In the LNG industry today, the importance of top entry valves is continually rising, driven by rising awareness of the need for these kind of valves as well as design code demands, mainly in marine and cryogenic applications.
Both cryogenic and offshore pipelines are greatly affected by mechanical worries, coming either from a vessel deflection and ship motion, or from top reduction and growth levels, caused by temperature changes during the procedure.
Top Entry Ball Valves solutions
The top entry valve is the best solution for these challenges due to its one-piece body construction – offering top integrity with the pipeline on one hand and inline service capability on the other.
Anyway, valve construction of this type presents big engineering challenges, since all its inside parts have to be located and assembled through a one and relatively narrow top opening.
With a typical top entry valve, the key hurdle of an assembly or maintenance crew generally relates to the complexity of disassembly and assembly of the valve inside parts he time wasting process, and the need for unique tools and jigs which need to be operated by a highly expert staff.