Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 120 - Air Resources › Subchapter 05 - Air Pollution Control › Part 36 - Control of Emissions from Organic Solvent Cleaning › Section 250-RICR-120-05-36.13 - Compliance Specifications and Monitoring Requirements for Solvent Cleaning Machines

Current through June 14, 2024
A. The owner or
				  operator of a solvent cleaning machine shall monitor the following parameters
				  and record the results:
1. The cover of each
				  batch vapor or in-line cleaning machine shall be visually inspected monthly to
				  confirm that it is opening and closing properly, that it completely covers the
				  cleaning machine's openings when closed, and that it is free of cracks, holes,
				  and other defects.
2. The speed of
				  automated parts handling systems shall be monitored according to the following
				  specifications:
a. Determine the speed by
				  measuring the time it takes for the conveyor to travel a measured distance. The
				  speed is the distance in inches divided by the time in seconds, or the distance
				  in feet divided by the time in minutes; and
b. Monitoring shall be performed on a monthly
				  basis. If no exceedances of the speed requirements specified in §§
												36.10(C) 
				  and 36.11(C)
				  of this Part occur in a year, then future hoist speed monitoring may be
				  conducted on a quarterly basis; and
c. If a speed greater than that specified in
				  §§
												36.10(C) 
				  and 36.11(C)
				  of this Part is measured, the automated parts handling system must be adjusted
				  so that this specification is met; and
d. If a speed greater than that specified in
				  §§
												36.10(C) 
				  and 36.11(C)
				  of this Part is measured while monitoring is being conducted on a quarterly
				  basis, then monthly monitoring must be resumed until another year passes
				  without any exceedances.
3. If a refrigerated freeboard chiller is
				  used, the temperature at the coldest point of the centroid of the chilled air
				  blanket shall be no greater than thirty percent (30%) of the solvent's boiling
				  point, measured in degrees Fahrenheit (° F), and shall be monitored weekly
				  according to the following specifications:
a.
				  The temperature shall be monitored while the batch vapor or in-line cleaning
				  machine is operating in the idling mode; and
b. A thermometer or thermocouple shall be
				  used to measure the temperature at the centroid of the air blanket; and
c. If the temperature at the
				  coldest point of the centroid of the air blanket exceeds thirty percent (30%)
				  of the solvent's boiling point, measured in degrees Fahrenheit (° F), the
				  chiller shall be adjusted so that this specification is met.
4. If a superheated vapor system
				  is used, the temperature of the solvent vapor at the centroid of the
				  superheated vapor zone shall be maintained at least ten degrees Fahrenheit
				  (10° F) above the solvent's boiling point and shall be monitored weekly
				  according to the following specifications:
a.
				  The temperature shall be monitored while the batch vapor or in-line cleaning
				  machine is operating in the idling mode; and
b. A thermometer or thermocouple shall be
				  used to measure the temperature at the centroid of the superheated solvent
				  vapor zone; and
c. If the
				  temperature at the centroid of the air blanket is less than ten degrees
				  Fahrenheit (10° F) above the solvent's boiling point, the system shall be
				  adjusted so that this specification is met.
5. If a carbon adsorber is used, the
				  concentration of solvent in the exhaust shall not exceed twenty-five (25) ppm.
				  Compliance with this requirement shall be determined using the following
				  methods:
a. Within sixty (60) days of initial
				  startup of the carbon adsorber, the solvent concentration in the carbon
				  adsorber exhaust shall be tested using 40 C.F.R Part 60, app A-7, Method 25,
				  incorporated in §
												36.4 of this Part. Each
				  test shall consist of three (3) separate one (1) hour samples, and the
				  arithmetic mean shall be used to determine initial compliance. The results
				  shall be reported to the Office of Air Resources within sixty (60) days of the
				  test.
b. Continuing compliance
				  shall be determined weekly using the following procedure:
(1) The concentration of solvent in the
				  exhaust shall be measured while the cleaning machine is in the working mode and
				  is exhausting to the carbon adsorber; and
(2) An easily accessible sampling port shall
				  be provided that is located on the exhaust outlet at least eight (8) stack or
				  duct diameters downstream and two (2) stack or duct diameters upstream of any
				  flow disturbance such as a bend, expansion, contraction, or outlet. The
				  sampling port must not be downstream of any other inlet; and
(3) Solvent concentration shall be measured
				  at the sampling port using a colorimetric detector tube capable of detecting
				  twenty-five (25) ppm with an accuracy of ± twenty-five percent (25%) or
				  better; and
(4) Colorimetric
				  detector tubes must be used according to the manufacturer's instructions;
				  and
(5) If the carbon adsorber's
				  exhaust exceeds twenty-five (25) ppm then the desorption cycle shall be
				  adjusted or the carbon canister replaced in order to bring the exhaust
				  concentration below twenty-five (25) ppm; and
(6) If desorption of the carbon adsorber is
				  required, the carbon adsorber shall not be bypassed during the desorption
				  cycle.
6. If
				  dwell or a superheated vapor system is used, the actual dwell time shall equal
				  or exceed the minimum dwell time. Minimum and actual dwell time shall be
				  determined using the following procedures:
a.
				  For units without a superheated vapor system, the minimum dwell time shall be
				  determined for each part type or parts basket or for the most complex part type
				  or parts basket using the following procedure:
(1) Determine the amount of time necessary
				  for the part or parts basket to cease dripping once placed in the vapor zone.
				  The part or parts basket used for this determination must be at room
				  temperature when placed in the vapor zone; and
(2) The minimum dwell time required for parts
				  to remain in the freeboard zone above the vapor zone is calculated as
				  thirty-five percent (35%) of the time determined in §
													36.13(A)(6)(a)
				   ((1)) of this Part.
b. The minimum dwell time for a cleaning
				  machine equipped with a superheated vapor system shall be determined according
				  to the specifications of the manufacturer of the control equipment; and
c. On a monthly basis, the actual
				  dwell time that parts are held in the freeboard zone above the vapor zone shall
				  be measured; and
d. If the actual
				  dwell time is less than the minimum dwell time determined using the applicable
				  procedure in §§
												36.13(A)(6)(a) or
				  (b) of this Part for a particular part or
				  parts basket, the automatic parts handling system must be adjusted so that this
				  specification is met.
7.
				  Safety switches must be tested semiannually.
8. Alternative monitoring procedures may be
				  used if approved by the Director and the EPA.