Identification of high surge pressure in LNG loading lines system and mitigation strategy

Noor Arnida Abdul Talip,Fadzrul Izwan Muhd Ali,Siti Farhana M Shaari,A Nzihou,N.A Amran,M Nasef,R Boopathy,B Abdullah,D.C.W Tsang,S Yusup

doi:10.1051/e3sconf/202128703015

Noor Arnida Abdul Talip, Fadzrul Izwan Muhd Ali + Show 8 more

Open Access

https://doi.org/10.1051/e3sconf/202128703015

Copy DOI

Abstract

This paper presents the criticality of surge simulation and analysis to establish if surge (pressure exceeding pipe design limit) is present upon ESD activation case during loading of LNG from loading lines to carrier.

Highlights

Proper design of LNG loading lines (Figure 1) and verification of ESD interlock systems are critical in ensuring overall safety of the LNG facility
This study focused on surge analysis using an appropriate tool, PIPENET to determine any exposure to high surge pressure and transient forces throughout the transfer lines plus mitigation plans to be implemented if necessary
Pressure at the upstream of ESD-1 valve gradually reduces to the final steady state pressure indicating that all system pressure in the pipe segments has been released via the kickback valves

Summary

Introduction

Proper design of LNG loading lines (Figure 1) and verification of ESD interlock systems are critical in ensuring overall safety of the LNG facility. ESD interlock is activated with ESD valves closure initiated simultaneously with all loading pumps trip and the kickback valves open. During the ESD valves closure, the pipeline can be exposed to a risk of high surge pressures exerted onto the wall. A pressure surge or liquid hammering phenomenon in piping systems can be caused by a fluid in motion forced to stop or change direction suddenly (rapid momentum change) and due to cavitation effect. Cavitation is caused by the formation and instantaneous collapse of vapour bubbles. The collapsing bubbles exert severe localized impact forces that can result in pressure surges

Methods

Findings

Discussion

Conclusion