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dummy or spacer tubes use?

dummy or spacer tubes use?

dummy or spacer tubes use?

(OP)
I am repairing a tube leak and ended up having some of the dummy or spacer tubes removed in our reheat section.  I was woundering why are they there is it to support the bundle or to reduce convection.  Any help would be of benifit.
Thanks

RE: dummy or spacer tubes use?

sometimes there is installed a squashed tube to maintain spacing between elements and also to reduce vibration potential.

Also, if there is found to be a lot of steam in the fluegas after you restart, it probably was not a dummy tube that you removed.

RE: dummy or spacer tubes use?

Dummy tube and I assume these are not connected to the reheat tube circuit are in place to maintain tube spacing to keep a uniform flue gas flow over the tube bank. Removal may cause a problem with poor performance of the boiler if the reheat tubes become miss aligned.

rjoaks

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