Identify both gas routes
Vessel depressurization releases residual gas before refilling. At the receiving end, gas can also arrive with or after product depending on the transfer strategy. Map these routes separately on the process diagram. A silencer on one connection does not necessarily address noise or pressure at the other.
Avoid moving the problem downstream
The receiving tank must safely accommodate the incoming liquid and displaced gas under the actual operating conditions. A separator can help manage gas-liquid separation where appropriate, but it needs compatible dimensions, drainage and venting. Do not assume an existing storage-tank vent has sufficient capacity for a new cyclic transfer system.
Assess noise and maintenance
The effectiveness of a silencer depends on the flow conditions, pressure drop and contamination risk. Product carryover can foul components and change their behavior. Select accessible equipment and specify cleaning or replacement checks. Noise acceptance should identify the measurement position and operating state, rather than use an unqualified sound figure.
Treat pressure and exposure as design questions
Vents should discharge to an appropriate location or treatment system, considering product hazards and personnel exposure. Qualified designers must review the protection and environmental requirements of the actual plant. During commissioning, inspect the complete sequence for unexpected backpressure, carryover and unstable receiver level. The aim is controlled gas management through the full route, not merely quieter equipment.
Further reading
General engineering guidance. Numerical examples are illustrative; project specifications and acceptance criteria are agreed for the actual duty.