API MPMS 6.1A:2021 is part of a set of documents that detail the minimum requirements for metering systems in single phase liquid applications; API MPMS Chapter 6.1A is common to all sections of API MPMS Chapter 6 and specifes the common requirements for system criteria.
In the event of a confict between this and API MPMS Chapter 6 sections that are not in the 6.XA series, API MPMS Chapter 6.1A shall take precedence.
