(a) we were told the gas vessel instrumentation should have an inlet valve. On the P&ID, inlet valve HV 107 is provided to manually regulate gas flow into the vessel.
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(b) A pressure transmitter and a pressure indicator is to be provided to indicate inlet pressure. On the developed piping and instrumentation diagram, PT 101 and PI 101 are provided for this purpose. PT 101 measures the inlet pressure and sends the measured value via electrical signals to the pressure indicator, PI 101
(c) A flow transmitter and a flow indicator are to be provided to measure and indicate flow. Also, instrument for alarming high and low flow rates are to be included. On the developed P&ID, FT 102 measures the flow and FI 102 indicates the flow. Also FAH 102 is a flow alarm switch for indicating high flow rates while FAL 102 is for indicating low flow rates