Table 3.
Summary PC emission assessment surveys with focus on malfunctions
| Site | HHP Detects | OGI Detects | Malf. PCs | Malf. PCs | Malf. PC1 Emission rate(s) |
|---|---|---|---|---|---|
| (N, %) | (N, %) | (N, %) | Identity | (scf/h) | |
| Oil 1 | 0, 0 | 0, 0 | 0, 0 | N/A | N/A |
| Oil 2 | 4, 28 | 1, 7 | 1, 7 | WellMark 7400 (actuator) | 0.7 |
| Oil 3 | 2, 20 | 2, 20 | 2, 20 | Kimray T12 (2) | 1.4, 3.4 |
| Oil 4 | 1, 8 | 0, 0 | 0, 0 | N/A | N/A |
| Oil 5 | 6, 55 | 3, 27 | 3, 27 | Kimray T12, WellMark 7400, WellMark 7400 (actuator) | 3.1*^, 0.3, 1.2 |
| Gas 1 | 1, 17 | 1, 17 | 0, 0 | N/A | N/A |
| Gas 2 | 4, 57 | 4, 57 | 2, 29 | Kimray T12, WellMark 6900 | 0.4, 1.6* |
| Gas 3 | 5, 100 | 3, 60 | 3, 60 | Kimray T12, WellMark 6900 (2) | 0.3, 4.5*, 0.6 |
1
Defined as malfunctioning (malf.) if continuous emissions > 0.2 scf/h for IPCs or > 6 scf/hr for CPCs [assumes a low bleed category for continuous PCs (9)]. All measurements were HVS, except
(*)
by Alicat MFMs. Emission rates are whole gas at standard conditions with gas stream composition correction factors applied.
(^)
Multiple PC systems with hidden tubing, location of emission not identified, 3.1 scf/h arbitrarily assigned to Kimray T12.