Atmospheric Relief Valves
Completion Date
2011
Services
Plant Design
Civil / Structural
Industry
Refining & Chemical
Location
South East
C&I provided the detailed design for this project,which incorporated a 1,600’ free-draining flare line 8” to 12” in diameter. The objective of this project is to obtain compliance with the client’s standard practices for pressure protection and disposal. There are three pressure vessels with atmospheric relief valves that do not meet established criteria to allow the discharge to continue to vent to the atmosphere and should be routed to a closed system. For the relief valves that will be routed to a closed system, the scope of the project will involve installation of a new flare sub-header from south of the solvent truck rack to an existing flare sub-header in the Petrochem Area. The tailpipes of the three relief valves will be routed to the new sub-header. There are five relief valves that currently discharge to the atmosphere that will be addressed through alarming and instrumentation. These relief valves have low relief valve set pressures, which precludes routing the discharges to a closed system. For the relief valves that will continue to be routed to atmosphere, the scope is to install signage warning of potential danger and audible and visual alarms, which trigger using existing pressure transmitters prior to the relief valves lifting.