Hp_pump 6y6f72

HP PUMP Mohitraj Rana GET (Instrumentation)

What are LNG HP Pumps? 

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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

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

No. Of Stages : 12 Motor Rating : 1500 KW, 166.3 Amps Voltage/Phase/Hz : 6600 V/3/50 Assembly length : 5700 mm

OPERATION PHILOSOPHY 

LNG HP Pumps are required to pressurize LNG up to the pressure of the send out pipe line network of the terminal.

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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.

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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 pump running.

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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 valve FV1510 is provided to maintain the required minimum flow for P104A at the time of starting of HP Pump.

VALVE 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



FV 1510 (Pump 104 A Kick Back Line)

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

VALVE ACCESSORIES 

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

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

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Solenoid Valve : Norgen Herion 24011 Series

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Limit Switch : P&F HJ5-18-GMN

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Trip Valve : Fischer 377D

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Volume Tank (30 Gallons)

HOOK UP DIAGRAM

VALVE 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.

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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.

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To attain the above condition we are using a trip valve and volume bottle arrangement.

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.

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An increasing input signal to the Type 3570 results in unbalanced pressures acting on the actuator piston, forcing it to move down.

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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.

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.

VALVE 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 is connected 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.

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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.

LEVEL SWITCH

Make: Ametek Drexelbrook Model : RXL 30 Series AAK 003086 Tag: LSL 1510 To detect low level in the HP pump suction pot. Top Mounted, Low level Fail safe

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) and amplified, 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.

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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. s open and N.C. s closed).

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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. s open and N.C. s closed).

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

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Failsafe is field-selectable using a jumper located on sensing element/circuit board side of housing.

VIBRATION MONITORING SYSTEM 

Piezo type acclerometer (Quartz) PCB Electronics make

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Excitation Voltage : 20-30 Vdc

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Resonant Freq : > 15 KHZ

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The casing surface vibration of HP pumps can be measured during pump operating 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.

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

* PHASE 2 :

ROSEMOUNT 644HAI 1 (-170 – 50 C)

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 3051

TRIPS Tag no

Description

Trip point

TAHH 1510

HP pump suction line

-120 °C

LSL 1510

Pump suction pot

1180 mm from top

IAHH 1510

Pump motor current

183 amp

IALL 1510

Pump motor current

50 amp

LALL 1441

Recondensor level

300 mm

PSHH 1801 (91 barg) To Stop pump

ESD 2 PAH 1805

OR TIH 1510 (-135 °C) LSL 1510 HSS 1517 MCC

IALL 1510 (50 Amp) IAHH 1510 (183 Amp)

OR

PUMP START PERMISSIVE 

Recondensor level must be normal.

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

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Check temperature of suction line (TAHH 1510).

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Discharge valve FV 1511 must be closed.

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

System

Tag

HH

H

Pump suction temp Pump discharge temp Pump vent

TT 1510 (°C)

-120

-135

TT 1511 (°C)

-120

TT 1512 (°C)

-120

Pump discharge PT 1510 (barg) pressure PT 1512 Gas purge (barg) pressure VT 1510 (gpk) Vibration monitor II 1510 (Amp) Motor current Discharge header Kick back flow Discharge flow

L

LL

-

110

85

1.5

0.5

10.5 183

176

54

PC 1500 (barg)

105

85

FC 1510 (m3/hr) FC 1511 (m3/hr)

450

150

435

150

445

50

THANK YOU