Petroleum, Petrochemical and Natural Gas Industries—Steam Turbines— Special-purpose Applications

ANSI/API STANDARD 612

SIXTH EDITION, NOVEMBER 2005

ISO 10437, (Identical) Petroleum, petrochemical and natural gas industries—Steam turbines—Special- purpose applications

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Copyright © 2005 American Petroleum Institute

API Foreword

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Contents

Page

API Foreword ii

Foreword vi

Introduction vii

1. Scope 1

2. Normative references 1

3. Terms and definitions 4

4. Dimensions 8

5. Statutory requirements 8

6. Basic design 8

   1. General 8

   2. Nameplates and rotation arrows 11

7. Casings 12

   1. Pressure casings 12

   2. Casing connections 14

   3. Internal stationary components 15

   4. External forces and moments 15

8. Rotating elements 15

   1. General 15

   2. Shafts 16

   3. Blading 16

   4. Speed-sensing element 17

9. Rotor dynamics 17

   1. General 17

   2. Lateral analysis 18

   3. Unbalanced rotor response verification test 23

   4. Additional testing 24

   5. Torsional analysis 25

   6. Vibration and balancing 26

10. Bearings, bearing housings, and seals 27

    1. Radial bearings 27

    2. Thrust bearings and collars 28

    3. Bearing housing 29

    4. Grounding 29

    5. Shaft seals 29

11. Materials 30

    1. General 30

    2. Castings 31

    3. Welding 32

12. Controls and instrumentation 33

    1. General 33

    2. Turbine governing system 33

    3. Overspeed shutdown system 36

       1. General 36

       2. Electronic overspeed detection system 37

       3. Electro-hydraulic solenoid valves 37

       4. Trip valves/combined trip and throttle valves 37

    4. Other alarms and shutdowns 39

1. Instrument and control panels 40

2. Indicating instrumentation 41

   1. Tachometers 41

   2. Temperature gauges 41

   3. Thermowells 41

   4. Thermocouples and resistance temperature detectors 41

   5. Pressure gauges 41

1. Electrical systems 41

2. Piping and appurtenances 41

   1. General 41

   2. Oil piping 42

   3. Instrument piping 42

3. Accessories 42

   1. Couplings and guards 42

   2. Gear units 42

   3. Mounting plates 43

      1. General 43

      2. Baseplates 44

      3. Soleplates and subplates 45

   4. Relief valves 45

   5. Lubrication and control-oil system 45

   6. Gland vacuum systems 46

   7. Insulation and jacketing 46

   8. Turning gear 47

   9. Special tools 47

4. Inspection, testing and preparation for shipment 47

   1. General 47

   2. Inspection 48

      1. General 48

      2. Materials inspection 48

      3. Mechanical inspection 49

   3. Testing 49

      1. General 49

      2. Casing pressure hydro tests 50

      3. Mechanical running test 51

      4. Optional tests and inspections 52

   4. Preparation for shipment 54

5. Vendor’s information 55

   1. General 55

   2. Proposals 56

      1. General 56

      2. Drawings 56

      3. Technical data 56

      4. Curves 57

   3. Contract data 57

      1. General 57

      2. Drawings and technical data 58

      3. Parts lists and recommended spares 58

      4. Installation, operation, maintenance and technical manuals 58

Annex A (informative) Typical data sheets 59

Annex B (informative) Steam turbine nomenclature 80

Annex C (normative) Procedures for determining residual unbalance 82

Annex D (informative) Alarm and shutdown systems 88

Annex E (normative) Coupling guards 90

Annex F (informative) Foundation drawings 92

Annex G (informative) Gland sealing and leak-off system 96

Annex H (informative) Typical inspection of components 98

Annex I (informative) Inspector's checklist 99

Annex J (informative) Vendor drawing and data requirements (VDDR) 101

Bibliography 113

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 10437 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 6, Processing equipment and systems.

This second edition cancels and replaces the first edition (ISO 10437:1993), which has been technically revised.

Introduction

This International Standard is based on API Std 612, fourth edition, June 1995.

Users of this International Standard should be aware that further or differing requirements may be needed for individual applications. This International Standard is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This may be particularly appropriate where there is innovative or developing technology. Where an alternative is offered, the vendor should identify any variations from this International Standard and provide details.

This International Standard requires the purchaser to specify certain details and features.

A bullet () at the beginning of a clause or subclause indicates that either a decision is required or further information is to be provided by the purchaser. This information or decision should be indicated on the data sheets; otherwise it should be stated in the quotation request (inquiry) or in the order.

In this International Standard, where practical, US Customary units have been included in brackets for information.

Petroleum, petrochemical and natural gas industries — Steam turbines — Special-purpose applications

1. Scope

   
   

   This International Standard specifies requirements and gives recommendations for the design, materials, fabrication, inspection, testing and preparation for shipment of steam turbines for special-purpose applications. It also covers the related lube-oil systems, instrumentation, control systems and auxiliary equipment. It is not applicable to general-purpose steam turbines, which are covered in ISO 10436.

   
   

   NOTE For the purpose of this provision, API Std 611 is equivalent to ISO 10436.

   
   

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.

ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation.

ISO 261, ISO general-purpose metric screw threads — General plan

ISO 262, ISO general-purpose metric screw threads — Selected sizes for screws, bolts and nuts

ISO 724, ISO general-purpose metric screw threads — Basic dimensions

ISO 965 (all parts), ISO general-purpose metric screw threads — Tolerances

ISO 1940-1, Mechanical vibration — Balance quality requirements of rigid rotors — Part 1: Determination of permissible residual unbalance

ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering method in an essentially free field over a reflecting plane

ISO 7005-1, Metallic flanges — Part 1: Steel flanges

ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges

ISO 8068, Petroleum products and lubricants — Petroleum lubricating oils for turbines (categories ISO-L-TSA and ISO-L-TGA) — Specifications

ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings

ISO 8821, Mechanical vibration — Balancing — Shaft and fitment key convention