Cylinder Treatment Panel is deployed in a Jakarta gas plant. This local monitoring and control panel is installed with Siemens S7-1200 PLC and Hakko MONITOUCH V8 series HMI to monitor and control gas cylinder cleaning process. It allows user to the clean up to 64 units of cylinders each time.
Design Concept
There are 3 solenoid valves in the system to perform the cylinder cleaning process. User is able to input total number of cycles for the cleaning process. Each cycle consist of 3 stages, they are vacuum stage, N2 pressurize stage and pressure release stage.
Stage 1
- Vacuum Valve is open to start vacuuming the entire system. When the desired vacuum level is achieved, the Vacuum Valve is then close and proceed with stage 2.
- N2 Pressurize Valve is open to pressurize the cylinders. When the desired pressure is achieved, the N2 Pressurize Valve is then close and proceed with stage 3.
- Release Valve is open to release the N2 in the cylinders. When the pressure drop to 0 Bar, the Release Valve is then close and completed 1 cycle.
- The system is then continue with cycle 2 stage 1 until the desired total cycles reached.
- Any of process alarms will be siren to alert the user and they will be logged in the alarm history logger. There is also auto shutdown, local EMO shutdown for safety purpose.
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