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Gas Oil Hydrotreating UnitPT Pertamina RU VI BalonganPresented
by : Dea Amelia - TEG III14-K-101Performance Optimization Ihr
LogoYour LogoGood afternoon gentlemenThx for the opportunity given
to meToday Id like to deliver my presentation as the result of my
field practical in GO HTU PT Pertamina RU VI Balongan for 3 weeks,
under the title of .
Content14-K-101EvaluationOptimizationConclusion &
RecommendationYour LogoMy presentation will be in 4 parts.Ill start
my presentation with the overview of 14-K-101 compressor and its
function in #14 GO HTU .Next, Ill explain my evaluation on the
compressor includes the capacity, the head, and the power based on
the design parameter and current actual parameters.After do such an
evaluation, Ill try to give an optimization based on evaluation
result and the mechanical performance of the compressor.And then, I
come up with the recommendation for the compressor to get the best
performance.
Centrifugal Compressor14-K-101
Ihr LogoYour LogoGentlemen, lets get down to the businessId like
to start with an overview of
14-K-101thecompressor
Compresses a compressible fluidinto greater pressureRecycle gas
compressorCentrifugal Multistage 9 StagesYour LogoCompressor is an
equipment that compressed a compressible fluid i.e gas and air into
greater pressure. The principal is converting the kinetic energy or
velocity to pressure. Compressor is widely used in gas and
petroleum industry, such as in well exploration and exploitation,
gas transmission and distribution, and in the refinery process.
14-K-101 is a recycle gas compressor that circulate H2 for the
process in the reactor to reduce the sulfur content in the gasoil
product at GO HTU PT Pertamina RU VI Balongan.
It is a centrifugal compressor and has 9 stages.
Process Flow Diagram
14-K-101
Your Logo14-K-101 is a recycle gas compressor that circulate H2
for the process in the reactor to reduce the sulfur and nitrogen
content in the gasoil product. The discharge flow is mixed with the
H2 from H2 plant and then is mixed with the untreated gasoil. The
mixture then react with catalyst in the reactor column and forms
NH3 and H2S and treated gasoil. Out from the bottom reactor, wash
water is injected to dissolve the HH4HS. In the separator, the sour
water, gas oil, and H2 are separated. H2 flow to the compressor to
be circulated.
theprincipal
Step 1 :Low pressure gas entersStep 2 :First stage Impeller
gives kinetic energy to the gasStep 3 :Diffusers convert kinetic
energy to pressureStep 4 :Return Bend and Return Channels convert
tangential velocity, facilitate the flow to the next stageStep 5
:The final diffuser and discharge volute continue the energy
conversionSteps 2-4 :Repeated till discharge pressure is
reached
Your LogoThis is the operation principal of the centrifugal
compressor..Design Parameters
P2 = 1230 PsiaT2 = 179.6 0F 46,088.5 SCFM331.1 lbm/min 11,607
RPMPolytropic Head = 70.798,41 lbf.ft/lbm
Polytropic Efficiency = 70.2%
Actual Head = 100.852,4 lbf.ft/lbm
GHP = 60,713.16 HPCHP = 62,590.89 HPDHP = 63,868.26 HP
14-K-101P1 = 1010 PsiaT1 = 129.3 0F Your LogoAs written on the
data sheet of 14-K-101 compressor, this compressor has the design
parameters of .Centrifugal CompressorEvaluation
Ihr LogoYour LogoGentlemen, lets move on the next part, the
parameters59,990 nm3/hr615 ft3/min10,315 RPMSG = 0.08035
Z = 1.0115
k = 1.3999 n = 1.6195
pol = 74.68%
14-K-101P1 = 976.62 PsiaT1 = 111.14 0F P2 = 1119.77 PsiaT2 =
141.82 0F Your Logo14-K-101 centrifugal compressor is now operating
in such a different parameters from the design. As we might see on
the screen.Capacity Calculation
14-K-10137,200 SCFM225.57 lbm/minYour LogoBased on the
parameters, we can calculate the capacity of the compressor.The
calculation is given on the screen and the result are : for
standard capacityAnd the compressor has of flow rate.
14-K-101
Head Calculation 53,865.32 lbf.ft/lbm72,128.22 lbf.ft/lbmYour
LogoBased on the parameters, we can calculate the head of the
compressor.The calculation is given on the screen and the result
are : for polytropic headTo get the actual head, we divide the
polytropic head with polytropic efficiency, and he result is.
14-K-101
Power Calculation GHP = 29,582.07 HPCHP = 30,496.98 HPDHP =
31,119.37 HPYour LogoFor power calculationThe calculation is given
on the screenGHP isTo get CHP, we divide GHP with mechanic
efficiency of 97% and get the result ofAnd to get DHP, we divide
CHP with transmission efficiency of 98% and get the result of
Centrifugal CompressorOptimization
Ihr LogoYour LogoThats all for the evaluation, and now we move
on the optimization of the compressor.Calculation Comparison
CapacityMass Flow RatePressureTemperatureYour LogoThese are the
comparison between the design and the actual condition for
capacity, mass flow rate, pressure, and temperature. The darker
bars represent the design values and the softer bars represent the
actual conditions.As we might see on the screen, all the parameters
decrease.Calculation Comparison
HeadPowerSpeedPolytropic EfficiencyYour LogoAnd these are the
next comparison between the design and the actual condition for
speed, polytropic efficiency, actual head, and power include GHP,
CHP, and DHP.. The darker bars represent the design values and the
softer bars represent the actual conditions.As we might see on the
screen, the speed, actual head, and the power are all decreased.But
the polytropic efficiency is increased.
the
#14 needs less recycle gasDecreasing the speedCapacity is
decreasedOperation parameters are decreasedHead and power are
decreasedanalysisYour LogoThose decreasing is analyzed as the
result of the necessity of H2 or recycle gas for #14 which
decreases.The action to decrease the flow or amount of H2 is by
decreasing the speed of steam turbine which drives the
compressor.So the capacity is decreased and all the operation
parameters, suction pressure and suction temperature are also
decreased. And they cause the decreasing in head and power for
approximately 50%.
Performance CurvesYour LogoThese are the expected performance
curve of 14-K-101 compressor at the various speed.The blue lines
show the graphics for the design condition.If we plot the actual or
current capacity and the actual speed that are lower than the
design, we get that discharge pressure, the brake power, and the
polytropic head are lower than the design value.But for the
efficiency is the same as the design, and this is the best
efficiency.So we can conclude that now, the compressor is still
working at the best efficiency.
Mechanical Performance
RADIAL MAX. 75mYour Logonext, Im gonna talking about the
mechanical performance of the 14-K-101 recycle gas compressor.One
of the indicators for the mechanical performance of a compressor is
the vibration.Vibration is measured as the displacement of the
shaft for the radial and axial position.For the radial vibration,
this compressor has maximum displacement of 75 m.As we might see on
the graphic, based on the vibration data start on January 20th till
January 26th, the trend of radial displacement is still far under
the limit.It does so for the axial vibration. This compressor has
maximum displacement of 25.2 mils, and the trend of axial
displacement is also still far under the limit.
From the axial dan radial vibration tren we can conclude that
14-K-101 compressor is still in a good mechanical
condition.Mechanical PerformanceAXIAL MAX. 25.2 MILSYour Logo
14-K-101
theoptimizationVITALTrouble STOPOverhaulRoutine
InspectionPREVENTIVE MAINTENANCEYour Logo14-K-101 recycle gas
compressor was installed without any back-up or spare compressor
such us 14-K-101B. It makes the compressor becomes a vital
equipment in which if theres any trouble that forces the compressor
to be stopped, the system process in #14 would be also stopped
until the compressor had been repaired.
Because of that reason, the routine inspection and overhaul
schedule must be considered better to prevent any undesired
condition that might trouble this compressor. This is done by first
calculating the reliability of the compressor.
This is called preventive maintenance.
ConclusionRecommendationand
Ihr LogoYour LogoAnd after do such an evaluation and
optimization, we come up with the conclusion and recommendation for
14-K-101 recycle gas compressor.The necessity of recycle gas in #14
declines, therefore 14-K-101 is now operating in lower parameters,
by decreasing the turbine speed.Decreased speed causes decreasing
of head and power, but polytropic efficiency is increasing.
ConclusionYour Logo14-K-101 is in a good mechanical condition,
in which the vibration is still under the maximum limits.The
optimization of 14-K-101 is performed by increasing the intensity
of preventive maintenance.Conclusion
Your LogoThe operating parameters should be resetted to design
condition for the best efficiency.A better and integrated
preventive maintenance should be performed and the availability of
critical spare part should be considered better.Its better to do a
routine calibration on the instrumentations installed in the
compressor system.
RecommendationYour LogoThe recommendations I made to obtain
14-K-101 compressor best performance areIts necessary to record the
trouble history in detail to determine the compressor reliability
and preventive maintenance schedule.Its necessary to reconsider the
overhaul schedule regarding to the compressor work hour.Its
necessary to consider installing the back-up or spare compressor to
assure the continuity of #14 process.
Recommendation
Your Logo The End
Ihr LogoYour LogoOkay, this is the end of my presentation.Thx so
much for your attention.THANK YOUARIGATOU GOZAIMASU m=(_._)=m
14-K-101
Process Flow Diagram Your Logo
