Reference Method for Source Testing: Measurement of Releases of Gaseous Hydrogen Chloride from Stationary Sources

• 3.1 Hydrogen Chloride Sampling Train
• 3.2 Integrated Bag Sampling Train
• 3.3 Sample Preparation and Recovery

3.1 Hydrogen Chloride Sampling Train (Figure 1)

Figure 1: Hydrogen Chloride Sampling Train

The following equipment is required:

Probe:

A borosilicate glass liner, approximately 13 mm inside diameter, encased in a stainless steel tube with a heating system capable of maintaining an exit gas temperature greater than 120°C, or the acid dew point of the sample gas, whichever is greater. A fine wool plug (quartz or borosilicate) is inserted at the liner inlet for particulate removal.

Pitot Tube:

A calibrated S-type pitot tube, or equivalent, to measure the velocity pressure of the stack gas.

Inclined Manometer:

An inclined manometer, or equivalent, capable of measuring the pitot velocity pressure to within 0.1 mm H₂O (0.004 inch H₂O) on the 0-25 mm H₂O (0-1 inch H₂O) scale.

Stopcock:

A three-way T-bore stopcock valve with 12/5 spherical joints compatible with midget impingers. This valve permits purging the probe, "leak-checking" the train, and sampling the flue gas.

Rubber Bulb:

A one-way rubber squeeze-bulb to purge the sample probe.

Midget Bubbler:

One 25-mL midget bubbler with 12/5 ball joints.

Midget Impingers:

Three 25-mL midget impingers.

Drying Tube:

A tube packed with 6-16 mesh indicating-type silica gel.

Vacuum Pump:

A leak-proof vacuum pump to draw the gas sample.

Control Valve:

A needle valve to control the sample flow rate.

Rotameter:

A calibrated rotameter with a range of 1 to 5 L/min to measure the sampling rate.

Dry Gas Meter:

A calibrated dry gas meter capable of measuring the sample volume to within one percent. This meter shall be temperature compensated or equipped with temperature indicators.

Barometer:

A barometer able to measure the atmospheric pressure to within 0.35 kPa (0.1 inch mercury (Hg)).

3.2 Integrated Bag Sampling Train (Figure 2)

Figure 2: Integrated Bag Sampling Train

The following equipment is required:

Probe:

A stainless steel or Pyrex probe equipped with a filter to remove particulate matter.

Condenser

An air-cooled condenser to remove excess moisture.

Control Valve

A needle valve to adjust the sample flow rate.

Pump

A leak-proof diaphragm-type pump to pull the sample gas.

Flexible Bag

A flexible bag of inert material such as Tedlar with a capacity of approximately 30 to 40 L.

Analyzer

A portable chromatograph, Orsat analyzer or electronic combustion analyzer to analyze the collected sample gas for carbon dioxide and oxygen.

3.3 Sample Preparation and Recovery

The following equipment is required:

Graduated Cylinder

A graduated cylinder with 1-mL divisions.

Vacuum Grease

High vacuum, high-temperature, inert stopcock grease.

Squeeze Bottles

Polyethylene or equivalent squeeze bottles to rinse the train glassware.

Storage Bottles

Polyethylene or equivalent storage bottles with 125-mL capacity and leak-free caps.

Analytical Balance

A balance capable of measuring to within 0.1 g.