API Spec 17D – Subsea Wellhead & Christmas Tree Equipment Gap Analysis
Systematically assess your manufacturing compliance against API Specification 17D for subsea wellhead systems, vertical and horizontal subsea trees, tubing hangers, subsea control systems, and subsea connectors and hubs for offshore deepwater oil and gas production.
Executive summary and section-by-section compliance overview for API Spec 17D Subsea Wellhead and Tree Equipment.
COMPANY —
ASSESSED BY —
DATE —
PSL —
RWP —
WATER DEPTH —
TEMP CLASS —
EQUIPMENT —
SCOPE —
📊 Section-by-Section Compliance Rate
🔴 Identified Gaps & Actions Required
ISO Xpert – Your API Spec 17D Subsea Partner
Expert API consultancy for subsea wellhead and tree equipment manufacturers — supporting PSL-1 through PSL-3 compliance, deepwater and HPHT applications. Headquartered in London, serving subsea equipment manufacturers globally.
ISO Xpert is a leading API and ISO management system consultancy headquartered in London, UK. We support subsea wellhead and tree equipment manufacturers through the complete API Spec 17D monogram licensing journey — from initial gap analysis and QMS documentation aligned to API Q1, through subsea design review, qualification testing programme development, FAT and SIT procedure preparation, ROV interface verification, cathodic protection qualification, and final API audit preparation.
Our consultants understand the unique challenges of subsea equipment manufacturing including external hydrostatic pressure design, CRA cladding qualification, elastomer and metal seal qualification for deepwater service, thermal insulation qualification, chemical injection compatibility, and the demanding reliability and traceability requirements for PSL-3 deepwater and HPHT subsea systems where equipment retrieval and maintenance is extremely costly.
Our specialist team guides subsea wellhead and tree manufacturers through PSL-1 to PSL-3 compliance and full API monogram licensing. Contact us for a free consultation.
ISO Xpert Ltd is committed to protecting your privacy. This policy explains how we collect, use, and safeguard your information when you use our API Spec 17D Gap Analysis Tool and visit iso-xpert.com.
1. Information We Collect
Assessment Data: Company name, assessor details, equipment type, PSL level, pressure rating, water depth, temperature class, bore size, licence number, scope, and gap analysis responses entered into the tool.
Contact Information: Name, email, phone, and company details when you contact us.
Usage Data: Browser type, device information, and IP address.
2. Data Storage
All assessment data is stored locally in your browser (localStorage) and is not transmitted to ISO Xpert servers unless you explicitly share it with us.
3. Your Rights (UK GDPR)
You have the right to access, correct, delete, or restrict processing of your personal data. Contact info@iso-xpert.com.
4. Contact
ISO Xpert Ltd | 71-75 Shelton Street, Covent Garden, London WC2H 9JQ, UK | info@iso-xpert.com | +44 7853 109840
Terms of Use
Last Updated: April 2025 | ISO Xpert Ltd
These Terms govern your use of the ISO Xpert API Spec 17D Gap Analysis Tool. By using this tool, you agree to these Terms.
1. Permitted Use
For legitimate internal quality management purposes: gap analyses against API Spec 17D, internal reports, and API monogram licensing preparation for subsea wellhead and tree equipment manufacturers.
2. Prohibited Use
Misrepresenting compliance status to API, certification bodies, operators, or customers.
Reproducing or redistributing tool content without written permission from ISO Xpert.
Any unlawful use or violation of applicable laws and regulations.
3. Intellectual Property
All tool content is the intellectual property of ISO Xpert Ltd. API Spec 17D is the property of the American Petroleum Institute (API). This tool provides interpretive guidance only and does not reproduce the full standard text. ISO Xpert Ltd is not affiliated with API.
4. Disclaimer
This tool is provided "as is". Gap analysis results are indicative only and do not constitute formal certification, API monogram licence approval, or independent qualification evidence. Seek qualified professional advice for all subsea equipment certification and licensing decisions.
5. Governing Law
These Terms are governed by the laws of England and Wales.
6. Contact
ISO Xpert Ltd | 71-75 Shelton Street, Covent Garden, London WC2H 9JQ, UK | info@iso-xpert.com | +44 7853 109840
API Spec 17D Subsea Wellhead and Tree Equipment Gap Analysis Tool
Free interactive API Spec 17D gap analysis tool by ISO Xpert. Assess PSL-1, PSL-2, and PSL-3 compliance for subsea wellhead systems, subsea trees (vertical and horizontal), tubing hangers, subsea control systems, and subsea connectors and hubs. Covers QMS, design validation, subsea environmental requirements, materials, CRA cladding, welding, NDE, pressure testing, functional testing, cathodic protection, ROV interface requirements, marking, documentation, and additional requirements for deepwater and HPHT applications per API Spec 17D 2nd Edition.
API Spec 17D Subsea Wellhead & Tree Equipment — Frequently Asked Questions
Authoritative answers about API Spec 17D Subsea Wellhead & Tree Equipment, inspection intervals, qualifications, RBI, and ISO Xpert consulting.
What is API Spec 17D?
API Spec 17D is the American Petroleum Institute Specification for Design and Operation of Subsea Production Systems – Part 2: Subsea Wellhead and Tree Equipment. It covers the design, manufacturing, testing, and quality requirements for subsea wellhead systems, subsea trees (vertical and horizontal), tubing hangers, subsea connectors, and associated control system interfaces for use in offshore deepwater oil and gas production.
What PSL levels does API Spec 17D use?
API Spec 17D defines three Product Specification Levels. PSL-1 covers basic requirements. PSL-2 adds enhanced material testing, NDE, documentation, and traceability. PSL-3 applies the most stringent requirements including full volumetric NDE, witnessed testing, piece-level traceability, cathodic protection qualification, and additional qualification for HPHT and sour service deepwater applications.
What is the difference between a vertical and horizontal subsea tree?
A vertical Christmas tree (VCT) has the production bore vertical, with the tree running through the wellbore. Valves and chokes are arranged vertically. A horizontal Christmas tree (HCT or HXT) uses a tubing hanger with the production bore offset horizontally, with all valves and chokes mounted on a horizontal spool. HCTs allow the BOP stack to be set directly on the wellhead and are preferred for high-rate wells and deepwater applications.
What are the key subsea environmental requirements in API Spec 17D?
API Spec 17D includes specific requirements for subsea service including: external hydrostatic pressure design for water depth rating, cathodic protection system design and qualification, ROV (remotely operated vehicle) interface panel dimensions and function, marine growth protection, corrosion-resistant alloy (CRA) overlay on wetted surfaces, thermal insulation (for flow assurance), and chemical injection requirements for hydrate and scale inhibition.
Can ISO Xpert help with API Spec 17D monogram licensing?
Yes. ISO Xpert provides full API Spec 17D monogram licensing support including gap analysis, QMS documentation aligned to API Q1, subsea design review, qualification test planning, FAT and SIT procedure development, and audit preparation for subsea wellhead and tree equipment manufacturers. Contact us at info@iso-xpert.com or call +44 7853 109840.
