API 570, Piping Inspection Code, is an inspection code developed by the American Petroleum Institute (API) that covers the in-service inspection, repair, alteration, and rerating activities for piping systems and their associated pressure relieving devices in the petroleum and chemical process industries. It specifically applies to metallic piping and those plastic ones that are either fiberglass reinforced (FRP) or glass reinforced (GRP). The first edition of the code was originally published in October of 1998 and the most recent release was the third edition, which was published in November of 2009.

API 570 establishes requirements and guidelines that allow owners or users of piping systems to maintain the safety and mechanical integrity of their systems after they have been placed into service. While it was primarily intended for those systems in the petroleum and chemical process industries, this code can be applied to any piping system where practical.

This code also covers pipelines that carry process fluids, hydrocarbons, and other flammable or toxic fluids. Some specific fluids covered include: petroleum and chemical products, natural gas, flare systems, sour water, high pressure gasses and several others. This standard specifically does not govern the construction of pipelines or set forth any standards relating to them before they are placed into service. In the event of any conflicting standards of regulations, API 570 should take precedence in cases where it is the more stringent requirement.

The application of this inspection code is restricted to owner/users that employ or have access to the following technically qualified individuals and organizations:

a. An authorized inspection agency
b. A repair organization
c. An engineer
d. An inspector.
e. Examiners.