Emissions Calculations Features vs. LeakDAS – LDARtools

Feature	Chateau	LeakDAS
Store Emission Models so you don’t have the “remember” settings from previous period(s)	Yes	No
Customize and track credits	Yes	No
Auto normalize chemical speciation to correctly handle streams with known nonVOC chemicals	Yes	No
Ethylene factor auto applied based on chemical	BETA	No
Ability to interpolate pegged emission rate between 10,000 and 100,000, if necessary	Yes	No
If previous inspection has higher PPM then emits at that rate even if non-Retest inspections indicate lower ppm values *1	No	Yes
Lookback uses Inspection date not end of period *2	Yes	No
Customizable lookback periods	Yes	No
Verify that 50% of connectors have been monitored in order to qualify for calculated averaged emissions factors	Yes	No
Alternate Factor set available for chemical streams in a Refinery(MTBE)	Yes	No
Customizable PPM for failed Visual and OGI(midpoint only)	Yes	No

In LeakDAS, for all inspection intervals, if the second PPM event between two inspections has a lower PPM, then LeakDAS uses the higher PPM to determine the emission rate. This follows the 1994 Emission Estimation Protocol. Chateau only applies this rule for Retests, which aligns with the 2015 Emissions Estimation Protocol update for Petroleum Refineries.
If a LookBackPPM event occurred on 9/1/15 and the start date for the reporting period is 1/1/16, LeakDAS calculates the slope (emission rate) for the lookback PPM as if it occurred on 1/1/16. Chateau will calculate the slope using the modified trapezoidal method and determine the emission rate as of 1/1/16. See the following Reach Back and Reach Forward example.

Related articles