Recommended Practice for Analysis, Design, Installation, and Testing of Safety Systems for Subsea Applications

API RECOMMENDED PRACTICE 17V FIRST EDITION, FEBRUARY 2015

ERRATA 1, JULY 2015

REAFFIRMED, JUNE 2020

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Copyright © 2015 American Petroleum Institute

Foreword

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Contents

Page

1. Scope 1

   1. General 1

   2. Organization of Technical Content 3

   3. Government Codes, Rules, and Regulations 3

2. Normative References 3

3. Terms, Definitions, Acronyms, and Abbreviations 4

   1. Safety Device Symbols and Identification 4

   2. Terms and Definitions 4

   3. Acronyms and Abbreviations 8

4. Introduction to Safety Analysis and System Design 10

   1. Purpose and Objectives 10

   2. Safety Flow Chart 10

   3. Safety System Operation 11

   4. Premises for Basic Analysis and Design 11

5. Protection Concepts and Safety Analysis 13

   1. Introduction 13

   2. Protection Concepts 13

   3. Safety Analysis 20

   4. Analysis and Design Procedure Summary 21

Annex A (normative) Process Component Analysis 22

Annex B (normative) Support Systems 55

Annex C (normative) Testing and Reporting Procedures 56

Bibliography 62

Figures

1. API RP 17V Scope 1

2. Safety Flow Chart–Subsea Production Facility 12

1. Recommended Safety Devices for Typical Trees and Flowline Segment 22

2. Recommended Safety Devices for a Typical Subsea Water Injection Tree 25

3. Recommended Safety Devices for a Typical Subsea Gas Injection Tree 25

4. Recommended Safety and Subsea Isolation Devices for a Typical Downhole Chemical Injection

   System 28

5. Recommended Safety and Subsea Isolation Devices for a Typical Chemical Injection System

   Above Production Master Valve 29

6. Production Manifold 32

7. Recommended Safety Devices for a Typical Subsea Separator 33

8. Recommended Safety Devices for a Typical Subsea Boosting Pump 37

9. Recommended Safety Devices for a Typical Subsea Compressor 39

10. Recommended Safety Devices and Subsea Isolation for Gas Lifting a Manifold via an External Gas

    Lift Line 43

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    Contents

11. Recommended Safety Devices and Subsea Isolation for Gas Lifting a Subsea Flowline or Riser via

    Page

    an External Gas Lift Line 44

12. Recommended Safety Devices for Gas Lifting a Subsea Well through the Casing String via an

    External Gas Lift Line 46

13. Recommended Safety Devices for Gas Lifting a Riser via Coil Tubing Contained within the Riser 49

Tables

1. SAT–Production Trees and Flowline Segment. 23

2. SAC–Production Trees and Flowline Segment 24

3. SAT–Injection Trees and Flowlines 26

4. SAC–Injection Trees and Flowlines 27

5. SAT–Chemical Injection Lines 30

6. SAC–Chemical Injection Lines 30

7. SAT–Manifold 32

8. SAC–Manifold 32

9. SAT–Subsea Separators 34

10. SAC–Subsea Separators 35

A.1 SAT–Subsea Boosting 38

1. SAC–Subsea Boosting 38

2. SAT–Compressors 40

3. SAC–Compressors 41

4. SAT–Gas Lift of Subsea Flowlines, Risers, and Manifolds via an External Gas Lift Line or Umbilical . . 44

5. SAC–Gas Lift of Subsea Flowlines, Risers, and Manifolds via an External Gas Lift Line or Umbilical . 45

6. SAT–Gas Lift of Subsea Well(s) through the Casing String via an External Gas Lift Line 47

7. SAC–Gas Lift of Subsea Well(s) through the Casing String via an External Gas Lift Line 47

8. SAT–Gas Lift of Risers via a Gas Lift Line Contained within the Riser 50

9. SAC–Gas Lift of Risers via a Gas Lift Line Contained within the Riser 50

10. SAT–HIPPS 52

11. SAC–HIPPS 52

12. SAT–SSIV 53

13. SAC–SSIV 53

C.1 Safety Device Test Data 61

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Introduction

This recommended practice (RP) presents a systematization of proven practices for providing a basic safety system for subsea applications. Proper application of these practices, along with good design, maintenance, and operation of the entire production facility can provide an operationally safe system.

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Recommended Practice for Analysis, Design, Installation, and Testing of Safety Systems for Subsea Applications

1 Scope

1.1 General

This recommended practice (RP) presents recommendations for designing, installing, and testing a process safety system for subsea applications. The basic concepts of subsea safety systems are discussed and protection methods and requirements of the system are outlined.

API 14C

For the purposes of this RP, ‘subsea system’ includes all process components from the wellhead (and surface controlled subsurface safety valve [SCSSV]) to upstream of the boarding shutdown valve. For gas injection, water injection, and gas lift systems, the shutdown valve is within the scope of API 17V. This also includes the chemical injection system. Refer to Figure 1.

API 17V

Figure 1—API RP 17V Scope

1