Faqs
1 . What are the factors affecting corrosion ?
- Deposits on the metal
- Temperature
- Oxygen concentration
- pH
- Suspended solids
- Dissolved solids & gases
- Flow rate of water
2 . What are the types of cooling water systems?
- Once Through Cooling Systems
- Closed Recirculating Cooling Systems
- Open Recirculating Cooling Systems
- Cooling Ponds & Sump
- Natural Draft Cooling Towers
- Mechanical Draft Cooling Towers
3 . What are the factors favoring microbial growth in cooling systems?
- Water
- pH
- Nutrients
- Temperature
4 . How to calculate following in cooling systems?
- Makeup rate(m3/hr) = Evaporation+Bleed+Windage loss
- Evaporation loss(m3/hr) = Recirculation rate (m3/hr) X Delta T (C) / 675
- Bleed off (m3/hr) = Evaporation(m3/hr) /COC-1
5 . How to calculate corrosion rate in cooling systems?
22.3 x Weight Loss in mg
Penetration in mpy = ——————————————–
D X A X T
Where:
D = Sp. Gravity (gm/cm3)
Admiralty brass 8.17
Copper 8.9
Yellow brass 8.02
Aluminum 2.70
Carbon Steel 7.85
A = Area of Coupon (Sq. Inches)
T = Times in days
6 . How to calculate Blowdown % in Boiler?
