CONTENTS · SITE SPECIFIC SAFE OPERATING PROCEDURE QUALITY CONTROL LABORATORY, ... Doctor Test of...

SITE SPECIFIC SAFE OPERATING PROCEDURE

QUALITY CONTROL LABORATORY, LPG DEPERTMENT

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Moderated on 16th

May, 2015

CONTENTS

1. Activities of Quality Control Laboratory

2. General Safety Precaution for Quality Control Laboratory

3. SOP-01: Air Generator Operation

4. SOP-02: Nitrogen Generator Operation

5. SOP-03: Hydrogen Generator Operation

6. SOP-04: Doctor Test of LPG

7. SOP-05: Weathering (Volatility) Test of LPG

8. SOP-06: Vapour Pressure Measurement of LPG

9. SOP-07: Vapour Pressure Measurement of Condensate

10. SOP-08: Density Measurement of LPG

11. SOP-09: Density & Specific Gravity Measurement of Condensate

12. SOP-10: Dew Point Measurement

13. SOP-11: Gas Detection

14. SOP-12: Analysis of Natural Gas & Residual Gas

15. SOP-13: Analysis of LPG

16. SOP-14: Conductivity Measurement

17. SOP-15: pH Measurement

18. SOP-16: Precision Weighing using Electronic Balance

19. SOP-17: Chemical Treatment of Raw & Cooling Water



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ACTIVITIES OF QUALITY CONTROL LABORATORY

Quality Control Laboratory is an integral part of LPG Department and is playing a vital role in

achieving Department’s objectives by carrying out regular activities related to quality control of

product (LPG) as per specification IS:4576:1999. The laboratory is also responsible for monitoring

water quality to comply with norms of Pollution Board, water quality for human consumption and

industrial use. The activities of this section mainly include:

a) Compositional analysis of Gas and LPG in Gas Chromatograph.

b) Checking physical properties of LPG by Weathering and Vapour Pressure tests.

c) Monitoring Mercaptan level in LPG (Doctor Test)

d) Monitoring of drinking water parameters for its quality assurance IS standard.

e) Monitoring the effluent drain water

f) Monitoring of Raw and Cooling water

g) Monitoring of Dew point temperature of Gas Inlet, Dehydrator Plant, Air inlet to

Recovery Plant and Air Inlet to Filling Plant

h) Regular Explosive Gas Testing throughout LPG Recovery Plant and LPG Filling Plant.

i) Regular Chemical Dosing of Water Cooling Plant

j) The section is also responsible for monitoring stock of Mercaptan and Hydrogen

cylinders, Helium cylinders for smooth running of Online GC and Offline GC.

k) Monitoring schedule for Ambient Air Quality Monitoring

l) Responsible for Quality Certificate of LPG to IOCL

The total manpower of the QC Lab is 05 nos. including executive, company employee.



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GENERAL SAFETY PRECAUTION FOR

QUALITY CONTROL LABORATORY-LPG

1.01 Toolbox Meeting must be done everyday before job allocation / starting of job.

1.02 Special PPE’s relevant to the specific job must be used while doing the job. Safety shoes

must be used all the times.

1.03 Inspect each apparatus / tool for damage before use.

1.04 Keep all operational area clean. Keep the apparatus / tool at their proper storage location.

1.05 Un-authorized persons should not be allowed in the working area of QC Lab.

1.06 Outsiders / Trainees / Visitors should be always under supervision.



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SOP-01: AIR GENERATOR OPERATION

PURPOSE

Air generator is used for on-the-spot generation of moisture, hydrocarbon and

all other impurity free Air, required for Chromatographic analysis to ignite

the Flame Ionisation Detector.

HAZARDS No hazard

PPE’s Laboratory Apron.

PREPARATION NA

STEP BY STEP

PROCEDURE

SWITCH ON

1)Switch on the main power supply of Zero Air generator.

2) Switch on the power switch of Zero Air generator.

3) Unit will begin a pressure build up.

4) Lower Gauge indicates the Output Pressure which is factory set at 80

psig

5) The Upper Gauge indicates the Internal Receiver pressure which will

fluctuate between 120 to 90 psig.

6) The Digital Display shows the Catalytic Chamber Temperature, factory

set at 400 deg C

7) The two LEDs will change from RED to GREEN when the generator is

ready to use.

8) The Generator should reach operating temperature within 40 minutes of

switch-on.

SWITCH OFF

1) After switching off the GC, press the Stop button and wait for some

time for “Generator Ready” display.

2) Then switch off the Zero Air generator.



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SOP-02: NITROGEN GENERATOR OPERATION

PURPOSE Nitrogen generator is used for on-the-spot generation of Pure Nitrogen gas

required for Chromatographic analysis as carrier gas.

HAZARDS No Hazard


PREPARATION NA

STEP BY STEP

PROCEDURE

SWITCH ON

1)Switch on the main power supply of Nitrogen generator.

2) Then press the Start button.

3) Wait some time to attain the “Nitrogen Stand by” display.

SWITCH OFF

1) After switching off the GC, press the Stop button and wait for some time

for “Generator Ready” display.

2) Then switch off the Nitrogen generator.



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SOP-03: HYDROGEN GENERATOR OPERATION

PURPOSE Hydrogen generator is used for on-the-spot generation of Pure Hydrogen gas

required for Chromatographic analysis of LPG sample

HAZARDS No Hazard


PREPARATION NA

STEP BY STEP

PROCEDURE

SWITCH ON

1. Ensure that Conductivity of deionised water is 1micro Siemen or better

2. Observe the distilled water level of the generator.

3. Switch on the Hydrogen generator.

4. Press the “SET” button and simultaneously rotate the “Pressure Adjust’ to

preset the output gas pressure (60 psi) to the preset pressure.

5. Once the pressure is set, release the “SET” button

6. The Digital Pressure Display will display the actual pressure generated by

the unit

7. The generator will now undergo “System Check” to ensure that the

generator is gas tight by pressurizing itself internally and ready for pressure

generation upto the preset pressure.

8. During this time, no hydrogen is delivered for a maximum of 6 minutes.

9. Once the generator has passed the “System Check” to the preset pressure,

the SYSTEM CHECK LED will go out & Delivery Valve will open & allow

hydrogen gas flow to the gas Chromatograph.

SWITCH OFF

1. Press the “SET” button and simultaneously rotate the “Pressure Adjust’

fully anti-clockwise.

2. This will effectively stop all hydrogen production.

3. Gradually release the hydrogen pressure

4. The Pressure Display in the Generator will slowly fall towards zero psi/bar

5. When Pressure Display reads zero psi/bar, then switch OFF the generator.



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SOP-04: DOCTOR TEST OF LPG

PURPOSE

LPG is a colourless, odourless and highly flammable gas. Ethyl Mercaptan

(C2H5SH), an odorizing agent, is added to LPG storage vessel before delivery

of LPG to Bottling and Bulk Filling Plant. This enables the consumers to

easily detect any LPG leakage. Doctor test is carried out to ensure the level of

Mercaptan is present in LPG. This is required for safety of men and material

and is followed as per Indian Standard IS 4576

HAZARDS 1) LPG vapour and Ethyl mercaptan can cause flash fires. Keep away from

heat, sparks and open flames.

2) Avoid prolonged breathing of vapour and skin contact.

PPE’s Helmet, Safety boot, goggles, hand gloves & non- sparking tool etc.

PREPARATION Plumbite solution, Sulphur powder and 50ml graduated cylinder

STEP BY STEP

PROCEDURE

1.Take 10ml of the sample (LPG) in 50ml graduated cylinder and add 5ml of

sodium plumbite solution and shake them vigorously for 15 seconds.

2. Add small quantity of Sulphur (just to cover the interface between the

sample and the sodium plumbite solution). Shake the mixture vigorously for

15 seconds and allow it to settle for 1 minute.

The presence of mercaptans or hydrogen Sulphide or both is indicated by

discolouration of the Sulphur floating at the oil-water interface or by

discolouration of either of the phases.



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SOP-05: WEATHERING (VOLATILITY) TEST OF LPG

PURPOSE This method is intended to determine the volatility of liquefied petroleum

gases (LPG). This test is to ensure that quality of LPG conforms to IS

4576:1999

HAZARDS 1) LPG vapour can cause flash fires. Keep away from heat, sparks and open

flames.

2) Skin contact may cause cold burn.


PREPARATION Weathering Test apparatus and sample to be tested

STEP BY STEP

PROCEDURE

1. Sample is collected in a Reid Vapour Pressure Apparatus as per procedure

given in Standard (ASTM D-1837).

2. 100cc of LPG sample is transferred in a graduated conical test tube.

3. A thermometer of +ve and –ve marking is immersed inside the test tube.

4. LPG starts to evaporate automatically at room temperature.

5. Evaporation temperature at volume of 25%, 50%, 90% & 95% are recorded.

6. When LPG volume reduces to 50%, tap water in a beaker is placed at the

bottom of the vaporizing LPG in the graduated tube.

7. The evaporation temperature at 95% by volume is recorded and reported as

volatility evaporation temperature for 95% by volume at 760mm of Hg

pressure.

8. As per Indian standard IS-4576 maximum allowable limit is + 2°C and

there should not be any residue in the test tube



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SOP-06: VAPOUR PRESSURE MESURMENT OF LPG

PURPOSE

LPG vapour pressure is important for two reasons. Firstly, it is required to

ensure that the pressure of a given mixture is less that which the steel shell of

any containing vessel is designed to withstand at the highest service

temperature; secondly, to ensure that the LPG is sufficiently volatile to

provide for a prescribed gas off take rate by natural vaporization

HAZARDS 1) LPG vapour can cause flash fires. Keep away from heat, sparks and open

flames.

2) Skin contact may cause cold burn.


PREPARATION VP apparatus, Water Bath and sample to be tested

STEP BY STEP

PROCEDURE

1. After proper purging of the sampler, about 500 CC of LPG from storage

vessel or from Recovery Plant is collected in a Reid vapour apparatus as per

standard procedure.

2. When the apparatus is completely filled up with vapour sample (indicated

by liquid droplet from the bleeder valve), close the bleeder valve, the inlet

valve and the sampling line.

3. Close the straight-through valve between the two chambers.

4. Open the inlet valve till no liquid comes out from the valve (i.e release of

20% sample to allow space for expansion)

5. Immediately open the straight-through so that sample is distributed in both

the chambers.

6. Again close the straight-through valve between the two chambers.

7. Open the inlet valve again till no liquid comes out from the valve (i.e

release another 20% sample to allow space for expansion. As per standard

requirement, thirty three and one half to forty percent of the total sample to be

released out. This sample is utilized for weathering test).

8. Reid vapour pressure apparatus is then inverted & shake properly.

9. Return back the apparatus to normal upright position and put in a water bath

which is being pre set at 400C

10. Observe the apparatus assembly throughout the test period to ensure

freedom from leaks. Discontinue the test and discard the results at any time

the leak is detected.

11. After 05 min have elapsed, withdraw the apparatus immediately from

water bath, invert it, shake it vigorously. Tap the pressure gauge gently and

note down the pressure reading in the gauge. Return back the apparatus to

water bath.

12. This process normally takes about 20 to 30 minutes to attain equilibrium.

13. After this period, if consecutive gauge readings are constant, note this

reading as the Vapour Pressure of LPG.



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SOP-07: VAPOUR PRESSURE MESURMENT OF CONDENSATE

PURPOSE Condensate is a byproduct from LPG Recovery Plant. Condensate is sold to

private companies. To monitor its quality Vapour Pressure is tested.

HAZARDS 1) Condensate vapour can cause flash fires. Keep away from heat, sparks and

open flames.

2) Avoid prolonged skin contact.

PPE’s Helmet, Safety boot, goggles, mask, hand gloves, non-sparking tools etc.

PREPARATION VP apparatus, Water Bath and sample to be tested

STEP BY STEP

PROCEDURE

1. The lower condensate chamber is first rinsed thoroughly with the sample to

be tested.

2. Fill the lower chamber completely with the sample (approx 35 ml).

3. Immediately connect with the air chamber.

4. Turn the vapour pressure bomb upside down and shake it vigorously.

5. Repeat this several times

6. Place the vapour pressure bomb in a water bath preset at 37.8 deg C

7. Reid vapour pressure apparatus is then shaked well and put in a water bath

which is being preset at 37.80C

8. Observe the apparatus assembly throughout the test period to ensure

freedom from leaks. Discontinue the test and discard the results at any time

the leak is detected.

9. After 05 min have elapsed, withdraw the apparatus immediately from water

bath, invert it, shake it vigorously. Tap the pressure gauge gently and note

down the pressure reading in the gauge. Return back the apparatus to water

bath.

10. This process normally takes about 20 to 30 minutes to attain equilibrium.

11. After this period, if consecutive gauge readings are constant, note this

reading as the Vapour Pressure of Condensate.



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SOP-08: DENSITY MEASUREMENT OF LPG

PURPOSE Accurate determination of density / relative density is necessary to convert the

volume into weight of LPG which in turn helps in calculating the safe

quantities that can be filled in a container whose volume is known.

HAZARDS

1) LPG vapour can cause flash fires. Keep away from heat, sparks and open

flames.

2) Use adequate ventilation.

3) Avoid prolonged breathing of vapour.

4) Avoid prolonged skin contact

5) LPG is highly volatile, at high ambient temperatures; sufficient pressure

might generate to burst the cylinder. Therefore after each test, cylinder is

emptied and vents to reduce the pressure to atmospheric in a safe place.

PPE’s Helmet, Safety boot, goggles, hand gloves, mask, non-sparking tools etc.

PREPARATION Thermo Hydrometer apparatus and sample to be measured

STEP BY STEP

PROCEDURE

1. Purge the apparatus with LPG sample to be tested.

2. The thermo-hydrometer cylinder is then filled with a sample to a level at

which the enclosed hydrometer floats freely.

3. Record the hydrometer scale reading, and temperature reading of the

sample.

4. Add meniscus correction of the hydrometer to the observed hydrometer

reading (+ 0006)

5. Convert the corrected hydrometer reading density to 15oC by using ASTM

1250-80 and Measurement Table 23.



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SOP-09: DENSITY & SPECIFIC GRAVITY MEASUREMENT OF

CONDENSATE

PURPOSE Condensate is a byproduct from LPG Recovery Plant. Condensate is sold to

private companies. To monitor its quality Density & Specific Gravity is

Measurement.

HAZARDS

1) Condensate vapour can cause flash fires. Keep away from heat, sparks and

open flames.

2) Use adequate ventilation.

3) Avoid prolonged breathing of vapour.

4) Avoid prolonged skin contact.

PPE’s Helmet, Safety boot, goggles, mask, hand gloves, non-sparking tools etc.

PREPARATION Hydrometer cylinder and sample to be measured

STEP BY STEP

PROCEDURE

1. Transfer about 500 ml of the sample to a hydrometer cylinder with an

inside diameter at least 25 mm greater that the outside diameter of the

hydrometer and a height such that the hydrometer flows in the test position

with at least 25 mm clearance between the bottom of the hydrometer and the

bottom of the cylinder.

2. Remove any air bubble if present, by touching them with a piece of clean

filter paper.

3. Record the hydrometer scale reading, and temperature reading of the

sample.

CALCULATION :

1. Add meniscus correction of the hydrometer to the observed hydrometer

reading (+ 0006)

2. Convert the corrected hydrometer reading density to 15oC (60

0F) by using

ASTM 1250-80 and Measurement Table 23

3. API Gravity is determined by using the conversion table of ASTM-IP

petroleum measurement tables.

The relation between API Gravity at 600F and specific gravity at 60

0F is based

on the following formula:

141.5

API Gravity at 600F = ------------------------------- - 131.5

Specific Gravity at 600F



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SOP-10: DEW POINT MEASUREMENT

PURPOSE

Dew point measurement of Natural gas (feed gas) supplied to LPG Recovery

Plant is carried out for determination of moisture content and dew point

measurement of Dehydrator and Air Compressor Dryer is required to ensure

their performance efficiency.

HAZARDS Care should be taken not to expose the moisture sensor to free condensed

water droplet, which will lead to desensitization & damage of the sensor.

PPE’s Helmet, safety boot, hand gloves, goggles & non-sparking tools etc.

PREPARATION Check battery of the meter

STEP BY STEP

PROCEDURE

1. Before proceeding to the testing site, check battery charge by rotating the

switch pointing to the battery mode. The needle should be in green range of

the indicator dial.

2. If the needle is not in the green mark, i.e., left of the green mark then

change the cell of the Dew point meter.

3. Flush the instrument with atmospheric air several times by moving the Head

assembly up & down manually. Rotate the switch pointing to the autocal

mode. Then Adjust the atmospheric dew point reading by small screwdriver at

0 ± 4(if required) at chamber Head up position. Then press down the Head

assembly and switch off the meter.

4. Connect the inlet tubing of the meter with a suitable connecting point of the

gas line.

5. Open the valve of the gas line in such a way that the Head assembly rises

very slowly if the outlet nozzle of the meter is closed by a finger. Flash the

Sample (at least 3 Times) by closing the outlet nozzle of the meter with a

finger and then pressing down the Head assembly. Allow it to flow at least 3

min at chamber head up position. Rotate the switch pointing to autocal mode.

Note down the steady dial reading for Dew point temperature in oC and water

vapour in ppm at atmospheric pressure.

6. Press down the chamber Head and switch off the meter by rotating the

switch to off mode.

7. Note down the line pressure in psi in the pressure gauge.

8. Convert the reading to Dew point temperature at line pressure using the

‘Dial Calculator’.



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SOP-11: GAS DETECTION BY M 40 GAS DETECTOR

PURPOSE

Gas testing is a simple process to know whether the operating area is charged

with flammable gas or not. In oil field/gas field area there is every possibility

of leakage of natural gas (flammable) which may cause irreversible damage to

installation as well as to precious human life.

HAZARDS No Hazards

PPE’s Helmet, safety boot, hand gloves, goggles, mask etc.

PREPARATION Gas Meter

STEP BY STEP

PROCEDURE

SWITCH ON THE INSTRUMENT

(1) Press and hold button (around one second) till the instrument emits a

short beep (this will activate the LCD screen)

(2) Let the instrument complete a 20 second countdown. (this is

the warm-up cycle of the M40)

(3) When the countdown is completed, M40 will be in its normal

Gas Reading Mode.

(4) Get the inlet port of the M40 close to the point of gas testing and hold it

there till displayed reading in the LCD screen get stabilized.

(5) At 10 LEL to 19 LEL of flammable gas concentration, the instrument will

give a low alarm (continuous single beep)

(6) Above 20 LEL of flammable gas concentration, the instrument will give a

strong alarm (continuous double beep)

(7) Note down the reading displayed on the screen and shut off the instrument

if no further testing is required.

SWITCH OFF THE INSTRUMENT

(1) Press and hold button for five seconds.

(2) Wait the till the instrument beep five times, then the instrument

will automatically shut off.



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SOP-12: ANALYSIS OF NATURAL GAS AND RESIDUAL GAS USING

TRACE ULTRA GAS CHROMATOGRAPH

PURPOSE

Natural Gas from various gas fields are combined at Off Take Point. Analysis

of Natural Gas from OTP is carried out daily for compositional analysis. This

is important for knowing the gas quality, for calculation calorific value and for

controlling the Plant Parameters for optimum recovery of LPG.

After extraction of main product (LPG) and bi-product (Condensate) from

Natural Gas, the Residual gas (main component is methane and ethane) is sent

back to Off Take Point. This gas in turn is supplied to NEEPCO, Power

House, Namrup tea garden etc. Regular analysis of this gas is carried out to

know the gas quality.

HAZARDS Burn when touching the inside of the column oven when the equipment is

running.

PPE’s Apron, non-sparking tool etc.

PREPARATION Select appropriate program in GC and sample for analysis to be made ready

STEP BY STEP

PROCEDURE

I. Analysis

i) Open He gas cylinder and adjust 4 bar at outlet gauge, Switch on all gas

generator and set out let to 4 bar (operate the Hydrogen, Nitrogen and Zero

Air Generators as per respective procedure)

ii) Open all the gas valves of gas panel.

iii) Switch On Power for PC & GC

iv)Switch On Back side switch of GC

v) Double Click on Chrom-Card icon

vi) Double Click on LPG/NGA

vii) Click on File for loading method

viii) Select “LOAD PREDEFINED CONFIGURATION 1”

ix) Click on Edit GC parameter icon (icon no 7 from left)

x) Click on File and select “OPEN”

xi) Select “NGA-TCD+FID_Combine.gcm” under the Folder NGA-LPG

under C-drive

xii) Open this method “NGA-TCD+FID_Combine.gcm”

xiii) Click on “Command” and select “Send Method To Trace”. Now the

method is transferred to GC

xiv) Go to “Sample Table” (icon no 6 from left) for giving identification to the

sample to be analysed.

xv) Then click “OK”

xvi) Click on “View GC Keyboard” (icon no 8 from left) to view

GC parameters.

xvi) Wait for GC stabilization

xvii) Click on ‘Left Detector” to ensure that FID Detector Flame is On and

base temperature is attained (200 deg C)

xviii)Click on ‘Right Detector” to ensure that TCD Detector Flame is On and

block temperature is attained (200 deg C)

xix)When LED glows in “Standby Prep run”, purge the gas sample for at least

2 minutes or more so that sample flushing is proper and then sample purging

is slowed down so that one or two bubbles in one second come out from the

PTFE tubing. xx) Press “Prep Run”



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xxi) When yellow light appears in “Ready to Inject” press “START”

xxii) Now analysis starts and will be completed at 38 mins

xxiii)Analysis result can be obtained from both “TCD+FID output”

(C6,C7,C8,C9 and C10 separately) and “TCD C6+ output” (where C6 to C10

are combined as C6+)

II.Report Generation

Result of the sample analysed can be generated from both “TCD+FID output”

as well as from “TCD C6+ output”

i) “TCD+FID output”

i) Now click on “Reprocessing”.

ii) Again click on “Reprocessing”

iii) All “Integration Options” (7 nos. of options should be ticked).

iv) In “Chromatogram Source” select “Single sample from sequence (last

analysed)”

v)Click OK.

vi) A chromatogram will appear. Close the page

vii) A “Component Table” will appear. Again close the page

viii)“ Report Viewer” page will appear. Close this page and

ix) “Final Result” will appear

x) Select “Print” and result is obtained for TCD+ FID combined

.

ii) “TCD C6+ output”

i) Go to sample table (icon no. 6 from left)

ii) Copy the file name

iii) Close the sample table page

iv) Click “Save”

v) See whether “NGA_combine” is selected

vi) Again Click “Save”. A prompt “ Save Method” appears.

vii) Click “Yes” to replace NGA_LPG\NGA_combine.mth already exist

viii) Click File

ix) Click “Load Method”

x) Select NGA_TCD_C6+.mth . Click Open

xi) Now click on “Reprocessing”.

xii) Again click on “Reprocessing”

xiii) All “Integration Options” (7 nos. of options should be ticked).

xiv) In “Chromatogram Source” select “Single sample (out of sequence)”

xv) Click “Data file Name”

xvi) Paste the file name copied earlier in the data file name option

xvii) Click “Open”

xviii) Click OK.

vi) A chromatogram will appear. Close the page

vii) A “Component Table” will appear. Again close the page

viii)“ Report Viewer” page will appear. Close this page and

ix) “Final Result” will appear

x) Select “Print” and result is obtained for TCD C6+



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SOP-13: ANALYSIS OF LPG USING TRACE ULTRA GAS

CHROMATOGRAPH

PURPOSE The compositional analysis of the final product of LPG sample produced at

LPG RECOVERY PLANT is carried out daily at Quality Control Laboratory

for its quality monitoring & control

HAZARDS Burn when touching the inside of the column oven when the equipment is

running.

PPE’s Apron, non-sparking tool etc.

PREPARATION Select appropriate program in GC and sample for analysis to be made ready

STEP BY STEP

PROCEDURE

I. Analysis

i) Open He gas cylinder and adjust 4 bar at outlet gauge

ii) Switch on all gas generator and set out let to 4 bar (operate the Hydrogen,

Nitrogen and Zero Air Generators as per respective procedure)

iii) Open all the gas valves of gas panel.

iv) Switch On Power for PC & GC

v)Switch On Back side switch of GC

vi) Double Click on Chrom-Card icon

vii) Double Click on LPG/NGA

viii) Click on File for loading method

ix) Select “LOAD PREDEFINED CONFIGURATION 2”

x) Click on Edit GC parameter icon (icon no 7 from left)

xi) Click on File and select “OPEN”

xii) Select “LPG.gcm” under the Folder NGA-LPG under C-drive

xiii) Open this method “LPG.gcm”

xiv) Click on “Command” and select “Send Method To Trace”. Now the

method is transferred to GC

xv) Go to “Sample Table” (icon no 6 from left) for giving identification to the

sample to be analysed.

xvi) Then click “OK”

xvii) Click on “View GC Keyboard” (icon no 8 from left) to view

GC parameters

xviii) Wait for GC stabilization

xix) Click on ‘Left Detector” to ensure that FID Detector Flame is

On and base temperature is attained (200 deg C)

xx) Click on ‘Right Detector’ to ensure that TCD detector is in off

position.

xxi) When LED glows in “Standby Prep run”, purge the liquid sample for at

least 2 minutes or more so that sample flushing is proper and ensure that no

air bubbles are seen ,only liquid flows through the PTFE tubing

xxii) Press “Prep Run”

xxiii) When yellow light appears in “Ready to Inject” press

“START”

xxiv) Now analysis starts and will be completed at 12 minutes



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II. Report Generation

i) When analysis is completed, first of all click on “Save”, Save in

“NGA_LPG” folder in “C- Drive” and select “LPG.mth”.

ii) Now click on “Reprocessing”.

iii) Again click on “Reprocessing”

iv) All “Integration Options” (7 nos.) should be selected.

v) In “Chromatogram Source” select “Single sample from sequence (last

analysed)”

vi)Click OK.

vii) A chromatogram will appear. Close the page

viii) A “Component Table” will appear. Again close the page

ix)“ Report Viewer” page will appear. Close this page and

x) “Final Result” will appear

xi) Select “Print” and result is obtained.



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SOP-14: CONDUCTIVITY MEASUREMENT

PURPOSE To measure conductivity of liquid sample. It is directly proportional to the

dissolved mineral content.

HAZARDS No Hazards


PREPARATION Conductivity meter and sample to be tested

STEP BY STEP

PROCEDURE

1. Switch on the conductivity meter (SensoDirect Con 200).

2. Take 100-150 ml distilled water in a 250 ml beaker & clean the electrode

with this distilled water then wipe it off carefully with tissue paper.

3. Insert electrode in a 250ml beaker containing the sample solution and stir

well.

4. Note down the reading displayed on the screen when it is stabilized after

sometime (The instrument should be in the measuring mode MEAS).

5. Wash the electrode properly with distilled water and dry it with tissue

paper.

6. Switch off the instrument.



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SOP-15: pH MEASUREMENT

PURPOSE pH of any water indicates its acidity & alkalinity.

HAZARDS If pH of the sample is low, skin may get burn


PREPARATION pH meter and sample to be tested

STEP BY STEP

PROCEDURE

1. Switch on the plug switch.

2. Wash the electrode with 50ml distilled water in a 100ml beaker. Wash 2-3

times with fresh distilled water. Dry the electrode with tissue paper.

3. Press and hold the check button. The reading displayed on the screen should

match with the reading obtained after calibration. If the reading differs set the

STANDARDISED control to original reading and go ahead for further

measurements.

4. Take 50 ml of the unknown solution in a 100 ml beaker and note the pH

value measured by the instrument.

5. Wash and dry the electrode as above.

6. Switch off the plug of the instrument.



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SOP-16: PRECISION WEIGHING USING ELECTRONIC BALANCE

PURPOSE pH of any water indicates its acidity & alkalinity.

HAZARDS No Hazards


PREPARATION NA

STEP BY STEP

PROCEDURE

1. Switch on using the ON/OFF button after power ON.

2. The display shows 0.0000g.

3. It must be zeroed prior to weighing using TARE button.

4. If a container is used for taking sample, then the container weight should be

Zeroed first by keeping the container on the weighing pan and taring it again

to zero.

5. Place the sample in the container on the pan.

6. The display shows the weight of the sample in gram.



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SOP-17: CHEMICAL TREATMENT OF RAW & COOLING WATER

PURPOSE

Cooling water is used in LPG Recovery Plant in heat exchangers to cool

different streams to a desired temperature as a part of LPG recovery process.

For best performance of water cooled heat exchangers as well as for

maintaining quality of effluent water , raw and cooling water is monitored and

maintain by regularly adding required quantity of good quality chemicals. The

chemical are added to water for (i) corrosion and scale control (ii) to facilitate

the removal of microbiological slimes (iii) chlorine activator & (iv) a broad-

spectrum biocide to control microbial, fungal and algae growth.

HAZARDS No Hazards

PPE’s Helmet, Safety boot, goggles, mask, hand gloves, etc.

PREPARATION NA

STEP BY STEP

PROCEDURE

INDION 9327: Dosing is done daily @ 1 Kg/day

INDION 9079: Dosing is done daily @ 1 Kg/day

INDION 1611: Dosing is done daily @ 1.5 Kg/day

INDION 9087: Dosing is done daily @ 5 Kg/week

CONTENTS · SITE SPECIFIC SAFE OPERATING PROCEDURE QUALITY CONTROL LABORATORY, ... Doctor Test of...

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