FI NAL PROJECT RELI ABI LITY AND PROCESS QUALITY Evaluation of Reli abil ity, M aintai nabili ty, and S afety I n H igh Press ur e Se parator V-101 Ar e a Hydrofini s hing Unit PT. AGI P RELI ABIL ITY ENGINEER : Re vi Adi kh ari s ma NRP. 2412105021 Ar fi ttari ah NRP. 241210 502 0 Ar ief Bu dhi yono NRP. 2412105018 DEPARTMEN T OF ENGI NEERI NG PH YS I CS FACULTY OF INDUSTRIAL TECHNOLOGY SEPULUH NOPEM BER INSTI TUTE OF TECHNOL OGY SURABAYA 2013
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Final Project Reliability & Process Quality - LJ (Revi a. ; Arfittariah ; Arief B.)
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8/13/2019 Final Project Reliability & Process Quality - LJ (Revi a. ; Arfittariah ; Arief B.)
High Pressure Separator is a unit that served as a separator two phase or three phase
such as oil, water, and gas. In the area of 100 - hydrofinishing unit in the recycle section,
high pressure separator separates the gas phase and liquid phase which will be passed to
the next process. Inputs that go into the high pressure separator comes from refining
reactor. Gas phase will be forwarded to the washing water receiver, while the liquid phaseis passed to the stripper.
At high pressure separator where the control loop there is a controlled flow and level. For there is a level loop LT1008 and an electrical signal is passed to LIC1008. Of LIC1008,
will be forwarded to FIC1002 where the system is a cascade system. For the inputs that go
into FIC1008 also obtained from FE1002 and FT1002 that sense of flow in the pipe. Signal
indicating that the controller has entered into will be continued to the I / P ie FY1002 in the
form of electrical signals and converted to pneumatic signal to command flow control valve.
Here is a flow control valve normally open or fail close.
In the unit there is also a protection system with sensors LSLL1010. Where the signal
of LSLL1010 which will be forwarded to an alarm LALL1010 from the system. Unsafe level
readings are also accepted by XY1010 solenoid valve to shut - off valve on XV1010 order
flow from high pressure liquid phase separator does not continue to flow and keep the level so it is not in a state of low - low.
8/13/2019 Final Project Reliability & Process Quality - LJ (Revi a. ; Arfittariah ; Arief B.)
Can be seen from the the above table that the level transmitter failed degradation of
range reading which will cause the tank level will be high and could explode. For the severity
level is II, occurence probability 2/B, critically rank 1. Recommended action is to check and
calibration transmitter. Level indicating controller failed manufacturing defect which will cause cannot transmit
signal to flow indicating controller. For the severity level is III, occurence probability 4/D,
critically rank 3. Recommended action is to check signal cable
Flow indicating controller failed wrong signal which will cause cannot give command to
flow control valve. For the severity level is II, occurence probability 3/C, critically rank 4.
Recommended action is to check signal cable.
Flow transmitter failed to flow sensing which will cause cannot transmit process variable
present value. For the severity level is III, occurence probability 1/A, critically rank 4.
Recommended action is to check and calibration transmitter.
Flow Control Valve failed positioned stuck or failed open which will cause over pressure
and allow explosion. For the severity level is I, occurence probability 5/E, critically rank 1. Recommended action is to check positioned or diaphragma valve.
8/13/2019 Final Project Reliability & Process Quality - LJ (Revi a. ; Arfittariah ; Arief B.)
In the picture above can be seen that the top event is the state failed to separated which is
caused by over-pressure, gas dehydrator trip, and flow turbulence. Three are the logical choice for the top event. After that is below the over-pressure basic events such as pump impeller was
broken and the control valve to fail closed with OR logic. For gas dehydrator is caused by over-
temperature, fluid viscosity, and safety devices not work with OR logic. Different with flow
turbulence events caused by three causes the friction on the pipe, shear induced structure, and
pipe leakage where the three cause have an AND logic.
8/13/2019 Final Project Reliability & Process Quality - LJ (Revi a. ; Arfittariah ; Arief B.)