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Natural Gas Compressor Filter High Dp

boil off gas

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#1 akashlovey


    Junior Member

  • Members
  • 19 posts

Posted 03 September 2018 - 01:47 PM

Ok finally i found the problem why my natural Gas compressors filter shows high DP when LNG tanker filling starts.


Operating Range or General Conditions :


Suction Temperature : -135 to -145 Deg C

Pressure : 100-200 mbarg


Problem 1)

Problem Arises when Vapour return from LNG tanker (truck) meets with Gas from Storage Tanks leads to increase in BOG Compressor suction temperature to -130 to -110 deg C . in this region Compressor suction filter reading shows very high .

Since Truck loading frequency is very high in our terminal having 4 bays of truck loading , so BOG suction temperature of compressors keeps on getting high and high unless Tanker filling to be stopped forcefully.


Truck is completely moisture free , hydrates free , always came with some heel .


Problem 2)

which is quite strange !


with Vendor A: LNG truck came with Pressure 7-8 barg. When equalising the truck pressure with our vapour line , vapour line temperature reaches -80 to -130 Deg C 



But with vendor B : truck with same pressure , when equalising vapour temperature reaches somehow -20 to -50 deg C and when tanker filling completed still vapour return temperature does not able to reach -100 sometimes.



We are having doubt with vacuum insulation of LNG trucks of vendor B.

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