Posted by Ron on November 07, 2001 at 18:45:42:
In Reply to: Re: PITTING ON TUBES posted by Ron on November 07, 2001 at 18:42:41:
: : JUST OPENED A BOILER THAT WAS FULL OF WATER ,IT HAD BEEN IDLE FOR 1 1/2YEARS HAD BEEN TOLD IT HAD BEEN RETUBED 1YEAR EARLIER ,NOW IT HAS PITTING ON THE TUBES ,RESULTING IN TUBE LEAKS ,POOR LAYUP TO BE THE BLAME ? NEED SOME CURES TO THIS SITUATION AS IT IS GOING TO BE DIFFICULT TO DEAL WITH THANKS
When we lay up our boilers, we keep them pressurized with 175# steam, with the condensate removed through steam traps on the open blow down lines. We can recover the condensate that way. When laying up the boilers, we open the drum vent until we get about 50# pressure to remove the air, since oxygen causes the pitting.