Appendix A to Subpart D of Part 91 - Tables

Appendix A to Subpart D of Part 91 - Tables

Table 1 - Symbols Used in Subparts D and E

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

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.

¹ All accuracy requirements pertain to the final recorded value which is inclusive of the data acquisition system.

² If reading is under 100 ppm then the accuracy shall be ±2 ppm.

Table 3 - Test Fuel Specifications

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

¹ All ASTM Procedures in this table have been incorporated by reference. See § 91.6.