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GB/T 45852-2025Gas turbine exhaust systems (English PDF)

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Issued by

State Administration for Market Regulation, Standardization Administration of China

Level / Type

National · Recommended

Issue date

August 1, 2025

Implementation date

February 1, 2026

Scope

GB/T 45852-2025 (Gas turbine exhaust systems) is available as an English-translated PDF.

GB/T 45852-2025 — This document provides information on the design, materials, this document is applicable to gas turbines for both land and sea use. Used in oil and gas, chemical industry, utilities or other high energy consuming industries.

The exhaust system in this document refers to all equipment between the outlet flange of the gas turbine exhaust diffuser and the atmosphere.

This document does not include the following equipment. ---Waste heat recovery boiler equipment (HRSG); ---Supplementary combustion system; ---Auxiliary combustion system; ---Exhaust diffuser section (also called exhaust chamber); ---Fire detection and extinguishing systems; --- Emission control equipment that affects exhaust composition; ---Fire tube waste heat recovery device, that is, a device in which turbine exhaust gas (TEG) passes through a fire tube.

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Document preview — GB/T 45852-2025

National Standard of the People's Republic of China

ICS: 27.040
Classification: K 56

Issued by: State Administration for Market Regulation, Standardization Administration of China

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Abbreviations
5 Technical Proposal
5.1 Purchaser's Responsibilities
5.2 Supplier Responsibility
6 Overall design of exhaust system
6.1 General Principles
6.2 Exhaust system configuration
6.3 Service life
6.4 Supply Responsibility
6.5 Gas Turbine Characteristic Data
6.6 Operating Range
6.7 Equipment Specifications
6.8 Waste Heat Recovery Equipment Specifications
6.9 Operating Conditions
6.10 Operating Environment
6.11 Equipment Layout
6.12 Reserved for adding waste heat recovery device
6.13 Electrical Equipment
6.14 On-site assembly and disassembly
6.15 Special tools and tools
6.16 Spare parts
6.17 Difference
7 Documents
7.1 General
7.2 Data Table
7.3 Supplier Document Requirements
8 Exhaust System Engineering and Design
8.1 Overview
8.2 Typical Waste Heat Recovery System Configuration
8.3 General
8.4 Vibration Induced by Gas Turbine Exhaust
8.5 Exhaust system housing and flue
8.6 Mechanical Analysis and Thermal Analysis
8.7 Insulation measures and refractory materials
8.8 Noise and Noise Reduction
8.9 Chimney
8.10 Expansion Joints
8.11 Steel structures, stairs, ladders and platforms
8.12 Protection, handling, packaging and storage
8.13 Inspection and testing
9 Waste Heat Recovery Device Engineering and Design
9.1 Process Design of Waste Heat Recovery Device
9.2 Mechanical Design of Waste Heat Recovery Unit Tube Bundle
9.3 Waste Heat Recovery Unit Tube Bundle Design
10 Baffle door
10.1 General Principles
10.2 Waste heat recovery device baffle door
11 Waste Heat Recovery System Control
11.1 General Principles
11.2 Guidance Note
12 Inspection and maintenance channel
12.1 Gas Turbine Exhaust Path
12.2 Waste Heat Recovery Device
13 Installation
14 Pre-commissioning and commissioning
15 Performance Test
Appendix A (Informative) Application of Computational Fluid Dynamics (CFD) in Exhaust System Design
Appendix B (Informative) Application of Thermal Analysis and Structural Analysis Technology in Exhaust System Design
Appendix C (Informative) Information provided by the purchaser
Appendix D (Informative) Fabrication and Welding
Appendix E (Informative) Data Sheet
Reference
Figure A.1 Example of CFD analysis output for exhaust duct
Figure A.2 Flowchart of using numerical modeling in exhaust duct design
Figure B.1 Exhaust gas temperature during start-up and shutdown
Table 1 Documents provided by suppliers to buyers for review
Table 2 Temperature limits of lining materials
Table 3 Exhaust Fouling Factor
Table 4 Tube bundle design application pressure specification
Table 5 Acceptance criteria for flow-induced vibration (frequency)
Table 6 Acceptance criteria for flow-induced vibration (speed)
Table 7 Acceptance criteria for flow-induced vibration (vibration)
Table 8 Maximum temperature of fin tip
Table 9 Fin selection
Table 10 Selection Guide for Baffle Doors and Isolation Devices
Table 11 Instrument regulations
Table 12 Valves 41 of tube bundle
Table B.1 Material Factor (Basic Operating Load)
Table B.2 ULS load combination
Table E.1 WHRU data sheet
Table E.2 Process design conditions
Table E.3 Mechanical design conditions

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is equivalent to ISO 21905:2020 "Gas turbine exhaust systems with or without waste heat recovery devices".

The following minimal editorial changes have been made to this document.

--- The original standard data sheet is merged into this document as informative Appendix E.

Introduction

This document is prepared based on the requirements of domestic and international markets for gas turbine exhaust and waste heat recovery system specifications.

Turbulence and mechanical design complexity, this document is helpful for buyers and suppliers to purchase, design and manufacture equipment.

Remote, complex and harsh environments on land or at sea may result in excessively high maintenance and repair costs.

The exhaust heat recovery device recovers heat energy from the exhaust gas turbine and transfers the waste heat to various heat transfer media such as water, water/acetylene Glycol mixtures, thermal oils and hydrocarbon gases.

Gas turbine exhaust is one of the various waste heat energy sources. Its typical temperature range is 400°C~600°C and can be classified as medium grade.

The application of exhaust heat recovery device can significantly improve thermal efficiency, reduce carbon dioxide emissions and improve environmental benefits.

Gas turbine exhaust system

1 Scope

This document provides information on the design, materials, this document is applicable to gas turbines for both land and sea use.

Used in oil and gas, chemical industry, utilities or other high energy consuming industries.

The exhaust system in this document refers to all equipment between the outlet flange of the gas turbine exhaust diffuser and the atmosphere.

This document does not include the following equipment.

---Waste heat recovery boiler equipment (HRSG);

---Supplementary combustion system;

---Auxiliary combustion system;

---Exhaust diffuser section (also called exhaust chamber);

---Fire detection and extinguishing systems;

--- Emission control equipment that affects exhaust composition;

---Fire tube waste heat recovery device, that is, a device in which turbine exhaust gas (TEG) passes through a fire tube.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

ISO 3744 Acoustics - Determination of sound power and energy levels of noise sources by the sound pressure method - Engineering method in the approximate free field above a reflecting surface Note. GB/T 3767-2016 Acoustics - Determination of sound power level and sound energy level of noise source by sound pressure method - Engineering method for approximate free field above reflecting surface (ISO 3744:2010, IDT) ISO 9614 (all parts) Acoustics—Determination of sound power levels of noise sources by sound intensity method Note. GB/T 16404 (all parts) Acoustics - Determination of sound power levels of noise sources by sound intensity method [ISO 9614 (all parts)] Note. GB/T 18253-2018 Types of inspection documents for steel and steel products (ISO 10474:2013, IDT) ISO 10494 Gas turbines and gas turbine units - Measurement of airborne noise - Engineering method/Simplified method Note. GB/T 14098-2020 Gas turbines and gas turbine units - Measurement of airborne noise - Engineering method/simplified method (ISO 10494:2018, IDT) ISO 13704 Petroleum, petrochemical and natural gas industries — Calculation of thickness of heating pipes for refineries

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 95 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 3744 · ISO 9614 · GB/T 16404 · ISO 10474 · ISO 10494 · ISO 13704

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