Hydrocarbon Processing - May 2021 - 58
Valves, Pumps and Turbomachinery
FIG. 5. A 12-stage, opposed impeller with
center-stage bushing.
FIG. 3. Thermal signature of recycle valve passing condition.
FIG. 6. Baseline signature with uniform casing
temperature.
FIG. 7. Thermal signature with casing
temperature anomaly.
FIG. 4. Multi-stage, axially-split, opposed impeller pump.
nent over a period of time. This method
works well for inspecting mechanical
equipment when normal thermal signatures are complex. In these cases,
thermal signatures indicate failure
slowly, such as electrical components,
valve leakage, seal flush line blockage
or fouling, etc.
PUMPING SYSTEM
PRACTICAL APPLICATIONS
The following outlines typical thermal imaging applications related to
pumping systems:
* Pump and driver bearing
housings to baseline, and
detecting early bearing failure
or oil and cooling system
inadequacies
* Pump recycle and discharge
check valve passing conditions
* Mechanical seal support systems,
58 MAY 2021 | HydrocarbonProcessing.com
including flush lines, heat
exchangers, cyclone separators
and seal glands
* Pump casings to detect
center-stage throttle
bushing distress.
Mechanical seal support system. A
thermal signature of a mechanical seal
API Plan 21 seal flush system, including the heat exchangers, is shown in
FIG. 1. Thermal imaging identified high
skin temperatures on the heat exchanger
shells resulting from fouling of the water
side of the cooler.
FIG. 2 shows a thermal signature of
an API Plan 11 seal flush line, which
showed significant temperature difference (~26°F) between the take-off point
and the downstream seal flush line. Periodic thermal scanning can quickly identify plugged seal flush lines, which can
result in early mechanical seal failure.
Pump recycle valve passing condition. FIG. 3 shows a thermal signature of
a boiler feedwater pump recycle valve,
where the temperature profile across the
valve clearly indicates a passing condition. As shown, the recycle line downstream of the recycle valve is similar to
the process fluid temperature.
Multi-stage pump center-stage
bushing failure. A typical axially split,
multi-stage, opposed impeller design
pump is shown in FIG. 4. The opposed impeller design is used by pump designers to
balance axial thrust forces, and requires a
center-stage bushing to isolate the higher
pressure from the crossover stages.
FIG. 5 shows a 12th-stage, opposed
impeller design with the center-stage
bushing to isolate the 12th stage from
the 6th stage. This center-stage bushing
arrangement is designed for controlled
throttling of this high differential pressure across the bushing, as well as for hydrodynamic support of the rotor.
http://www.HydrocarbonProcessing.com
Hydrocarbon Processing - May 2021
Table of Contents for the Digital Edition of Hydrocarbon Processing - May 2021
Contents
Hydrocarbon Processing - May 2021 - Intro
Hydrocarbon Processing - May 2021 - Cover1
Hydrocarbon Processing - May 2021 - Cover2
Hydrocarbon Processing - May 2021 - Contents
Hydrocarbon Processing - May 2021 - 4
Hydrocarbon Processing - May 2021 - 5
Hydrocarbon Processing - May 2021 - 6
Hydrocarbon Processing - May 2021 - 7
Hydrocarbon Processing - May 2021 - 8
Hydrocarbon Processing - May 2021 - 9
Hydrocarbon Processing - May 2021 - 10
Hydrocarbon Processing - May 2021 - 11
Hydrocarbon Processing - May 2021 - 12
Hydrocarbon Processing - May 2021 - 13
Hydrocarbon Processing - May 2021 - 14
Hydrocarbon Processing - May 2021 - 15
Hydrocarbon Processing - May 2021 - 16
Hydrocarbon Processing - May 2021 - 17
Hydrocarbon Processing - May 2021 - 18
Hydrocarbon Processing - May 2021 - 19
Hydrocarbon Processing - May 2021 - 20
Hydrocarbon Processing - May 2021 - 21
Hydrocarbon Processing - May 2021 - 22
Hydrocarbon Processing - May 2021 - 23
Hydrocarbon Processing - May 2021 - 24
Hydrocarbon Processing - May 2021 - 25
Hydrocarbon Processing - May 2021 - 26
Hydrocarbon Processing - May 2021 - 27
Hydrocarbon Processing - May 2021 - 28
Hydrocarbon Processing - May 2021 - 29
Hydrocarbon Processing - May 2021 - 30
Hydrocarbon Processing - May 2021 - 31
Hydrocarbon Processing - May 2021 - 32
Hydrocarbon Processing - May 2021 - 33
Hydrocarbon Processing - May 2021 - 34
Hydrocarbon Processing - May 2021 - 35
Hydrocarbon Processing - May 2021 - 36
Hydrocarbon Processing - May 2021 - 37
Hydrocarbon Processing - May 2021 - 38
Hydrocarbon Processing - May 2021 - 39
Hydrocarbon Processing - May 2021 - 40
Hydrocarbon Processing - May 2021 - 41
Hydrocarbon Processing - May 2021 - 42
Hydrocarbon Processing - May 2021 - 43
Hydrocarbon Processing - May 2021 - 44
Hydrocarbon Processing - May 2021 - 45
Hydrocarbon Processing - May 2021 - 46
Hydrocarbon Processing - May 2021 - 47
Hydrocarbon Processing - May 2021 - 48
Hydrocarbon Processing - May 2021 - 49
Hydrocarbon Processing - May 2021 - 50
Hydrocarbon Processing - May 2021 - 51
Hydrocarbon Processing - May 2021 - 52
Hydrocarbon Processing - May 2021 - 53
Hydrocarbon Processing - May 2021 - 54
Hydrocarbon Processing - May 2021 - 55
Hydrocarbon Processing - May 2021 - 56
Hydrocarbon Processing - May 2021 - 57
Hydrocarbon Processing - May 2021 - 58
Hydrocarbon Processing - May 2021 - 59
Hydrocarbon Processing - May 2021 - 60
Hydrocarbon Processing - May 2021 - 61
Hydrocarbon Processing - May 2021 - 62
Hydrocarbon Processing - May 2021 - 63
Hydrocarbon Processing - May 2021 - 64
Hydrocarbon Processing - May 2021 - 65
Hydrocarbon Processing - May 2021 - 66
Hydrocarbon Processing - May 2021 - 67
Hydrocarbon Processing - May 2021 - 68
Hydrocarbon Processing - May 2021 - 69
Hydrocarbon Processing - May 2021 - 70
Hydrocarbon Processing - May 2021 - 71
Hydrocarbon Processing - May 2021 - 72
Hydrocarbon Processing - May 2021 - 73
Hydrocarbon Processing - May 2021 - 74
Hydrocarbon Processing - May 2021 - 75
Hydrocarbon Processing - May 2021 - 76
Hydrocarbon Processing - May 2021 - 77
Hydrocarbon Processing - May 2021 - 78
Hydrocarbon Processing - May 2021 - 79
Hydrocarbon Processing - May 2021 - 80
Hydrocarbon Processing - May 2021 - 81
Hydrocarbon Processing - May 2021 - 82
Hydrocarbon Processing - May 2021 - 83
Hydrocarbon Processing - May 2021 - 84
Hydrocarbon Processing - May 2021 - 85
Hydrocarbon Processing - May 2021 - 86
Hydrocarbon Processing - May 2021 - 87
Hydrocarbon Processing - May 2021 - 88
Hydrocarbon Processing - May 2021 - 89
Hydrocarbon Processing - May 2021 - 90
Hydrocarbon Processing - May 2021 - Cover3
Hydrocarbon Processing - May 2021 - Cover4
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