Evaluation of tabular leg structure of mobile offshore production unit (MOPU) life extension using condition assessment method / Emi Hafizzul Jamaluddin … [et al.]

Jamaluddin, Emi Hafizzul and Razak, Azli Abd and Adenan, Mohd Shahriman and Mohamad, Mohd Faizal (2021) Evaluation of tabular leg structure of mobile offshore production unit (MOPU) life extension using condition assessment method / Emi Hafizzul Jamaluddin … [et al.]. Journal of Mechanical Engineering (JMechE), 8 (2). pp. 77-96. ISSN (eISSN):2550-164X

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Abstract

A Mobile Offshore Production Unit (MOPU) is any type of portable structure that can be reused when procuring oil and gas from the seabed. There are few reasons why MOPU is chosen over the conventional fixed offshore platforms, mainly due to its ability to be installed and relocated in a short period, low installation, and abandonment cost, and providing adequate time to evaluate new reservoirs properly. In certain circumstances, MOPU may be required to remain at the same location for a more extended period beyond its designed life. This paper explains the method of life extension (LE) assessment to extend the useful life of the MOPU. A MOPU with a three-legged jack-up rig in cruciform shape designed and constructed based on the American Bureau of Shipping (ABS) Classification requirement with a design life of 5 years, which currently in laid-up mode after 14 years in operation. The legs will be the focus of the condition assessment for the LE of the MOPU. The MOPU was constructed with 3 tabular legs with each 92200 mm length, 3500 mm diameter, and 55 mm thickness operate under tensile and shear stress, standing with simply supported at the one-end with hull hanged at the tabular using jacking-pin at the equal elevation of 77,600 mm. The method of assessment used is Non-destructive Tests (NDT). No severe defects or cracks were recorded at the identified stress concentration points. All NDT measurements were found within the acceptable ranges with no recorded anomalies.

Metadata

Item Type: Article
Creators:
Creators
Email
Jamaluddin, Emi Hafizzul
UNSPECIFIED
Razak, Azli Abd
azlirazak@uitm.edu.my
Adenan, Mohd Shahriman
UNSPECIFIED
Mohamad, Mohd Faizal
UNSPECIFIED
Subjects: T Technology > TN Mining engineering. Metallurgy > Nonmetallic minerals
Divisions: Universiti Teknologi MARA, Shah Alam > Faculty of Mechanical Engineering
Journal or Publication Title: Journal of Mechanical Engineering (JMechE)
UiTM Journal Collections: UiTM Journal > Journal of Mechanical Engineering (JMechE)
ISSN: (eISSN):2550-164X
Volume: 8
Number: 2
Page Range: pp. 77-96
Official URL: https://jmeche.uitm.edu.my/
Item ID: 47678
Uncontrolled Keywords: Condition Assessment, Life Extension, MOPU
URI: https://ir.uitm.edu.my/id/eprint/47678

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47678

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