Source 5 is an LFG-specific model developed by the Gas Technology Institute that predicts the vaporization rate from instantaneous spills and continuous leaks over land or water. Results from Source5 are available in an easy-to-read report.
Included with LFG Fire/Risk
LNG quickly vaporizes upon release, forming a cold, dense gas cloud with a very complex behavior that changes quickly in a short period of time. While DEGADIS is an approved dense-gas model, it lacks the capability to simulate the complicated behavior of LNG as it vaporizes and forms a dense cloud. Source5 was developed by the Gas Technology Institute (GTI, formerly the Gas Research Institute) to specifically handle this behavior. Source5 is an integral part of the BREEZE LFG/Fire Risk package which includes DEGADIS, Source5, and GTI’s LNGFIRE3 thermal radiation models.
Source5 predicts the evaporation rate and spreading of an evaporating LNG release. Spills can be over land or water. The model simulates five different release types:
- Confined instantaneous land spills
- Confined continuous land spills
- Unconfined instantaneous land spills
- Unconfined continuous water spills
- Unconfined instantaneous water spills
Source5 produces output that flows seamlessly into DEGADIS. This allows the analyst to run Source5 and DEGADIS without manually typing results into DEGADIS, which is a time consuming error-prone task. Seamless integration of Source5 into DEGADIS reduces errors and reduces the time required to do your job.
49 CFR 193 requires use of DEGADIS in predicting downwind concentrations of liquefied national gas (LNG) vapors for LNG facility citing and modification. LNG is primarily methane and is typically stored as a liquid at about -260º F.