The purpose of this specification is to provide standards for pipe suitable for use in conveying gas, water, and oil in both the oil and natural gas industries.

The API 5l specification establishes requirements for two product specification levels (PSL1 and PSL2). These two PSL designations define different levels of standard technical requirements. PSL 2 has mandatory requirements for carbon equivalent, notch toughness, maximum yield strength and maximum tensile strength. The PSL designation has to be defined by the customer at the time of order placement.

Mills are licensed to apply the API Monogram to products complying with the API 5L Specification.

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