13 replies to this topic

[sandesh4717]

Dear all,

 

i am working on the  sizing of the PSV for limpet coil or jacket of the reactor , i am aware of the sizing of the PSV present on the reactor nozzle ,

 

your valuable inputs are needed for approach of sizing  of PSV for the limpet or jacketed coil  since i am not fully aware of this sizing,

 

where can i get the methodology for sizing of the PSV for the limpet or jacket 

 

details available are -

 

reactor is used for emulsion + polymer 

DP & T  of jacket are - 5kg/cm^2 & 150 deg c 

DP & T of shell are  -  k kg/cm^2 & 150 deg c 

 

your valuable inputs are needed  

[fallah]

 

details available are -

 

reactor is used for emulsion + polymer 

DP & T  of jacket are - 5kg/cm^2 & 150 deg c 

DP & T of shell are  -  k kg/cm^2 & 150 deg c 

 

your valuable inputs are needed  

 

PSV sizing for which case? Fire case?

 

K value hasn't been specified...

[sandesh4717]

 

 

details available are -

 

reactor is used for emulsion + polymer 

DP & T  of jacket are - 5kg/cm^2 & 150 deg c 

DP & T of shell are  -  k kg/cm^2 & 150 deg c 

 

your valuable inputs are needed  

 

PSV sizing for which case? Fire case?

 

K value hasn't been specified...

 

Sorry for the incomplete details

 

K value is 3 kg/cm^2 

 and yes it is to be designed for Fire case 

[breizh]

Hi ,

I don't understand what you are asking , if you are familiar with PSV sizing you should know that the 1rst  step to be considered is to define the scenario . Only you or someone from your organization can decide .

 

my 2 cents

Breizh 

 

 

 

 

[sandesh4717]

Thanks berizh,

 

actually i want to size the PSV  for Jacket of the reactor, what should be approach on this and where can i get the literature for sizing this ,

 

your valuable advice is needed 

[breizh]

Hi,

You already have the necessary literature to size a PSV , the key as fallah  stated is to define the scenario .(fire , lack of utility ,....)

Consider the link attached :

https://www.aiche.or.../20131068_r.pdf

 

other references you should consider :

 

Chemical process safety by Daniel A CROWL and Joseph F LOUVAR 

 

The safety relief valve handbook by Mark HELLEMANS

 

https://www.leser.co...ls/engineering/

 

(you can download a copy of the engineering manual) 

 

Breizh  

[fallah]

 

 

 

 

PSV sizing for which case? Fire case?

 

K value hasn't been specified...

 

Sorry for the incomplete details

 

K value is 3 kg/cm^2 

 and yes it is to be designed for Fire case 

 

 

Please specify the exact content of the reactor jacket...(steam? water?...)

[sandesh4717]

 

 

 

 

 

PSV sizing for which case? Fire case?

 

K value hasn't been specified...

 

Sorry for the incomplete details

 

K value is 3 kg/cm^2 

 and yes it is to be designed for Fire case 

 

 

Please specify the exact content of the reactor jacket...(steam? water?...)

 

 

is is water jacketed reactor 

[sonu19921103]

Hi Sandesh,

 

I am assuming its a batch reactor we are talking about.

 

The Reactor Utility Header PSV (protects reactor Jacket) are usually sized for Hydraulic Expansion & Fire (CWS trapped in jacket while process is exothermic; this will heat the jacket side and will lead to pressurization).

 

Best Regards

Sonu Singh

[sandesh4717]

Hi Sandesh,

 

I am assuming its a batch reactor we are talking about.

 

The Reactor Utility Header PSV (protects reactor Jacket) are usually sized for Hydraulic Expansion & Fire (CWS trapped in jacket while process is exothermic; this will heat the jacket side and will lead to pressurization).

 

Best Regards

Sonu Singh

Thanks sonu for the clarity, yes it is batch reactor   the PSV are present on the reactor jacket hydraulic expansion will use TSV correct? and for fire the PSV?

 

Sandesh

[latexman]

The Reactor Utility Header PSV (protects reactor Jacket) are usually sized for Hydraulic Expansion & Fire (CWS trapped in jacket while process is exothermic; this will heat the jacket side and will lead to pressurization).

In general, my industrial experience is, headers (i.e. pipe) are not protected with relief devices.  Certainly not for fire, and certainly not cooling water headers.  If your company is doing this, it is not typical.  You sure about this?

 

Equipment (vessels, tanks, heat exchangers (including the CW side), etc.) are protected.  Pipe that can be blocked in and have thermal expansion are protected, but that is a small fraction of the miles and miles of pipe out there.  I don't think I have ever seen a CW header with a relief, not counting reliefs on CW side of equipment.

[latexman]

Sandesh,

 

Did you size or are familiar with a fire scenario for shell side of RX?  It sounds like you did/are; "i am aware of the sizing of the PSV present on the reactor nozzle".  If so, I do not understand why you cannot do the same for jacket side of RX.  They are somewhat similar.

[sandesh4717]

Sandesh,

 

Did you size or are familiar with a fire scenario for shell side of RX?  It sounds like you did/are; "i am aware of the sizing of the PSV present on the reactor nozzle".  If so, I do not understand why you cannot do the same for jacket side of RX.  They are somewhat similar.

Thanks Latexman for your inputs , i was confused whether the methodology is similar or is there any other approach for sizing it for limpets or jackets. The existing size of the PSV on the jacket or limpet is 20*25 so i was instate of mind it is TSV.

[sonu19921103]

 

The Reactor Utility Header PSV (protects reactor Jacket) are usually sized for Hydraulic Expansion & Fire (CWS trapped in jacket while process is exothermic; this will heat the jacket side and will lead to pressurization).

In general, my industrial experience is, headers (i.e. pipe) are not protected with relief devices.  Certainly not for fire, and certainly not cooling water headers.  If your company is doing this, it is not typical.  You sure about this?

 

Equipment (vessels, tanks, heat exchangers (including the CW side), etc.) are protected.  Pipe that can be blocked in and have thermal expansion are protected, but that is a small fraction of the miles and miles of pipe out there.  I don't think I have ever seen a CW header with a relief, not counting reliefs on CW side of equipment.

 

Hi Latexman,

 

My apologies i think my choice of word made it little confusing there. The TRV to protect the Reactor jacket is usually present on the utility return line 9not header). Its there to protect reactor jacket not utility header.

 

I agree with the observations made by you.

 

Best Regards

Sonu Singh