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. Author manuscript; available in PMC: 2018 Oct 10.
Published in final edited form as: J Environ Prot (Irvine, Calif). 2017 Apr;8(4):394–415. doi: 10.4236/jep.2017.84029

Table 2.

PC type summary by site with intermittent vent (IPCs) accounting for 96% of the total.

Site PCs IPCs PCs per Well Three Most Common PC Types by Site
(N) (N) (N) Manufacturer, Model Family, (N)
Oil 1 15 15 15 WellMark 7400 (7), Kimray T12 (4), Kimray BP (3)
Oil 2 14 14 7 Kimray T12 (5), Wellmark 7400 (4), Kimray BP (2)
Oil 3 10 10 10 WellMark 7400 (5), Kimray T12 (4), Kimray BP (1)
Oil 4 12 12 12 WellMark 7400 (6), Kimray T12 (5), Kimray BP (1)
Oil 5 11 11 11 WellMark 7400 (6), Kimray T12 (3), Kimray BP (1)
Gas 1 6 5 1.3 WellMark 6900 (3), Kimray T12 (2), Fisher 4460 (1)
Gas 2 7 6 2.3 Kimray T12 (3), WellMark 6900 (2), Fisher 4460 (1)
Gas 3 5 4 1.0 WellMark 6900 (2), Kimray T12 (2), Fisher 4460 (1)