API Standard 682, titled “Pumps – Shaft Sealing Systems for Centrifugal and Rotary Pumps,” is the American Petroleum Institute (API) standard for end-face mechanical seals. The purpose of API 682 is to assist in the selection and operation of end face mechanical seals in centrifugal pumps. It is based on the combined knowledge and experience of seal manufacturers, engineering companies, and end users. API 682 is primarily intended for use in the petroleum, natural gas and chemical industries, but is often referenced for other types of equipment and industries. The API has approximately 500 technical standards for processes and components.