8 replies to this topic

[RadjaT]

I have a project that I'm asked to analyze usage the bottom outlets of the tank for LNG removal (no membrane tanks, for medium- and large scale of storage). I can't find any researches, projects with this option of off-load from the tank, or reasons why this is not used. So I'm asking for help with the search and explanation. Thanks

[Pilesar]

An internet search for 'safety lng unloading' seems to give a viable path for searching. In your analysis, consider the consequences of a tank bottom connection failure.

[RadjaT]

Would you be able to give a link (if allowed by the rules of forum) to a good resource in your opinion? Also, maybe you could briefly describe the consequences of a tank bottom connection failure.

[fallah]

I have a project that I'm asked to analyze usage the bottom outlets of the tank for LNG removal (no membrane tanks, for medium- and large scale of storage). I can't find any researches, projects with this option of off-load from the tank, or reasons why this is not used. So I'm asking for help with the search and explanation. Thanks

 

One reason why bottom outlet of LNG tanks not being used is avoiding the LNG leakage to outside following to the pumps seal failure while in using submersible pump for unloading from the top there would be no leakage to outside due to the pump seal, or other parts of the pump, failure...

[RadjaT]

Hello, fallah! I'm glad to see you. I accidentally found a topic on a close topic where you participated, and because decided to write on this forum.

Your opinion is similar to what is written in EN 14620-1:2006 paragraph 7.1.6. Do I understand correctly that if bottom outlet is used, the pumps are also submersible? The presence of a valve is not able to solve the problem of leakages?

[fallah]

Hello, fallah! I'm glad to see you. I accidentally found a topic on a close topic where you participated, and because decided to write on this forum.

Your opinion is similar to what is written in EN 14620-1:2006 paragraph 7.1.6. Do I understand correctly that if bottom outlet is used, the pumps are also submersible? The presence of a valve is not able to solve the problem of leakages?

 

Hello, Radja,

 

I'm glad to see you here, too.

In fact, in bottom outlet the pumps are placed outside hence cannot be submersible. The presence of a valve at the pumps suction and as close as possible to the tank's outlet nozzle, in the form of an on/off shut down valve which could be closed remotely, can help to prevent loss of inventory in the case of pump seal or pump itself failure...

[RadjaT]

Why are we forced to place the pumps outside the storage facility in this case? Because of the difficulty of replacing them?

[Bobby Strain]

No one forced you to place the pumps outside the tank.

 

Bobby

[fallah]

Why are we forced to place the pumps outside the storage facility in this case? Because of the difficulty of replacing them?

 

You aren't forced at all to place the pumps outside otherwise when submersible pump provision isn't possible...