Hi,Our factory has below requirement; we consume about 225kg-250kg (500lbs-550lbs) of steam every hour. This is Continuous usage, and there will be no up and downs (No USE of accumulator). So please recommend me Ideal size Steam boiler. The standard sizes available in our market are 300KG (660lbs), 400KG (880lbs) and 500KG (1100lbs). And we can custom order 350KG (770lbs) or 450KG (990lbs) if absolutely required.
Sounds like the 300kg boiler will be adequate. Remember most boilers control their burner systems based on the required pressure. That kind of control would let a 300 kg boiler cover the 225 to 350 kg range. The only reason to consider a larger boiler has to do with how conservatively the boiler manufacturers rate their equipment. I have seen some boilers that really can't meet their rated capacity on a continuous basis.
Talk to vendors and have them propose various options. Recognize that you will lose some heat, and get an estimate of losses [ie, heat losses from steam lines], before deciding what size. Also, you may do well to examine the tradeoffs between insulation cost, fuel cost, and boiler capital cost. However, think hard on what if any future business expansion you might have. It is hard to expand a boiler.... Also, it is possible that where you are the regulations vary with boiler size. Various States [in the USA] at least used to have different rules as to what size boiler required what regulation and training. For this reason the boiler manufacturers would produce boilers modified to be just below a regulatory jump, ie, the Ohio Special which had a couple of tubes plugged off, to be just below the heat transfer area that would trigger a regulatory jump, so that the plant could get the maximum boiler size for a given level of regulatory compliance [ie, operator training, record keeping, etc].
