《石油化工可燃气体排放系统设计规范》中管道摩阻损失计算方法分析

Petrochemical Design ›› 2025, Vol. 42 ›› Issue (3): 15-17.

• DESIGN TECHNOLOGY • Previous Articles Next Articles

**Analysis on Calculation Method for Pressure Drop in Design Specification for Combustible Gas Discharge System in Petrochemical Industry (SH 3009-2013)**

Xia Zhi，Liao Guojun

Wuhuan Engineering Co., Ltd., Wuhan, Hubei, 430000

Received:2024-10-25 Online:2025-08-25 Published:2025-08-25

Abstract

Abstract:

The emergency discharge system for combustible gas is an important component of safety facilities in petrochemical plants, and the correct calculation of pressure drop is a prerequisite for the rational design of the discharge system. To address the issue of pressure drop calculation method, this paper compares the calculation formulas adopted in SH 3009-2013 and API 521-2014, proves through theoretical derivation that the calculation formula for Mach number in SH 3009-2013 is incorrect, and further analyzes the impact of the incorrect calculation formula on the design of emergency discharge system for combustible gas. It is suggested that the calculation formula for Mach number is to be corrected during the revision of SH 3009-2013.

Key words: emergency discharge system, standard, Mach number; pressure drop

Xia Zhi, Liao Guojun.

Analysis on Calculation Method for Pressure Drop in Design Specification for Combustible Gas Discharge System in Petrochemical Industry (SH 3009-2013) [J].Petrochemical Design, 2025, 42(3): 15-17.

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**Analysis on Calculation Method for Pressure Drop in Design Specification for Combustible Gas Discharge System in Petrochemical Industry (SH 3009-2013)**

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