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lowering steam pressure in a industrial building
Facility was built back in the 1930,originally they had two coal B&W 60K LB/H boilers, time went by and like many others they outsourced part of the production and the steam load was reduced to a mere 20K to 30K LB/H, the coal boilers were scrapped, main pressure dropped from 150pisg to 90psig, now they are planning on cutting steam demand by getting rid of all steam driven production equipment and using the steam for space heating only, currently the steam travels about quarter of a mile from the powerhouse to AHU on the roof and perimeter wall radiation, there are several PRV reducing pressure from 90psi (main) to 12psi to loads. They want to drop main pressure to 12 psi, my first concern was the feed water pumps working outside the curb and the main was sized for high pressure may be too big for the low pressure steam turning it into water before it reach its destination. I would like to know what you guys think before advising the customer against it or perhaps it maybe a good idea and I just dont get the whole picture. thanks!