CFR›Title 30›Chapter I›Part 27›Subpart B ContainsSections 27.20–27.24CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart B—Construction and Design Requirements Sections 27.20 § 27.20 Quality of material, workmanship, and design. 27.21 § 27.21 Methane-monitoring system. 27.22 § 27.22 Methane detector component. 27.23 § 27.23 Automatic warning device. 27.24 § 27.24 Power-shutoff component. Previous A Subpart A—General Provisions Next C Subpart C—Test Requirements