7 replies to this topic

[Skyline]

Dear all,

I'm doing a simulation in a geothermal process. I use n-pentane as working fluid which is circulated within the process. But if the plant is to be shutdown, it means i have to store the n-pentane (in liquid form) in a storage tank, right? The problem is, how big the tank i need? What variable do i have to specified to get the tank volume needed? Thank you very much...

Best regards


Erwan

[shreyas]

Calculate volume of process piping/equipments where you are circulating process fluid.
Equipments holdup volume u can get from as-built drawings.
Piping volume can be calculated by having data of piping length and diameter.

This will give you total valoume of process liquid. Apply suitable margin on total calculated volume. Size the tank for this volume

For tak calculation, select L/D ratio...generally in the range of 1.1 to 1.5

Regards.
Shreyas

Dear all,

I'm doing a simulation in a geothermal process. I use n-pentane as working fluid which is circulated within the process. But if the plant is to be shutdown, it means i have to store the n-pentane (in liquid form) in a storage tank, right? The problem is, how big the tank i need? What variable do i have to specified to get the tank volume needed? Thank you very much...

Best regards


Erwan

[breizh]

Erwan ,
Pay attention if you have to reapatriate the chemical to the storage tank for safety reason (leak) or maintenance.
It happens !
regards

Breizh

[demank]

n-pentane for the design storage condition in what phase, vapor or liquid?
Beware about vaporizing the liquid.
I think you must decide the storage temperature & pressure first. (to prevent vaporizing)

[Skyline]

n-pentane for the design storage condition in what phase, vapor or liquid?
Beware about vaporizing the liquid.
I think you must decide the storage temperature & pressure first. (to prevent vaporizing)

Dear demank,

N-pentane we'd like to store is in liquid form, because we'll store it in ambient temperature n pressure. I checked the properties, and n-pentane at ambient temperature and pressure is in liquid form, so i think ambient condition is good enough.

After deciding temperature and pressure, what should i decide then? I got an idea that suggest me to decide the pipe length and equipment hold-up so i can decide the volume. I do really think that's a good idea, but the problem is, i don't know the estimation of the pipe length...It's a grass root plant we're about to build...Any idea?
Thank you very much...


Best regards,



Erwan

[xtianchem]

n-pentane for the design storage condition in what phase, vapor or liquid?
Beware about vaporizing the liquid.
I think you must decide the storage temperature & pressure first. (to prevent vaporizing)

Dear demank,

N-pentane we'd like to store is in liquid form, because we'll store it in ambient temperature n pressure. I checked the properties, and n-pentane at ambient temperature and pressure is in liquid form, so i think ambient condition is good enough.

After deciding temperature and pressure, what should i decide then? I got an idea that suggest me to decide the pipe length and equipment hold-up so i can decide the volume. I do really think that's a good idea, but the problem is, i don't know the estimation of the pipe length...It's a grass root plant we're about to build...Any idea?
Thank you very much...


Best regards,



Erwan

hello
i think that firstable you should know how much will you produce or use n-pentane because we begin a project in this way ,try to use a software simulation like chemcad and you can enter information about caudal(m3/h) or T or P then you can sizing this vessel and you can see the values that the software suggest you then you decide...what is the best volume.

best regards

Xtian

[Steve McGahey]

Calculate volume of process piping/equipments where you are circulating process fluid.
Equipments holdup volume u can get from as-built drawings.
Piping volume can be calculated by having data of piping length and diameter.

This will give you total valoume of process liquid. Apply suitable margin on total calculated volume. Size the tank for this volume

For tak calculation, select L/D ratio...generally in the range of 1.1 to 1.5

Regards.
Shreyas

Dear all,

I'm doing a simulation in a geothermal process. I use n-pentane as working fluid which is circulated within the process. But if the plant is to be shutdown, it means i have to store the n-pentane (in liquid form) in a storage tank, right? The problem is, how big the tank i need? What variable do i have to specified to get the tank volume needed? Thank you very much...

Best regards


Erwan

If it's an in-line storage vessel, don't forget to account for thermal expansion.

[AZIZ_MN]

hi, ur question is not clear, how u r circulating n-pentene through pump or thermosyphoning ?,if u r using pump then u should
have compansator(buffer vessel) with certaian pressure,first u should calculate total volume of circulating n- pentene including
buffer vessel so at least that much volume u could able to store in tank and tank capacity should be surplus than total volume u have
temprature and pressure of tank is depends upon ur cercuating fluid temp and pressure if n-pentene is highly volatile then u need to
store it under pressure then u can think of having sphere tank, tank temp. press. and safety to be cosider ( i.e. if tank safety valve
blowoff than how much amount of gas will release to vent collecting system,u r vent collecting system should accomodate that much amount
of blowoff gas