Corrosion protection system and pump device with the same

Abstract

The life of a sacrificial anode for use in a pump device, such as a seawater pump, is extended, thus extending the life of a corrosion protection system of the seawater pump device. A pump device includes corrosion system including: a measurement unit located at a portion of a column pipe to be immersed into seawater; and a temperature control device located at an installation site of the pump device. In this corrosion protection system, a sacrificial anode electrically conductive with the column pipe and capable of being controlled in temperature is attached through a heating/cooling unit and a thermal conduction sheet to the column pipe. The temperature control device is configured to control, based on the temperature of the sacrificial anode measured by the measurement unit, the temperature of the sacrificial anode using the heating/cooling unit attached through the thermal conduction sheet to the sacrificial anode.

1 . A corrosion protection system comprising:
 a metallic member to be protected against corrosion;   a sacrificial anode electrically conductively attached to the metallic member and capable of being controlled in temperature; and   a temperature control unit configured to control the temperature of the sacrificial anode,   wherein the metallic member to be protected against corrosion and the sacrificial anode are disposed in an electrolyte.   
     
     
         2 . The corrosion protection system according to  claim 1 , wherein the sacrificial anode includes a heating/cooling unit configured to at least heat or cool the sacrificial anode, a first temperature detector configured to measure the temperature of the sacrificial anode is attached to the sacrificial anode, and the temperature control device is configured to control, based on the temperature measured by the first temperature detector, the temperature of the sacrificial anode using the heating/cooling unit which the sacrificial anode includes. 
     
     
         3 . The corrosion protection system according to  claim 1 , wherein the sacrificial anode includes a heating/cooling unit configured to at least heat or cool the sacrificial anode, a first temperature detector configured to measure the temperature of the sacrificial anode is attached to the sacrificial anode, a second temperature detector configured to measure a temperature of the electrolyte is disposed in the electrolyte, and the temperature control device is configured to control the temperature of the sacrificial anode using the heating/cooling unit so that a difference between the temperatures measured by the first temperature detector and the second temperature detector is in a predetermined range. 
     
     
         4 . The corrosion protection system according to  claim 1 , wherein the sacrificial anode includes a heating/cooling unit configured to at least heat or cool the sacrificial anode, a first temperature detector configured to measure the temperature of the sacrificial anode is attached to the sacrificial anode, a current detector configured to measure a value of current flowing between the sacrificial anode and the metallic member to be protected against corrosion, the temperature control device previously stores a relation between the temperature detected by the first temperature detector and an allowable range of currents detected by the current detector, and the temperature control device is configured to control the heating/cooling unit using a relation between the detected temperature and the detected current so that the current detected by the current detector is in the allowable range. 
     
     
         5 . The corrosion protection system according to  claim 1 , wherein the electrolyte is seawater, a material of the metallic member to be protected against corrosion is stainless steel, a material of the sacrificial anode is zinc alloy, and the temperature of the sacrificial anode is controlled to be more than 30° C. and less than 50° C. 
     
     
         6 . The corrosion protection system according to  claim 2 , wherein the electrolyte is seawater, a material of the metallic member to be protected against corrosion is stainless steel, a material of the sacrificial anode is zinc alloy, and the temperature of the sacrificial anode is controlled to be more than 30° C. and less than 50° C. 
     
     
         7 . The corrosion protection system according to  claim 1 , wherein the electrolyte is seawater, a material of the metallic member to be protected against corrosion is stainless steel, a material of the sacrificial anode is carbon steel, and the temperature control device is configured to control the temperature of the heating/cooling unit so that the sacrificial anode has a lower temperature than the metallic member. 
     
     
         8 . The corrosion protection system according to  claim 2 , wherein the electrolyte is seawater, a material of the metallic member to be protected against corrosion is stainless steel, a material of the sacrificial anode is carbon steel, and the temperature control device is configured to control the temperature of the heating/cooling unit so that the sacrificial anode has a lower temperature than the metallic member. 
     
     
         9 . A pump device including the corrosion protection system according to  claim 2 , wherein the metallic member to be protected against corrosion is a casing of the pump device and the sacrificial anode is electrically conductively attached to a portion of the casing to be immersed into the electrolyte. 
     
     
         10 . A pump device including the corrosion protection system according to  claim 3 , wherein the metallic member to be protected against corrosion is a casing of the pump device and the sacrificial anode is electrically conductively attached to a portion of the casing to be immersed into the electrolyte. 
     
     
         11 . The pump device including the corrosion protection system according to  claim 9 , wherein the electrolyte is seawater, a material of the casing is stainless steel, a material of the sacrificial anode is zinc alloy, and the temperature control device is configured to control the temperature of the sacrificial anode to be more than 30° C. and less than 50° C. 
     
     
         12 . The pump device including the corrosion protection system according to  claim 9 , wherein the electrolyte is seawater, a material of the casing is stainless steel, a material of the sacrificial anode is carbon steel, and the temperature control device is configured to control the temperature of the sacrificial anode so that the sacrificial anode has a lower temperature than the casing.