Ballast water treatment monitoring system
A method and system for taking a sample of ballast water. The method includes withdrawing a sample of ballast water via a tube inserted in a ballast water pipe, wherein the tube includes a sample inlet, and isokinetic flow is achieved via a pump that controls the flow of the sample ballast water through the tube inlet by comparing a flow of the ballast water pipe with a flow of the sample ballast water through the tube; and controlling the flow of water through the sample tube inlet when a flow of the ballast water pipe is sensed to be different; withdrawing a portion of the sample ballast water for testing; and returning remaining sample ballast water to the ballast water pipe.
1. A method for taking a sample of ballast water, comprising:
withdrawing a sample of ballast water via a tube inserted in a ballast water pipe, wherein the tube includes a sample inlet, and isokinetic sampling is achieved via a pump that controls the flow rate of the sample ballast water through the tube inlet by comparing a fluid velocity of the ballast water pipe with a fluid velocity of the sample ballast water through the tube;
controlling the flow of water through the sample tube inlet when a flow velocity of the ballast water pipe is sensed to be different than a velocity of the ballast water in the pipe;
withdrawing a portion of the sample ballast water for testing; and
returning remaining sample ballast water to the ballast water pipe.
2. The method of claim 1 , wherein the sample ballast water is withdrawn and returned via a pitot tube assembly comprising a housing and a wand inside the housing, wherein sample ballast water is withdrawn through the wand, and sample ballast water is returned via the housing.
3. The method of claim 2 , further comprising extending the wand from within the housing to reach a sampling location inside the ballast water pipe.
4. The method of claim 2 , wherein the wand seals against the housing, and sample ballast water is withdrawn from a location above the seal, and sample ballast water is returned below the seal.
5. The method of claim 2 , wherein the pitot tube assembly is attached to the ballast water pipe via an isolation valve.
6. The method of claim 1 , wherein a second pump is operated to withdraw a portion of the ballast water sample for testing.