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Wood preservation facilities, general recommendations: chapter A, table 12

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Table 12. Recommended Design Features for Chemical Mixing Systems (All Preservatives)

Objectives:

Provide a mixing system with effective spill prevention features.
Provide a mixing system that minimizes worker contact with base ingredients, additives and concentrates.

Design feature	Recommendations
National Fire Code of Canada 2010	Refers to acceptable solutions for Indoor and Outdoor Storage: Division B, Part 3 Flammable and Combustible Liquids: Division B, Part 4
Configuration	Use permanent, closed systems (rigidly piped, tank to tank).
Location / shelter	Locate in a contained area. Provide protection against freezing (as applicable).
Spill prevention	Install high-level alarms to prevent work tank overflow. Interlock high-level alarms to tank feed pumps. Consider installation of 24-hour monitoring alarms (with remote) for immediate detection of major spills (at containment).
Spill containment	Provide all applicable features for spill containment of bulk liquids described in Table 11.
Drip containment	Provide local drip collection at all potential drip points.
Splash protection	No open transfer of treating solutions or additives is allowed.
Ventilation	Provide adequate ventilation in the mixing area for routine operations and emergency situations Work tank should be vented outside the workplace. Encourage to vent the work tank into a dedicated overflow tank, vented outside, to prevent releases of entrained liquids or overflow.
Tanks / Mixing vessels	Encourage the use of mechanized transfer equipment to minimize worker exposure.
Emergency response	Provide accessible storage for spill-response equipment, absorbent and personal protection equipment. Provide appropriate measures for fire detection and suppression, as well as for rapid, effective fire control with containment of liquid firefighting residues and treatment to required limits before discharge. Provide appropriate signalization of fire control equipment. Install a telephone or other voice communication system and manual alarm switch Provide features described in “Environmental Emergency Notification and Contingency Planning” Section 12.

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2017-09-10

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