Leak checking, containment and record keeping
Frequency is set by CO2 equivalent
Periodic leak checks apply to equipment containing 5 tCO2e or more, and the interval shortens as the charge grows:
| Charge | No leak detection system | With fixed leak detection system |
|---|---|---|
| 5 to <50 tCO2e | every 12 months | every 24 months |
| 50 to <500 tCO2e | every 6 months | every 12 months |
| 500 tCO2e or more | every 3 months | every 6 months |
Hermetically sealed equipment containing less than 10 tCO2e is exempt from periodic checks (but not from record keeping or competent handling). Where a fixed leak detection system is claimed, it must be tested at least annually and alarmed.
When a leak is found it must be repaired without undue delay, a follow-up check must verify the repair within one month, and leaks of 5 tCO2e or more must be recorded.
Records
Keep: the quantity and type of gas charged and recovered, the GWP and tCO2e, dates and results of leak checks, the identity of the certified person or company, and details of repairs. Retain for at least five years. Records accompany the equipment if ownership changes.
Traps
- Using kg instead of tCO2e to select the interval.
- Halving the interval upwards in the wrong direction - a detection system lengthens, never shortens, the interval.
- Assuming a hermetically sealed unit never needs records.
Worked example
A rack contains 40 kg R-404A. tCO2e = 40 × 3922 ÷ 1000 = 156.9 tCO2e. That falls in the 50–500 band: every 6 months, or every 12 months if a certified fixed leak detection system is fitted.