NACE CIP Coating Inspector Level 2 Course
NACE CIP Coating Inspector Level 2 Course Fees 450 $ | NACE CIP Coating Inspector Level 2 Course Exam Fees To be informed | NACE CIP Coating Inspector Level 2 Course Duration 20 Days | NACE CIP Coating Inspector Level 2 Course Location Muscat
Environmental Controls
Environmental controls in confined space, environment should be controlled to control corrosion by reducing moisture present inside Air next to steel surface or just above the steel surface is called ‘Boundary layer’.
High humidity promotes rapid corrosion.
The salt present inthe steel surface also attracts moisture to boundary layer.
There are two ways to reduce relative humidity of the boundary layer,
- Increase the surface temperature
- Reduce moisture by dehumidification
NACE CIP Coating Inspector Level 2 Course covers In normal environmental conditions , it is essential to apply coatings to surface within a few hours of cleaning to avoid “flash rusting “.
Coating works is often delayed because of high humidity and low temperature.
Dehumidification.
Dehumidification is a process of removal of moisture from an enclosed space to lower the dew point temperature.
Enclosures
NACE CIP Coating Inspector Level 2 Course covers Proper enclosures are an integral part of a successful dehumidification project.
The enclosuremust,
Be large enough to contain whole work area.
Not larger than the performance capability of dehumidification equipment.
Minimal leakage to maintain proper environmental conditions.
Air turns
Hot air is lighter than cold air, hot air tends to rise while cold air tends to fall (stratification).
NACE CIP Coating Inspector Level 2 Course covers Condensation chances are high when cold air settles at bottom of enclosed.
The air turnover principles eliminates air stratification, or layering, in large open spaces. It does this by the recirculating the hot air that become trapped at higher levels .The uniform temperature eliminates thermal barriers and the possible formation of condensation.
Number of times this process done is called ‘air turns’.
Some manufacturers specifically suggests three air turns per hour.
One or two air turns per hour are economical.
The number of air turnscan be affected by,
- Seasons (winter /summer)
- Type of dehumidification equipment (refrigerant/desiccant)
- Manufacturer of equipment
- Manufacturer design of dehumidification
Higher temperature generally create higher corrosion rate.
Relative humidity
The ratio amount of water vapour present in given volume of air to the saturation value.
Warm air has ability to hold more moisture than cold air.
As the temperature increases,the air with greater capacity for moisture has a lower Relative humidity. As the temperature decreases the air has less capacity for moisture so the relative humidity increases.
Dehumidification.
NACE CIP Coating Inspector Level 2 Course covers Dehumidification is one of the method to remove the moisture from a closed environment of a tank, vessel, etc.
Two methods of dehumidification are:
1. Refrigeration
2. Desiccation.
Refrigeration
Refrigeration to remove moisture vapour from air is a common and economical method of dehumidification. In refrigeration process ambient air circulates over a system of refrigeration coils,the air chills, reaches saturation and condensation occurs.
NACE CIP Coating Inspector Level 2 Course covers the system then collects the condensation andpumpsit out of the system.
The air coming out will have low relative humidity and dew point. This fairly dry air is circulated in confined space and no condensation takes place on the substrate.
Desiccation
Desiccants are substances that naturally have a high affinity for water.
Desiccants absorbs moisture until they are saturated.
Desiccants are regenerated either with a heated air stream or a chemical process.
NACE CIP Coating Inspector Level 2 Course covers The moisture contained air from confined space allow to pass through a bed of desiccants .Moisture retained by desiccants, air coming out will be free of moisture.
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