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API Spec 17D Specification for Subsea Wellhead and Tree Equipment, Third Edition, Includes Errata 1 (2021)
standard by American Petroleum Institute, 10/01/2021
This document provides specifications for subsea wellheads, mudline wellheads, drill-through mudline wellheads, and both vertical and horizontal subsea trees. It specifies the associated tooling necessary to handle, test, and install the equipment. It also specifies the areas of
design, material, welding, quality control [including factory acceptance testing (FAT)], marking, storing, and shipping for individual equipment, subassemblies, and subsea tree assemblies.
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API SPECIFICATION 17D
THIRD EDITION, OCTOBER 2021
API MONOGRAM PROGRAM EFFECTIVE DATE: OCTOBER 2022
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Scope. 1
Normative References 1
Terms, Definitions, Acronyms, Abbreviations, and Symbols 2
Terms and Definitions 2
Acronyms, Abbreviations, and Symbols 10
Application, Service Conditions, and Production Specification Levels 12
Application 12
Service Conditions 15
Product Specification Levels 15
Common System Requirements 16
Design and Performance Requirements 16
Materials 28
Welding 28
Quality Control 29
Equipment Marking 33
Storing and Shipping 34
General Design Requirements for Subsea Tree Systems 35
General 35
Tubing Head and Tree Valving 36
Thermally Induced Pressure Changes 45
Testing of Subsea Tree Assemblies 45
Marking 45
Storing and Shipping 45
Specific Requirements—Subsea Tree-related Equipment and Subassemblies 49
Flanged End and Outlet Connections 49
API Clamp Hub-type Connections 70
Threaded Connections 70
Other End Connectors 70
Studs, Nuts, and Bolting 70
Crosses, Tees, and Elbows 71
Completion Guidebase 71
Tree and Tubing Head Connectors 72
Tree Stab/Seal Subs for Vertical Tree 75
Valves, Valve Blocks, and Actuators/Operators 76
Re-entry Interface 89
Subsea Tree Cap 90
Tree Cap Running Tool. 93
Tree and Tubing Head Guide Frames 95
Tree Running Tool 98
Tree, Tubing Head, and Completion Guidebase Piping 101
Flowline Connections 103
Ancillary Equipment Running Tools 106
Tree-mounted Hydraulic/Electric/Optical Control Interfaces 107
Subsea Chokes and Actuators/Operators 111
Miscellaneous Equipment 121
Specific Requirements—Subsea Wellhead 122
General 122
Temporary Guidebase 123
Permanent Guidebase 124
Conductor (Low-pressure) Housing 129
Wellhead (High-pressure) Housing 131
Casing Hangers 134
Annulus Seal Assemblies 136
Casing Hanger Lockdown Bushing 137
Bore Protectors and Wear Bushings 139
Corrosion Cap 140
Running, Retrieving, and Testing Tools 140
Overtrawlable Protection Structure 140
Wellhead Inclination and Orientation 140
Submudline Casing Hanger and Submudline Annulus Seal Assemblies 140
Specific Requirements—Subsea Tubing Hanger System 141
Design 141
Materials 144
Testing 144
Specific Requirements—Mudline Suspension Equipment 145
General 145
Mudline Suspension-landing/Elevation Ring 149
Casing Hangers 149
Casing Hanger Running Tools and Tieback Adapters 150
Abandonment Caps 151
Mudline Conversion Equipment for Subsea Completions 151
Tubing Hanger System—Mudline Conversion Equipment for Subsea Completions 152
Specific Requirements—Drill-through Mudline Suspension Equipment 152
General 152
External Drill-through Casing Hangers (Outside of the Drill-through Casing Hanger Housing) 152
Drill-through Casing Hanger Housing 152
Internal Drill-through Mudline Casing Hangers 154
Internal Drill-through Annulus Seal Assemblies 156
Internal Drill-through Bore Protectors and Wear Bushings 156
Tubing Hanger System—Drill-through Mudline Equipment for Subsea Completions 157
Annex A (informative) Subsea Wellhead 158
Annex B (informative) Purchasing Guidelines 160
Annex C (informative) Alternate Requirements for Carbon and Low-alloy Steel Subsea Forgings 177
Annex D (informative) High-pressure High-temperature 179
Annex E (normative) Mudline Suspension and Conversion Systems 188
Annex F (informative) Assembly Guidelines of API Bolted Flanged Connections 195
Annex G (informative) Design and Testing of Pad Eyes for Lifting 202
Annex H (informative) Design and Testing of Subsea Wellhead Running, Retrieving, and Testing Tools 214
Annex I (informative) Procedure for the Application of a Coating System 216
Annex J (informative) Validation of Valves and Actuators/Operators 219
Annex K (informative) Screening Tests for Material Compatibility 224
Annex L (informative) Subsea Tubing Hanger 229
Annex M (informative) Drill-through Mudline Suspension Systems 233
Annex N (informative) Hyperbaric Testing Guidelines 235
Annex O (informative) Vertical Subsea Trees 237
Annex P (informative) Horizontal Subsea Trees 240
Bibliography 243
Figures
Example of a Dual-bore Tree on a Subsea Wellhead 38
Example of Vertical Trees on Tubing Heads 39
Examples of Horizontal Trees 40
Examples of Bore Penetrations 41
Examples of Tree Valving for Downhole Chemical Injection and SCSSV 43
Type 17SS Integral or Blind Flange 55
Alternate Rough and Finish Machining Detail for Corrosion-resistant BX-149 and BX-150 Ring Grooves 59
Weld End Preparation for Types 17SS and 17SV Welding Neck Flanges 59
Assembled Type 17SV Flange 61
Tree Guide Frames 97
Choke Common Orifice Configurations 112
External Loads on a Subsea Tree and Wellhead 127
Permanent Guidebase Loads 127
Typical Conductor (Low-pressure) Housing 130
Typical Wellhead (High-pressure) Housings. 132
A.1 Subsea Wellhead 159
PSL Decision Tree for Subsea Equipment 161
Examples of Subsea Tree P&ID 176
Mudline Suspension (Wellhead) and Conversion Equipment 189
Mudline Conversion Equipment 190
Stress Distribution, Axisymmetric Cross Section, Mudline Suspension Components 192
Limiting Stress Values, Mudline Suspension Components. 193
Flange-to-flange Alignment Tolerances 199
Cross-bolt Torque Tightening Sequence for One Tool, Two Tools, and Four Tools 200
Shackle and Pad Eye Profiles and Dimensions (Not to Scale) 204
Pad Eye Lift Sub Dimensions (Not to Scale) 206
Pictorial Representation of Lifting Set Showing the Angle of Sling Leg from Vertical 208
Localized Testing of Fabricated Pad Eyes 213
NDE Regions on Fabricated Pad Eyes 213
Concentric Tubing Hanger 230
Tubing Hanger with Multiple Bores 230
Tubing Hanger for Horizontal Tree 231
Extended Tubing Hanger for Horizontal Tree 232
M.1 Drill-through Mudline Suspension System 234
Guideline Style Vertical Tree 238
Guidelineless Style Vertical Tree 239
Guideline Style Horizontal Tree 241
Guidelineless Style Horizontal Tree 242
Tables
Material Requirements. 17
Equipment Standard Pressure Rating 18
Pressure Ratings for Internal Thread End or Outlet Connectors 19
Bolting Classifications and Material Requirements 21
Minimum Validation Requirements 26
Pressure Test Pictorial Representations 46
Rated Working Pressures and Size Ranges of API Flanges 49
API-type SBX Pressure-energized Ring Gaskets 51
Basic Flange and Bolt Dimensions for Type 17SS Flanges for 5000 psi (34.5 MPa) Rated Working Pressure 54
Basic Flange and Bolt Dimensions for 3/4 in. (19 mm) and 1 in. (25 mm) Type 17SS Flanges ... 56
Hub and Bore Dimensions for Type 17SS Line Pipe Welding Neck Flanges for 5000 psi (34.5 MPa) Rated Working Pressure 57
Rough Machining Detail for Corrosion-resistant API Ring Groove 58
Hub Dimensions for Type 17SV Flanges—USC Units 62
Ring Dimensions for Type 17SV Flanges—USC Units 64
Hub Dimensions for Type 17SV Flanges—SI Units 66
Ring Dimensions for Type 17SV Flanges—SI Units 68
Wellhead Systems—Standard Sizes and Types 72
Operating Parameters of Valves and Actuators/Operators 78
Center Distances of Conduit Bores for Dual Parallel Bore Valve Blocks 79
20a Example of PSL 2 Valve Factory Acceptance Test Documentation 84
20b Example of PSL 3 Valve Factory Acceptance Test Documentation 84
20c Example of PSL 3G Valve Factory Acceptance Test Documentation 85
Example Documentation of the Factory Acceptance Testing for a Hydraulic Actuator 85
Marking for Subsea Valve Actuator/Operator 87
Marking for Subsea Valve and Actuator/Operator Assembly 87
Example Documentation of the Factory Acceptance Testing for a Subsea Choke with Actuator/Operator—Mechanical Override Operational Test 115
Example Data Sheet for the Factory Acceptance Testing of a Hydraulic Actuator 117
Example Documentation of the Factory Acceptance Testing for the Operational Test of a Subsea Choke with Actuator/Operator 118
Example Data Sheet for the Factory Acceptance Testing of a Manual Operated Subsea Choke 118
Marking for Subsea Chokes 120
Marking for Subsea Choke Manual Operators 120
Marking for Subsea Choke Actuator/Operator 120
Marking for Subsea Choke and Actuator/Operator Assembly 120
Test Pressure 133
Recommended Minimum Vertical Bore Sizes for Casing Hangers, Bore Protectors, and
Wear Bushings 135
Maximum Allowable Stress Due to Pressure (for Mudline Equipment Only) 146
Drill-through Casing Hanger Housing—Pressure Rating and Test Pressure 154
C.1 SFC 2 Subsea Components 178
HPHT Equipment Standard Pressure Rating 180
Minimum CVN Absorbed Energy in Longitudinal and Transverse Direction 186
Example Flange Bolt Torques (0.07 Friction Factor) for 67 % Yield Strength Tension 197
Flange Connection Make-up Record 201
G.1 Enhancement Factors for Pad Eyes on Subsea Equipment 202
J.1 Valve Cycle Position 219
N.1 Hyperbaric Testing Guidelines 236
Specification for Subsea Wellhead and Tree Equipment
This document provides specifications for subsea wellheads, mudline wellheads, drill-through mudline wellheads, and both vertical and horizontal subsea trees. It specifies the associated tooling necessary to handle, test, and install the equipment. It also specifies the areas of design, material, welding, quality control [including factory acceptance testing (FAT)], marking, storing, and shipping for individual equipment, subassemblies, and subsea tree assemblies.
The user/purchaser is responsible for ensuring that subsea equipment meets any additional requirements of governmental regulations for the country in which it is installed. This is outside the scope of this specification.
This specification is not applicable to the rework and repair of used equipment. In situ testing is beyond the scope of this specification.
System integration test (SIT) is beyond the scope of this specification.
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies, except that new editions may be used on issue and shall become mandatory upon the effective date specified by the publisher or 6 months from the date of the revision (where no effective date is specified).
API Specification 5B, Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads
API Specification 5CT, Casing and Tubing
API Specification 5DP, Drill Pipe
API Specification 6A, Specification for Wellhead and Tree Equipment, 21st Edition API Standard 6AV1, Validation of Safety and Shutdown Valves for Sandy Service API Specification 16A, Specification for Drill-through Equipment
API Recommended Practice 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations
API Standard 17F, Standard for Subsea Production Control Systems
API Standard 17G, Design and Manufacture of Subsea Well Intervention Equipment
API Recommended Practice 17H, Remotely Operated Tools and Interfaces on Subsea Production Systems
API Recommended Practice 17P, Recommended Practice for Subsea Structures and Manifolds API Recommended Practice 17R, Recommended Practice for Flowline Connectors and Jumpers API Technical Report 17TR7, Verification and Validation of Subsea Connectors
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