Small vent, impulse, and pilot lines are critical for the proper operation of regulators and safety systems, but they are often overlooked during leak testing.
Impulse lines
A small leak can alter the pressure perceived by the regulator and cause instability.
Pilot lines
A leak or loose connection can affect the operation of a pilot-operated regulator.
Vent lines
Connections must be tight, and the outlet must lead to a safe location.
Common failure points
Small compression fittings, unions, threaded connections, and vibration points require careful inspection.
Post-maintenance
If any small line has been disconnected, it must be mandatorily included in the final leak test.
