Balance of Plant (BOP)

Balance of plant is everything a boiler needs in order to be a working boiler house rather than a delivered machine. It is the least glamorous line on a project and routinely the one that decides whether commissioning happens on schedule, because the boiler arrives finished and the rest has to be designed, fabricated and erected around it, on site, in the right order.

On the water side, treatment comes before anything else. Poor feed water is the single biggest cause of scaling, corrosion and carryover, and each of those is a slow, expensive failure of equipment that was fine when it arrived. A softener removes hardness, demineralisation and reverse osmosis go further where the pressure or the process demands it, and a deaerator strips dissolved oxygen before it reaches the drum. The right combination depends on your raw water analysis, not on a standard package.

On the gas side, the flue path has to carry hot, often abrasive gas from the furnace to the stack without wasting heat or destroying itself. That means ducting sized for the draught the ID fan can produce, refractory lining where temperatures would otherwise attack the steel, insulation on surfaces that would otherwise radiate purchased heat into the boiler house, and a chimney built to the height and construction the pollution control board requires.

Then there is the steam side and the structure holding all of it: IBR and non-IBR pipework with the material certification and inspection the regulations require, pressure vessels, boiler auxiliaries, dual fuel burners, economisers recovering heat from the flue gas, and the platforms, supports and bridge girders that carry the load.

We take this as one scope for a specific reason. Splitting responsibility between the boiler manufacturer, an erector and a piping contractor is where commissioning delays come from — each party's work is complete by its own definition and the gaps between them belong to nobody. Send us the boiler rating, your raw water analysis and the site layout, and we will quote the balance of plant as a single accountable package.