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Wood preservation facilities, alkaline copper quaternary: chapter G, table 22

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Table 22. Additional Recommended Operating Practices for Maintenance, Cleanout and Shutdown of Treatment Systems (ACQ Preservatives)

(Use in conjunction with Part I, Chapter A - General Recommendations for All Wood Preservatives, Table 22.)

Operation Recommendations
Equipment maintenance Objective: To ensure that equipment is maintained in a manner that will minimize releases of preservative chemicals and minimize worker exposure to them and their by-products
Alarms and safety devices

Equipment:

  • Valves must be tested every 6 months and replaced as required.
  • Test tank vents at least once a year to ensure they are not blocked.

Alarms:

  • Off-loading area: Test the manual alarm on a weekly basis and prior to the delivery of concentrate.
  • Chemical storage area:
    • The circuitry of the tank’s high-level alarm and the 24-hour monitoring alarm should be tested weekly, and probes should be checked every 12 months.
    • The function of all manual emergency alarms should be tested weekly.
    • The containment high-level alarm should be tested every 6 months or within 6 months of a routine alarm sounding.
  • Chemical mixing systems:
    • The circuitry of the high-level alarm should be tested weekly, and probes should be checked every 12 months.
  • Treatment process systems:
    • The high-level alarms of the sumps should be tested weekly.

All test details should be recorded (documented).

Prior to cleanout:

  • Thoroughly purge all ammonia vapours and provide effective ventilation.
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2017-09-10