Design Pressure: Atmospheric + 5 psi (non-pressurized vessel)
Design Temperature: 100 – 120 °C (after cooling discharge ≤ 60 °C)
Blowdown Inlet Pressure: As per boiler operating pressure (10 – 30 bar)
Tank Capacity: 200 liters – 2000 liters (depends on boiler size)
Outlet: Drain line to sewer + vent for flash steam
Shell: Cylindrical vessel made of heavy-duty mild steel or carbon steel.
Designed as per ASME Sec VIII Div 1 standards.
Inlet Nozzle: Connected to boiler blowdown line.
Equipped with high-pressure flange.
Vent Connection: Safely releases flash steam to the atmosphere.
Outlet Drain: Discharges cooled water into the drain system.
Shell Material: Mild Steel (MS) – standard
Carbon Steel SA 516 Gr. 70 – for higher durability
Nozzles & Flanges: ASTM A105 / A106 grade
Insulation (Optional): Mineral wool with aluminum cladding
Internal Coating: Epoxy or anti-corrosive lining
External Coating: Heat-resistant paint for durability
A Blowdown Tank is a non-pressurized vessel designed to receive hot, high-pressure boiler blowdown water and safely reduce its pressure and temperature. It separates flash steam, cools the water through dilution, and discharges it at a safe temperature into the drain system.
As part of a complete boiler system, the Blowdown Tank works in combination with other essential accessories such as:
Feed Water Tank / Deaerator – for preheating and oxygen removal
Water Softener / RO Plant – for hardness and TDS control
Economizer – for heat recovery from flue gases
Chimney / Stack – for safe emission of flue gases
Safety Valves & Controls – for boiler protection
This integration ensures smooth, efficient, and safe boiler operation.
