calcTier.Rd
Estimate engine NOx tier from the vessel's keel-laid year for C3 vessels.
calcTier(engineType, keelLaidYear, shipCategory)
engineType | Engine type (vector of strings) (see
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---|---|
keelLaidYear | Keel-laid year (vector of ints). If not available, interpolate from build date |
shipCategory | Ship category (vector of ints) (see
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tier
, a factorized vector with possible levels of:
"None" (used for C1/C2 vessels)
"Tier 0"
"Tier 1"
"Tier 2"
"Tier 3"
This function is designed to determine the engine NOx tier for C3 vessels. Therefore, it will return "None" for C1 or C2 vessels.
"Tier 0" is returned for steam turbine, gas turbine, and LNG engines, as well as for diesel engines that were keel-laid prior to Tier 1 taking effect (2000).
"Tier 1", "Tier 2", and "Tier 3" refer to Tier I, Tier II, and Tier III, respectively.
#> [1] Tier 0 Tier 0 Tier 0 None #> Levels: None Tier 0