API Standards – Request Official Documents Online 2026

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API Std 520, Part II

Sizing, Selection, and Installation of Pressure-Relieving Devices—Part II—Installation

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API Std 521

Pressure-Relieving and Depressuring Systems

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API Std 526

Flanged Steel Pressure-Relief Valves

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API Std 527

Seat Tightness of Pressure Relief Valves

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API Std 53

Well Control Equipment Systems for Drilling Wells

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API Std 530

Calculation of Heater-Tube Thickness in Petroleum Refineries

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API Std 536

Post-Combustion NOx Control for Equipment in General Refinery and Petrochemical Services

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API Std 537

Flare Details for Petroleum, Petrochemical, and Natural Gas Industries—Russian

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API Std 541

Form-Wound Squirrel Cage Induction Motors—375 kW (500 Horsepower) and Larger—Russian

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API Std 546

Brushless Synchronous Machines—500 kVA and Larger

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API Std 547

General Purpose Form-Wound Squirrel Cage Induction Motors—185 kW (250 hp) Through 2240 kW (3000 hp)

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API Std 560

Fired Heaters for General Refinery Service

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