It introduces API 5L, API 5B, API 5CT and API 5D
API standards are designed to qualify the oil and petrol industry according to the legislation and environment requirements. According to API, oil and natural gas industry can have the reference standards about its industry. Under the general standards, there are some subordinated specifications drafted for each specific OCTG product, such as API 5B, API 5CT, API 5D, API 5L and so on. API 5L covers seamless and welded steel line pipe . It provide specification for pipe used in conveying gas, water, and oil in both the oil and natural gas industries. It includes standard-weight and extra-strong threaded line pipe; and standard-weight plain-end, regular-weight plain-end, special plain-end, extra-strong plain-end, special plain-end, extra-strong plain-end pipe; as as well as bell and spigot and through-the-flow line(TFL) pipe. Grades covered by API 5L are A25, A, B (and the following "X" Grades), X42, X46, X52, X56, X60, X65, X70, X80. The two digit number following th...