Various piping systems draw raw water from the sea chest or header piping. These systems provide water for engine cooling, fire protection, air conditioning, and refrigeration systems Cooling water lines leading from the intakes usually have a valve located on the suction side or near the sea chest, which can be closed to allow for specific system alignment. Most of the piping systems leading from the sea chest are operated continuously at velocities in excess of those required for settling and attachment so only their system valves are subject to clogging. Some of these piping systems (e.g., fire-fighting systems, air conditioning systems, etc.) stand idle for long periods of time, allowing an opportunity for zebra mussels to settle.
Although no reports of floating plant-based piping system clogging have been received, such instances have occurred at other facilities. The threat and seriousness of this type of infestation warrants the exercise of control strategies which include periodic operation of all systems, valves, and nozzles. In some cases, it may be prudent to replace standard piping with copper pipe and nozzles with self-cleaning nozzles.
Preventive Control Methods
Reactive Control Methods