Appendix A to Subpart D of Part 90 - Tables

Appendix A to Subpart D of Part 90 - Tables

Table 1 - Symbols Used in Subpart D

Symbol	Term	Unit
CO	Carbon monoxide
CO2	Carbon dioxide
NO	Nitric oxide
NO2	Nitrogen dioxide
NOX	Oxides of nitrogen
O2	Oxygen
conc	Concentration (ppm by volume)	ppm
f	Engine specific parameter considering atmospheric conditions
FFCB	Fuel specific factor for the carbon balance calculation
FFD	Fuel specific factor for exhaust flow calculation on dry basis
FFH	Fuel specific factor representing the hydrogen to carbon ratio
FFW	Fuel specific factor for exhaust flow calculation on wet basis
GAIRW	Intake air mass flow rate on wet basis	kg/h
GAIRD	Intake air mass flow rate on dry basis	kg/h
GEXHW	Exhaust gas mass flow rate on wet basis	kg/h
GFuel	Fuel mass flow rate	kg/h
H	Absolute humidity (water content related to dry air)	gr/kg
i	Subscript denoting an individual mode
KH	Humidity correction factor
L	Percent torque related to maximum torque for the test mode	percent
mass	Pollutant mass flow	g/h
nd, i	Engine speed (average at the i'th mode during the cycle)	1/min
Ps	Dry atmospheric pressure	kPa
Pd	Test ambient saturation vapor pressure at ambient temperature	kPa
P	Gross power output uncorrected	kW
PAUX	Declared total power absorbed by auxiliaries fitted for the test	kW
PM	Maximum power measured at the test speed under test conditions	kW
Pi	Pi = PM, i + PAUX, i
PB	Total barometric pressure (average of the pre-test and post-test values)	kPa
Ra	Relative humidity of the ambient air	percent
T	Absolute temperature at air inlet	C
Tbe	Air temperature after the charge air cooler (if applicable) (average)	C
Tclout	Coolant temperature outlet (average)	C
TDd	Absolute dew point temperature	C
Td, i	Torque (average at the i'th mode during the cycle)	N-m
TSC	Temperature of the intercooled air	C
Tref	Reference temperature	C
VEXHD	Exhaust gas volume flow rate on dry basis	m3/h
VAIRW	Intake air volume flow rate on wet basis	m3/h
PB	Total barometric pressure	kPa
VEXHW	Exhaust gas volume flow rate on wet basis	m3/h
WF	Weighing factor
WFE	Effective weighing factor

Table 2 - Measurement Calibration Accuracy and Frequency

No.	Item	Permissible deviation from reading *		Calibration frequency
		Non-idle	Idle
1	Engine speed	±2 %	Same	Monthly or within one month prior to the certification test.
2	Torque	±2 %		Monthly or within one month prior to the certification test.
3	Fuel consumption	±2 %	±5%	Monthly or within one month prior to the certification test.
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 %**	Same	Monthly or within one month prior to the certification test.
17	CO analyzer	±2 % **	Same	Monthly or within one month prior to the certification test.
18	NOX analyzer	±2 % **	Same	Monthly or within one month prior to the certification test.
19	NOX converter check	90 %	Same	Monthly or within one month prior to the certification test.
20	CO2 analyzer	±2 % **	Same	Monthly or within one month prior to the certification test.

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

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

Table 3 - Test Fuel Specifications

Item	Property	Tolerances	Procedure (ASTM)1
Sulfur, ppm max.	339		D 2622-92
Benzene, max. %	1.5		D 3606-92
RVP, psi	8.7	±0.2	D 5191-93a
Octane, R + M/2	87.3	±0.5	D 2699-92 D 2700-92
IBP, °C	32.8	±11.0	D 86-93
10 % point, °C	53.3	±5.5	D 86-93
50 % point, °C	103.3	±5.5	D 86-93
90 % point, °C	165.6	±5.5	D 86-93
End Point, max. °C	212.8		D 86-93
Phosphorus, g/liter, max.	0.02		D 3231-89
Lead, g/liter, max.	0.02
Manganese, g/liter, max.	0.004
Aromatics, %	32.0	±4.0	D 1319-89
Olefins, %	9.2	±4.0	D 1319-89
Saturates, %	Remainder		D 1319-89

¹ All ASTM procedures in this table have been incorporated by reference. See § 90.7.