API Spec 12F-2024 PDF

Full title and description

St API Spec 12F-2024 — Specification for Shop-welded Tanks for Storage of Production Liquids. Defines requirements for new shop-fabricated, vertical, cylindrical, aboveground, welded steel storage tanks in standard sizes and capacities used in petroleum production service.

Abstract

This specification establishes material, design, fabrication, testing, inspection, marking and allowable internal pressure requirements for shop-welded tanks intended for storage of crude petroleum and other production liquids. It is intended to provide purchasers and manufacturers with a consistent set of requirements for safe, economical tanks used in production operations.

General information

• Status: Current.
• Publication date: October 2024 (published 31 October 2024; API Monogram program effective date noted April 30, 2025).
• Publisher: American Petroleum Institute (API).
• ICS / categories: 23.020.10 (Stationary containers and tanks); petroleum & related technologies (75 series).
• Edition / version: 14th edition (October 2024).
• Number of pages: 37 pages.

Scope

Applies to new shop-fabricated, vertical, cylindrical, aboveground, welded steel storage tanks manufactured in standard sizes and capacities for use in production service. The specification covers requirements for materials (plates, welding consumables, structural shapes), design (shells, bottoms, decks), venting, allowable internal pressures (see Table 1 of the specification), fabrication, welding procedures, testing, external and internal coatings/coatings guidance, marking, and purchaser/inspection responsibilities. Tanks built to other dimensions than those in the referenced tables are outside the scope.

Key topics and requirements

• Material specifications for plates, sheets, welding electrodes and fasteners.
• Design rules for shell and bottom thickness, joint types, deck and shell attachments.
• Welding procedure qualifications, weld quality, and fabrication tolerances.
• Venting (normal and emergency) and allowable internal pressure limits (Table 1).
• Factory acceptance testing: hydrostatic/air testing, nondestructive examination, dimensional checks.
• Inspection, marking, and documentation requirements; purchaser inspection rights.
• API Monogram program provisions and effective date for monogram licensing.

Typical use and users

Primary users include oil and gas production companies (tank purchasers), tank manufacturers/fabricators, welding and inspection contractors, engineering firms performing tank design and procurement, and regulatory or inspection bodies overseeing storage of production liquids. The standard is used to specify shop-fabricated tanks for production sites, terminals, and other facilities handling crude and related liquids.

Related standards

Commonly referenced and related API publications and practices include: API Spec 12D (field-welded tanks), API Spec 12B (bolted tanks), API Std 650 (welded steel tanks for oil storage), API Std 2000 (venting of atmospheric and low-pressure storage tanks), and inspection/maintenance RPs such as API RP 575. Users should consult these standards and local regulations where applicable.

Keywords

shop-welded tanks, storage tanks, production liquids, API 12F, tank design, tank fabrication, welding, tank testing, venting, API Monogram

FAQ

Q: What is this standard?

A: API Spec 12F:2024 is the fourteenth-edition specification that sets requirements for shop-fabricated, vertical, cylindrical, aboveground welded steel tanks used to store production liquids in the oil and gas industry.

Q: What does it cover?

A: It covers materials, design calculations and limits, fabrication and welding requirements, venting and allowable internal pressures, testing and inspection, marking, and purchaser/manufacturer responsibilities for standard-size shop-welded tanks.

Q: Who typically uses it?

A: Tank fabricators, purchasers in oil and gas production, plant/terminal engineers, welding and inspection contractors, and authorities having jurisdiction when API references are adopted.

Q: Is it current or superseded?

A: Current — the 2024 edition supersedes API Spec 12F:2019; users should adopt the 2024 requirements for new tank procurements. API Monogram licensing notes an effective date for the updated Monogram provisions in 2025.

Q: Is it part of a series?

A: Yes — it is part of API’s 12-series specifications addressing storage tanks (for example 12B, 12D, 12F, 12P) and complements other API tank and storage standards.

Q: What are the key keywords?

A: shop-welded tanks, storage of production liquids, API 12F, tank fabrication, venting, hydrostatic testing, welding qualification, API Monogram.