Ageing LNG Statics Equipment Life Extension – A Case Study
Authors: Houssam Sabry
Journal: Society of Petroleum Engineers
DOI: https://doi.org/10.2118/192963-MS
Abstract: ADNOC LNG is a pioneer LNG and Gas Operator, Owner and Exporter. ADNOC LNG owns and operates three LNG Trains in addition to operating five Gas Processing and Export Trains.
ADNOC LNG operates its facilities from Das Island which is approximately 186Km Offshore Abu Dhabi. ADNOC LNG commissioned two of its three LNG trains in 1977. Third LNG train was commissioned in 1994. The design lifetime of all the trains is 30 years.
Trains 1 and 2 have gone through a life extension study to extend its lifetime from 2007 till 2019. Furthermore, recently another longevity study was concluded to increase the lifetime of Trains 1 and 2 till 2024. Further study is being conducted to further extend the design lifetime of the three LNG trains till 2040. This paper shares ADNOC LNG experience in terms of lifetime extension in terms of LNG static equipment reviews for assets life extension.
These life extension studies were done through an ADNOC LNG multidisciplinary team. The team reviewed the entire LNG facilities. Facilities were divided into the following systems:
–Static Equipment
–Safety Critical Equipment
–Rotating Equipment
–Civil and Structures
–Electrical and Instrumentation
The static equipment assets life extension exercise started with data collection from all available static equipment integrity systems and tools. The following systems were used to extract data:
–Inspection Management System– containing the entire inspection and maintenance records for static equipment
–Risk Based Inspection (RBI) System
–Risk Based Assessment (RBA) exercises
–Focused Integrity Reviews
–CMMS (SAP Records)
–Root Cause Analysis (RCA) reports
–Fitness for Service (FFS) exercise
–Major Turn Around (TA) Reports
These data in terms of inspection and failure history, degradation rates, probability of failure and FFS results were all analysed to answer one question, which is whether these static equipment degradation rate would allow them to survive till 2040 and in case this is not possible then what would be the recommended actions, cost for these actions and its schedule. Hence a tecno-econimc evaluation for the recommendations was done.
In the paper ADNOC LNG will share the methodology of evaluation, share few cases in terms of longevity like the LNG storage tanks and export jetties in addition to key findings of the study.
Keywords: Life Extension, Aging, LNG, Assets Integrity, Static Equipment