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A collection of featured documents from our library that are popular among our users or otherwise noteworthy.

API Std 650 14th edition

Welded Tanks for Oil Storage

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API Std 608 7th edition

Metal Ball Valves—Flanged, Threaded, and Welding Ends

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API RP 552 2nd edition

Transmission Systems

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API Spec 5L 47th Edition

Line Pipe

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API Std 653 5th edition

Tank Inspection, Repair, Alteration, and Reconstruction

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API RP 500 4th edition

Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1, and Division 2 4th 2023 C50004 $302.00 108 Rp 505 Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone 1, and Zone 2

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API Std 1104 22nd edition

Welding of Pipelines and Related Facilities, Includes Errata 1 (2023) and Addendum 1 (2026)

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API RP 5C1 18th edition

Recommended Practice for Care and Use of Casing and Tubing

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API Spec 6A 21st edition

Specification for Wellhead and Tree Equipment

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API Std 53 (R2023) 5th edition

Well Control Equipment Systems for Drilling Wells

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All Documents

API Publ 4776
A Guide to Understanding, Assessment and the Regulation of PAHs in the Aquatic Environment
API Publ 4776

A Guide to Understanding, Assessment and the Regulation of PAHs in the Aquatic Environment

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API Publ 4782
Petroleum Refining Industry Contribution to Nationwide Surface Water Nutrient Loadings
API Publ 4782

Petroleum Refining Industry Contribution to Nationwide Surface Water Nutrient Loadings

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API Publ 4783
Water Management and Stewardship in Midstream, Downstream, and Delivery Operations in the Oil and Gas Industry
API Publ 4783

Water Management and Stewardship in Midstream, Downstream, and Delivery Operations in the Oil and Gas Industry

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API Publ 4784 1st edition
Quantification of Vapor Phase-Related Natural Source Zone Depletion Processes
API Publ 4784 1st edition

Quantification of Vapor Phase-Related Natural Source Zone Depletion Processes

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API Spec 4F 5th edition
Specification for Drilling and Well Servicing Structures
API Spec 4F 5th edition

Specification for Drilling and Well Servicing Structures

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API RP 4G 5th edition (R2026) PDF Preview
API RP 4G 5th edition (R2026)

Operation, Inspection, Maintenance, and Repair of Drilling and Well Servicing Structures

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API RP 51 3rd edition
Onshore Oil and Gas Production Practices for Protection of the Environment
API RP 51 3rd edition

Onshore Oil and Gas Production Practices for Protection of the Environment

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API TR 522 1st edition
Technical Report on Pressure-Relief System Calculations
API TR 522 1st edition

Technical Report on Pressure-Relief System Calculations

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API Std 526 8th edition
Flanged Steel Pressure-Relief Valves
API Std 526 8th edition

Flanged Steel Pressure-Relief Valves

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API Std 527 5th edition PDF Preview
API Std 527 5th edition

Seat Tightness of Pressure Relief Valves

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API RP 534 2nd edition
Heat Recovery Steam Generators
API RP 534 2nd edition

Heat Recovery Steam Generators

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API RP 535 3rd edition
Burners for Fired Heaters in General Refinery Services
API RP 535 3rd edition

Burners for Fired Heaters in General Refinery Services

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API Std 536 3rd edition
Post-Combustion NOx Control for Equipment in General Refinery and Petrochemical Services
API Std 536 3rd edition

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

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API Std 537 3rd edition
Flare Details for Petroleum, Petrochemical, and Natural Gas Industries
API Std 537 3rd edition

Flare Details for Petroleum, Petrochemical, and Natural Gas Industries

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API RP 538 1st edition
Industrial Fired Boilers for General Refinery and Petrochemical Service
API RP 538 1st edition

Industrial Fired Boilers for General Refinery and Petrochemical Service

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API RP 54 4th edition
Occupational Safety and Health for Oil and Gas Well Drilling and Servicing Operation
API RP 54 4th edition

Occupational Safety and Health for Oil and Gas Well Drilling and Servicing Operation

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API Std 541 5th edition
Form-Wound Squirrel Cage Induction Motors--”375 kW (500 Horsepower) and Larger
API Std 541 5th edition

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

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API Std 546 4th edition
Brushless Synchronous Machines—500 kVA and Larger
API Std 546 4th edition

Brushless Synchronous Machines—500 kVA and Larger

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API Std 547 2nd edition
General Purpose Form-Wound Squirrel Cage Induction Motors—185 kW (250 hp) Through 2240 kW (3000 hp)
API Std 547 2nd edition

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

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API RP 551 2nd edition
Process Measurement Instrumentation
API RP 551 2nd edition

Process Measurement Instrumentation

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API RP 553 2nd edition
Refinery Valves and Accessories for Control and Safety Instrumented Systems
API RP 553 2nd edition

Refinery Valves and Accessories for Control and Safety Instrumented Systems

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API RP 554, Part 1 3rd edition
Process Control Systems, Part 1—Process Control Systems Functions and Functional Specification Development
API RP 554, Part 1 3rd edition

Process Control Systems, Part 1—Process Control Systems Functions and Functional Specification Development

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API RP 554, Part 2 2nd edition
Process Control Systems, Part 2—Process Control System Design
API RP 554, Part 2 2nd edition

Process Control Systems, Part 2—Process Control System Design

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API RP 554, Part 3 2nd edition
Process Control Systems, Part 3—Project Execution and Process Control System Ownership
API RP 554, Part 3 2nd edition

Process Control Systems, Part 3—Project Execution and Process Control System Ownership

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API RP 556 2nd edition
Instrumentation, Control, and Protective Systems for Gas Fired Heaters
API RP 556 2nd edition

Instrumentation, Control, and Protective Systems for Gas Fired Heaters

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