Heat Exchanger Re-tubing

[Raza Rauf]

Due to Re-tubing overall length of the exchanger will be reduced by 20mm, in order to compensate this tube sheet is of 38mm thickness instead of 28mm.

Please explain the effect of Heat exchanger design by this change and any evaluation is required. Can the increase in tubesheet thickness have any negative impact?

 

[r6155]

Remember - More details = better answers (said by LittleInch)

Regards

 

[0707]

the impact would be imperceptible, but what r6155 said is true.

luis

 

[SnTMan]

Sort of depends on how much of the total surface you are losing. Many tubes, little loss. Few tubes greater loss. Re-tubing is usually done with tubes of the same dimensions. What happened?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

Is this a re-tubing or a new bundle?

Regards

 

[EdStainless]

The original tubesheets must be shot also.
Maybe someone messed up and ordered tubes that were too short?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[r6155]

If the tubesheet thickness is increased by 10 mm, the channel side nozzles will also shift, as will the length of the bolts.

Regards

 

[Christine74]

When you say the Overall length will be reduced by 20mm you probably mean that the Effective length will be reduced by 20mm, i.e. your effective heat transfer area will decrease slightly.

Unless the tubes are very short (say under ~200mm) in length this will have very little impact on the thermal performance.


-Christine