Method for assembling and disassembling marine riser and auxiliary lines and well pressure control system

A well pressure control system, comprising:

• a riser coupled at one end to an upper end of a lower marine riser package and blowout preventer assembly, a lower end of the lower marine riser package and blowout preventer assembly coupled to a wellhead disposed on top of a well, the riser extending to a platform on the surface of a body of water;
• at least one auxiliary line extending from proximate the bottom of the body of water to the platform, the at least one auxiliary line disposed at a selected lateral distance from the riser;
• and
• at least one fluid line hydraulically connected to a lower end of the at least one auxiliary line and connected to a part of the lower marine riser package and blowout preventer assembly.