ISO 21905:2020
(Main)Gas turbine exhaust systems with or without waste heat recovery
Gas turbine exhaust systems with or without waste heat recovery
This document specifies requirements and gives recommendations for the design, materials of construction, modelling, controlling, fabrication, inspection, testing, installation, start-up and operation of industrial gas turbine (GT) exhaust systems with or without waste heat recovery unit (WHRU). Gas turbines can be on-shore or off-shore for such sectors as oil and gas, chemical and process industries, utilities, or other intensive energy users. For this document, the exhaust system means all items in the turbine exhaust gas stream between the GT exhaust gas collector outlet flange and the termination/s to the atmosphere. The following items are not covered by this document: — heat recovery steam generator equipment (HRSG); — supplementary fired systems; — auxiliary fired systems; — exhaust gas collector (also known as exhaust plenum); — fire detection and extinguishing systems; — emissions controls equipment intended to modify the gaseous composition of the exhaust gas; — WHRUs that are of the firetube type, where the turbine exhaust gas (TEG) passes through the tubes.
Systèmes d’échappement des turbines à gaz avec ou sans récupération de la chaleur résiduelle
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INTERNATIONAL ISO
STANDARD 21905
First edition
2020-03
Gas turbine exhaust systems with or
without waste heat recovery
Systèmes d’échappement des turbines à gaz avec ou sans récupération
de la chaleur résiduelle
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 3
5 Proposals . 5
5.1 Purchaser’s responsibilities . 5
5.2 Supplier’s responsibilities . 5
6 Basic exhaust system design . 5
6.1 General . 5
6.2 Exhaust system configuration . 6
6.3 Service life . 6
6.4 Supply responsibility . 6
6.5 GT characteristic data . 6
6.6 Required operating envelope . 6
6.7 Equipment specification . 6
6.8 WHRU equipment specification . 6
6.9 Operating conditions . 7
6.10 Operating environment . 7
6.11 Equipment arrangement . 7
6.12 Provision for future addition of WHRU . 7
6.13 Electrical equipment . 7
6.14 Field assembly and disassembly . 8
6.15 Special tools and fixtures . 8
6.16 Spare parts . 8
6.17 Deviations . 8
7 Documentation . 8
7.1 General . 8
7.2 Data sheets . 8
7.3 Supplier document requirements . 8
8 Exhaust system engineering and design .10
8.1 Overview .10
8.2 Typical WHRU configurations .10
8.3 General .10
8.4 TEG flow-induced vibrations .11
8.5 Exhaust system casing and ducting .11
8.5.1 General.11
8.5.2 Hot casing design and materials .13
8.5.3 Cold casing design material .14
8.5.4 Flange bolts .14
8.5.5 Surface preparation and treatment .16
8.6 Mechanical and thermal analysis .17
8.7 Insulation and refractory .17
8.7.1 Exhaust system casing and ducting external insulation (hot casing design) .18
8.7.2 Exhaust system casing and ducting internal insulation (cold case design) .18
8.8 Noise emission and silencing .21
8.9 Stacks.21
8.10 Expansion joints.22
8.11 Steel structures, stairs, ladders and platforms .23
8.12 Preservation, handling, packing and storage .24
8.12.1 Handling and storage of materials .24
8.12.2 Handling and storage of construction material and subcomponents at
suppers works .24
8.13 Inspection and testing .25
8.13.1 General inspection .25
8.13.2 Specific inspection requirements .25
9 WHRU engineering and design .26
9.1 WHRU process design .26
9.2 WHRU tube bundle mechanical design .28
9.2.1 General.28
9.2.2 Pressure part design .29
9.2.3 Corrosion allowances.30
9.3 WHRU tube bundle design .30
9.3.1 Tube and bend materials .30
9.3.2 Tube bundle design conditions .30
9.3.3 TEG flow-induced vibrations .32
9.3.4 Tube supports .33
9.3.5 Tube fins .34
9.3.6 Tube bundle headers .35
10 Dampers .36
10.1 General .36
10.2 WHRU dampers .36
10.2.1 Damper and isolator types and functions .
...
INTERNATIONAL ISO
STANDARD 21905
First edition
2020-03
Gas turbine exhaust systems with or
without waste heat recovery
Systèmes d’échappement des turbines à gaz avec ou sans récupération
de la chaleur résiduelle
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 3
5 Proposals . 5
5.1 Purchaser’s responsibilities . 5
5.2 Supplier’s responsibilities . 5
6 Basic exhaust system design . 5
6.1 General . 5
6.2 Exhaust system configuration . 6
6.3 Service life . 6
6.4 Supply responsibility . 6
6.5 GT characteristic data . 6
6.6 Required operating envelope . 6
6.7 Equipment specification . 6
6.8 WHRU equipment specification . 6
6.9 Operating conditions . 7
6.10 Operating environment . 7
6.11 Equipment arrangement . 7
6.12 Provision for future addition of WHRU . 7
6.13 Electrical equipment . 7
6.14 Field assembly and disassembly . 8
6.15 Special tools and fixtures . 8
6.16 Spare parts . 8
6.17 Deviations . 8
7 Documentation . 8
7.1 General . 8
7.2 Data sheets . 8
7.3 Supplier document requirements . 8
8 Exhaust system engineering and design .10
8.1 Overview .10
8.2 Typical WHRU configurations .10
8.3 General .10
8.4 TEG flow-induced vibrations .11
8.5 Exhaust system casing and ducting .11
8.5.1 General.11
8.5.2 Hot casing design and materials .13
8.5.3 Cold casing design material .14
8.5.4 Flange bolts .14
8.5.5 Surface preparation and treatment .16
8.6 Mechanical and thermal analysis .17
8.7 Insulation and refractory .17
8.7.1 Exhaust system casing and ducting external insulation (hot casing design) .18
8.7.2 Exhaust system casing and ducting internal insulation (cold case design) .18
8.8 Noise emission and silencing .21
8.9 Stacks.21
8.10 Expansion joints.22
8.11 Steel structures, stairs, ladders and platforms .23
8.12 Preservation, handling, packing and storage .24
8.12.1 Handling and storage of materials .24
8.12.2 Handling and storage of construction material and subcomponents at
suppers works .24
8.13 Inspection and testing .25
8.13.1 General inspection .25
8.13.2 Specific inspection requirements .25
9 WHRU engineering and design .26
9.1 WHRU process design .26
9.2 WHRU tube bundle mechanical design .28
9.2.1 General.28
9.2.2 Pressure part design .29
9.2.3 Corrosion allowances.30
9.3 WHRU tube bundle design .30
9.3.1 Tube and bend materials .30
9.3.2 Tube bundle design conditions .30
9.3.3 TEG flow-induced vibrations .32
9.3.4 Tube supports .33
9.3.5 Tube fins .34
9.3.6 Tube bundle headers .35
10 Dampers .36
10.1 General .36
10.2 WHRU dampers .36
10.2.1 Damper and isolator types and functions .
...
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