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Heat Exchanger Pressure Design For Tube Rupture

tube rupture pressure design heat exchanger

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#1 alekso

alekso

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Posted 10 March 2019 - 04:47 PM

Dear All,

 

When you have an heat exchanger shell&tube, normally you have to take into consideration a tube rupture scenario. Codes allow to avoid installation of PSV for tube rupture if the Low pressure side of the heat exchanger has a pressure design of at least 10/13 of the pressure design of the high pressure side. 

 

In some engineering company designs I note that sometimes, when operating pressure of LP (low pressure) side is considerably lower than HP operating pressure, the pressure design of heat exchanger LP side is increased up to 10/13 of HP design pressure, but not the pressure design of connected systems upstream and downstream the heat exchangers.

 

Is there any reason for doing this? In my understanding this doesn't avoid the installation of a PSV for tube rupture to protect equipment connected to heat exchanger and, moreover, increases without apparent advantage the cost of  an heat exchanger .

 

Thank you



#2 Bobby Strain

Bobby Strain

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Posted 10 March 2019 - 10:37 PM

The ASME code states that a PSV is not required to protect the low pressure side from tube rupture if the test pressure of the low pressure side is at least equal to the design pressure of the high pressure side. You won't see anything like 10/13. As to connected equipment, the designer is to follow piping codes or other codes applicable to the equipment. Systems such as those for liquid heating media are a challenge.

 

Bobby






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