flow metering of LNG
flow metering of LNG
(OP)
I was wondering if pressure and temperature has to be taken in account while metering volume flow of LNG? Are there other important factors to take in account? My experiences basically lays in the custody metering of natural gas.





RE: flow metering of LNG
I would guess that since there is a range in LNG constituents depending on source of LNG ( rich vs lean), you would also need to apply a correction based on C1-C2-C3-C4 constituents.
RE: flow metering of LNG
RE: flow metering of LNG
Then the density is either contractually stated in either tables or the density is arrived at or samples are taken and the NIST REFPROP program (or othe EOS as set out in contracts) are used to derive the gallons or energy content based on the compostion and the loading conditions (typically the loaded temperature is used to set the conditions to calculate the density). The reason you only need the temperature is because the LNG is at bubble point, so composition plus either temperature or pressure automatically sets the the missing value of press or temp..
RE: flow metering of LNG
As we were informed, US metering can handle much more flow and as such requires minimum installation space compared with coriolis. In case of coriolis meters several units has to be put in parallel, however, coriolis measure mass (density incl.) US measures volume and requires the density for calculation mass flow.
RE: flow metering of LNG
The problem is I have not found an ultrasonic that has a design temp of -250F
RE: flow metering of LNG
RE: flow metering of LNG
RE: flow metering of LNG
RE: flow metering of LNG
I've seen LNG contracts that have a fixed density value.