4 replies to this topic

[Windswept]

Hi,

I am new to this forum, can anyone point me in the right direction......?

I am trying to calculate the pressure surge of a fast closing valve to identify the pipe period in order to reduce the water hammer effect by increasing the flow stoppage rate. To do this I am using the Joukowski formula...... I have all the details I need but it has proven difficult to obtain the Bulk Modulus of elasticity of Liquid Natural Gas, LNG.


Does anyone know or know where I can find the Bulk modulus of elasticity of LNG?

Many Thanks

[breizh]

http://www.cheresour...-of-elasticity/

Consider this resource

Breizh

[ankur2061]

Windswept,

Refer the attachment for "Liquid Bulk Modulus" as a function of density and the liquid temperature.

Regards,
Ankur.

Attached Files

•  Liquid_Bulk_Modulus.xlsx   218.13KB   223 downloads

[Windswept]

Breizh,

Thank you for your reply, the thread was interesting although for LPG and not LNG.


Anuk,

The graph was a good indicator to quantify and value I finally managed to find,

This is what I found for interest or future reference: Bulk modulus of LNG 0.848 GPA @ -160 ºC

Many thanks

Windswept

[PaoloPemi]

(isothermal) bulk modulus is the inverse of isothermal compressibility,
if you know (or can characterize) the composition any software capable to calculate isothermal compressibility can give accurate results, differently a generic value is the last resource.
Some software for fluid flow analysys requires only one value for bulk modulus not a table, for these cases I prefer to calculate several values of isothermal compressibility with Prode Properties then I select an average value (in the expected range of pressures and temperatures)