| 摘要 |
In connection with a cargo discharge pump (6) that is submerged within a cargo tank (2), a stripping system that is utilized after most of the cargo has been pumped out of the tank by the discharge pump. An auxiliary tank (10) is arranged near the bottom of the discharge pump (6). Mounted at the bottom of the auxiliary tank are two non-return valves (11, 12), opening in opposite directions of flow. A suction line (13) is connected to one of the non-return valves (11) and extends down to the pump well (4) in the cargo tank (2). The other non-return valve (12) is connected to a line (14) for delivery of the cargo above deck level. A source of partial vacuum, for example a water ring pump (18), is mounted on deck for utilization by several discharge pumps (6). Mounted on the suction side of the water ring pump (18) is a valve means (17) which can be automatically controlled by a timing mechanism or in response to a partial vacuum in the suction line. The valve (17) is also connected to a pressurized gas system (21, 22). Alternating conditions of underpressure and overpressure within the auxiliary tank (19) cause any cargo remaining in the well (4) to be suctioned into the auxiliary tank, and to be forced to flow from the auxiliary tank up above deck through a discharge line (14). The components of the system are mounted on the discharge pump and the entire unit can be passed through the deck opening (5) for utilization/removal of the discharge pump. |
