Cooling/Boiler Water (week 13)

Water chemistry must be kept within specific parameters as recommended by manufacturers.

• True

• False

Out-of-limit-parameters can lead to:

• Scaling and fouling that reduce heat transfer efficiency

• Increased lifespan of equipment and reduced maintenance cost

• Foaming and priming in boilers

• Foaming and priming in boilers

Test Parameter: Total Dissolved Solids (TDS)

Problem (if out of range): High → Risk of scaling, carryover

Action/Adjustment: _________

 

• Increase oxygen scavenger dosing

• Adjust phosphate dosing (depending on boiler design).

• Increase blowdown frequency.

• Add alkalinity booster chemicals.

Test Parameter: ________

Problem (if out of range): Low → Corrosion
High → Scaling

Action/Adjustment: Adjust with alkali (e.g., sodium carbonate) or acid (e.g., diluted sulfuric acid).

 

• pH

• Hardness (Ca++, Mg++)

• Chloride (Cl-) content

• Phosphate

Test Parameter: Hardness (Ca++, Mg++)

Problem (if out of range): Scaling in coolers, pipes

Action/Adjustment: Dose with scale inhibitors or use treated water.

 

• True

• False

Test Parameter: Chloride (Cl-) content

Problem (if out of range): Low → Risk of corrosion

Action/Adjustment: Identify leaks (e.g., seawater ingress), correct, and flush the system.

 

• True

• False

Test Parameter: Oxygen content (O₂)

Problem (if out of range): High → Corrosion, pitting

Action/Adjustment: _______

 

• Increase blowdown frequency.

• Increase oxygen scavenger dosing

• Adjust phosphate dosing

• Dose with scale inhibitors or use treated water.

Test Parameter: _______

Problem (if out of range): Scaling in coolers, pipes

Action/Adjustment: Dose with scale inhibitors or use treated water.

 

• Total Dissolved Solids (TDS)

• Chloride (Cl-) content

• Hardness (Ca++, Mg++)

• Oxygen content (O₂)

Chemical: Nitrites / Molybdates

Purpose: ______

 

• Corrosion inhibitors

• Prevent scale from minerals

• Prevent microbiological growth

• Prevent boiler foaming and carryover

Chemical: _________

Purpose: Maintain pH and precipitate hardness salts

 

• Phosphates (e.g., trisodium phosphate)

• Anti-foaming agents

• Polymer dispersants

• Biocides