Packaged, Integrally Geared Centrifugal Air Compressors for Petroleum, Chemical, and Gas Industry Services

API STANDARD 672

FOURTH EDITION, MARCH 2004

ERRATA, OCTOBER 2007

ERRATA 2, JULY 2010

Packaged, Integrally Geared Centrifugal Air Compressors for Petroleum, Chemical, and Gas Industry Services

Downstream Segment

API STANDARD 672

FOURTH EDITION, MARCH 2004

ERRATA, OCTOBER 2007

ERRATA 2, JULY 2010

SPECIAL NOTES

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API is not undertaking to meet the duties of employers, manufacturers, or suppliers to warn and properly train and equip their employees, and others exposed, concerning health and safety risks and precautions, nor undertaking their obligations under local, state, or fed- eral laws.

Information concerning safety and health risks and proper precautions with respect to par- ticular materials and conditions should be obtained from the employer, the manufacturer or supplier of that material, or the material safety data sheet.

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Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. Sometimes a one-time extension of up to two years will be added to this review cycle. This publication will no longer be in effect five years after its publication date as an operative API standard or, where an extension has been granted, upon republication. Status of the publication can be ascertained from the API Standards department telephone

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   This document was produced under API standardization procedures that ensure appropri- ate notification and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this standard or com- ments and questions concerning the procedures under which this standard was developed should be directed in writing to the Director of the Standards department, American Petro- leum Institute, 1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce or translate all or any part of the material published herein should be addressed to the Director, Business Services.

   API standards are published to facilitate the broad availability of proven, sound engineer- ing and operating practices. These standards are not intended to obviate the need for apply- ing sound engineering judgment regarding when and where these standards should be utilized. The formulation and publication of API standards is not intended in any way to inhibit anyone from using any other practices.

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   All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005.

   Copyright © 2004, 2007 American Petroleum Institute

   
   

   FOREWORD

   
   

   API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal regulation with which this publication may conflict.

   Suggested revisions are invited and should be submitted to API, Standards department, 1220 L Street, NW, Washington, DC 20005.

   
   

   iii

   
   

   Page 0 INTRODUCTION 1

   1. SCOPE 1

   2. NORMATIVE REFERENCES 1

   3. DEFINITION OF TERMS 2

   4. GENERAL 4

      1. Unit Responsibility 4

      2. Nomenclature 4

   5. REQUIREMENTS 4

      1. Units of Measurement 4

      2. Statutory Requirements 4

      3. Alternative Designs 4

      4. Conflicting Requirements 4

   6. BASIC DESIGN 4

      1. General 4

      2. Pressure Casings 6

      3. Casing Connections 7

      4. External Forces and Moments 7

      5. Rotating Elements 7

      6. Seals and Sealing Systems 8

      7. Dynamics 8

      8. Bearings and Bearing Housings 9

      9. Lubrication 10

      10. Materials 11

      11. Nameplates and Rotation Arrows 12

      12. Additional Requirements for Special Duty Packages 13

   7. ACCESSORIES 14

      1. Drivers 14

      2. Couplings and Guards 15

      3. Baseplate/Support Structure 15

      4. Controls and Instrumentation 16

      5. Piping 20

      6. Intercoolers and Aftercoolers 21

      7. Inlet Air Filter/Silencer 21

      8. Discharge Blowoff Silence 22

      9. Special Tools 22

      10. Additional Requirements for “Special Duty” packages. 22

   8. INSPECTION, TESTING AND PREPARATION FOR SHIPMENT 23

      1. General 23

      2. Inspection 23

      3. Testing 24

      4. Preparation for Shipment 26

      5. Additional Inspection, Testing & Preparation for Shipment Requirements

for “Special Duty” Packages 26

Page 9 VENDOR DATA 27

1. General 27

2. Proposals 28

3. Contract Data 29

4. Additional Vendor Data Requirements for “Special Duty” Packages 30

ANNEX A DATA SHEETS 31

ANNEX B REFERENCED DOCUMENTS 89

ANNEX C (INFORMATION ON ROTORDYNAMIC ANALYSIS) 91

ANNEX D VENDOR DRAWINGS AND DATA REQUIREMENTS 101

ANNEX E LUBRICATION SYSTEM SCHEMATIC 107

ANNEX F REQUIREMENT FOR DETERMINING RESIDUAL

UNBALANCE 111

ANNEX G INSPECTOR’S CHECKLIST 117

ANNEX H GUIDE TO NOMENCLATURE 119

Figures

C-1 Undamped Unbalanced Response Analysis 92

C-2 97

C-3 98

E-1 109

1. Residual Unbalance Worksheet 113

2. Sample Calculations for Residual Unbalance 115

H-1 119

Tables

3 Equipment Monitoring 19

E-1 Lube-oil System Requirements 114

G-1 Inspector’s Checklist 117

Packaged, Integrally Geared Centrifugal Air Compressors for Petroleum, Chemical, and Gas Industry Services

0 Introduction

Users of this International Standard should be aware that further or differing requirements may be needed for individual appli- cations. 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 Stan- dard and provide details.

Annex A contains data sheets which purchasers are encouraged to use. Annex B provides information on normative references.

Annex C specifies requirements for lateral analysis.

Annex D contains forms which may be used to indicate vendor drawing and data requirements. Annex E contains schematic drawings of lubrication systems.

Annex F specifies requirements for determining residual unbalance. Annex G contains an inspector’s checklist.

Annex H contains an illustration of nomenclature for integrally geared centrifugal air compressors. This International Standard requires the purchaser to specify certain details and features.

A bullet () at the beginning of a paragraph indicates that either a decision or further information is required. Further informa- tion should be shown on the data sheets (see example in Annex A) or stated in the quotation request and purchase order.

In this International Standard, where practical, US Customary units are included in brackets for information

1 Scope

1.1 This standard covers the minimum requirements for constant-speed, packaged, general purpose integrally geared centrifu- gal air compressors, including their accessories. This standard is not applicable to machines that develop a pressure rise of less than 0.35 bar (5.0 psi) above atmospheric pressure, which are classed as fans or blowers.

Note: Special Purpose and Process applications, including Process Air Services, are covered by API Std 617.

• 1.2 Equipment covered by this standard is considered non-critical, usually spared and may be either of two classifications, Basic or Special Duty. The purchaser shall specify which of the two classifications applies.

Basic packages are vendors’ standard packages of proven design and include minimal additional requirements.

Special duty packages are typically specified for installations that require higher availability and include additional features and requirements.

1. Additional or overriding requirements applicable only to packages that have been specified as “Special Duty” are noted at the end of each section (see 6.12; 7.10; 8.5; and 9.4).

2. Conflicting Requirements

In case of conflict between this standard and the inquiry, the inquiry shall govern. At the time of the order, the order shall govern.

1. Normative References

   1. Reference publications are listed in Annex B.

   2. All referenced standards, to the extent specified in the text, are normative.

1