POWER September 2016 - 56

COMBINED CYCLE O&M
Table 1. Increased variable operation
and maintenance costs for
low-load and load-following for
a 500-MW combined cycle gas
turbine (CCGT) plant. Source: Tetra
Engineering
Case
Nominal: no automatic generation control
(AGC), 2004 extended
Nominal with 90 days 2 x 1 AGC
Nominal with 180 days 2 x 1 AGC
Nominal with 60 days 2 x 1 AGC/30 days
2 x 1 AGC with steam turbine bypass
$/MWh
$2.00
$2.12
$2.27
$2.26
1. Trend of corrosion-fatigue tube
leaks. This image shows the progression of
corrosion-fatigue high-pressure economizer
tube leaks in five units over time. Source:
Tetra Engineering
20
18
16
14
12
10
8
6
4
2
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15
Year of operation
tor recommendations are compiled for comparison
with Tetra's review recommendations.
■ Warranty inspections
■ Baseline condition inspections
■ Annual inspections
■ HP evaporator deposit weight density laboratory
evaluations
■ HRSG FAC/EW/LDI inspections
■ T91/P91 inspections
■ Creep inspections
■ Water chemical vendor inspections
■ Borescope/videoscope inspections
■ Statutory inspections
From these inspections, third-party inspecReview
of Current HRSG Condition
Separate from the review of known failures
and history, a detailed review of the design,
inspection history, and susceptibilities to
industry problems are summarized using
Tetra's experience from prior condition assessments
of HRSGs with similar design and
known issues for the HRSG design.
These include prior engineering studies
(thermal design evaluations, metallurgical
root cause failure analysis, and other engineering
design projects). The assessment
evaluates the current condition of each
HRSG and addresses the following topics:
■ High-temperature components
■ HP, IP, and LP steam systems
■ Condensate preheater/LP economizer and
feedwater supply to HP and IP economizers
■ HP and RH steam attemperation
■ Water chemistry control
■ Interconnecting piping
■ HRSG structures: transition duct, distribution
grids, expansion joints (hot, cold),
manway doors, structural steel (inside casing),
exhaust stack, dampers, and silencers
16
2. Corrosion-fatigue cracks in
economizer tubes. Here you can see
corrosion-fatigue cracks on the inner diameter
of the HRSG HP economizer. Courtesy: Tetra
Engineering
CIRCLE 26 ON READER SERVICE CARD
56
www.powermag.com
POWER | September 2016
Number of tubeleaks

http://www.powermag.com

POWER September 2016

Table of Contents for the Digital Edition of POWER September 2016

Contents
POWER September 2016 - Cover1
POWER September 2016 - Cover2
POWER September 2016 - Contents
POWER September 2016 - 2
POWER September 2016 - 3
POWER September 2016 - 4
POWER September 2016 - 5
POWER September 2016 - 6
POWER September 2016 - 7
POWER September 2016 - 8
POWER September 2016 - 9
POWER September 2016 - 10
POWER September 2016 - 11
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POWER September 2016 - Cover3
POWER September 2016 - Cover4
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