POWER March 2021 - 31
The Steam Blowing Operation
Based on recommendations from the
ST manufacturer, the continuous blowing
method was implemented in this
project. During SBO, adequate cleaning
force ratio (CFR) across the steam blowing
circuit must be ensured. CFR is defined
as follows:
CFR = (mb
2 × vb
) / (mo
2 × vo
)
where mb is the mass flow rate of steam
during steam blowing, mo
GAS TURBINE
is the mass
flow rate of steam during normal operating
condition where momentum is maximum,
vb
during steam blowing, and vo
is the specific volume of steam
is the
specific volume of steam during normal
operating condition where momentum
is maximum.
To ensure proper cleaning of critical
piping, a CFR of ≥ 1.2 was followed in
accordance with VGB-R 513 e guidelines.
This criterion ensures that the
2. This image shows steam being vented
through a silencer installed in the steam turbine
area during the steam blowing operation.
Courtesy: Tata Consulting Engineers Ltd.
nect these lines so that the connectivity
and flow are established while this major
piece of equipment is isolated.
When steam at high velocity is passed
through the piping, scales and small particles
that are stuck to piping internals
are carried away by the steam, thereby
cleaning the piping internals. The steam,
after traveling through the piping, is finally
vented out to atmosphere (Figure 2).
The bypass lines are service blown until
the steam vented to atmosphere is visually
clean, whereas the HP, CRH, HRH,
and LP lines are target blown, that is, target
plates are used to check the cleanliness
of these pipes. The target plates
are inserted in the temporary steam
blowing pipes. Scales and any foreign
particles removed by the steam hit the
target plate and create pits. A high number
of pits and/or larger-sized pits in the
target plate indicate poor piping cleanliness.
With repeated blows, the size and
number of pits on the target plates are
gradually reduced to minimal.
The allowable final size and number of
impacts/pits measured per square inch
of the plate is decided by the STG manufacturer.
After meeting this criterion, the
steam blowing activity for the respective
piping circuit is deemed complete and
qualified for commercial operation. The
steam blowing operation is normally carried
out in a sequential process, blowing
all the identified critical lines one after
the other.
March 2021 | POWER
www.powermag.com
31
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POWER March 2021
Table of Contents for the Digital Edition of POWER March 2021
Contents
POWER March 2021 - Intro
POWER March 2021 - Cover1
POWER March 2021 - Cover2
POWER March 2021 - Contents
POWER March 2021 - 2
POWER March 2021 - 3
POWER March 2021 - 4
POWER March 2021 - 5
POWER March 2021 - 6
POWER March 2021 - 7
POWER March 2021 - 8
POWER March 2021 - 9
POWER March 2021 - 10
POWER March 2021 - 11
POWER March 2021 - 12
POWER March 2021 - 13
POWER March 2021 - 14
POWER March 2021 - 15
POWER March 2021 - 16
POWER March 2021 - 17
POWER March 2021 - 18
POWER March 2021 - 19
POWER March 2021 - 20
POWER March 2021 - 21
POWER March 2021 - 22
POWER March 2021 - 23
POWER March 2021 - 24
POWER March 2021 - 25
POWER March 2021 - 26
POWER March 2021 - 27
POWER March 2021 - 28
POWER March 2021 - 29
POWER March 2021 - 30
POWER March 2021 - 31
POWER March 2021 - 32
POWER March 2021 - 33
POWER March 2021 - 34
POWER March 2021 - 35
POWER March 2021 - 36
POWER March 2021 - 37
POWER March 2021 - 38
POWER March 2021 - 39
POWER March 2021 - 40
POWER March 2021 - Cover3
POWER March 2021 - Cover4
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