A pipe system is the same as a pipeline in a facility and main equipment like 
column, heat exchanger, reactor, pressure vessel or pump is entered as to-object 
for this pipe system. It is usually not recommended to enter to-object relations 
on secondary equipment (valves, ventilation, drains, instrument measuring 
equipment and so on) on detailed pipe segments. It's more common to be used for 
main equipment and pipe systems. This enables work and preventive maintenance to 
be monitored and planned by using main equipment and all pipe lines that are 
arriving to it. For example, monitor and plan all work for a pressure vessel and 
pipe lines that are arriving to the pressure vessel.
This structure could be created in two different ways: