FLUID INJECTION SYSTEMS FOR FLUID LINE PURGING

A fluid injection system (100) can include a main flow line (101), a primary flow line (103) connected to the main flow line, a primary flow valve (105) disposed on the primary flow line and configured to selectively allow injectant flow to the primary flow line, a secondary flow line (107) connected to the main flow line, and a secondary flow valve (109) disposed on the secondary flow line and configured to selectively allow injectant flow to the secondary flow line. The system can include a primary purge branch (111) in fluid communication with the primary flow line and connected to a purge gas line, a primary purge valve (115) disposed in the primary purge branch between the primary flow line and the purge gas line, a secondary purge branch (117) in fluid communication with the secondary flow line, and a secondary purge valve (119) disposed between the purge gas line and both of the primary purge branch and the secondary purge branch.