API Standards – Request Official Documents Online 2026

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API TR 18TR4

Evaluation of Welding Requirements as Applicable to API Product Specifications

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API TR 1PER15K-1

Protocol for Verification and Validation of High-Pressure High-Temperature Equipment

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API TR 21TR1

Materials Selection for Bolting

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API TR 21TR2

S-N Fatigue Design Guidelines and Test Data for Low-Alloy Steel Bolts

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API TR 2568

Evaporative Loss from the Cleaning of Storage Tanks

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API TR 2569

Evaporative Loss from Closed-Vent Internal Floating-Roof Storage Tanks

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API TR 2570

Continuous On-Line Measurement of Water Content in Petroleum (Crude Oil and Condensate)

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API TR 2571

Fuel Gas Measurement

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API TR 2572

Carbon Content, Sampling, and Calculation

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API TR 2573

Standard Guide for Sediment and Water Determination in Crude Oil

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API TR 2574

Field Testing Protocol for Characterization of Total Gaseous Nonmethane Organics (TGNMO), Methane, and Ethane in Air-Vapor Mixture During Filling of a Cargo Vessel with Crude Oil

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API TR 2575

Measurement of Thermally Cracked Gas

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