Gas Management Best Practices By Omar Zourob

8/7/2019 Gas Management Best Practices By Omar Zourob

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Gas Management

Best Practices

Expert Omar Zourob

1Expert OMAR ZOUROB


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2Expert OMAR ZOUROB

Gas types used for Gas Chromatography:

Helium

Hydrogen

Nitrogen

Air

Argon

Introduction:


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3Expert OMAR ZOUROB

Gas Cylinders most common

Gas Generators

Piped-in Gas

Key considerations for gas cylinders: they should never be

allowed to run dry, due to increased contaminant

concentration in the gas.

Gas Sources:


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4Expert OMAR ZOUROB

See a demo of the low gas alarm system

Low gas alarm part numbers:

2.0 in. stand-alone: G7311A

2.5 in. stand-alone: G3377A

2.0 in. wireless*: G3374A

2.5 in. wireless*: G3378A

2.0 in. wireless with Lab Network Controller (LNC)*:

G3376A

2.5 in. wireless with LNC*: G

3379A

*Not available in all countries, due to regulatory

requirements.


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Impurities in gases can be measured in the "parts

per billion" you won't see them, but they still

impact your chromatography.

Impurities in your gas can:

Degrade your column

Interfere with your analysis

Agilent sells a number of gas purifiers and systems... go to

www.agilent.com/chem/purifierselection

Gas Purity


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Do not use plastic, rubber or Teflon tubing.

Minimize connections, so that you minimize the

opportunities for system leaks

We Recommended Leak Detector and don't

recommend liquid leak detectors, which can

contaminate the system.

Connecting your Gas Source :


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Pointers for gas filters:

Always install traps in a vertical position

Metal or glass body traps are best

There should be no o-rings in the gas flow path

Connecting your Gas Source :


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Regulators are selected by the CGA number

(Compressed Gas Association).

The carrier supply pressure regulator must

be set at least 20 PSI higher than the

pressure required for the GC method.

Always use high-quality PTFE

tape to prepthe regulator.

Selecting your Regulator


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9Expert OMAR ZOUROB

Purge the air from the regulator by repeating these steps

five times:

Turn the regulator knob fully counterclockwise

Open the Tank Main Valve, pressurizing the

primary side of the regulator

Turn OFF the Tank Main Valve

Turn the Regulator Knob clockwise, slowlybleeding off the gas pressure

Purging the Regulator


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10Expert OMAR ZOUROB

Types of Purifiers and How Its Work

It is important to place single-component traps in

the right order from the source to the GC:

Moisture traps remove residual water from thecarrier gas

Hydrocarbon traps remove hydrocarbons

Oxygen traps remove oxygen from the gas,

which can rapidly degrade the GC column

(indicated by increased column bleed)


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Indicating traps keep you informed of system

purification performance and need for

replacement.

Combination traps -- often large capacity, have

several sorbents in one cartridge to trap various

contaminants.One Big Universal Trap will purify the contents of

13 "K" cylinders of 99.997% purity helium to a

cumulative level of 100 parts per billion of O2,

H2O, CO2, CO and hydrocarbons at a flow rate ofup to 8 liters/minute.


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New Multi-purpose Cartridge systems.

Manifold systems with purifier in cartridge

designed for easy replacement

Manifold fittings prevent air from diffusing into

gas line during cartridge change

Agilent's Renewable Gas Purifier combines the

sorbents to capture moisture, oxygen andhydrocarbons. It has easy-to-read indicators and

it's recyclable.

Agilent's Renewable Gas Purifier


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Highest capacity 850cc or more Oxygen

filtration, 12 g H2O and approx. 8 g hydrocarbon

filtration - in a compact cartridge

Agilent's most economical purification system

One purifier can support up to four GC systems

Cartridges can be returned for recycling

Startup kit: part number G3440-60004

Replacement cartridge: part number G3440-60003

or G3440-69003

C


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FID: need to filter out hydrocarbons

ECD: need to filter out moisture, hydrocarbons

and oxygen

MS: use combination trap, followed by

indicating trap, or a system like the Renewable.

Gas Purifiers Maintenance

Keep a log book to keep track of when traps are

installed and replacement is due.

Gas purification needs for detectors


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It's important to check for leaks in the system whenever you

change a cylinder or purifier.

The G3388A Electronic Leak Detector has audible and

visual alerts for leaks as small as 0.01 ml/min.

LeakTest Choices


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Purging the Gas System

Purge your system with carrier gas whenever you

open or change cylinders or traps, or change a

column.

Purge the system by pressurizing the injection port,

confirming column flow and then purging the

column with the carrier gas for five minutes beforeheating the oven.

Good GC Management Tip:


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Key gas management tips:

Never let your cylinder gas run to empty

Purge your gas supply system when turning onthe GC, or changing cylinders or traps

Use purifiers for your gas source to ensure

purity, even if you are using higher-quality gas

New cartridge-style gas purifiers save you

hassle, and ours is recyclable

Summary


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Minimize gas line connections, to minimize

opportunities for leaks

Maintain your purifiers and gas lines regularly

Keep purifiers vertically oriented

Helpful tools for your gas management:

Low Gas Alarm

Renewable Gas Purifier Electronic Leak Detector

Precision Flow Meter

Summary

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Gas Management Best Practices By Omar Zourob