Control system for filling tanks with saturated liquids

Details Control system for filling tanks with saturated liquids Control system for filling tanks with saturated liquids

F - Mech Eng,Light,Heat,Weapons

17

C

F17C 13/02 (2006.01) B60K 15/04 (2006.01) F17C 5/02 (2006.01)

Patent

CA 2113845

The invention described in the patent is an automatic control system which provides monitoring, supervision, and control of the process of filling of a tank or container with a liquid, where at the temperature of operation the vapour pressure of the liquid is at or above atmospheric pressure. The invention provides an improved method of carrying out the process of filling of tanks with liquids such as ammonia, chlorine, propane, liquefied petroleum gas or any other liquid with high vapour pressure at the temperature of operation. The main advantage provided by the apparatus and method of the present invention is that there is offered an improved method for automatically stopping the filling process at the correct point, so as to avoid a possibly hazardous overfilled condition. Some of the methods currently in use require a mechanical valve which senses liquid level in the tank and is supposed to dose so as to stop flow to the tank when the liquid has reached the maximum allowable level. The mechanical valve may malfunction and allow overfilling of the tank, and the fact that the valve is malfunctioning may not be readily apparent. The improved apparatus and method of the present invention do not require a mechanical valve of the type described above. Further there is a self-checking and self-monitoring capability so that users of the apparatus and method are warned of any malfunction.

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