Standard for Subsea High Integrity Pressure Protection Systems (HIPPS)

API STANDARD 17O

SECOND EDITION, JULY 2014

REAFFIRMED, FEBRUARY 2019

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Foreword

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Contents

Page

1. Scope 1

2. Normative References 1

3. Terms, Definitions, and Acronyms 2

   1. Terms and Definitions 2

   2. Acronyms, Abbreviations, and Symbols 5

4. System Considerations 8

   1. Introduction and Overview 8

   2. Production Characteristics 9

   3. Flowline Rupture Considerations 9

   4. Process Hazard and Risk Analysis 10

   5. Selection and Determination of SIL 10

   6. Safety Requirement Specification (SRS) 11

5. Design 12

   1. Design Basis Requirements 12

   2. Modes of Failure 15

   3. Temperature 16

   4. Pressure 16

   5. Control System Design 17

   6. Materials Class Rating 18

   7. External Hydrostatic Pressure 18

   8. Transportation and Installation Conditions 18

   9. Equipment Design 18

   10. Control Systems Components 19

   11. Factory Acceptance Testing (FAT) 22

   12. SIL Evaluation 22

   13. Piping and Structures Specific Design Requirements 22

6. Materials 23

   1. HIPPS Final Element Equipment 23

   2. HIPPS Control System and Final Element-mounted Control Devices 25

   3. Welding 25

   4. Coatings (External) 26

7. Quality Control 26

   1. General 26

   2. HIPPS Closure Devices—PSL 26

   3. Structural Components 28

   4. Lifting Devices 28

   5. Cathodic Protection 28

   6. Storing and Shipping 28

8. Equipment Marking 28

   
   

   v

   
   

   Contents

   
   

   Page

9. Validation 28

   1. General 28

   2. Validation for HIPPS Closure Devices (Isolation Valve) and Actuator 29

   3. Validation for Monitor/Bleed, Bypass, Injection Valves 30

   4. Validation for DCV 30

   5. Validation of Sensors, Logic Solvers, and Control System Devices 30

   6. Validation of HIPPS Final Element 32

10. Installation and Commissioning 32

    1. General 32

    2. Planning 32

    3. Installation 34

    4. Commissioning 35

Annex A (informative) Estimating SIL for Overall HIPPS Safety Instrumented Function 38

Annex B (informative) Human Contribution During Operation 42

Annex C (informative) Example PFDavg Calculation 43

Bibliography 45

Figures

1 Typical Subsea Production HIPPS Valve Diagram 8

A.1 Safety Instrumented Function (SIF) Example 39

Tables

1 SILs 10

C.1 Data for the Calculations 43

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Standard for Subsea High Integrity Pressure Protection Systems (HIPPS)

1. Scope

   This standard addresses the requirements for the use of high integrity pressure protection systems (HIPPS) for subsea applications. API 14C, IEC 61508, and IEC 61511 specify the requirements for onshore, topsides, and subsea safety instrumented systems (SIS) and are applicable to HIPPS, which are designed to autonomously isolate downstream facilities from overpressure situations. This document integrates these requirements in order to address the specific needs of subsea production. These requirements cover the HIPPS pressure sensors, logic solver, shutdown valves, and ancillary devices including testing, communications, and monitoring subsystems.

   
   

2. Normative References

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.

API Specification 6A, Specification for Wellhead and Christmas Tree Equipment

API Recommended Practice 6HT, Heat Treatment and Testing of Large Cross Section and Critical Section Components

API Recommended Practice 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations

API Specification 17D, Subsea Wellhead and Christmas Tree Equipment

API Specification 17E, Specification for Subsea Umbilicals

API Standard 17F, Standard for Subsea Production Control Systems

API Recommended Practice 17H, Remotely Operated Tools and Interfaces on Subsea Production Systems

API Recommended Practice 17P, Recommended Practice for Design and Operation of Subsea Production Systems—Subsea Structures and Manifolds

ANSI/ASME B31.3 1, 2, Process Piping

ANSI/ASME B31.8, Gas Transmission and Distribution Piping Systems

AWS D1.1 3, Structural Welding Code—Steel

IEC 61508, Parts 1 to 4 4, Functional safety of electrical/electronic/programmable electronic safety-related systems

IEC 61511, Part 1, Functional safety—Safety instrumented systems for the process industry sector

1. American National Standards Institute, 25 West 43rd Street, 4th Floor, New York, New York 10036, www.ansi.org.

2. ASME International, 2 Park Avenue, New York, New York 10016-5990, www.asme.org.

3. American Welding Society, 8669 NW 36 Street, #130, Miami, Florida 33166-6672, www.aws.org.

4. International Electrotechnical Commission, 3, rue de Varembé, P.O. Box 131, CH-1211, Geneva 20, Switzerland, www.iec.ch.

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