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PREPARED BY:

GOVIND YADAV(GET-INST)

Temporary Truck Loading Facility

(TTLF)

.

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Design Basis

Loading flow rate (max , normal , min):

(41040 ,20400, 2040) kg/hr

Recirculaton flow rate (normal ) :400 kg /hr.

Operating pressure : 9.5 barg for recirculation/ 1 barg for vapour line.

Operating temperature : -165°C

System design pressure:18.5 barg for supply/7 bargfor vapore line

System design (max,min temperature): -165/60 °C

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TTLF

LNG TERMINAL WITH ROAD TANKER

SHIPLNG TANK

LP

PUMP HPPUMP

R

E

C

O

N

D

E

N

S

O

R

BOG

COMP.

UNLOADING/ VAPOR

RETURN ARMS

TRUCK

STV & SCVCooling Down Lines

Drain Return Line

Drain Drum

V-903

Pump

VAPOR LINE

FEED LINE

RETURN LINE

To Vaporiser

MOV 13001

MOV 13002

HIC

13001

HIC

13003

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TRUCK LOADING SKID CONSISTS OF

• Skid

• Weigh bridge

• The Weigh bridge room with PLC

• Human machine interface

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The skid

4″ main feed line, tapped from 16″ LP header.

3″ line tapped from 4″ main feed line to LNG loading arm.

4″ Recirculation line provided.

3″ Vapor return line provided

Loading & vapor return arm(3″ size) designed for 18.5 barg

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The Weigh bridge

Consists of mechanical platform,load cells, junction box, weighing

electronics..

Robust in construction, steel

fabricated.

Top plate of MS steel, with anti skidproperties.

Capacity 0 – 50 tonnes

Pit less type

Make up-Strategic weightingsystems limited.

Platform size : 18m X 3m

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Operating principle

Electronic configuration: Wheatstone bridge(a measuring instrument).

Used to measure an unknown resistance by balancing two

legs of a bridge circuit.

R x is the unknown resistance,

R 1, R 2 and R 3 are

known resistances

Rx = (R2/R1)/R3

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http://upload.wikimedia.org/wikipedia/commons/9/93/Wheatstonebridge.svg

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WeWr Weigh bridge roomidge room

Converts signals produced by load cell, to digital

representation of weight.

The weigh bridge room contains the PLC and Human

Machine Interface (HMI).

HMI is, operator’s window to start, batch operation of filling

and monitor filling operation.

Unsafe conditions of plant, due to LNG spillage, gas leak or fire, automatically causes ESD TTLF, stop filling operation

and isolates skid from the plant

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CONTROL VALVE9

Make: Flow servecorp.

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Earthing relay 10

Make :Scully ( 30 feet coil cable)•It provide intelligent

grounding verification with

self-proving connection to

the ground ball & bolt.

•The ground ball & bolt can

be installed in few minutes

•It prevents loading until a

proper groung has been

established.• Automatically shuts off

loading operation if ground

is broken any time

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Mass flow meter11

Coriolis Mass Flow meter uses

The Coriolis effect to measure theamount of mass moving throughthe element.This flow meter is used formeasuring lng in ttlf.

Fluid to be measured, runsthrough U-shaped tube that is vibrates by oscillating driver at itsnatural frequency.

Coriolis meter is comprised of two element a sensor andtransmitter.

It can directly measure the massof a flowing fluid & also measure

the flowing fluid density.

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Working priciple12

The arm through which fluid flows away from the axis of rotation must exert a force on the fluid, to increase its

angular momentum, so it bends backwards. The arm

through which fluid is pushed back to the axis of rotation

must exert a force on the fluid to decrease the fluid's

angular momentum again, hence that arm will bend

forward.

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Filling operation

Truck should be in proper location on ramp

Ignition should be off, Wheels should be choked & truck should be

grounded.

Lng & Vapour arm should be with positive nitrogen pressure.

Operater calculate wt of truck. Check for residual LNG(heel) in thetruck tank.

Oxygen less should be than 3% of lel.

Once check list established downstream FV 13002 shall be opened.(

purging with nitrogen is to be done).

Operator calculate tare wt of truck in weigh bridge panel. By calculating heel operator calculate lng to be filled in lng truck. He

reset wt in weigh bridge panel & start filling operation.

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Filling operation

By calculating heel operator calculate lng to be filled in lng

truck. He reset wt in weigh bridge panel & start filling

operation.

Some amount is constantly recirculated through FV 13003

(3600kg/hr).

Intially FV 13001 is opened 13% then it can ramp upto

83% .

When filling reaches to 98 % of filling capacity of truck, it is

again ramp down to 13 %( total lng filled = (total wt) – (t wt

+ heel).

After filling operation , by isolating system(closing movp

13001 & fv 13001). Lng is drain out from loading arm .

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Safety Features for TTLF

Emergency shutdown system can be activated by

2 UV-IR flame detectors.

7 Spill detectors

7 Gas detectors

Water sprinkler system, 2 DV with option of operating in

auto & manual mode (ttlf control).

Earthing system for Tanker and Skid

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16

EARTHING SWITCH

Hs 12052

Hs 12051

ESD 2 PSHH13005

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FIRE DETECTOR

The IR sensor is sensitive to radiation over the range of 2.5-3.0

micron.

The IR channel will register a detection signal, at the appropriate

level, when the IR sensor is exposed to radiation in the appropriate

frequency range, having an intermittent gleam pattern characteristic

to flickering-fire, and a preset threshold and time duration arereached.

The UV sensor is sensitive to radiation over the range of 0.185-0.260

micron.

The UV channel incorporates a special logic circuit that eliminates

false alarms caused by solar radiation and other non-fire UV sources.

Simultaneous detection of radiation in both the UV and the IR

channels having an intensity, which exceeds detector’s preset Alarm

level, will result in an Alarm

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GAS DETECTOR

• The detection is based on infrared radiation passingthrough volume of air

• It employs a dual beam , dual wavelength with

separate optical detector.• Different types of gas have unique gas absorption

spectra. They can be easily identify by properselection of wavelength at which absorption is

measured.• By camparing transmission of two wavelenght , the

gas concentration in air can be determined

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GAS DETECTOR 19

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Pressure switch

Pressure switch is a form

of switch that makes electrical

contact when a certain

set pressure has been reached onits input.

This is used to provide on/off

switching from

a pneumatic or hydraulic source. The switch may be designed to

make contact either on pressure

rise or on pressure fall

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Make : switzerModel :

GK-201-02-a8k-g-zRange : 1 to 16 bar

Set at 5.5 barRising pressure

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Spill detector

Total we have 7 spill detector including 3 on skid atttlf

In spill detector pt 100 is placed where there is a

possibility of leak . If due to leak any lng fall on it .

Its resistance change rapidly giving an alarm aboutlng leakage

Make: emerson

Resistance thermometer :pt 100

Length :200mm.

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Level switch

• In a simple capacitance probe-type sensingelement, when the level rises and materialcovers the probe, the capacitance within thecircuit between the probe and the media or theprobe and the vessel wall , increases.

• This is due to the dielectric constant (k) of thematerial which causes a bridge imbalance. Thesignal is demodulated and amplified, then theoutput is increased.

• if medium is non conductive then it provide alarge change in dielectric constant

• If medium is conductive then insulated probe isused & capacitance is formed by outer surface of

insulation & electrode

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Make : dexelbrook Model : PGL 2272-dl1z0356-200+aq

Press/ temp :67 bar@38c

Trip: 270 mm

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Cause & effect23

CAUSE EFFECTHSS 12051, HSS 12052,

ESD 2, FGS Detection

ESD TTLF

ESD TTLF, PAHH 13005

WAHH 13001

MOVP 13001

(LNG supply valve close)

ESD TTLFMOVP 13002 (vapor return valve

close)

ESD TTLF

HCV 13003 (recirculation valve close)

FV 13001(tanker inlet line control valve

close)

ESD TTLF, PAHH 13005, ZSL 13002, PAL

13003

FV 13001 (inlet line control valve open) ZSH 13002(MOVP 13002 open)

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Ttlf plc24

Make : Allen bradley Micrologix controller 1500

Supply: 110 v ac

Single processor , supply & i/o module

14 k words of user configurable for program & data

Supply: Digital i/p :48

Digital o/p : 16

Analogue i/p : 16

Analogue o/p : 16

Communication : RS 232 communication port.

Scan time: 50ms

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CONFIGURATATION25

CPU + I/P ANALOGUE

I/P

MODULE 1

EXPANSION ANALOGUE

I/P

MODULE 2

EXPANSION ANALOGUE

I/P

MODULE 3

EXPANSIONDIGITAL

I/P

MODULE 1

EXPANSIONDIGITAL

I/P

MODULE 2

EXPANSIONDIGITAL

I/P

MODULE 3

EXPANSION

RTD

MODULE 1

EXPANSION

ANALOGUE

O/P

MODULE 2

EXPANSION

DIGITAL

MODULE 2

EXPANSION

DIGITAL

MODULE 1

EXPANSION

RTD

MODULE 2

EXPANSION

I/P COUNTER

MODULE

2 SPARE

SLOT

POWER SUPPLY

(FOR ALL CARDS)

1769

CRL 1

+-E

CPU

RS- 232

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PCU 300 a pressurized enclosure system26

PEPPERL-FUCHSFA6 PCU 300A EX 014

• A pressurized enclosure system

comprise of of control unit ,pressure

moniter ,solenoid valve & housing.

• Air or inert gas such as nitrogen is

fed into the enclosure housing

producing a non explosive

atmosphere to avoid ignition source

•Control unit with pressure switchmoniter circulation process &

pressure

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CABLE BLOCK DIAGRAM27

Analog jb AJB - 13002

Digital jbDJB - 13001

Digital jbDJB - 13001

F& g detectorsignal

FJB 13004

Ttlf plc (Allen bradley)

HS 12052, D.V

CONTROL,WEIGH BRIDGE

HUMAN

MACHINEINTERFACE

HS 12051,2 FSD,3 GSD

ER SWITCH&

SOLENOIDSUPPLY

VAL VELIMIT

SWITCH &

PSHH

I/P,CONVERTER

PT,TT

AJB 13005

FJD 13007

AJB 13006 TT, PT

4 GD OFF

SKID

TT13003,13004,

FT 13001

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Thank you

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ttlf

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