Garrett Gas Train Kit (H2S/CO2)

MUD TESTING EQUIPMENT

For years, Inmotion Energy has supplied
precision instruments and drilling tools for
testing drilling fluids, well cements, and
completion fluids.

From our Bangalore facility, we provide
customers across India and the Middle East
with quality products and exceptional
service.

As an independent manufacturer, we have one priority: our customers.

INDUSTRIES WE SERVE

— Onshore & offshore drilling contractors
— National & independent oil companies
— Mud engineering & testing laboratories
— Well completion & workover operations

WHY CHOOSE US

— Rigorous quality control on every unit
— Fast turnaround on spares &
replacements
— Field-tested designs, built for uptime

INMOTION ENERGY (OPC) PRIVATE LIMITED

PRODUCT SPECIFICATION — Garrett Gas Train Kit (H2S/CO2)

Model: IM-GGT-RHS2 Compliance / target standard: API RP 13B-1 Sec. 12

The Garrett Gas Train (GGT) is the standard portable instrument for measuring soluble sulfides and carbonates in drilling fluid filtrate. It is a transparent block with three interconnected chambers. The filtrate is acidified in the first chamber, converting sulfides to H2S or carbonates to CO2; a carrier gas sweeps the released gas through the train and through a detector tube in the third chamber, whose stain length is proportional to the concentration. The device was developed by R. L. Garrett at Exxon Production Research.

Figure 8. Reference photograph of the Garrett Gas Train Kit (H2S/CO2), with the three-chamber gas train, dual regulator, flowmeters, detector tubes and carrying case. Components are listed on page 2

Intended applications

• Quantitative measurement of soluble sulfides in water-based mud filtrate when drilling sour formations.
• Measuring total soluble carbonates (CO2, carbonate, bicarbonate) for contamination diagnosis.
• Monitoring sulfide-scavenger treatments such as zinc-based products.
• Qualitative H2S check using lead-acetate paper.

FEATURES

• Clear acrylic block (about 2.5 x 4 x 6 in) with three interconnected chambers.
• Regulator and carrier-gas cartridges for portable operation.
• Hand pump / gas bag and detector tubes for H2S and CO2.
• Septum injection port for syringe sampling.
• Complete carrying case with spare seals and reagents.

TECHNICAL SPECIFICATIONS

Method	Acidification, gas stripping and detector-tube measurement
Chambers	3 interconnected chambers in an acrylic block
Analytes	Soluble sulfides (H2S, HS-, S2-); total soluble carbonates
Sample	Solids-free filtrate, injected by syringe through the septum
Reagents	Sulfuric acid (about 5 N), deionised water, octanol defoamer
Detectors	H2S and CO2 detector tubes; lead-acetate paper (qualitative)
Carrier Gas	Gas cartridges via low-pressure regulator

Values are typical for this equipment class based on API/ASTM practice and manufacturer literature (OFITE, Fann, Chandler); confirm against the Inmotion datasheet before use in a certificate or specification.

Main components (see Figure 8)

No.	Component
1	Septum and syringe
2	Lid and thumb screws
3	Chamber 1: sample and acid
4	Chamber 2: gas transfer
5	Regulator and carrier-gas cartridge
6	Chamber 3 with detector tube

Principle of operation

Filtrate is injected into the first chamber, which contains water and defoamer, and is acidified with sulfuric acid. At low pH the soluble sulfide species are converted to H2S gas (or carbonates to CO2). A carrier gas transports the liberated gas through the chambers to the detector tube; the discoloured length of the tube is read and converted to a concentration in mg/L using the tube factor and the filtrate volume.

Basic operating procedure

1. Clean and dry the train; add deionised water and a few drops of defoamer to chamber 1.
2. Fit the correct detector tube (H2S or CO2) and the required paper or fill in the other chambers as described by
the standard.
3. Close the lid and connect the carrier-gas regulator; flush the train briefly.
4. Inject the measured filtrate volume through the septum, then inject sulfuric acid.
5. Start the gas flow and draw gas through the detector tube for the specified time.
6. Read the stain length, calculate the concentration from the tube factor and sample volume, then flush and clean
the train.

Calibration and maintenance

• Replace O-rings and septa when cracked or leaking.
• Clean chambers with mild detergent and rinse thoroughly; never use solvents that attack acrylic.
• Check detector-tube expiry dates and store tubes as recommended.
• Test the train for leaks before each series of tests.

Safety precautions

• H2S is toxic and flammable: work in a well-ventilated area and follow site H2S procedures.
• Sulfuric acid is corrosive: wear gloves, goggles and protective clothing.
• Dispose of spent detector tubes and acid solutions in accordance with local rules.

Reference sources