Weathering effects on tensile and stress rupture strength of glass fiber reinforced vinylester and e...

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" Weathering effects on tensile and stress rupture strength of glass fiber reinforced vinylester and epoxy thermoset pipes "
Syed Nizamuddin N. Merah

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	53401
Doc. No	:	TL23355
Call number	:	‭1533945‬
Main Entry	:	Syed Nizamuddin
Title & Author	:	Weathering effects on tensile and stress rupture strength of glass fiber reinforced vinylester and epoxy thermoset pipes\ Syed Nizamuddin
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	2008
Degree	:	M.S.
student score	:	2008
Page No	:	230
Abstract	:	Glass fiber reinforced vinylester (GFRE) and epoxy (GFRE) pipes have been used for more than three decades to mitigate corrosion problems in oil fields, chemical and industrial plants. In these services, both GFRV and GFRE pipes are exposed to various environmental conditions. Long-term mechanical durability of these pipes after exposure to environmental conditions, which include natural weathering exposure to seasonal temperature variation, sea water, humidity and other corrosive fluids like crude oil, should be well known. Although extensive research has been undertaken, several major issues pertaining to the performance of these pipes under a number of environmental conditions still remain unresolved. The main objective of this study is to investigate the effects of natural weathering, combined natural weathering with seawater and crude oil exposure, for time periods ranging from 3 to 36 months respectively, on the tensile and stress rupture behavior of GFRV and GFRE pipes. Ring specimens are machined from GFRV and GFRE pipes and tested before and after exposure to different weathering conditions prevalent in the eastern region (Dhahran) of Saudi Arabia and present under service conditions. The natural weathering and combined natural weathering with crude oil exposure of GFRV specimens revealed increased tensile strength even after 36 months of exposure when compared with that of the as received samples. However, the combined natural weathering with seawater exposure of GFRV samples revealed better tensile behavior till 24 months of exposure, and after 36 months their tensile strength was seen to be below that of the as received GFRV samples. The stress rupture behavior of natural weather exposed GFRV samples showed an improvement after 12 months of exposure and it decreased after 24 and 36 months of exposure when compared with the as received GFRV samples. The combined natural weathering with crude oil and seawater exposure of GFRV sample revealed improved stress rupture behavior after 12 months of exposure. The as received GFRE pipe specimens revealed higher average tensile strength when compared to the as received GFRV sample, whereas the stress rupture behavior was comparatively low. The seawater exposure of the GFRE specimens resulted in drastic reduction in both tensile and stress rupture properties. Fractographic analysis was performed using an optical microscope and SEM in order to explain the possible controlling mechanisms of failure.
Subject	:	Applied sciences; Mechanical engineering; Materials science; 0548:Mechanical engineering; 0794:Materials science
Added Entry	:	N. Merah
Added Entry	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)