5 replies to this topic

[vinay]

Hi All,

Can some one guide me on how to carry out the sizing of Liquid Liquid separator when there is a coalescing media present in the separator ?

Lot of information is available on gravity settlers but little very info is available on the vessel size calculation when a coalescing media/screen/mesh pad is used.

Regards,
Vinay Mathur

[jetul]

Vinay,..

U may size ur drum by considering 0.015 m/s of velocity of liquid phase. (for coaleser pad)

pls. follow the guideline of terminal velocity of heavy and light phase partical to float light particles in heavy phase and settle down heavy particles in light phase.

hope this will work.
thanks

[vinay]

Dear Jetul,

UOP guidelines are 3 ft/sec (~ 0.91 mt/sec) velocity across mesh pad/coalescer. Your number seems to be too low . Can you please specify the source of your recommendation ?

Regards,
Vinay

[jetul]

Dear Vinay,

As Per Shell guide line,

1) The C/S of the mat shll be sufficiently large to limit the average velocity of the total liquid flow to at most 1.5 cm/s, i.e. 0.015 m/s.

2) If small amount of heavy phase is present and the "de-oiling" of it is not critical, then it is not necessary to maintain and interface level in the vessel and a boot can be used.

pls. refer attached mail for reference....

thanks

Attached Files

•  LL_separator.xls   18.5KB   1064 downloads
•  LL_separator.xls   18.5KB   679 downloads

[vinay]

Dear Jetul,

Thank you very much for you kind help.

Regards,
Vinay

[Lucas]

Vinay,

See API 12J - Specification for Oil and Gas Separators - Appendix C, for vessel with wire mesh.


Lucas