Valve Standard Reference
API 17D
AmericanDesign and Operation of Subsea Production Systems - Subsea Wellhead and Tree Equipment
API 17D is the governing specification for subsea wellhead equipment and Christmas trees, covering the design, manufacture, testing, and operation of all pressure-containing and pressure-controlling components installed on the seabed at water depths up to 3,000 metres.
What is API 17D?
API 17D (Design and Operation of Subsea Production Systems - Subsea Wellhead and Tree Equipment) is an industrial valve standard issued by American Petroleum Institute (API). Covers subsea wellheads, subsea Christmas trees (vertical and horizontal tree configurations), casing hangers, tubing hangers, tree running tools, and all associated subsea valves including gate valves, ball valves, and choke valves installed on the seabed.
- Issuing Body:
- American Petroleum Institute (API)
- Category:
- design
Overview - API 17D
API 17D is the governing specification for subsea wellhead equipment and Christmas trees, covering the design, manufacture, testing, and operation of all pressure-containing and pressure-controlling components installed on the seabed at water depths up to 3,000 metres. Subsea Christmas trees are among the most safety-critical valve assemblies in the oil and gas industry - they must reliably isolate wellbore pressures up to 15,000 psi at depths where maintenance requires remotely-operated vehicles (ROVs). API 17D is jointly published with ISO 13628-4 and is mandatory for all major deepwater field developments including those operated by Shell, BP, TotalEnergies, Equinor, and Petrobras.
Scope
Covers subsea wellheads, subsea Christmas trees (vertical and horizontal tree configurations), casing hangers, tubing hangers, tree running tools, and all associated subsea valves including gate valves, ball valves, and choke valves installed on the seabed. Working pressure ratings from 3,000 psi to 15,000 psi. Temperature service class from −18°C (T) to 121°C (V). Water depth ratings from 0 to 3,000 m.
Vajra Industrial Solutions manufactures and supplies valves engineered to comply with API 17D, each delivered with API 17D / ISO 13628-4 compliance certificate and PSL 3 or 4 qualification documentation package as standard.
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Applicable Valve Types
Subsea Gate Valves - production master and wing valves on tree
Subsea Ball Valves - crown valve and swab valve
Subsea Choke Valves - flow control on production tree
Applicable Pressure Classes
Key Requirements - API 17D
Product Specification Level (PSL) 3 or 4 mandatory for all subsea wellhead and tree components
Working pressure ratings: 3000, 5000, 10000, and 15000 psi (aligned with API 6A classes)
Material class for sour service: CC, DD, EE, FF, or HH per NACE MR0175 / ISO 15156
All valves must function reliably after extended periods of inactivity on the seabed (minimum qualification cycle per PSL)
ROV override facility: all subsea valves must be operable by remotely operated vehicle without diver intervention
Subsurface safety valve (SSSV) integration: tree must accept downhole safety valve control umbilical
Diverless connection system: all hub connectors and running tools compatible with ROV-deployed tools
Seawater-resistant materials: 25Cr duplex or super-duplex stainless, Inconel 625-clad bores for subsea wetted parts
Testing Requirements - API 17D
Factory acceptance test (FAT): full hydrostatic test at 1.5× rated working pressure
Seat test at rated working pressure from both upstream and downstream
Low-pressure gas test at 50–100 psi for seat integrity check
Full functional cycling under rated pressure (minimum cycle count per PSL level)
System integration test (SIT): assembled tree tested with running tools and ROV override
Documentation Required for API 17D Compliance
API 17D / ISO 13628-4 compliance certificate
PSL 3 or 4 qualification documentation package
Full material traceability records (EN 10204 3.1 or 3.2 MTRs)
Third-party inspection certificate from API-qualified inspection body
Factory acceptance test report with witnessed pressure curves
NACE MR0175 / ISO 15156 compliance certificate for sour service components
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