40 CFR Appendix A to Subpart D of Part 91
Tables
June 9, 2020
Table 1—Symbols Used in Subparts D and E
Open Table
| Symbol | Term | Unit |
|---|---|---|
| AYM | Final weighted emission test results | g/kW-hr |
| C3 H8 | Propane | |
| CB | Concentration of emission in background sample | ppm |
| CD | Concentration of emission in dilute sample | ppm |
| CO | Carbon monoxide | |
| CO2 | Carbon dioxide | |
| conc | Concentration (ppm by volume) | ppm |
| DX | Density of a specific emission (XX) | g/m3 |
| DXX | Volume concentration of a specific emission (XX) on a dry basis | percent |
| DF | Dilution factor of dilute exhaust | |
| D1 | Water vapor mixture concentration | percent |
| f | Engine specific parameter considering atmospheric conditions | |
| GAIRD | Intake air mass flow rate on dry basis | kg/h |
| GFuel | Fuel mass flow rate | kg/h |
| GP | Analyzer standard operating pressure | Pa |
| Gs | Mass of carbon measured during a sampling period | g |
| H | Absolute humidity (water content related to dry air) | gr/kg |
| H2 | Hydrogen | |
| i | Subscript denoting an individual mode | |
| IT | Indicated torque | N-m |
| K | Wet to dry conversion factor | |
| KH | Humidity correction factor | |
| KV | Calibration coefficient for critical flow venturi | |
| MX | Molecular weight of a specific molecule(XX) | g/mole |
| mass | Pollutant mass flow | g/h |
| MFUEL | Mass of fuel consumed during a sampling period | g |
| N | Pump revolutions during test period | revs |
| N2 | Nitrogen | |
| NO | Nitric oxide | |
| NO2 | Nitrogen dioxide | |
| NOX | Oxides of nitrogen | |
| O2 | Oxygen | |
| O2 I | Oxygen concentration of the burner air | percent |
| P | Absolute pressure | kPa |
| PAUX | Declared total power absorbed by auxiliaries fitted for the test | kW |
| PB | Total barometric pressure (average of the pre-test and post-test values) | kPa |
| Pdew | Test ambient saturation vapor pressure at the dew point | kPa |
| Pe | Absolute pump outlet pressure | kPa |
| PED | Pressure drop between the inlet and throat of metering venturi | kPa |
| Pi | Pi = PM, i + PAUX,i | |
| PM | Maximum power measured at the test speed under test conditions | kW |
| PP | Absolute pump inlet pressure | kPa |
| PPI | Inlet pressure depression of venturi or pump | kPa |
| PPO | Pressure head at CVS pump outlet | kPa |
| Ps | Dry atmospheric pressure | kPa |
| PV | Absolute venturi inlet pressure | kPa |
| Pwb | Saturated vapor pressure | Pa |
| QC | Volumetric flow rate of dilute exhaust through CVS at STP | m3/hr |
| QS | Gas flow rate | m3/min |
| RSTP | Ideal gas constant at STP | m3/mole |
| R2 | Fuel carbon weight fraction | g/g |
| STP | Standard temperature and pressure | |
| t | Elapsed time for test period | sec. |
| T | Absolute temperature at air inlet | °C |
| Ta | Ambient temperature | °C |
| TEI | Air temperature in to metering venturi or flowmeter | °C |
| TK | Absolute temperature | K |
| TP | Absolute pump inlet temperature | °C |
| TPI | Air temperature at CVS pump inlet | °C |
| TPO | Air temperature at CVS pump outlet | °C |
| TV | Absolute venturi inlet temperature | °C |
| VO | Pump flow | m3/rev |
| W | Average mass flow of emissions | g/hr |
| WX | Mass rate of specific emission (XX) | g/hr |
| WXX | Volume concentration in exhaust of specific emission (XX) on wet basis | ppm, ppmC, % |
| WF | Weighing factor | |
| Z1 | Water concentration | percent |
| α | Fuel specific factor representing the hydrogen to carbon ratio |
Table 2—Measurement Accuracy Calibration Frequency
Open Table
| No. | Item | Permissible deviation from reading1 | Calibration frequency | |
|---|---|---|---|---|
| non-idle | idle | |||
| 1 | Engine speed | ±2% | ±2% | Monthly. |
| 2 | Torque | ±5% | Monthly. | |
| 3 | Fuel consumption | ±1% | ±5% | Monthly. |
| 4 | Air consumption | ±2% | ±5% | As required. |
| 5 | Coolant temperature | ±2 °C | Same | As required. |
| 6 | Lubricant temperature | ±2 °C | Same | As required. |
| 7 | Exhaust back pressure | ±5% | Same | As required. |
| 8 | Inlet depression | ±5% | Same | As required. |
| 9 | Exhaust gas temperature | ±15 °C | Same | As required. |
| 10 | Air inlet temperature (combustion air) | ±2 °C | Same | As required. |
| 11 | Atmospheric pressure | ±0.5% | Same | As required. |
| 12 | Humidity (combustion air) (relative) | ±3.0% | Same | As required. |
| 13 | Fuel temperature | ±2 °C | Same | As required. |
| 14 | Temperature with regard to dilution system | ±2 °C | Same | As required. |
| 15 | Dilution air humidity | ±3% absolute | Same | As required. |
| 16 | HC analyzer | ±2%2 | Same | Monthly. |
| 17 | CO analyzer | ±2%2 | Same | Monthly. |
| 18 | NOX analyzer | ±2%2 | Same | Monthly. |
| 19 | NOX converter check | 90% | Same | Monthly. |
| 20 | CO2 analyzer | ±2%2 | Same | Monthly. |
1All accuracy requirements pertain to the final recorded value which is inclusive of the data acquisition system.
2If reading is under 100 ppm then the accuracy shall be ±2 ppm.
Table 3—Test Fuel Specifications
Open Table
| Item | Property | Tolerance | Procedure (ASTM)1 |
|---|---|---|---|
| Sulfur, ppm max | 1000 | D 2622 | |
| Benzene, max. percent | 1.5 | D 3606 | |
| RVP, psi | 8.6 | ±0.6 | D 323 |
| Octane, R + M/2 | 89.9 | ±3.1 | D 2699 D 2700 |
| IBP, °C | 32.8 | ±11.0 | D 86 |
| 10% point, °C | 53.3 | ±5.5 | D 86 |
| 50% point, °C | 101.7 | ±8.3 | D 86 |
| 90% point, °C | 160.0 | ±11.1 | D 86 |
| End Point, max. °C | 212.8 | D 86 | |
| Phosphorus, g/l, max | 0.02 | D 3231 | |
| Lead, g/l, max | 0.02 | ||
| Manganese, g/l, max | 0.004 | ||
| Aromatics, max. percent | 35 | D 1319 | |
| Olefins, max. percent | 10 | D 1319 | |
| Saturates, percent | remain | D 1319 |
1All ASTM Procedures in this table have been incorporated by reference. See §91.6.
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