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Publication Title | MARIJUANA EXTRACTION GUIDELINE FOR COMMERCIAL LICENSED FACILITIES

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Text | MARIJUANA EXTRACTION GUIDELINE FOR COMMERCIAL LICENSED FACILITIES | 002



Denver Fire Department

Fire Prevention Division

Marijuana Extraction Guideline Cont.

Site Specific Engineering Report: Site specific engineering reports can be submitted which approve extraction equipment exclusively to a location and specific equipment. A Plant Extraction Systems Operational Permit will be issued for final approval of the extraction equipment and use. Any modification of the equipment or relocation of equipment to a new address voids the equipment approval.

Master Engineering Report – For manufacturers of extraction equipment, a Master Engineering Report can be submittal for approval in lieu of submitting Site Specific reports for every address. Once approved, the report is retained by the Denver Fire Department. Site specific approval letters are then provided by the report Engineer of Record certifying (by location address and serial number) that the equipment on-site meets the approved Master Engineering Report on file. Once this letter is received (and all other extraction room safety provisions are met), a Plant Extraction Systems Operational Permit will be issued for final approval of the extraction equipment and use. Any modification of the equipment or moving addresses voids the equipment approval. See Extractor Approval List document on the Denver Fire Department website for a list of manufacturers with approved Master Engineering reports.

I.B Flammable liquid distillation or evaporative process equipment

There are numerous methods to perform distillation or evaporative extraction / refinement processes. In general, electrified equipment used in these processes are required to be listed by a NRTL for their intended use and are required to be operated within the manufacturer’s guidelines. Equipment such as rotary evaporators are typically listed for distillation processes. Where distillation stills or heated evaporation processes are performed, the heating source shall be listed as explosion-proof (i.e. rated for the electrically classified location) unless it can be shown that the equipment has been tested during its listing to heat flammable liquids without the explosion-proof classification. Approval of the proposed process equipment must be submitted during construction permitting review.

I.C Vacuum Ovens

Vacuum ovens shall not be used to process volatile gases (i.e. alcohol/oil mixtures, oil containing off-gassing LPG, other flammable liquids, etc) unless the vacuum oven is rated to process these vapors (typically an explosion-proof classification). It is the responsibility of the extraction process operator to ensure the material being introduced into the oven does not contain volatiles. All vacuum ovens shall be listed by a NRTL.

I.D Refrigerators

Refrigerated storage or processing of flammable liquids including oil-laden with flammable liquids must only use refrigerators/freezers rated to store flammable liquids. At minimum, a “Lab-Safe” or “Flammable Safe” rated refrigerator/freezer must be used. Residential type refrigerators are not rated by the manufacturer for flammable liquid storage or processing. See NFPA 45 for further information regarding refrigerators used for flammable liquid storage.

Page-2-of 9 Last updated 3/30/2016

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