HP_Pump

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HP PUMPMohitraj Rana

GET (Instrumentation)

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What are LNG HP Pumps?

HP pumps are high pressure pumps used to displace LNG at

high pressure to meet our send out demand.

The LNG is displaced in 12 stages in the pump and thus the high

pressure is achieved.

These pumps get the input from LP pumps at 7.2 barG

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SPECIFICATIONS

Manufacturer : Nikkiso

Liquid : LNG

Type : Centrifugal

Flow(Normal/Rated/Minimum) : 320/400/132 m3/hr Discharge Pressure : 101.7 barG

Suction Pressure : 7.2 barG

Head : 2090 m

Efficiency : 75%

RPM : 2985

BHP : 1397.7 KW

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No. Of Stages : 12

Motor Rating : 1500 KW, 166.3 Amps

Voltage/Phase/Hz : 6600 V/3/50

Assembly length : 5700 mm

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OPERATION PHILOSOPHY

LNG HP Pumps are required to pressurize LNG up to the pressure of

the send out pipe line network of the terminal.

10 nos. LNG HP Pumps are provided for Phase 1 & Phase 2 to

handle the total send out flow . These are vertical pumps mounted in

a suction barrel. A throttle valve at the discharge end limits the

maximum flow rate through each pump.

The primary protection against the excessive flow rate is provided by

discharge valve FV1511, which limits the maximum flow rate of the

pump (400m3/h : 120% of nominal flow rate) during the pumprunning.

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The flow instrument FT-1510 in LNG discharge line measures the

flow rate of LNG HP PumpP-104A , and the kick back control valveFV1510 is provided to maintain the required minimum flow for P-

104A at the time of starting of HP Pump.

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V ALVE CHARACTERISTICS

FV 1511 (Pump 104 A Discharge)

Body Style Globe 6” Body

Design Temp -165 to + 45 C

Design Pressure 130 Bar

Port Single Port

Characteristic Linear

Actuator Piston

Stroking Time < 20 sec

Air Fail Close

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Body Style Globe 4” Body

Design Temp -165 to +45 C

Design Pressure 130 Bar

Port Single Port

Characteristic Linear

Actuator Piston

Stroking Time <15 sec

Air Fail Open

FV 1510 (Pump 104 A Kick Back Line)

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V ALVE ACCESSORIES

Actuator Type : Fisher 475 (Ph 1)/585 C (Ph 2)

Positioner : Fisher 3570R (Ph 1)/3610 JP (Ph 2)

Solenoid Valve : Norgen Herion 24011 Series

Limit Switch : P&F HJ5-18-GMN

Trip Valve : Fischer 377D Volume Tank (30 Gallons)

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HOOK UP DIAGRAM

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V ALVE WORKING

Valve Operation: Electrical signal from DCS (4-20mA) is given to I/P

converter. I/P converter gives pneumatic signal (0.2-1barg) to the

positioner.

The positioner maintains the control signal by controlling the air

pressure at the top and bottom of the actuator piston. The actuator

used (model: 475(PH 1)/585C (PH 2)) has no spring action. During

Air supply failure(Instrument air header pressure failing), the control

valve is to be closed as the valve is fail to close.

To attain the above condition we are using a t r ip valve and vo lume bot t le arrangement.

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ACTUATOR/POSITIONER WORKING

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The pneumatic output signal from a controller or instrument is piped

to the bellows of the Type 3570 positioner.

An increasing input signal to the Type 3570 results in unbalanced

pressures acting on the actuator piston, forcing it to move down.

A decreasing input signal to the Type 3570 causes reverse action to

take place, resulting in unbalanced pressures forcing the actuator

piston to move upward.

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TRIP VALVE 377D

A trip valve is a special kind of valve which

will cause the actuator to fail up, lock in the

last position, or fail down when the supply

pressure falls below the trip point.

Trip valve has 6 ports and a supply port

Phase 1: The trip valve is head mounted.

Phase 2: The trip valve is side mounted.

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V ALVE WORKING

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Normal Operation: During normal operation the instrument air

supply header pressure is greater than the trip valve set

point(3.9barg), and port A is connected to port B, Port D isconnected to Port E. The air pressure from positioner goes to

actuator top and bottom through trip valve port B and port E.

According to the signal(0-100%) for valve operation the stem is

throttled.

Air Fail operation: When the air header pressure falls below trip

valve set pressure(3.9barg), port B is connected to port C and port

E is connected to vent port F. The air is vented from actuator bottom

through port E->F. The actuator top is connected to the volume

bottle through port C->B. The pressure of the volume bottle is used

to close the valve.

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LEVEL SWITCH

Make: Ametek Drexelbrook

Model : RXL 30 Series AAK 003086

Tag: LSL 1510To detect low level in the HP pump

suction pot.

Top Mounted, Low level Fail safe

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WORKING PRINCIPLE

In a simple capacitance probe-type sensing element, when the level

rises and material covers the probe, the capacitance within the circuit

between the probe and the media (conductive applications), or the

probe and the vessel wall (insulating applications), increases. This is

due to the dielectric constant (k) of the material which causes a

bridge imbalance. The signal is demodulated (rectified) andamplified, then the output is increased.

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Failsafe describes the level condition that causes the output relay to

de-energize and also the state of the relay upon loss of power.

High Level Failsafe (HLFS) is condition when probe is covered.

Relay will de-energize when level is high, indicating high level upon

loss of power. (N.O. contacts open and N.C. contacts closed).

Low Level Failsafe (LLFS) is condition when probe is uncovered.

Relay will de-energize when level is low, indicating low level upon

loss of power. (N.O. contacts open and N.C. contacts closed).

Instrument is supplied with failsafe jumper set in high level (HLFS)position.

Failsafe is field-selectable using a jumper located on sensing

element/circuit board side of housing.

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VIBRATION MONITORING SYSTEM

Piezo type acclerometer (Quartz) PCB Electronics make

Excitation Voltage : 20-30 Vdc

Resonant Freq : > 15 KHZ

The casing surface vibration of HP pumps can be measured during pumpoperating in order to detect the vibration of the pump. The vibration signal

from piezo type accelerometer attached on pump casing is indicated on PC

and DCS.

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TEMPERATURE TRANSMITTERS

Tag No Range Make Model

TT1510 -170 – 30 °C Yokogawa YTA 110

TT1511 -170 – 30 °C Yokogawa YTA 110

TT1512 -170 – 30 °C Yokogawa YTA 110

PRESSURE TRANSMITTERS

Tag No Range Make Model

PT1510 0 - 200 Bar Yokogawa EJA 440A

PT1512 0 - 2 Bar Yokogawa EJA 110A

FT1510 0 – 5000 mmwc Yokogawa EJA 110A

* PHASE 2 : ROSEMOUNT 644HAI 1 (-170 – 50 C)

* PHASE 2 : ROSEMOUNT 3051

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TRIPS

Tag no Description Trip point

TAHH 1510 HP pump

suction line

-120 °C

LSL 1510 Pump suction

pot

1180 mm from

topIAHH 1510 Pump motor

current

183 amp

IALL 1510 Pump motor

current

50 amp

LALL 1441 Recondensor level

300 mm

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PSHH 1801

(91 barg)

ESD 2

PAH 1805

TIH 1510

(-135 °C)

LSL 1510

HSS 1517

IALL 1510

(50 Amp)

IAHH 1510

(183 Amp)

MCC

To Stop

pump

OR

OR

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PUMP START PERMISSIVE

Recondensor level must be normal.

LNG level of pump pot must be normal (LAL 1510).

Check temperature of suction line (TAHH 1510).

Discharge valve FV 1511 must be closed.

Kick back valve FV 1510 to be operated automatically providingminimum flow rate to the pump.

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System Tag HH H L LL

Pump suction

temp

TT 1510 (°C) -120 -135

Pump discharge

temp

TT 1511 (°C) -120 -

Pump vent TT 1512 (°C) -120

Pump discharge

pressure

PT 1510 (barg) 110 85

Gas purgepressure

PT 1512(barg)

1.5 0.5

Vibration

monitor

VT 1510 (gpk) 10.5

Motor current II 1510 (Amp) 183 176 54 50

Dischargeheader

PC 1500(barg) 105 85

Kick back flow FC 1510

(m3/hr)450 150

Discharge flow FC 1511

(m3/hr)445 435 150

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THANK YOU

HP_Pump

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