MOJAVE DESERT AIR QUALITY MANAGEMENT DISTRICT
RULE 471 - ASPHALT ROOFING OPERATIONS
(Adopted: 5/5/76; Amended: 9/3/76; Readopted by CARB Ex. Order G-73: 2/1/77; Readopted w/o changes: 7/25/77;
- Purpose: To reduce emissions of volatile organic compounds (VOC) from asphalt or coal tar pitch roofing
- Applicability: This rule shall apply to any person who operates equipment used for melting, heating,
or holding asphalt or coal tar pitch.
For the purposes of this rule, the following definitions shall apply:
- "Asphalt": a brownish-black cementitious material (solid, semi-solid or liquid in consistency)
of which the main constituents are bitumens which occur naturally or are a residue of petroleum refining.
- "Close Fitting Lid": a VOC impermeable cover that fits securely over a roofing kettle or other
container so that no gap exists between the kettle body and lid greater than inch.
- "Coal Tar": a viscous black liquid obtained by the destructive distillation of coal and used
as a raw material for dyes, drugs, and organic chemicals and for waterproofing, paints, roofing, and insulation
- "Coal Tar Pitch": a thick, dark, and sticky substance obtained from the distillation residue
of coal tar.
- "Gap": an opening between a roofing kettle body and the edges of the kettle lid from which
VOC vapors can be emitted to the atmosphere.
- "Roofing Kettle": a device used to heat and melt asphalt or coal tar pitch so that the asphalt
or coal tar pitch can be applied onto a rooftop to provide a protective coating.
- "Roof Transfer Pipe": a pipe or hose that connects to a roofing kettle's pump outlet and serves
to convey hot roofing material from a kettle to a roof.
- "Volatile Organic Compounds (VOC)": any compound of carbon, excluding carbon monoxide, carbon
dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate, which participates in atmospheric
photochemical reactions, excluding those exempt compounds listed in 40 CFR 51.100(s)(1).
- A person shall not operate or use equipment for melting, heating or holding asphalt or coal tar pitch for the
on-site construction, installation or repair of roofs unless:
(a) the vapors from such equipment are contained by one or more close fitting lids. The lid(s) shall not be
opened except for loading the kettle with solid roofing material or unless the material in the roofing kettle is
less than 150F; and
(b) for roofing kettles, the temperature of the material inside is no greater than:
(i) 500F for asphalt; and
(ii) 400F for coal tar pitch.
- During a roofing kettle draining operation, the VOC vapors from the kettle shall be contained by a close fitting
lid. Within 2 minutes after the draining operation has been completed, the vessel that received the hot roofing
material shall be covered with a close fitting lid or capped to prevent the release of visible smoke from the vessel.
- Any kettle vent shall remain closed except during a pressure release caused by flashing of the roofing material.
- A person operating equipment subject to this rule shall provide, properly install and maintain in good working
order, devices capable of correctly indicating and controlling the operating temperatures of such equipment.
- The provisions of this rule shall not apply to equipment having a capacity of 100 liters (26.4 gallons) or
- The provisions of this rule shall not apply to equipment having a capacity of 600 liters (159 gallons) or less
which is equipped with a close fitting lid, except that such equipment shall comply with subsection (C)(1)(a).
(E) Test Methods
The temperature limits specified in this rule shall be measured with a thermometer and shall apply to any location
within the equipment where asphalt or coal tar pitch exists.
(F) Compliance Schedule
- This rule is effective upon December 21, 1994 for all equipment not completed and put into service.
- The owner or operator or any equipment subject to this rule which has been completed and put into service prior
to December 21, 1994 shall comply with all pertinent provisions of the rule by February 1, 1995.