| 摘要 |
Zeres is a device that enables to emptying all types of cargo; from a cargo tanker vessel or a floating production and storage unit (shipping and offshore), completely after the use of a conventional pump and stripping process for the tank has finished. Current tank set up design arrangement for most installations today are not capable for complete emptying all residuals in the tanks. State of the art for emptying and recover residuals from a cargo tank will not give satisfying results. After a conventional pumping and stripping operation for a cargo tank are complete, the residual cargo located in the pump suction well for the cargo tank will be drained into the cargo collector volume (1). The cargo collector volume (1) is a main part of zeres and is located below the pump suction well on the cargo tank floor. Pressurized inert gas will be applied to the inlet pipe (3). The actuator volume (9) will be pressurized and the piston will move the seal plug (2) upwards for closing of the cargo collector volume (1). Inert gas will then start to flow through the flow restrictor orifice (5), further through the check valve (12), and finally out to the cargo collector volume (1). The orifice (5) represents a particularly resistance and ensures that the piston (2) moves and seals prior to the gas pressure build-up in the cargo the collector volume (1). As the pressure increases in the cargo collector volume (1), the cargo, which represents a higher density than the inert gas will be forced in to the cargo outlet pipe (4). The check valve (5) prevents cargo to leak inside the actuator volume (9) when the system is not pressurized. The operation continues until all residual cargo in the cargo collector volume (1) is forced out through the cargo outlet pipe (4). When gas pressure in the inlet port for inert gas (3) is released, the piston returns by the force of the spring (7) and ensures that the sealing plug (2) will open for refill of cargo from the suction well into the cargo collector volume (1). This sequence will be repeated for as many times as required for emptying all residual cargo in the pump suction well. |
