yes a Pressure network is 'linked' to a surface IF you assign a surface for the rule to use.
You will discover some ill effects from this....mostly if the surface has bad elevations and or snapping to wrong Z
also there is no similar tool for pressure networks, like gravity pipes for Apply Rules to update a network.
from help:
Important: When pressure network parts do not have an associated reference surface, or if the parts are located outside the boundary of their reference surface, the validation system will display one of the following messages:
Some or all of the selected parts were not validated because they do not have a reference surface.
Some or all of the selected parts were not validated because they are located outside the boundary of the reference surface.
Minimum Depth of Cover
Checks the pressure network for the specified minimum depth. Pressure networks that are too shallow are flagged with solution tips.
Maximum Depth of Cover
Checks the pressure network for the specified maximum depth. Pressure networks that are too deep are flagged with solution tips.
so it doesn't FIX issues it only flags them, whereas gravity networks ARE fixed for depth violations (just not min/max length rules)