/m.
In case of vertical load (UDL) for Dia 10" and below a minimum of 1.75KN/m2 may be used.

Horizontal loads:
For high temperature lines(typically greater than 200 Deg C) and Pipe size greater than 10", perfrom stress analysis to get lateral loads and axial loads,
For other lines(<=10") use limiting friction value to get horizontal loads.


Hope this helps.