Standard Operating Procedure (SOP)

Here’s a sample Standard Operating Procedure (SOP) for the Operation and Cleaning of a Distilled Water Unit. This can be adapted to your specific equipment and industry standards (e.g., pharmaceutical, laboratory, or industrial use).

1. Purpose

To ensure the proper operation and cleaning of the distilled water unit to maintain consistent production of high-purity distilled water and avoid contamination.

2. Scope

This SOP applies to all personnel responsible for operating and maintaining the distilled water unit in [Department/Area Name].

3. Responsibilities

• Operator: Responsible for daily operation and cleaning of the unit.

• Maintenance: To assist in troubleshooting and repairs.

• Quality Assurance: To verify records and ensure compliance.

4. Equipment and Materials

• Distilled water unit

• Personal protective equipment (PPE): gloves, goggles, lab coat

• Cleaning agents (e.g., citric acid, sodium hypochlorite if applicable)

• Distilled or deionized water

• Cleaning brushes, lint-free cloths

• Logbook or batch record sheet

5. Procedure

5.1 Operation Procedure

1. Pre-Check:

   • Ensure unit is clean and all connections are intact.

   • Check for water supply availability.

   • Ensure power is on and system pressure is within range.

2. Start-Up:

   • Switch on the main power.

   • Open the water inlet valve.

   • Set the temperature and flow rate as per standard settings.

   • Allow the unit to run until distilled water is collected.

3. Monitoring:

   • Monitor temperature, pressure, and flow rate periodically.

   • Ensure there are no leaks or unusual noises.

4. Shutdown:

   • Turn off the heating element and allow the unit to cool.

   • Switch off the main power.

   • Close water inlet valve.

5.2 Cleaning Procedure

Daily Cleaning (End of Day)

1. Ensure the unit is turned off and cooled.

2. Disconnect the power supply and water source.

3. Drain remaining water from the system.

4. Wipe down external surfaces with a damp cloth.

5. Rinse internal parts with distilled water if accessible.

Weekly Cleaning (Deep Clean)

1. Prepare a mild citric acid solution or manufacturer-recommended cleaning agent.

2. Circulate the solution through the system for the recommended time.

3. Rinse thoroughly with distilled water at least 2–3 times.

4. Wipe external parts and allow to air dry.

Monthly Descaling (If Required)

1. Use a descaling solution approved by the manufacturer.

2. Circulate and then rinse thoroughly with distilled water.

3. Record cleaning in the logbook.

6. Precautions

• Always wear PPE during cleaning and operation.

• Do not operate the unit without water.

• Avoid using tap water for rinsing.

• Never open hot or pressurized components.

7. Documentation

• Maintain a daily log for operation hours and output volume.

• Record all cleaning and maintenance activities with date, time, and signature.

8. Reference Documents

• Manufacturer’s manual

• Maintenance logs

• Safety data sheets (SDS) for cleaning agents.

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