Gate valve bonnet failures from thermal expansion of fluids at high temperature - In a steam-assisted gravity drainage application, immediately after start-up, a gate valve bonnet failure caused a release of pressure to atmosphere. In thermal applications throughout the oil and gas industry, there have been incidents of valve failures during start-up. Resulting damage can include stretching studs and loss of pressure integrity between the body and bonnet. The main cause is pressure build-up in the gate valve cavity from thermal expansion of fluids, which was completely full and isolated. Such pressure exceeded the rated working pressure of the valve.
Norwegian oil giant holding on to semisub for at least another three wells as it hatches second of four options
First development wells under way at deep-water field project in US Gulf of Mexico
State player to take over government's majority holding in major downstream company
Ocean Rig faces non-conformities on semisub after winter audit by Norwegian safety watchdog
US oilfield services giant's top line much improved last year but still stuck in red on tax law change
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Dutch floater giant starts steel-cutting at Dyna-Mac yard for ExxonMobil’s giant oil scheme off Guyana
Statoil and BP target fresh investments at Algerian gas plant hit by deadly terrorist attack five years ago
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