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WHAT IS THE DIFFERENCE BETWEEN A HEAT EXCHANGER MADE UNDER ASME VIII DIV 1 AND ONE MADE WITH TEMA C STANDARDS WHEN USING HIGH TEMP HOT WATER AT 400 PSI @ 450 DEGREES F. ?
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Heat Exchangers
Started by pocdnoc, Nov 15 2003 05:20 PM
2 replies to this topic
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#2
Guest_Guest_*
Guest_Guest_*
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Posted 21 November 2003 - 07:56 PM
Well, I'm no expert on this, but from what limited reading I've done, TEMA basically does research for the design of shell and tube heat exchangers, and have their own quality controls for allowing a manufacturer to manufacture to TEMA.
I would interpret ASME as being the 'law', to which even TEMA standards must conform.
TEMA produce design software; I'd imagine that a manufacturer who produces heat exchangers to ASME VIII may use whatever software they are familiar with, whereas TEMA suppliers may be designing using TEMA software.
Sorry this is all I can contribute, I just don't know enough about TEMA. Perhaps you could contact the manufacturer concerned, or perhaps even TEMA? Email for TEMA is tema@tema.org, other details are:
25 North Broadway Tarrytown, NY 10591, USA
TEL:(914) 332-0040 FAX:(914) 332-1541
I would interpret ASME as being the 'law', to which even TEMA standards must conform.
TEMA produce design software; I'd imagine that a manufacturer who produces heat exchangers to ASME VIII may use whatever software they are familiar with, whereas TEMA suppliers may be designing using TEMA software.
Sorry this is all I can contribute, I just don't know enough about TEMA. Perhaps you could contact the manufacturer concerned, or perhaps even TEMA? Email for TEMA is tema@tema.org, other details are:
25 North Broadway Tarrytown, NY 10591, USA
TEL:(914) 332-0040 FAX:(914) 332-1541
#3
Guest_Guest_ShaunHill_*
Guest_Guest_ShaunHill_*
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Posted 03 December 2003 - 04:08 PM
TEMA standards outline the standard design of shell and tube heat exchangers.
They provide standard types of tube sheet designs, tube layouts, and guidance on thermal design.
They also include references to standard fouling coefficients.
There is guidence on construction methods of joining tubes to tube sheets and stuff like that.
The TEMA C class has less stringent construction than the "R" class.
If your heat exchanger is also a registered pressure vessel it must also conform to ASME VIII. This will provide the basis of mechanical design to ensure that the exchanger can operate at the specified design pressures.
Of note: your tube side and shell shide may have different design pressures. In this case, you should have a PSV on the low pressure side (usually the shell) that can at least handle a tube rupture case.
They provide standard types of tube sheet designs, tube layouts, and guidance on thermal design.
They also include references to standard fouling coefficients.
There is guidence on construction methods of joining tubes to tube sheets and stuff like that.
The TEMA C class has less stringent construction than the "R" class.
If your heat exchanger is also a registered pressure vessel it must also conform to ASME VIII. This will provide the basis of mechanical design to ensure that the exchanger can operate at the specified design pressures.
Of note: your tube side and shell shide may have different design pressures. In this case, you should have a PSV on the low pressure side (usually the shell) that can at least handle a tube rupture case.
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