10Engineering knowledge
Articles for engineers and plant teams
Plain-language guides to industrial ventilation and air pollution control, from hoods, ducts, fans and stacks to scrubbers and carbon adsorbers.
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Regulations
Environmental regulations and agencies in Thailand
Official links to the agencies, online systems, laws and factory air emission standards that Thai plants use most, in one place.
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Ventilation
Factory ventilation: capture at the source, or dilute the whole room?
Capture at the source or dilute the whole room? The five parts of an exhaust system, and how to choose the right approach for your plant.
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Hoods
Capture hoods: double the distance and you need almost four times the airflow
Move a hood from 30 to 60 cm and it needs almost four times the airflow. Plus two almost cost-free ways to cut the airflow you need.
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Ductwork
Duct velocity: too slow and dust settles, too fast and power is wasted
Duct velocity has to be just right. Too slow and dust settles, too fast and you pay for it in power. With a velocity table by dust type and a worked example.
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Ductwork
7 ductwork details that decide whether a system pulls well or not at all
Elbows, branch entries, blast gates and cleanouts: seven small details that decide whether a system pulls well or barely pulls at all.
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Fans
Air pressure and fans: read the numbers before you order a fan
20% more airflow takes about 73% more fan power. Understand SP, VP and FSP, and correct for hot air before you order a fan.
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Stacks
Discharge stacks: once it’s out, keep it out
Why odours drift back into buildings, the right stack height and velocity, and why rain caps should be avoided.
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Wet Scrubber
What is a wet scrubber, how does it work, and which pollutants does it suit?
How a wet scrubber uses water to capture dust and gases, the common types, and the pollutants each one suits.
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Choosing a system
Wet scrubber or activated carbon? Choose by the pollutant
Wet scrubber or activated carbon? A comparison by pollutant type, and why some plants need both.
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Activated Carbon
How activated carbon adsorbs vapours, and when to replace it
Carbon can saturate without any warning. Understand breakthrough, and how to set a change-out schedule from real data.
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