valve. (It was discussed that it is a rare occasion that would require releasing the ammonia and no one in attendance had ever done so.)

• Carry out emergency preparedness training with staff and first responders.

Several attendees mentioned that it is all too common to

discover missing tools even when painted space peg boards are provided to keep them readily available. Pipe wrenches, adjustable wrenches and valve wrenches must be left in place to be accessible during emergency situations.

GOVERNMENT AGENCIES

Tere was discussion regarding code and code interpretation discrepancies between WorkSafe British Columbia and Technical Safety British Columbia.

It was mentioned that similar issues arise outside of British

Columbia, and it would be beneficial to have all parties working toward a common goal to minimize confusion and frustration.

Tere have been occasions when first responders have taken

charge over ammonia leak situations that could have been better handled by the on-site refrigeration contractor. It was suggested that refrigeration contractors and first responders develop a closer working relationship and undergo further training to gain critical knowledge and experience.

SUMMARY

Facilities should adhere to the following steps to improve ammonia refrigeration safety: • Test safety controls on a regular basis. • Test life-safety systems on a consistent schedule.

• Recognize the significance of all ammonia levels on your alarm device.

• Drain the chiller oil pot only after evaporating out all liquid ammonia.

• Install check valves on compressor oil charge valves. • Carry bite blocks at all times while in the plant room. • Wear an ammonia mask while servicing. • Know how to isolate all system components. • Consider higher ventilation rates. • Obtain a high-volume emergency fan with 50' of flex duct. • Install a dedicated water hose outside mechanical room. • Install all welded fittings and valves. • Install leak-activated isolation valves. • Install pH sensors on chillers and condensers.

• Reduce the ammonia charge through low-charge heat exchangers.

• Contemplate installing the system outdoors. • Conduct regular in-house refrigeration training. • Coordinate annual training with first responders.

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• Prepare a written evacuation procedure and practice it.

• Require staff and management to sign off on emergency procedures.

• Train for emergency situations. • Know when to evacuate the facility and call for help.

GENERAL REFRIGERATION SAFETY TIPS

It is critical for all facilities to have: •

• An enclosed refrigeration plant room

Sensors to detect dangerous gas levels (ammonia, Freon, CO2, NO2)

• Proper leak detection and ventilation • An emergency and evacuation plan

• Regular refrigeration safety training for operators •

•

An annual inspection at minimum by trained refrigeration contractor

A strong relationship with first responders, who are trained on the arena’s refrigeration system and layout

Art Sutherland is the founder and president of Accent Refrigeration Systems, which specializes in the design, manufacturing and installation of high-efficiency mechanical systems for the ice rink industry.

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