ZENITH OFFSHORE VENT TIP REPLACEMENT This paper is intended to provide an overview of the removal and replacement of a cold vent tip, completed on an offshore oil rig located off the coast of Malaysia. Background Zenith SAS were approached by a multinational oil and gas provider to propose an innovative solution to remove and replace a defective cold vent tip at the head of a 30m steel stack on one of their production rigs off the Malaysian coast, without the use of a costly barge crane. The original design intent for tip replacement involved having to rotate the stack through 90 o at the base; this would have allowed access to the tip at platform level. However, due to maintenance issues, and previous modifications to the rig, this option was no longer deemed viable by t

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