Heads up: There are no amended sections in this chapter.
About this chapter: Chapter 21 provides provisions that are intended to reduce hazards associated with use of flammable and combustible dry cleaning solvents. These materials, like all volatile organic chemicals, generate significant quantities of static electricity and are thus readily ignitable. Many flammable and nonflammable dry cleaning solvents also possess health hazards when involved in a fire.
Dry cleaning plants and their operations shall comply with the requirements of this chapter.
- Class I solvents are liquids having a flash point below 100°F (38°C).
- Class II solvents are liquids having a flash point at or above 100°F (38°C) and below 140°F (60°C).
- Class IIIA solvents are liquids having a flash point at or above 140°F (60°C) and below 200°F (93°C).
- Class IIIB solvents are liquids having a flash point at or above 200°F (93°C).
- Class IV solvents are liquids classified as nonflammable.
- Type I—systems using Class I solvents.
- Type II—systems using Class II solvents.
- Type III-A—systems using Class IIIA solvents.
- Type III-B—systems using Class IIIB solvents.
- Type IV—systems using Class IV solvents in which dry cleaning is not conducted by the public.
- Type V—systems using Class IV solvents in which dry cleaning is conducted by the public.
Written instructions covering the proper installation and safe operation and use of equipment and solvent shall be given to the buyer.
The manufacturer shall provide nameplates on dry cleaning machines indicating the class of solvent for which each machine is designed.
Filter residue and other residues containing solvent shall be handled and disposed of in covered metal containers.
Lint and refuse shall be removed from traps daily, deposited in approved waste cans, removed from the premises, and disposed of safely. At all other times, traps shall be held securely in place.
Materials to be dry cleaned shall be searched thoroughly and foreign materials, including matches and metallic substances, shall be removed.
In removing materials from the washer, provisions shall be made for minimizing the dripping of solvent on the floor. Where materials are transferred from a washer to a drain tub, a nonferrous metal drip apron shall be placed so that the apron rests on the drain tub and the cylinder of the washer.
A mechanical ventilation system that is designed to exhaust 1 cubic foot of air per minute for each square foot of floor area [0.0058 m3/(s • m2)] shall be installed in dry cleaning rooms and in drying rooms. The ventilation system shall operate automatically when the dry cleaning equipment is in operation and shall have manual controls at an approved location.
Type IV and V dry cleaning systems shall be provided with an automatically activated exhaust ventilation system to maintain an air velocity of not less than 100 feet per minute (0.51 m/s) through the loading door when the door is opened. Such systems for dry cleaning equipment shall comply with the International Mechanical Code.
Exception: Dry cleaning units are not required to be provided with exhaust ventilation where an exhaust hood is installed immediately outside of and above the loading door and operates at an airflow rate as follows:
Q= flow rate exhausted through the hood, cubic feet per minute (m3/s).
ALD = area of the loading door, square feet (m2).
The maximum quantity of Class I solvents permitted at any work station shall be 1 gallon (4 L). Spotting or prespotting shall be permitted to be conducted with Class I solvents where they are stored in and dispensed from approved safety cans or in sealed DOT-approved metal shipping containers of not more than 1-gallon (4 L) capacity.
Spotting and prespotting shall be permitted to be conducted with Class I solvents where dispensed from plastic containers of not more than 1 pint (0.5 L) capacity.
Scouring, brushing, and spotting and pretreating shall be permitted to be conducted with Class II or III solvents. The maximum quantity of Class II or III solvents permitted at any work station shall be 1 gallon (4 L). In other than Group H-2 occupancy, the aggregate quantities of solvents shall not exceed the maximum allowable quantity per control area for use-open system.
Where approved, articles that cannot be washed in the usual washing machines are allowed to be cleaned in scrubbing tubs. Scrubbing tubs shall comply with the following:
- Only Class II or III liquids shall be used.
- The total amount of solvent used in such open containers shall not exceed 3 gallons (11 L).
- Scrubbing tubs shall be secured to the floor.
- Scrubbing tubs shall be provided with permanent 11/2-inch (38 mm) drains. Such drain shall be provided with a trap and shall be connected to an approved container.
Scrubbing tubs, scouring, brushing or spotting operations shall be located such that solvent vapors are captured and exhausted by the ventilating system.
Metal scouring, brushing and spotting tables and scrubbing tubs shall be permanently and effectively bonded and grounded.
Dry cleaning systems, including dry cleaning units, washing machines, stills, drying cabinets, tumblers and their appurtenances, including pumps, piping, valves, filters and solvent coolers, shall be installed and maintained in accordance with NFPA 32. The construction of buildings in which such systems are located shall comply with the requirements of this section and the International Building Code.
Type II dry cleaning and solvent tank storage rooms shall not be located below grade or above the lowest floor level of the building and shall comply with Sections 2107.2.1 through 2107.2.3.
An automatic sprinkler system shall be installed in accordance with Section 903.3.1.1 throughout dry cleaning plants containing Type II, Type III-A or Type III-B dry cleaning systems.
- An automatic sprinkler system shall not be required in Type III-A dry cleaning plants where the aggregate quantity of Class III-A solvent in dry cleaning machines and storage does not exceed 330 gallons (1250 L) and dry cleaning machines are equipped with a feature that will accomplish any one of the following:
- 1.1. Prevent oxygen concentrations from reaching 8 percent or more by volume.
- 1.2. Keep the temperature of the solvent not less than 30°F (16.7°C) below the flash point.
- 1.3. Maintain the solvent vapor concentration at a level lower than 25 percent of the lower explosive limit (LEL).
- 1.4. Utilize equipment approved for use in Class I, Division 2 hazardous locations in accordance with NFPA 70.
- 1.5. Utilize an integrated dry-chemical, clean agent or water-mist automatic fire-extinguishing system designed in accordance with Chapter 9.
- An automatic sprinkler system shall not be required in Type III-B dry cleaning plants where the aggregate quantity of Class III-B solvent in dry cleaning machines and storage does not exceed 3,300 gallons (12 490 L).
Type II dry cleaning units, washer-extractors, and drying tumblers in Type II dry cleaning plants shall be provided with an approved automatic fire-extinguishing system installed and maintained in accordance with Chapter 9.
Portable fire extinguishers shall be selected, installed and maintained in accordance with this section and Section 906. Not fewer than two 2-A:10-B:C portable fire extinguishers shall be provided near the doors inside dry cleaning rooms containing Type II, Type III-A and Type III-B dry cleaning systems.