The new API 5B Specification (16th Edition) has already been published in December, 2017. The effective date of this edition is July 1, 2018. The 16th Edition has made some major changes. Now we have compiled these changes into a single document.
Based on the findings from oilfields and oil equipments manufacturers’ use of working gauges and periodic recalibrations, due to improper management, use & care by some companies, the gauges will lose their accuracy and are no longer fit for gauging.