Hydrocarbon Processing - January 2022 - 15
Valves, Pumps and Turbomachinery
spacer. The technicians generally ignore
the punch markings as a fastener mounts
this on both ends. In this case, if the
spacer was the culprit, there should
have been more vibration amplitude
on the DE side than on the
NDE side, as this was a simply supported
pump. The author referred
to the pump's drawing for details on
installation and internals.
On referring to the drawing and
confirming with the maintenance technician,
it was determined that each impeller
was fixed to the shaft with two keys
180° apart. Pump impellers are typically
balanced as a component; however, rotating
one of the two impellers will produce
a couple of unbalances in the system.
During installation, if any one of the
impellers is rotated by 180° on its axis,
then the balancing of the entire rotor
will be disturbed. This will produce the
same signature in vibration as was witnessed
(similar to coupled unbalance).
Balancing a centrifugal pump can be
done component-wise and as an assembly.
If the impellers of this pump were
balanced component-wise, rotating the
impellers by 180° might not have caused
this much effect (multistage pumps such
as BFW pumps are generally balanced
component-wise.) However, if the impellers
and sleeve are balanced in assembled
condition, the entire correction
of the unbalanced forces of assembly is
placed on the impellers. In this case, it
becomes essential to adhere to the punch
markings done after balancing to ensure
correct mounting of components during
re-assembly. Therefore, the most probable
cause of unbalance could be that
one of the impellers was rotated at 180°
during installation.
The pump was stopped and taken into
maintenance a second time. The rotor
had an interstage sleeve between the impellers.
This sleeve had punch markings,
with corresponding punch markings on
the impellers. The markings on the sleeve
did not match the markings on one of the
impellers, which confirmed that the impeller
had been rotated by 180°. The incorrectly
mounted impeller was removed.
While installing it the correct way,
one of the keys was fouling. This fouling
key was also one of the reasons for the
error, as this key was not fouling in the
Hydrocarbon Processing - January 2022
Table of Contents for the Digital Edition of Hydrocarbon Processing - January 2022
Contents
Hydrocarbon Processing - January 2022 - Cover1
Hydrocarbon Processing - January 2022 - Cover2
Hydrocarbon Processing - January 2022 - Contents
Hydrocarbon Processing - January 2022 - 4
Hydrocarbon Processing - January 2022 - 5
Hydrocarbon Processing - January 2022 - 6
Hydrocarbon Processing - January 2022 - 7
Hydrocarbon Processing - January 2022 - 8
Hydrocarbon Processing - January 2022 - 9
Hydrocarbon Processing - January 2022 - 10
Hydrocarbon Processing - January 2022 - 11
Hydrocarbon Processing - January 2022 - 12
Hydrocarbon Processing - January 2022 - 13
Hydrocarbon Processing - January 2022 - 14
Hydrocarbon Processing - January 2022 - 15
Hydrocarbon Processing - January 2022 - 16
Hydrocarbon Processing - January 2022 - 17
Hydrocarbon Processing - January 2022 - 18
Hydrocarbon Processing - January 2022 - 19
Hydrocarbon Processing - January 2022 - 20
Hydrocarbon Processing - January 2022 - 21
Hydrocarbon Processing - January 2022 - 22
Hydrocarbon Processing - January 2022 - 23
Hydrocarbon Processing - January 2022 - 24
Hydrocarbon Processing - January 2022 - 25
Hydrocarbon Processing - January 2022 - 26
Hydrocarbon Processing - January 2022 - 27
Hydrocarbon Processing - January 2022 - 28
Hydrocarbon Processing - January 2022 - 29
Hydrocarbon Processing - January 2022 - 30
Hydrocarbon Processing - January 2022 - 31
Hydrocarbon Processing - January 2022 - 32
Hydrocarbon Processing - January 2022 - 33
Hydrocarbon Processing - January 2022 - 34
Hydrocarbon Processing - January 2022 - 35
Hydrocarbon Processing - January 2022 - 36
Hydrocarbon Processing - January 2022 - 37
Hydrocarbon Processing - January 2022 - 38
Hydrocarbon Processing - January 2022 - 39
Hydrocarbon Processing - January 2022 - 40
Hydrocarbon Processing - January 2022 - 41
Hydrocarbon Processing - January 2022 - 42
Hydrocarbon Processing - January 2022 - 43
Hydrocarbon Processing - January 2022 - 44
Hydrocarbon Processing - January 2022 - 45
Hydrocarbon Processing - January 2022 - 46
Hydrocarbon Processing - January 2022 - 47
Hydrocarbon Processing - January 2022 - 48
Hydrocarbon Processing - January 2022 - 49
Hydrocarbon Processing - January 2022 - 50
Hydrocarbon Processing - January 2022 - 51
Hydrocarbon Processing - January 2022 - 52
Hydrocarbon Processing - January 2022 - 53
Hydrocarbon Processing - January 2022 - 54
Hydrocarbon Processing - January 2022 - 55
Hydrocarbon Processing - January 2022 - 56
Hydrocarbon Processing - January 2022 - 57
Hydrocarbon Processing - January 2022 - 58
Hydrocarbon Processing - January 2022 - 59
Hydrocarbon Processing - January 2022 - 60
Hydrocarbon Processing - January 2022 - 61
Hydrocarbon Processing - January 2022 - 62
Hydrocarbon Processing - January 2022 - 63
Hydrocarbon Processing - January 2022 - 64
Hydrocarbon Processing - January 2022 - 65
Hydrocarbon Processing - January 2022 - 66
Hydrocarbon Processing - January 2022 - 67
Hydrocarbon Processing - January 2022 - 68
Hydrocarbon Processing - January 2022 - 69
Hydrocarbon Processing - January 2022 - 70
Hydrocarbon Processing - January 2022 - 71
Hydrocarbon Processing - January 2022 - 72
Hydrocarbon Processing - January 2022 - 73
Hydrocarbon Processing - January 2022 - 74
Hydrocarbon Processing - January 2022 - 75
Hydrocarbon Processing - January 2022 - 76
Hydrocarbon Processing - January 2022 - 77
Hydrocarbon Processing - January 2022 - 78
Hydrocarbon Processing - January 2022 - 79
Hydrocarbon Processing - January 2022 - 80
Hydrocarbon Processing - January 2022 - 81
Hydrocarbon Processing - January 2022 - 81A
Hydrocarbon Processing - January 2022 - 81B
Hydrocarbon Processing - January 2022 - 82
Hydrocarbon Processing - January 2022 - Cover3
Hydrocarbon Processing - January 2022 - Cover4
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201812
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019_v2
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