- API Spec 12B - Specification for Bolted Tanks for Storage of Production Liquids
- API Spec 12D - Specification for Field Welded Tanks for Storage of Production Liquids
- API Spec 12F - Specification for Shop Welded Tanks for Storage of Production Liquids
- API Spec 12GDU - Specification for Glycol-Type Gas Dehydration Units
- API Spec 12J - Specification for Oil and Gas Separators
- API Spec 12K - Specification for Indirect-type Oil Field Heaters
- API Spec 12L - Specification for Vertical and Horizontal Emulsion Treaters
- API RP 12N - Recommended Practice for Operations, Maintenance and Testing of Firebox Flame Arrestors
- API Spec 12P - Specification for Fiberglass Reinforced Plastic Tanks
- API RP 12R1 - Recommended Practice for Setting, Maintenance, Inspection, Operation, and Repair of Tanks in Production Service
