SIL verification and re-validation for LNG receiving terminal in operation

YUAN Xiaojun; LU Yi; ZHENG Shifu

doi:10.11949/j.issn.0438-1157.20150721

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SIL verification and re-validation for LNG receiving terminal in operation

更新时间：2025-12-10

- SIL verification and re-validation for LNG receiving terminal in operation
- CIESC Journal Issue S2, Pages: 271-278(2015)
- 作者机构：
  
  1. 风控(北京)工程技术有限公司IRC,北京,100025
  2. 广东大鹏液化天然气有限公司,广东,深圳,510848
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150721
  CLC： E8
- Online First：31 August 2015，
  
  Published：31 August 2015
- 稿件说明：
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YUAN Xiaojun, LU Yi, ZHENG Shifu. SIL verification and re-validation for LNG receiving terminal in operation[J]. CIESC Journal, 2015, (S2): 271-278.
DOI：

YUAN Xiaojun, LU Yi, ZHENG Shifu. SIL verification and re-validation for LNG receiving terminal in operation[J]. CIESC Journal, 2015, (S2): 271-278. DOI： 10.11949/j.issn.0438-1157.20150721.

摘要

广东大鹏LNG接收站作为中国最早投用的LNG接收站

在5年的高负荷运行后中新增并改造了部分设备及功能安全回路(SIF)

为确保接收站功能安全仪表系统(SIS)的完整性与可靠性以及高负荷生产的可用性

对所有生产设施及管线场站进行了HAZOP分析

并在HAZOP分析的基础上进行了SIL定级及再验证(re-validation)工作。本文以SIL再验证工作为例介绍SIL验算/再验证在在役装置中的应用

以及如何通过敏感性分析优化SIS系统配置与校验管理

满足企业风险可接受标准

最后总结并展望了实施SIL验算工作中的技术难点和未来的技术方向。

Abstract

As the earliest in-service LNG terminal in China

GDLNG terminal had adding/modifying some equipments and safety instrumented function (SIF) after five years' heavy duty operation.To ensure the integrity and reliability of the safety instrumented system (SIS) in terminal

and the availability under heavy duty operation

terminal had performed Hazard and operability study (HAZOP).Based on the hazardous scenarios identified in HAZOP

Safety integrity level (SIL) classification

SIL verification and SIL re-validation had been performed to LNG terminal.The SIL classification is using layer of protection analysis (LOPA) method

which is less conservative than risk graph method used in design phase.According to SIL verification result

some SIFs in the terminal can not match SIL classification requirement.Sensitivity analysis had been performed to those SIFs.Impacts of optimizing SIS system configuration (without component hardware change

i.e.

proof test interval

proof test coverage etc.) to the probability of failure on demand (PFD) had been studied.According to the sensitivity study result

SIL level can be somehow modified without component hardware change.Under certain circumstance

it can help us to a more cost-effective approach to fulfill company SIL requirement or risk acceptance criteria.Key technical points/difficulties and its possible solutions with SIL verification study are summarized

as well as the prospective development of SIL study.

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