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# PART 75 CEMS FIELD AUDIT MANUAL: - page 30 / 41

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Appendix A                                                                                Flow RATA Observation Sheet

8.  Reference Method 2 Calculations

Molecular Weight of Stack Gas

Ms=  Md (1 - Bws) + 18.0 Bws

Average Stack Gas Velocity

Average Stack Gas Volumetric Flow Rate

A= Cross-sectional area of stack, m2 (ft2).

Bws=Water vapor in the gas stream [from Method 4 (reference method) or Method 5],  proportion by volume.

Cp=Pitot tube coefficient, dimensionless.

Kp=Velocity equation constant (English Units = 85.49)

Md=Molecular weight of stack gas, dry basis (see Section 8.6), g/g-mole (lb/lb-mole).

Ms=Molecular weight of stack gas, wet basis, g/g-mole (lb/lb-mole).

Pg=Stack static pressure,(in. Hg).

Ps=Absolute stack pressure (Pbar + Pg),(in. Hg),

Pstd=Standard absolute pressure,(29.92 in. Hg).

Q=Volumetric stack gas flow rate corrected to standard conditions (scf/hr).

Ts=Stack temperature,(F).

Ts(abs) = Absolute stack temperature,(R) (460 + Ts)

Tstd=Standard absolute temperature, (528 R). conditions,

vs=Average stack gas velocity, m/sec (ft/sec).

W=  Width.

Δp=Velocity head of stack gas,(in. H20).

3600 =Conversion Factor, sec/hr.

Part 75 Field Audit Manual - July 16, 2003                                                                                                      Page A-26

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