One reason being that a level of condensed water is accumulated inside of the pot (some pots were vertical others horizontal) and maintained a fluid volume for displacement equal to or greater than the volume displacement of the instrument sensing the flow or pressure.The second reason for maintaining a liquid inside of the pot (were alsocalled chambers) was to prevent flashing of the liquid in the sensing line if a sudden temperature change of the steam is made. A dam inside of the pot prevented this flashing effect.
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M.p.panchal(Pmt Engineers)
C-6, Shreeji Estate,Nr. Telephone Exchange, N. H. No. 8, Naroda, Ahmedabad, Gujarat - 382330, India
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