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Relief Valve At Plate And Frame Heat Exchanger


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#1 daniwibowo8

daniwibowo8

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Posted 29 June 2016 - 05:35 AM

Dear Honorable Member,

 

We have Shell and tube heat exchanger named E-201-11. This E-201-11 is exchanger just before pass heater of furnace of CDU. The service fluid is desalted crude (shell) and vacuum residue (tube) from bottom column.

Shell operating pressure is 19.7 kg/cm2 and tube operating pressere is 25.8 kg/cm2.

Pressure desain shell 30 kg/cm2 and pressure desain tube 36 kg/cm2.

Hydrotest pressure shell 43.5 and tube 37.5 kg/cm2.

 

What the main consideration of installing TSV at outlet of desalted crude?

 

Now, we are installing spare exchanger for E-201-11 but the type is plate and frame HE.

The operation mode will be one HE operated and one HE spare/stadby.

 

My question is : Do we need to install relief valve at desalted crude outlet of new HE?

 

Regards

DW



#2 fallah

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Posted 29 June 2016 - 11:53 AM

DW,

 

The TSV will be installed to releave the overpressure due to thermal expansion of desalted crude...

 

If at any time only one HE is in operation, it's allowed using one common TSV for both HE's...



#3 daniwibowo8

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Posted 29 June 2016 - 02:47 PM

Dear Mr. Fallah,

 

Thank you for your answer.

What may cause thermal expansion of desalted crude?

Is this because the hot fluid a reduced crude stream which directly from bottom CDU's column? (Stream reduced crude: Bottom CDU--> Pump---> E-201-11 ---> E-201-08AB ---> E-201-04AB)

When a open again the P&ID i saw 4 other HE's which using reduced crude as hot stream (all in crude prerheat), those HE's also using TSV.

 

Regards

DW



#4 fallah

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Posted 29 June 2016 - 10:12 PM

 

When a open again the P&ID i saw 4 other HE's which using reduced crude as hot stream (all in crude prerheat), those HE's also using TSV.

 

 

DW,

 

Please upload the P&ID to get more proper and accurate response...
 



#5 daniwibowo8

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Posted 30 June 2016 - 10:28 PM

Dear Mr Fallah
 
PID as attached  for E-201-11/08/04.
As you said before, we able to use one TSV for two exhanger.
For that scenario, we will make line from desalted crude TSV tapping point to existing suction TSV.
Could you advise any reference regarding one TSV for 2 HE's?

Attached File  img-160701102237-0001.jpg   208.1KB   4 downloads
Attached File  img-160701102237-0002.jpg   171.62KB   3 downloads
Attached File  img-160701102237-0003.jpg   220.24KB   3 downloads

Highly apprecieate for your reply.

#6 daniwibowo8

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Posted 04 July 2016 - 02:20 AM

 

 

When a open again the P&ID i saw 4 other HE's which using reduced crude as hot stream (all in crude prerheat), those HE's also using TSV.

 

 

DW,

 

Please upload the P&ID to get more proper and accurate response...
 

 

Dear Mr Fallah,

 

PID as attached.

 

thx\

DW






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