| Centrifugal Chillers |
| Absorption Chillers |
| CHILLERS |
Magnetec
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| Meeting Our Customers' Needs |
CENTRIFUGAL, SCREW & RECIPROCATING
COMPRESSOR TYPE CHILLERS
COMPRESSOR TYPE CHILLERS
Magnetec Inspection, Inc. offers specialized field techni-
cians for centrifugal, screw, and reciprocating compres-
sor type chillers. Knowledge has accumulated over years
of experience to support our technicians in analysis of
your chiller’s condition. The Eddy Current method is used
on non-magnetic materials.It can evaluate conditions such
as surface and subsurface discontinuities, alloy composi-
tion, hardness, and thickness. Eddy Current inspection ad-
dresses chiller and condenser tube damage by means of
the Eddy Current Testing (ECT).
A tailor-made inspection solution to suit your chiller tubes,
“ECT” is an electromagnetic, non-destructive diagnostic
process that detects corrosion, erosion, breakage and
leakage in the chiller heat exchanger tubes, even those
not visible to the human eye. Performing ECT on chiller
tubes every few years helps locate defects at an early
stage, well before they bring an entire system down.
cians for centrifugal, screw, and reciprocating compres-
sor type chillers. Knowledge has accumulated over years
of experience to support our technicians in analysis of
your chiller’s condition. The Eddy Current method is used
on non-magnetic materials.It can evaluate conditions such
as surface and subsurface discontinuities, alloy composi-
tion, hardness, and thickness. Eddy Current inspection ad-
dresses chiller and condenser tube damage by means of
the Eddy Current Testing (ECT).
A tailor-made inspection solution to suit your chiller tubes,
“ECT” is an electromagnetic, non-destructive diagnostic
process that detects corrosion, erosion, breakage and
leakage in the chiller heat exchanger tubes, even those
not visible to the human eye. Performing ECT on chiller
tubes every few years helps locate defects at an early
stage, well before they bring an entire system down.
For medium-sized to large facilities, centrifugal chillers are a popular choice.
They offer high operating efficiency and low maintenance requirements in a
relatively compact design. But while centrifugal chiller PM requirements might
be low, their maintenance is critical. Ignoring ECT tube inspection may drasti-
cally reduce performance and efficiency, while contributing to frequent break-
downs and early failure.
The most serious maintenance problems facing centrifugal chillers are fouling,
corrosion and air leaks. Fouling occurs when solids in the chilled and conden-
ser water drop out of suspension and attach themselves to heat transfer sur-
faces within the chiller. Even a thin layer of solids can dramatically reduce a
chiller’s operating efficiency.
Corrosion, an electrochemical process that taking place within a chiller attacks
metal surfaces, decreases the efficiency of heat-transfer surfaces and can
lead to the destruction of individual tubes. The rate of corrosion is determined
in part by the quantity of dissolved oxygen in the water, the degree of alkalinity
or acidity of the circulating water, and the concentration of dissolved solids in
the water.
Since many centrifugal chillers are low-pressure units,a leak in the system can
allow air and moisture to enter and mix with the refrigerant. Both of these sub-
stances reduce the chiller’s capacity and operating efficiency. Moisture also
mixes with refrigerant to form an acid that attacks internal components.
Corrosion is best controlled through a water-treatment program that monitors
conditions within the chilled and condenser water systems and adds in the pro-
per amount of chemicals.
They offer high operating efficiency and low maintenance requirements in a
relatively compact design. But while centrifugal chiller PM requirements might
be low, their maintenance is critical. Ignoring ECT tube inspection may drasti-
cally reduce performance and efficiency, while contributing to frequent break-
downs and early failure.
The most serious maintenance problems facing centrifugal chillers are fouling,
corrosion and air leaks. Fouling occurs when solids in the chilled and conden-
ser water drop out of suspension and attach themselves to heat transfer sur-
faces within the chiller. Even a thin layer of solids can dramatically reduce a
chiller’s operating efficiency.
Corrosion, an electrochemical process that taking place within a chiller attacks
metal surfaces, decreases the efficiency of heat-transfer surfaces and can
lead to the destruction of individual tubes. The rate of corrosion is determined
in part by the quantity of dissolved oxygen in the water, the degree of alkalinity
or acidity of the circulating water, and the concentration of dissolved solids in
the water.
Since many centrifugal chillers are low-pressure units,a leak in the system can
allow air and moisture to enter and mix with the refrigerant. Both of these sub-
stances reduce the chiller’s capacity and operating efficiency. Moisture also
mixes with refrigerant to form an acid that attacks internal components.
Corrosion is best controlled through a water-treatment program that monitors
conditions within the chilled and condenser water systems and adds in the pro-
per amount of chemicals.
| CONCENTRIFUGAL based CHILLERS |
While centrifugal chillers have been the industry
standard for years, absorption units are gaining
ground. The cost of electricity, particularly for
those who pay high demand charges or peak
rates, has led many facilities to consider chillers
driven by alternative fuels. With its ability to use
steam or natural gas, the absorption chiller gives
users that flexibility.
Proper PM of absorption chillers is critical for
their efficient operation. Like centrifugal units,
absorption chillers require a comprehensive in-
spection of the tubes to monitor for active corro-
sion and/or fouling…
Depending on chiller run time, managers should
add a comprehensive ECT inspection of the chil-
ler tubing.
standard for years, absorption units are gaining
ground. The cost of electricity, particularly for
those who pay high demand charges or peak
rates, has led many facilities to consider chillers
driven by alternative fuels. With its ability to use
steam or natural gas, the absorption chiller gives
users that flexibility.
Proper PM of absorption chillers is critical for
their efficient operation. Like centrifugal units,
absorption chillers require a comprehensive in-
spection of the tubes to monitor for active corro-
sion and/or fouling…
Depending on chiller run time, managers should
add a comprehensive ECT inspection of the chil-
ler tubing.
| Open Recirculating Water Loop or Cooling Tower Circuit (Open Loop) |
Cooling
Tower
Tower
| Pump |
| -95 F Water |
| o |
| Chilled Water Loop or Chilled Water Circuit (Closed Loop) |
| -85 F Water |
| o |
| Condenser |
| -40 F Water |
| o |
| -50 F Water |
| o |
| Pump |
| Evapo- rator |
| Air Handling Units |
| Compressor |
