Water Treatment Chemical Dosing Skid P&ID
This process P&ID shows a compact chemical dosing skid for water treatment. Raw water enters the flash mixer while coagulant leaves the chemical day tank through a diaphragm metering pump. FT-101 measures the chemical dosing flow and sends an electric signal to FIC-101. The controller moves fail-closed FV-101 through a pneumatic signal to regulate the chemical dose. The mixed water then enters a contact tank before leaving as treated water. The drawing makes the relationship between the process stream, chemical stream, and control loop clear without attempting to show every skid detail. Add duty and standby pumps, bunding, injection quills, sampling points, interlocks, and chemical-specific safety equipment when the installation requires them.
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Scenario
A treatment process doses coagulant into incoming raw water before mixing and
Key decisions
- Chemical source: Store coagulant in a day tank.
- Metering: Use a diaphragm pump for the dosing stream.
- Control: Measure chemical flow and adjust FV-101.
- Process path: Mix raw water and dose before the contact tank.
When to reuse this
Use this P&ID pattern for a basic liquid chemical dosing skid ahead of a treatment contact stage.
Frequently asked questions
Why use a diaphragm metering pump?
What does FIC-101 control?
What is the contact tank for?
Try the diagram makers.
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