Section 554.470 - Procedure for installing duct systems in railway cars or vans1. Lay out the inside probe and duct system on top of the load. Insert the probes down the center of the load at 4-foot intervals to a depth near the floor. Both end probes must be placed 2 feet from the end of the car. Seal the door of the car through which intake and exhaust tubes from the blower will connect to the probe-duct system as provided in this section.2. Heavy laminated paper must be placed in the doorway on the outer side of the wooden grain door and sealed to the doorfacing and doorsill by masking tape. The top edge of this paper must be lapped over and fastened to the top edge of the wooden grain door. The remainder of the opening must be covered by a paper grain door to the ceiling of the car.3. Loosen the wooden grain door and slip the bottom edge of the paper door down so as to overlap the paper on the wooden door. Renail the wooden grain door in place. Seal this lap of paper grain door to the paper covering on the wooden door using masking tape. Nail a 1- by 4-inch plank across the top of the paper grain door inside the car, leaving a sufficient edge of paper above the plank to seal it with masking tape or "bug" putty. Seal the ends of the paper grain door to the inside wall of the car with masking tape. Cut two holes in the paper grain door, one with an 8-inch diameter and one with a 6-inch diameter. These holes must be cut just above the edge of the wooden grain door so that ducts will rest on the top of the wooden grain door. Seal an 8-inch collar inserted through the hole through which the exhaust duct may be inserted. Insert the end of the inside duct system out through the 6-inch hole so as to protrude about 2 inches beyond the paper grain door and to which the intake duct from the blower may be attached. Close the opposite door and all other apertures in the car and seal them with masking tape and "bug" putty so as to make the entire car gastight.4. Connect the intake duct from the blower to the end of the inside probe system extending through the paper car door. Insert the end of the exhaust duct through the 8-inch collar in the paper grain door and seal with masking tape or "bug" putty. Start the blower and introduce the required amount of fumigant. Allow the blower to operate continuously for at least 10 minutes after the fumigant has been discharged. Disconnect the intake and exhaust ducts, seal the openings and close the door of the car. Allow the car to remain undisturbed for 16 hours.5. "Bug" putty may be purchased from fumigant supply companies or may be made from 8 parts asbestos, 3 parts calcium chloride and 4 parts water. Click here to view image.
Nev. Admin. Code § 554.470
Dep't of Agriculture, No. 54.02 -1 § II part subsec. B, eff. 4-2-71