Wood preservation facilities, ammoniacal copper zinc arsenate: chapter C, table 22

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.