API Spec 20C

Specifies requirements and gives recommendations for the design, qualification, and production of closed-die forgings for use in API service components in the petroleum and natural gas industries when referenced by an applicable equipment standard or otherwise specified as a requirement for compliance.API 20C is applicable to equipment used in the oil and natural gas industries where service conditions warrant the use of closed-die forgings. Examples include pressure containing or load-bearing components.This standard establishes requirements for four forging specification levels (FSL). These FSL designations define different levels of forged product technical, quality and qualification requirements.