3   De-aerator system

3.1   Introduction


The de-aerator and associated plant accept feed from the LP feed train to heat and de-aerate the water and then supply it as feedwater to the boiler feed pumps.

The de-aerator storage tank also acts as a receiving vessel for the HP drains and boiler feed pump leak-offs. The term de-aerator in the context of this section is taken to include the de-aerator head, the storage tank and associate plant. The feed pump suction pipework is also included in this section, as its configuration has an important effect on de-aerator behaviour under transient conditions.


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