Table 3 - Symbols and subscripts for terms and variables used in the formulae for the test-bed measurement methods
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Statutory Documents - IMO Publications and Documents - Circulars - Marine Environment Protection Committee - MEPC/Circular.473 – Approved Unified Interpretations to MARPOL Annex VI and the NOx Technical Code – (29 July 2005) - Annex - Unified Interpretations to MARPOL Annex VI And the NOx Technical Code - Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines (NOx Technical Code) - Table 3 - Symbols and subscripts for terms and variables used in the formulae for the test-bed measurement methods

Table 3 - Symbols and subscripts for terms and variables used in the formulae for the test-bed measurement methods

Parent topic: Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines (NOx Technical Code)

Table 3 gives:

Symbol Term Dimension
pa Saturation vapour pressure of the engine intake air (in ISO 3046-1, 1995: psy = PSY, test ambient vapour pressure) kPa
pB Total barometric pressure (in ISO 3046-1, 1995: px = PX, site ambient total pressure; py = PY, test ambient total pressure) kPa
ps Dry atmospheric pressure kPa
Ra Relative humidity of the intake air %
Ta Absolute temperature of the intake air K

Interpretation:

 For application of the term "ps " it should be interpreted that the dry atmospheric pressure is determined in accordance with the following formula:

It should also be interpreted that the pa term be determined using a temperature value for the intake air determined at the same physical location as the measurements for p B and Ra .

Interpretation:

 For application of the term "Ta " it should be interpreted that the temperature of the intake air temperature is that determined at the engine/turbocharger intake suction filter.

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