6 replies to this topic

[sachico28]

for example at the outlet of the vaporizer at the flow meter you have a reading of 1000 m3/hr the temperature at the outlet is 15 deg C and the pressure is 46 barg. at the inlet of the vaporizer (This is LNG) the temperature is -147 deg C and the pressure is 50 barg. how can i compute for the volume of LNG in m3 from this data.

 

[Bobby Strain]

Check my website.

 

Bobby

[Vegeta]

You calculate the number of moles at the vaporizer outlet via an equation of state (given V, P, T). Once you get the moles, you can easily convert them to mass and volume of LNG via the molecular weight and density.

Hope this helps...

Reg

[Bobby Strain]

The above is not quite correct. Is the measured flow in actual volume or NM³/h?

 

Bobby

[sachico28]

The above is not quite correct. Is the measured flow in actual volume or NM³/h?

 

Bobby

 

hi bobby, 

 

our ultrasonic flow meter display says it's m3/hr but if it's Nm3/hr how should i compute this

[Bobby Strain]

Ask your instrument engineer. You are probably correct that it is m³ /h. You can get close by estimating the molecular weight. But you should have a composition to be accurate.

 

Bobby

[breizh]

Hi,

Did you check on Google? You will find Bobby's website and data from others.

key words: conversion of m3 of natural gas to m3 of lng

http://www.bobby-str...com/BSG_LNG.htm

Important is to get the composition of the NG to get the calculation right. 

I will use an EOS to support the calculation.

I've attached for reference the composition of NG at my place (Thailand), you should be able to get similar information from your supplier.

This could help you to do the math.

 

https://pmis.pipelin...V16&show=past7d

 

Based on your conditions (P,T) and gas composition above using Peng Robinson I got the result underneath:

 

NG 1000.00 m3/h LPG 78.68 m3/h

 

Is the ultrasonic technology the best one for this application?

My 2 cents .

Breizh