3 replies to this topic

[rd20]

Hi all!

We have one newly installed propylene MLA in our product pier. It has both the liquid loading line and vapor return line. After propylene loading, the gas of the vapor line is vented using the vessel's venting system. On the other hand, the liquid fill of liquid line is pushed back to the sphere from shore using the vessel's compressor. The block valve in the pier is closed after the said activity. Line floating is then done again from propylene sphere to the pier block valve before taking final closing gauge of the sphere.

In order to eliminate pushing of the propylene liquid back to sphere, can we just install a tie-in connecting the vapor line to the liquid line? This will be used to push the propylene liquid from the liquid line to the vapor line back to the ship. what do you thick is the minimum size of the tie-in in order to avoid bubbling of the liquid propylene in the stand pipe of vapor line?

I have attached a photo of the setup described. I hope that you can help me.

VRL: 3" dia
Liquid Line: 8" dia

Thanks!

Attached Files

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[rd20]

does anyone know on how i can evaluate the required mass flow rate of vapor propylene to push the liquid propylene upward a 10' standpipe of 8" dia?

[ankur2061]

does anyone know on how i can evaluate the required mass flow rate of vapor propylene to push the liquid propylene upward a 10' standpipe of 8" dia?

rd20,

Can lay your hands on a company standard (Shell Design Engineering Practices) with the number and title

DEP 30.06.10.13-Gen. , 'LPG Bulk Transfer and Transportation'

It has comprehensive guidelines on sizing and calculation methods for loading arms and hose systems for LPG loading to bulk marine and road vessels.

Regards,
Ankur.

[rd20]

rd20,

Can lay your hands on a company standard (Shell Design Engineering Practices) with the number and title

DEP 30.06.10.13-Gen. , 'LPG Bulk Transfer and Transportation'

It has comprehensive guidelines on sizing and calculation methods for loading arms and hose systems for LPG loading to bulk marine and road vessels.

Regards,
Ankur.

Thanks Ankur. However, I still didn't find the answer to my problem. Any other ideas?