Section 250-RICR-120-05-36.10 - Requirements for Batch Vapor Cleaning Machine Operations with Solvent/Air InterfacesA. Vapor cleaning machines shall be equipped with a cover that can be easily operated without disturbing the vapor zone and that is attached to the vapor cleaning machine. Covers must be closed at all times except during parts entry and removal. Covers must be free of cracks, holes, and other defects. If the batch vapor cleaning machine is equipped with a lip exhaust, the cover must be located below the lip exhaust.B. Each vapor cleaning machine shall be equipped with a primary condenser.C. Each vapor cleaning machine, except those exempted as specified in § 36.16 of this Part, which uses a solvent containing trichloroethylene, perchloroethylene, 1,1,1-trichloroethane, methylene chloride, chloroform, trans 1,2-dichloroethene, n-propyl bromide, or carbon tetrachloride or any combination of halogenated HAP solvents, as defined in § 36.5(A)(21) of this Part, in a total concentration of greater than five percent (5%) by weight shall be equipped with an automated parts handling system, such as, but not limited to, a hoist or conveyor, that maintains a vertical conveyor speed of less than two inches (2") per second (ten feet (10') per minute).D. Each vapor cleaning machine must be equipped with the following safety switches: 1. A condenser flow switch and thermostat to shut off the heat to the solvent if the condenser coolant is not circulating; and2. A vapor level control thermostat to shut off the heat when the vapor level rises above the height of the primary cooling coils; and3. If the cleaning machine is equipped with a spray apparatus, a spray safety switch to shut off the spray pump if the vapor level drops more than four inches (4") (ten (10) cm) from the bottom of the primary condenser coil and to prevent spraying outside the vapor level; and4. A low solvent level safety switch to shut off the heating element if it should become exposed.E. Each vapor cleaning machine shall have a freeboard ratio of at least seventy-five one hundredths (0.75).F. Any vapor cleaning machine that has a solvent/air interface of thirteen (13) square feet (one and twenty-one one hundredths (1.21) square meters) or less and uses a solvent containing trichloroethylene, perchloroethylene, 1,1,1 -trichloroethane, methylene chloride, chloroform, trans 1,2-dichloroethene, n-propyl bromide, or carbon tetrachloride or any combination of halogenated HAP solvents, as defined in § 36.5(A)(22) of this Part, in a total concentration of greater than five percent (5%) by weight, must be equipped with one (1) of the following control combinations: 1. Refrigerated freeboard chiller and superheated vapor system; or2. Refrigerated freeboard chiller and freeboard ratio of at least one (1.0); or3. Refrigerated freeboard chiller and carbon adsorber; or4. Refrigerated freeboard chiller and dwell; or5. Another system of equivalent control that is approved by the Director and the EPA. Requests for equivalency determinations, must be submitted and approved prior to startup of the cleaning machine. Requests shall include the following information: a. A complete description of process and control equipment;b. Testing procedures that will be used to demonstrate equivalency; and c. The date, time and location of the equivalency test.G. Any vapor cleaning machine that has a solvent/air interface of greater than thirteen (13) square feet (one and twenty-one one hundredths (1.21) square meters) and uses a solvent containing trichloroethylene, perchloroethylene, 1,1,1-trichloroethane, methylene chloride, chloroform, trans 1,2-dichloroethene, n-propyl bromide, or carbon tetrachloride or any combination of halogenated HAP solvents, as defined in § 36.5(A)(22) of this Part, in a total concentration of greater than five percent (5%) by weight, must be equipped with one of the following control combinations: 1. Refrigerated freeboard chiller, freeboard ratio of at least one (1.0), and superheated vapor system; or2. Refrigerated freeboard chiller, superheated vapor system, and carbon adsorber; or3. Another system of equivalent control that is approved by the Director and the EPA. Requests for equivalency must be submitted and approved prior to startup of the cleaning machine. Requests shall include the following information: a. A complete description of process and control equipment;b. Testing procedures that will be used to demonstrate equivalency; and c. The date, time, and location of the equivalency test.H. Pieces shall be held in the vapor zone for at least thirty (30) seconds or until condensation ceases, whichever is longer.I. The workload shall not occupy more than half of the cleaning machine's open top area.J. The vapor level shall not rise or drop more than four inches (4") (ten (10) cm) when the workload enters or is removed from the vapor zone. K. Sprays shall be used only within the vapor zone.L. Cleaning machines shall be operated so that water cannot be visually detected in the solvent exiting the water separator.M. Each cleaning machine that uses a lip exhaust shall be designed and operated to route all collected solvent vapors through a properly operated and maintained carbon adsorber that meets the requirements of § 36.13(A)(5) of this Part.N. The exhaust ventilation rate shall not exceed twenty (20) m3/min per m2 (sixty-five (65) cfm per ft2) of solvent/air interface, unless necessary to meet OSHA requirements. If a carbon adsorber is used to meet the requirements of §§ 36.10(F) or (G) of this Part, the exhaust ventilation rate shall be at least fifteen (15) m3/min per m2 (fifty (50) cfm per ft2) of solvent/air interface.O. During startup of each vapor cleaning machine, the primary condenser shall be turned on before the sump heater.P. During shutdown of each vapor cleaning machine, the sump heater shall be turned off and the solvent vapor layer allowed to collapse before the primary condenser is turned off.Q. To minimize solvent carry-out, pieces shall be removed from the vapor cleaning machine at a rate less than two inches (2") per second (ten feet (10') per minute).250 R.I. Code R. 250-RICR-120-05-36.10
Adopted effective 1/13/2019
Amended effective 6/13/2022