Posted by JohnT on January 04, 2000 at 07:35:26:
I posted a message last month asking opinion about correct nozzle size for my 30-years-old steam boiler.
What happened that plumber who serviced boiler back in October installed 1.25 GPH nozzle on the boiler
(boiler spec said that it can go up to 1.3) As a result, firing rate was so high that pressuretrol was cycling
boiler every 5 minutes.
Previous house owner mentioned that he never installed nozzle larger than 0.7 GPH. Your replies also
confirmed that installing smaller nozzle is one of the approaches to control load of the old boiler.
I called plumber back to change the nozzle to a smaller size, but he simply refused to put nozzle smaller than 1.0 GPH.
When I mentioned about replies I got on this BB, he just laughed out saying that he never heard anything
Is he just trying to cover his butt by installing larger than needed nozzle to avoid yet another call in case
that boiler will not produce enough steam? Is there a way to figure out correct size of nozzle short of
changing it and see what happens?
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