Stack Sampling

Type of Sample

Gas containing particulates

Standard Design Pressure

Generally atmospheric or near-atmospheric

Standard Design Temperature -25 to 1500°F (-32 to 815°C)

Sample Velocity

400 to 10,000 ft (120 to 3000 m) per minute

Materials of Construction

316 or 304 stainless steel for pitot tubes; 304 or 316 stainless, quartz, or Incoloy for sample probes

Partial List of Suppliers

Andersen Samplers, Inc.; Applied Automation/Hartmann & Braun Process Control Systems Div.; Bacharach, Inc.; Columbia Scientific Industries Corp.; Cosa Instruments; Gastech, Inc.; Mine Safety

Appliance Co., Instrument Division; Sensidyne, Inc. Gas & Particulate Detection Systems; Scientific Glass & Instruments Inc.; Sierra Monitor Corp.; Teledyne Analytical Instrument, Teledyne Inc.

A complete EPA particulate sampling system (reference method 5) is comprised of the following four subsystems (U.S. EPA 1971; 1974; 1977; 1987; 1989; 1991; Morrow, Brief, and Bertrand 1972):

1. A pitot tube probe or pitobe assembly for temperature and velocity measurements and for sampling

2. A two-module sampling unit that consists of a separate heated compartment with provisions for a filter assembly and a separate ice-bath compartment for the impinger train and bubblers

Partial List of Suppliers

Andersen Samplers, Inc.; Applied Automation/Hartmann & Braun Process Control Systems Div.; Bacharach, Inc.; Columbia Scientific Industries Corp.; Cosa Instruments; Gastech, Inc.; Mine Safety

FIG. 5.11.1 (Top) EPA particulate sampling train (reference method 5); (Bottom) Sampling case for SO2, SO3, and H2SO4 mist (reference method 8). (Reprinted from Federal Register 36, nos. 234 and 247.)

3. An operating or control unit with a vacuum pump and a standard dry gas meter

4. An integrated, modular umbilical cord that connects the sample unit and pitobe to the control unit.

Figure 5.11.1 is a schematic of a U.S. EPA particulate sampling train (reference method 5). As shown in the figure, the system can be readily adapted for sampling sulfur dioxide (SO2), sulfur trioxide (SO3), and sulfuric acid (H2SO4) mist (reference method 8) (U.S. EPA 1971; 1977).

This section gives a detailed description of each of the four subsystems.

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