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3.1.3 Chlorine Dosing

This document outlines the installation, operation, and maintenance procedures for the chlorine dosing system located at the Lake Bennett Estate bore infrastructure. It includes a full breakdown of the system’s components, control methodology, safety considerations, and troubleshooting steps.

System Description

The chlorine injection system is an inline dosing mechanism connected to the bore supply line. It is triggered by flow-based pulse signals generated by a mechanical water meter. The system is designed to deliver precise chlorine dosing proportional to water usage, ensuring effective water treatment for potable and non-potable applications.

Component Overview

Water Meter and Pulse Sensor

A mechanical inline water meter generates electrical pulses relative to flow. These pulses are transmitted via low-voltage cable to the dosing pump located inside the chlorination shed.

Water Meter

Dosing Pump

A Prominent Beta 4 chlorine metering pump receives the pulse signal and dispenses chlorine solution accordingly.

Item Detail
Serial No. 371815956
Dosing Rate Adjustable 0–100% via front panel knob
Pulse Source Selector (internal/external)
Pulse Ratio Configurable for higher flow accuracy
Power 240 V AC from GPO in chlorination shed
Continuous Mode For priming or bleeding

Manufacturer Resources:

Dosing Pump

Chlorine Storage Tank

Item Detail
Capacity 100 L UV-resistant plastic tank
Low-Level Protection Float sensor cuts power to pump below ~10 L to prevent dry running
Filling Manual via sealed top access cap
Containment Positioned within a bunded spill containment enclosure

Chlorine Tank

Injection Point

Chlorine is injected into the bore main just downstream of the flow meter. Tubing is secured and rated for high-pressure delivery.

Injection Point

Operating Principles

  1. Water flows through the mechanical meter, generating electrical pulses.
  2. Each pulse is received by the Beta 4 dosing pump.
  3. Based on the pulse ratio and dosage rate, chlorine is injected into the bore line.
  4. The system operates passively — chlorine delivery is fully synchronized with bore output volume.

Maintenance Procedures

  • Daily
    • Confirm chlorine level is above the 10 L cutoff
    • Check for signs of air in dosing lines
    • Confirm pump is responding to pulses
  • Weekly
    • Test output concentration using water sampling
    • Visually inspect tubing and injection points
  • Monthly
    • Check operation of the low-level sensor
    • Flush or replace any clogged sections of line
  • Quarterly
    • Verify bund tank is clean and free of residues

Troubleshooting

Problem: Inadequate Chlorine Output

Symptoms:

  • Low chlorine residual detected during routine testing
  • Dosing pump appears to run, but injection is weak or inconsistent

Likely Cause:

  • Air trapped in suction or discharge lines

Bleeding Procedure

Safety Warning

Always wear full PPE including gloves and a face shield.

  1. Confirm Chlorine Level Open the top cap and visually inspect fluid level. If below 10 L, refill (see Chlorine Refill Procedure).
  2. Set Pump to Manual Prime
    • Set dosing knob to 100%
    • Set pulse source to “Internal”
    • Set pulse rate to 100% (continuous operation)
  3. Bleed the Output Line
    • Carefully disconnect the injection line from the bore water main end
    • Allow chlorine to pulse through until all air is purged
    • Observe strong, consistent pulses without bubbles
  4. Return to Normal Operation
    • Reconnect output line securely
    • Set pulse source back to “External”
    • Adjust dosing knob to target setting (e.g. 25%)
  5. Verify Operation
    • Observe LED pulse indicators (double flash confirms external sync)
    • Sample water post-injection and verify chlorine level

Safety and Containment

  • The entire dosing system is mounted within a bunded containment enclosure to mitigate spills or leaks.
  • Only trained personnel should handle chlorine. A full PPE kit (face shield, gloves, long sleeves) must be worn when:
    • Refilling chlorine
    • Bleeding the system
    • Performing maintenance
  • Maintain clear access to the spill containment area for inspection and cleaning.
  • Ensure the chlorination shed remains well-ventilated at all times.

PPE Safety

Chlorine Refill Procedure

  1. Wear PPE Face shield, gloves, and long-sleeved protective clothing are mandatory.
  2. Open Fill Cap Unscrew the large black lid atop the chlorine tank.
  3. Add Chlorine Pour chlorine slowly from a sealed 20 L drum supplied by Harvey Distributors. Top up to full capacity (100 L).
  4. Secure Lid Replace and tighten the tank cap to prevent evaporation and contamination.
  5. Inspect for Spills Check bund for drips or overflow. Rinse and dilute if necessary.

Recommended Product

Sodium Hypochlorite 12.5% (20 L drums)

Supplier: Harvey Distributors

SDS and Product Datasheet: [Insert link here]

Appendix A — Equipment Specifications

Component Model Notes
Dosing Pump Beta 4 Ser. No. 371815956, External pulse input
Chlorine Tank 100 L HDPE Bunded, with float switch
Water Meter Mechanical Inline Pulse output (2:1 ratio)
Tubing Chemical-rated Rated for chlorine and bore pressure
Power Supply 240 V AC GPO in chlorination shed

Version Control

Version Date Description
1.0 2025-10-06 Initial Release

Next Review Date: 2026-04-06