Jelly Fish “attack” to intake of Circulating Water Pump (CWP) is happening every the rain season in Indonesia.
The Screens of CWP can’t handle to this attack, so we need local sailors to help us by install the nets to trap the jelly fish before entry the intake, and they will monitor the nets, repair if it broken for two months.
All is Rp 100.000.000,- ($10,000)
Picture below for information about trash rake mechanism which can not handle jelly fish attack.
Picture below for information about traveling screen mechanism which can not handle jelly fish attack.
Jelly Fish Attack can make Power Station trip as describes below
1. CWP trip due to real differential level high on travelling screen after full of jelly fish trapped on it. CWP discharge valve was slowly closing, with result some of sea water from CWP to condenser and closed cooling water.
2. Closed cooling water (CCW) temperature rise from 30C to 45C due to not enough cooling from cooling water system since partially circulation water flowing.
3. Steam turbine trip due to condenser vacuum protection trip after loss 2 vacuum pump and less cooling system of condenser.
4. Boiler trip (MFT) due to loss of reheat protection after differential fuel minus steam flow ratio more than 13% (over firing).
About Jelly Fish
Jellyfish populations that have shown clear increases in the past few decades are "invasive" species, newly arrived from other parts of the world: examples of regions with troublesome non-native jellyfish include the Black Sea and the Caspian Sea, the Baltic Sea, the eastern Mediterranean coasts of Egypt and Israel, and the American coast of the Gulf of Mexico.
Populations of some invasive species expand rapidly because there are no natural predators in the ecosystem to check their growth. Such blooms would not necessarily reflect over fishing or other environmental problems.
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