250 R.I. Code R. 250-RICR-120-05-23.9

Current through November 7, 2024

Section 250-RICR-120-05-23.9 - Specifications for Door Fan/Local Exhaust Systems

A. Door fan/local exhaust systems operated pursuant to § 23.7(A)(2) of this Part shall adhere to the following requirements:

1. The door fan/local exhaust system must include a mechanical exhaust fan that is activated when the loading door is open, drawing air from the machine drum to an exhaust and causing room air to be drawn in through the loading door;

2. A minimum inward air velocity of one hundred (100) fpm must be maintained through the door opening area of the loading door of the machine. The velocity much be checked at least once per week using a portable velometer or an equivalent device;

3. The door fan/local ventilation system must not recirculate vapors and must be vented to the outdoor air;

4. The door fan/local exhaust ventilation emissions must be controlled to a design emission standard of five (5) ppm perchloroethylene and an in-use maximum compliance standard of twenty (20) ppm;

5. The owner or operator shall provide a sampling port in the exhaust ductwork which is:

a. Easily accessible;

b. Downstream of any emissions control device;

c. Upstream of any other inlet to the ductwork; and

d. To the maximum extent possible, at least eight (8) stack or duct diameters downstream and at least two (2) stack or duct diameters upstream of any flow disturbance such as a bend, expansion, contraction, or outlet in the ductwork, unless this is not possible given the physical layout of the facility. If it is not possible to locate the sampling port eight (8) stack or duct diameters downstream and two (2) stack or duct diameters upstream of any flow disturbance, the port should be located at a point as near to those parameters as possible.

B. The owner or operator of the facility shall measure the perchloroethylene concentration in the exhaust stream weekly at the sampling port specified in § 23.9(A)(5) of this Part, using the following procedures:

1. A colorimetric detector tube capable of measuring a concentration of twenty (20) ppm to an accuracy of ± five (5) ppm shall be used;

2. Colorimetric detector tubes shall be used according to the manufacturer's instructions; and

3. If a carbon adsorber is used to reduce the perchloroethylene concentration in the exhaust stream, the measurement shall be performed just prior to a planned desorption of the carbon adsorber.

250 R.I. Code R. 250-RICR-120-05-23.9

Amended effective 12/24/2018