Time-pressure-filling system for liquid drug products

A surge vessel for use in a time-pressure-filling system for filling liquid drug product into containers, wherein the surge vessel is configured for single use and is at least partially made of a rigid plastic material, the surge vessel comprising:

• a rigid cylindrical vessel sidewall;
• a rigid vessel bottom plate;
• a rigid vessel top plate;
• a supply pipe penetrating the rigid vessel bottom plate and having a portion protruding into an interior space of the surge vessel, wherein the supply pipe has an inlet connecting branch protruding from the rigid vessel bottom plate outside the interior space for connecting a supply line to the supply pipe, whereby the liquid drug is supplied to the surge vessel;
• an outlet connecting branch protruding from the rigid vessel bottom plate outside the interior space for connecting at least one dispensing line;
• and
• a pressure control branch protruding from the rigid vessel top plate outside the interior space for connecting at least one pressure control line.