WAZIPOINT Engineering Science & Technology: Safety of DuPont Suva Refrigerants

Sunday, December 6, 2020

Safety of DuPont Suva Refrigerants

DuPont Answers Your Questions about the Safe Handling and Use of DuPont Suva Refrigerants

DuPont Suva refrigerants, which are composed of hydrochlorofluorocarbon (HCFC) and hydrofluorocarbon (HFC) compounds, were developed as safe, effective alternatives to existing chlorofluorocarbon (CFC) refrigerants.

Mechanical Equipment Room Requirements

• Install an air monitor capable of detecting the refrigerant(s) used in concentrations up to the EEL or STEL.

• Install suitable alarms that activate at or below the refrigerant’s AEL, and that will alert persons outside of the equipment room that a leak condition exists.

• Route relief valve discharge headers and purge units outdoors, away from all air intakes to building.

• Install local exhaust to ventilate the work area in the event that the air monitor alarm point is exceeded.

• Follow minimum standards for refrigerants as required and specified by ASHRAE Standard 15–1994 (or the most recent revision). Refer to DuPont technical bulletin AS-5 for more detailed guidelines for using HCFC-123 in refrigeration and air-conditioning applications.

General Precautions for Handling Suva Refrigerants

• Never pressurize systems or vessels containing Suva refrigerants with air for leak testing or any other purpose.

• Never heat cylinders above 52°C (125°F). Do not place cylinders near flames or heat sources, or discard into fires.

• Never use torches or open flames to heat cylinders during refrigerant charging operations.

• Never tamper with valves or pressure relief devices.

• Never refill disposable cylinders with anything. Any refrigerant heels should be used or transferred to recovery containers, and the empty cylinder should be properly disposed of.

• Never refill disposable or returnable cylinders with reclaimed refrigerants or lubricants. Use only proper recovery cylinders for this purpose. It is illegal to ship original cylinders with used refrigerants.

• Never use disposable refrigerant cylinders as compressed air tanks. Refrigerant cylinders are not coated properly on the inside, and moisture from compressed air will cause corrosion. This can weaken the cylinder and cause a violent rupture. There may be NO evidence of cylinder weakening until it fails.

• Always store refrigerant cylinders in a dry area. Storage in damp areas may permit corrosion, which will weaken the cylinders over time. Also do not store in direct sunlight where cylinder temperatures can exceed 52°C (125°F).

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