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During boiler operation, blowdown is mandatory to remove sludge, scale, and suspended solids from the water. If not properly handled, hot blowdown water can:

  • Kill microorganisms in wastewater treatment systems, severely impacting the environment.

  • Cause serious danger to operators due to high temperature and pressure.

The safe solution is to use a Blowdown System.

Currently, there are two common types:

  • Blowdown Separator (with cold water injection)

  • Blowdown Tank (self-cooling, for high pressure)

1. Blowdown Separator (Low-Pressure Type with Cold Water Injection)

Working Principle

  • Flash steam is released through a steam outlet pipe.

  • Remaining hot water is cooled by injecting cold water.

Advantages

  • Compact size.

  • Low initial investment cost.

  • Easy installation for low-pressure systems.

Disadvantages

  • Depends on a stable cold water supply.

  • Requires temperature control valves to maintain discharge water below 60°C.

  • Not suitable for high-pressure boilers or multi-boiler systems.

2. Blowdown Tank (High-Pressure Type)

Working Principle

  • Designed as a sealed tank with large volume.

  • Remaining water from the previous blowdown cools down and is used to cool the next discharge.

  • No continuous cold water supply is required.

Advantages

  • Safe for high-pressure operation (designed according to ASME Section VIII).

  • Independent from external cooling water.

  • Long service life and suitable for multiple boilers.

Disadvantages

  • Larger size and heavier weight.

  • Higher investment cost.

3. Comparison Between Blowdown Separator & Blowdown Tank

Criteria Blowdown Separator (Low Pressure) Blowdown Tank (High Pressure)
Cooling method Cold water injection Self-cooling from stored water
Volume Small Large
Applicable pressure Low – Medium High
Safety level Depends on cold water High & stable
Cost Lower Higher
Application Small plants, low discharge Large plants, multiple boilers

4. High-Pressure Blowdown Tank Specifications

Model Outside Diameter (DN) Shell Length (mm) Overall Height (mm) Blowdown Volume (L) Operating Weight (kg) Weight with Water (kg) Shipping Weight (kg) Maximum Allowable Pressure (bar)
BDT1648 DN400 1220 1910 79 277 435 197 10,3
BDT1860 DN450 1530 2240 136 404 540 268 10,3
BDT1872 DN450 1830 2440 151 450 602 299 10,3
BDT2448 DN600 1220 1980 204 528 733 324 10,3
BDT2460 DN600 1530 2290 246 612 859 367 10,3
BDT2472 DN600 1830 2490 288 699 983 411 10,3
BDT3060 DN750 1530 2340 401 900 1300 522 10,3
BDT3072 DN750 1830 2640 469 1022 1419 612 10,3
BDT3672 DN900 1830 2720 693 1379 2071 721 10,3
BDT4260 DN1050 1530 2490 840 1579 2419 748 10,3

5. Conclusion

  • For low-pressure boilers, Blowdown Separator is a cost-effective choice.

  • For high-pressure boilers, multiple boilers or maximum safety requirements, Blowdown Tank is strongly recommended.

DIVI Group, with more than 15 years of experience in manufacturing and operating industrial boilers, commits to:

  • Design compliant with ASME & TCVN standards

  • 5-year warranty

  • Safe – cost-effective – environmentally compliant solutions

Hotline/Zalo: +84 942 488 818 (Mr. Hieu)

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