GB/T 46473-2025 English PDF - NG Screw Expander Standard

Full Standard Name

Natural gas screw expander unit

Standard Details

Sector / Industry Energy

Standard Type GB/T (Recommended)

Standard Status Valid

Older Standard None

CCS Classification K59

ICS Classification 27.040

Issue Date 2025-10-31

Implementation Date 2026-05-01

File Type PDF

PDF Page Count About 23 pages

Competent Department China Electrical Equipment Industry Association

Quoted Standard GB/T 755,GB/T 3797,GB/T 3836,GB/T 4942

GB/T 46473-2025 (English Version)

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GB/T 46473-2025 (Chinese Version)

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Standard Introduction

This document establishes the classification by structural types, technical requirements, explosion-proof requirements, safety requirements, test methods, inspection rules, marking, factory documentation, packaging, transportation and storage of natural gas screw expander (units).

This document applies to natural gas screw expander (units) with a design pressure not exceeding 10 MPa that utilize the pressure energy of natural gas pipeline networks to output power for driving generators or powering mechanical equipment such as fans and water pumps.

This document also applies to screw expander (units) used in explosive hazardous areas where flammable gas and vapor mixtures of Group ⅡA, ⅡB, ⅡC and Temperature Class T1 to T4 are present or may be present.

Other types of screw expander (units) that generate power using flammable and explosive gases shall refer to the provisions of this document.

Standard Catalog

The standard consists of the following main sections:

Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification by Structural Types
5 Technical Requirements
6 Explosion-Proof Requirements
7 Safety Requirements
8 Test Methods
9 Inspection Rules
10 Marking, Factory Documentation, Packaging, Transportation and Storage
Appendix A (Normative) Power Generation Requirements for Natural Gas Screw Expander Generator Sets
Appendix B (Normative) Configuration and Installation Location of Combustible Gas Detection and Alarm Systems for Natural Gas Sites
Appendix C (Normative) Control and Protection
Appendix D (Normative) Air Tightness Test
References

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