Propane blending system control description. The following describes how a propane blending system operates. Refer to the PID in Appendix 4. The system labels SVI, PRV1 etc refer to items on the diagram. Table : List of devices to measure and control Device Description Type Range Comments Measures the temperature of the bulk T1 propane to understand PT100 30 how much heat is required Measures the temperature of the T2 propane gas, this is PT100 0 +20 controlled to maintain gas density Measures the temperature of the T3 blended biomethane and PT100 0 +20 propane to ensure it is within specification Propane vapour pressure, detects 4 to 20 PS1 switch whether supply pressure Bar is adequate Propane gas pressure, PS2 detects whether supply sensor 1 to 3 Bar pressure is as required Valve opens to allow SV1 propane liquid to pass to solenoid 12V DC the vaporiser opens to allow SV2 heating water to pass to solenoid 12V DC the propane tank A control signal telling the control valve to move Woodward L 10 – 32V DC FC1, input to a position allowing a 0.5 to 4.5V series power feed given amount of propane gas to pass A position signal to FC1, output confirm that the control Woodward L 0.75 to (position) has moved to the series 4.25V position as instructed Propane flow meter, M1 measures the propane FCI ST75 series 4 20mA – gas flow Pump to deliver heating 230V P1 water to the propane pump 0.25kW vaporiser max
Propane blending system control description. The following describes how a propane blending system operates. Refer to the PID in Appendix 4. The system labels SVI, PRV1 etc refer to items on the diagram. Table : List of devices to measure and control Device Description Type Range Comments T1 Measures the temperature of the bulk propane to understand how much heat is required PT100 30 T2 Measures the temperature of the propane gas, this is controlled to maintain gas density PT100 0 +20 T3 Measures the temperature of the blended biomethane and propane to ensure it is within specification PT100 0 +20 PS1 Propane vapour pressure, detects whether supply pressure is adequate switch 4 to 20 Bar PS2 Propane gas pressure, detects whether supply pressure is as required sensor 1 to 3 Bar SV1 Valve opens to allow propane liquid to pass to the vaporiser solenoid 12V DC SV2 opens to allow heating water to pass to the propane tank solenoid 12V DC FC1, input A control signal telling the control valve to move to a position allowing a given amount of propane gas to pass Woodward L series 0.5 to 4.5V 10 – 32V DC power feed FC1, output (position) A position signal to confirm that the control has moved to the position as instructed Woodward L series 0.75 to 4.25V M1 Propane flow meter, measures the propane gas flow FCI ST75 series 4 – 20mA P1 Pump to deliver heating water to the propane vaporiser pump 230V 0.25kW max
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