CIP NACE-Level 2. Exam 4 Questions
With 100% Verified Correct Answers.
adsorbent desiccants
desicants in solid form,most common is silica gel
absorbent desiccants
liquid desiccants like sulfuric acid
boundary layer
layer of air immediately adjacent to steel surface
dehumidification
removal of H2O vapor from air to lower dew point
minimum enclosure requirements for dehumidfication
-space for operation personel and equipment
-sturdy enough to support weight, weather, and operational stress
-not too large for the equipment to be able to properly dehumidify
RH where corrosion essentially ceases
40%
Two ways to reduce the relative humidity of the boundary layer
1) increase temperature by heating 2)dehumidification
Types of dehumidification equipment include
Refrigeration and desiccant
Benefits of dehumidification
, 1) greater operation efficiency
2) lower contamination when blasting
3)better control of ambient conditions
4)greater rate of solvent evaporation
air turns(air changes)
the ratio of the volume of air flowing through a space in a certain period of time(air flow rate) to
the volume of that space(can be affected by multiple factors)
corrosion rate fact
high humidity and high pollution environments will corrode material 15-20% faster than low
pollution and arid environments
relative humidity
amount of water vapor in a given volume of air divided by the max amount of water vapor
that can be held at same temperature
relative humidity where corrosion is significantly slowed
50%
refrigeration
ambient air circulated over a system of coils and the condensation is collected and pumped out
of the system
costs of interupting dehumidification
ability to maintain prepared surface and interfere with coating curing process, which will
ulitmately cost time and money
rotating bed dehumidifier
heats ambient air and lowers its humidity(if silica becomes contaminated it will no longer
absorb moisture
use for automated wheel blast system
With 100% Verified Correct Answers.
adsorbent desiccants
desicants in solid form,most common is silica gel
absorbent desiccants
liquid desiccants like sulfuric acid
boundary layer
layer of air immediately adjacent to steel surface
dehumidification
removal of H2O vapor from air to lower dew point
minimum enclosure requirements for dehumidfication
-space for operation personel and equipment
-sturdy enough to support weight, weather, and operational stress
-not too large for the equipment to be able to properly dehumidify
RH where corrosion essentially ceases
40%
Two ways to reduce the relative humidity of the boundary layer
1) increase temperature by heating 2)dehumidification
Types of dehumidification equipment include
Refrigeration and desiccant
Benefits of dehumidification
, 1) greater operation efficiency
2) lower contamination when blasting
3)better control of ambient conditions
4)greater rate of solvent evaporation
air turns(air changes)
the ratio of the volume of air flowing through a space in a certain period of time(air flow rate) to
the volume of that space(can be affected by multiple factors)
corrosion rate fact
high humidity and high pollution environments will corrode material 15-20% faster than low
pollution and arid environments
relative humidity
amount of water vapor in a given volume of air divided by the max amount of water vapor
that can be held at same temperature
relative humidity where corrosion is significantly slowed
50%
refrigeration
ambient air circulated over a system of coils and the condensation is collected and pumped out
of the system
costs of interupting dehumidification
ability to maintain prepared surface and interfere with coating curing process, which will
ulitmately cost time and money
rotating bed dehumidifier
heats ambient air and lowers its humidity(if silica becomes contaminated it will no longer
absorb moisture
use for automated wheel blast system
