Volume 5, Issue 5
Published: September 18, 2017
Sealing the standards for LNG

With the liquefied natural gas (LNG) industry representing a high business potential for valve manufacturers, trunnion mounted ball valves (TMBV) are being used extensively for cryogenic service. The performance requirements for valves handling LNG are among the most demanding in any industry, especially with regard to low-temperature performance at temperatures of around 163° C, bubble-tight seat sealing, and stringent fugitive emissions requirement. These cryogenic service applications are governed by several industry and IOC standards: BS6364, ISO 28921-2, Total GSEP PVV 150 and Shell SPE MESC 77-300. BS6364 from the British Standard Institution is the most commonly used standard for valve cryogenic testing in the LNG industry, but it is also the oldest (having not been revised since 1984). As a result, the standard’s maximum allowable seat leakage rate remains the highest among other standards (see Figure 1). IOC and Shell standards in particular have designated their valves more in line with the technological progress of the valve industry. As indicated in Figure 1, the maximum allowable seat leakage specified by Shell MESCSPE 77-300 is half of the most severe international standards. In addition to extreme low leakage rate, Shell requires very severe high temperature cycling.

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