Specification for Drill String Non-return Valves

API SPECIFICATION 7NRV FIRST EDITION, JULY 10, 2006

ADDENDUM 1, DECEMBER 2019

REAFFIRMED, JULY 2020

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Copyright © 2006 American Petroleum Institute

FOREWORD

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1. SCOPE 1

2. NORMATIVE REFERENCES 2

3. TERMS AND DEFINITIONS 2

4. REQUIREMENTS 3

   1. General 3

   2. Design requirements 4

   3. Functional considerations 4

   4. Design considerations 4

   5. Verification test 5

5. MATERIALS. 5

   1. General 5

   2. Metals 5

   3. Non-metals 5

   4. Traceability 6

6. QUALITY CONTROL REQUIREMENTS 6

   1. General 6

   2. Documentation retention 6

   3. Personnel qualifications 6

   4. Calibration systems 6

   5. Inspection of elastomeric materials 7

   6. Dimensional inspection 7

   7. Thread inspection 7

   8. Welding and brazing 7

   9. Qualification of heat treatment equipment 7

   10. Coatings, overlays, and surface treatments 8

   11. Mechanical and physical properties (where required by this Standard) 8

   12. NDE requirements 8

7. TESTING 10

   1. General 10

   2. Verification testing 11

   3. General requirements for an NRV verification test facility 11

   4. NRV verification test procedure 11

   5. NRV Nitrogen Pressure Test 12

   6. NRV Hydro Pressure Test. 12

   7. NRV Cycle Test 12

   8. NRV Erosion Test (record results as per Table A.1) 12

   9. RV Float Sub and NRV Landing Nipple testing 13

   10. NRV Equalizing Head testing 13

   11. Verification test for seal materials 14

   12. Production Testing 14

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8. IDENTIFICATION, DOCUMENTATION AND PREPARATION FOR TRANSPORT 15

   1. Identification 15

   2. Documentation 15

   3. Preparation for transport 16

APPENDIX A MINIMUM TEST DATA 17

Tables

1. Minimum Test Data Collection for Drill String Non-return Valve (NRV)

   Sample Form 17

2. Minimum Test Data Collection for NRV Float Subs and Landing Nipples

   - Sample Form 18

3. Minimum Test Data Collection for NRV Equalizing Head - Sample Form 18

Specification for Drill String Non-return Valves

0 Introduction

This standard has been developed by users/purchasers and suppliers/manufacturers of Drill String Non-return Valve equipment intended for use in the petroleum and natural gas industry worldwide. This Standard is intended to give requirements and infor- mation to both parties in the selection, manufacture, testing and use of Drill String Non-return Valve equipment. Further, this Standard addresses requirements that set the minimum parameters with which the supplier/manufacturer must comply to claim conformity with this standard.

Users of this standard should be aware that further or differing requirements might be needed for individual applications. This standard is not intended to inhibit a supplier/manufacturer from offering, or the user/purchaser from accepting, alternative equip- ment or engineering solutions. This may be particularly applicable where there is innovative or developing technology. Where an alternative is offered, the supplier/manufacturer should identify any variations from this standard and provide details.

This document does not cover maintenance and inspection once the NRV has left the manufacturer and is in operation. These are important to the safety and reliability of the equipment and should be considered.

1. Scope

   This standard was formulated to provide the minimum acceptable requirements for Drill String Non-return Valve (NRV) equip- ment. It covers Drill String Non-return Valves, Non-return Valve Subs, Non-return Valve landing nipples, Non-return Valve Equalizing Heads and all components that establish tolerances and/or clearances which may affect performance or interchange- ability of the NRV equipment. Non-return Valve Subs, Non-return Valve landing nipples, Non-return Valve Equalizing Heads and NRVs manufactured by different facilities or manufacturers may be supplied as separate items.

   
   

2. Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this stan- dard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the norma- tive documents indicated below. For undated references, the latest edition of the normative document referred to applies.

API

Spec 5CT/ISO 11960 Specification for Casing and Tubing

Spec 7 Specification for Rotary Drill Stem Elements

RP 13B-1 Standard Procedure for Field Testing Water-Based Drilling Fluids

RP 14B/ISO 10417 Design Installation, Repair and Operation of Subsurface Safety Valve Systems

MPMS, Chapter 10.4 Determination of Sediment and Water in Crude Oil by the Centrifuge Method (Field Procedure)

ANSI1/NCSL

Z540-1 General Requirements for Calibration Laboratories and Measuring and Test Equipment

ASME 2

Boiler and Pressure Vessel Code,

Section II Materials specification

Section V Nondestructive testing

Section VIII Pressure vessels

Section IX Welding and brazing qualifications

ASNT3

SNT-TC-1A Personnel qualification and certification in nondestructive testing

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

2American Society of Mechanical Engineers, 345 East 47th Street, New York, New York 10017-2392.

3American Society for Nondestructive Testing, P.O. Box 28518, 1711 Arlingate Lane, Columbus, Ohio 43228-0518.

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