Wood preservation facilities, general recommendations: chapter A, table 22

Objective

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.

Recommendations

Maintain all equipment in good operating condition.
Cleaning equipment contaminated with preservative should be used only within the perimeter of the restricted/access control area of the facility.
Refers to applicable acceptable solution on maintenance in Division B, Parts 3 and 4 of the National Fire Code of Canada.
Should prepare explicit written maintenance procedures with assigned responsibility and accountability.
Follow all personnel safety precautions during maintenance procedures (Tables 6and 8).
Drain and/or clean wood preservation chemicals from equipment prior to maintenance:
- Equipment should be flushed thoroughly with water, with reuse of the water for work solution preparation (where applicable)
Use extreme caution if contaminated equipment must be welded (toxic fumes can be generated):
- Thoroughly clean surfaces to be welded.
- Wear a NIOSH-approved respirator when welding equipment contaminated with preservatives or their components.
- Provide good ventilation in the work area.
- Contain all sparks and remove flammable materials from the repair area.

Objective

Prevent accumulation of preservative solutions and sludge within the treatment system.
Ensure worker safety during cleanout operations.

Recommendations

Observe personnel safety precautions during all procedures (Tables 6and 8).
Wash down and/or scrape drip pads at regular intervals to prevent accumulation of preservative residues. (The cleanup frequency should be determined by site-specific factors including the probability of worker exposure, vehicle traffic and washdown by rain.)
- Recover and reuse drainage from drip pads or provide appropriate treatment or disposal.
Provide appropriate treatment for washwater (if applicable).
Routinely inspect sludge levels in all tanks and clean out if necessary.
- during cleanup, inspect gauge floats or similar equipment within tanks.
Routinely inspect treatment cylinders for sludge accumulation and clean if necessary:
- Purge cylinders with fresh air sufficiently to permit entry.
- If airborne concentrations are unknown, at, or above TLVs, the attendant should wear self-contained breathing apparatus, impermeable gloves, boots and coveralls.
- A standby attendant should always be present and continuous communication should be provided.
- Follow standard safety procedures for entry of confined spaces.
- Prevent skin contact with sludge.
- Collect, drain and store contaminated material in sealed drums pending disposal (Tables 11and 23).
- The attendant should shower immediately after cleaning retorts or tanks.

Recommendations

Test safety devices (e.g. interlocks, backflow preventers, monitoring equipment) at regular intervals (as specified by the manufacturer) … and as specified in each preservative’s chapters (table 22).
Test alarms as specified in each preservative’s chapters (table 22).
Ensure all spill catchments materials and protective PPE are in sound condition and fully equipped accordingly to the specification of the emergency plan.
A spill kit accompanied with appropriate PPE should be stored in a centralized area that is within ready access to the unloading pad, tank farm, treating cylinder and waste storage area.

Objective

Ensure orderly shutdown prior to long-term closure.

Recommendations

Thoroughly clean all equipment that has been in contact with preservatives.
Collect all solvents and washwaters generated by cleanup operations (Tables 11 and 23).
Hold solutions in closed tanks for prolonged shutdown:
- Drain all open tanks or sumps to closed storage tanks.
- Ensure that temperatures in storage areas are above freezing levels or provide adequate freezing protection for all stored liquids.
In case of permanent shutdown, arrange for reuse of solutions at another facility if possible or dispose as a hazardous waste.

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Wood preservation facilities, general recommendations: chapter A, table 22

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

Equipment maintenance

Cleanout

Alarms and Safety Devices

Long-term shutdown

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