Environmental Code of Practice for Elimination of Fluorocarbon Emissions

Started by Admin, June 24, 2007, 12:39:42 PM

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QuoteNitrogen Welding Blanket. Before welding or brazing pipe joints, dry nitrogen should be allowed to bleed continuously through the system to eliminate oxidation. All mechanical joints should be visually inspected and double checked for tightness before a nitrogen pressure test is performed.

QuotePressure Testing of Hoses and Equipment. Hoses and gauges should be pressure tested to prevent refrigerant emissions to the atmosphere. Dry nitrogen should be used to pressure test the hoses and gauge manifold for leaks at regular intervals before they are attached to a system.

Quote3.4.3 Leak Testing and Repair

The following procedures are recommended and approved before repairing leaks and replacing components in systems.

· Verification that the unit is genuinely short of charge, before opening the closed loop.

· The system should be thoroughly leak checked before and after servicing, using the best available technology, e.g., an electronic leak detector, capable of detecting leakage rates of less than 14 g (0.5 oz) per year. If a leak is found, the unit should be evacuated and repaired.
· Leak testing using ODS and releasing them to the atmosphere is an unacceptable practice and is illegal in most provinces.

· In the case of an non-repairable leak, the refrigerant should be recovered and the owner should dispose of the equipment in accordance with the appropriate Municipal By-laws or provincial regulations. All refrigerant and oil should be recovered.

NOTE: Charging cylinders are tools and not approved storage vessels and cannot be used to store or transport refrigerant.

If there is a repairable leak, the following procedures are recommended:

· The service person will attach an access entry valve if necessary, and evacuate the system.

NOTE: Do not use ODS for the leak test.

· A permanent access entry valve is brazed onto the refrigeration system before the closed loop is punctured. This should be done in accordance with CEASA procedures.

· Small systems will then be sweep charged using the appropriate CEASA procedure.

· After a leak testing and repair, the sweep charge is recovered.

· The unit is recharged to the proper operating level.

The following alternate methods are recommended for larger equipments:

1. Standing Vacuum test 75 um for 15 minutes. The system is then repaired and recharged.
2. Standing pressure test at 1034 kPag (150 psig) of dry nitrogen for 24 hours. The system is then repaired and recharged.

The unit should be isolated to contain the refrigerant or have the refrigerant recovered until the service is completed when repairing leaks and replacing components on residential systems. Leak repair of a residential split system, usually entails removing a maximum of four to five pounds of refrigerant which should be recovered for reuse. Epoxy should not be used to repair leaks, as it may fail or loosen after several months service. Brazing or welding is preferred.


Quote2.7.4 Service Records

An up-to-date service record should be kept close to the equipment or with the owner and should
be made available for inspection by the proper authorities. This should include details on leak
testing and quantities charged or recovered.