- API RP 15CLT - Recommended Practice for Composite Lined Steel Tubular Goods
- API Spec 15HR - Specification for High Pressure Fiberglass Line Pipe
- API Spec 15LE - Specification for Polyethylene (PE) Line Pipe
- API Spec 15LR - Specification for Low Pressure Fiberglass Line Pipe
- API RP 15TL4 - Recommended Practice for Care and Use of Fiberglass Tubulars
- API RP 15S - Recommended Practice for Qualification of Spoolable Reinforced Plastic Line Pipe