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Design Temperature Criteria For Shell & Tube Heat-exchanger?


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#1 bhaskaran

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Posted 22 December 2008 - 01:09 AM


I came across one shell & tube heat exchanger data-sheet recently which has the following specifications:-

Shell-side

Design pressure = 1.0 Kg/cm2

Design temperature = 170.c

Test pressure = 1.2 Kg/cm2

Above specifications all are as per ASME Section VIII Div.1

How the design temperature is fixed? Any specific guidelines or correlations available in ASME

Thanks in advance

Regards,
Bhaskaran.r


#2 Andrei

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Posted 22 December 2008 - 08:52 AM

Actually the design temperature is not defined by ASME Code but by process conditions. The equipment is built per ASME Code requirements.
Where I work the design temperature is defined by maximum normal operating temperature plus a design margin.


#3 JoeWong

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Posted 22 December 2008 - 09:54 AM

QUOTE (Andrei @ Dec 22 2008, 09:52 AM) <{POST_SNAPBACK}>
Actually the design temperature is not defined by ASME Code but by process conditions. The equipment is built per ASME Code requirements.
Where I work the design temperature is defined by maximum normal operating temperature plus a design margin.


Similar to the design pressure...

Just wonder the design pressure looks small. Wonder if this datasheet has gone through MECHANICAL design.


#4 sheiko

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Posted 03 January 2009 - 11:31 AM

QUOTE (bhaskaran @ Dec 22 2008, 07:09 AM) <{POST_SNAPBACK}>
I came across one shell & tube heat exchanger data-sheet recently which has the following specifications:-

Shell-side

Design pressure = 1.0 Kg/cm2

Design temperature = 170.c

Test pressure = 1.2 Kg/cm2

Above specifications all are as per ASME Section VIII Div.1

How the design temperature is fixed? Any specific guidelines or correlations available in ASME

Thanks in advance

Regards,
Bhaskaran.r


Hello,

I have noticed the test pressure is only 120% of design pressure.

Latest ASME states that the test pressure of an equipment has to be 130% of design pressure.
Earlier revision of ASME required that equipment and piping be tested at 150% of stated design pressure.

#5 ankur2061

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Posted 03 January 2009 - 11:58 AM

Bhaskaran,

I prepared a company standard titled 'Process Design Criteria' for a reputed middle east O&G company. I am reproducing a few lines about design temperature in general and DT for heat exchangers in particular from this standard:

quote:The DT (often referred to as the upper design temperature, UDT) is the highest temperature to which the equipment may be subjected to at the design pressure.

Where the maximum operating temperature can be ascertained accurately, this temperature should be used as design temperature, without adding a safety margin.

Where the maximum operating temperature cannot be ascertained accurately, the DT should be determined by adding 25°C to the NOT (Normal Operating Temperature).

For all heat exchangers, both sides shall have the same design temperature determined by the hottest of the fluids on either side.:unquote

Hope this helps.

Regards,
Ankur.






#6 Qalander (Chem)

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Posted 05 January 2009 - 02:33 AM

QUOTE (ankur2061 @ Jan 3 2009, 09:58 PM) <{POST_SNAPBACK}>
Bhaskaran,

I prepared a company standard titled 'Process Design Criteria' for a reputed middle east O&G company. I am reproducing a few lines about design temperature in general and DT for heat exchangers in particular from this standard:

quote:The DT (often referred to as the upper design temperature, UDT) is the highest temperature to which the equipment may be subjected to at the design pressure.

Where the maximum operating temperature can be ascertained accurately, this temperature should be used as design temperature, without adding a safety margin.

Where the maximum operating temperature cannot be ascertained accurately, the DT should be determined by adding 25°C to the NOT (Normal Operating Temperature).

For all heat exchangers, both sides shall have the same design temperature determined by the hottest of the fluids on either side.:unquote

Hope this helps.

Regards,
Ankur.


Dear ankur splendid! Very helping info indeed!
Regards
Qalander

#7 kuldeepd

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Posted 31 March 2009 - 03:56 AM

http://www.processca..._Exchanger.aspx

hope this helps.

regards
KD




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