Automatic Tube Brushing (ATB) System
An Automatic Tube Brushing (ATB) System shall be installed on each chiller (heat exchanger) condenser (and absorber in absorption units) to provide optimum tube cleanliness and heat transfer. The systems are to be manufactured and installed by Water Technology of Pensacola, Inc., Pensacola, Florida.
2.0 Product Description:
The ATB System consists of a special nylon brush inserted in each tube and a low-pressure drop catch basket attached to each end of the tube. A custom-made four-way reversing valve is installed to permit reversing the direction of water flow. The reversed water flow pushes the brush through the tube, removing tube deposits. The brush is caught in the opposite end basket and remains there until flow is reversed again in 30 seconds, thus repeating the process.
The frequency of the reversing cycle is set up to match job conditions (normally every six hours). The four-way reversing valve pneumatic (or electric) actuator is controlled by a pre-set time cycle that assures regular tube brushing during equipment operation.
3.0 Equipment Specification:
3.1.1 Turbo Brush (One (1) per set): Each brush to be nylon bristle, titanium wire and polypropylene tipped. One tip to have vanes to cause increased spiraling of brush through tubes for superior cleaning. Brush to have interference fit with ID of tube not to exceed 0.025" interference.
3.1.2 Basket (Two (2) per set): Low pressure-drop design, polypropylene basket with removable 4-prong end-clip; neck outside diameter to press fit inner diameter of tube. End-clip shall not restrict basket end more than 25%. Basket shall allow for removal and replacement of brushes from tubes.
Epoxy for Basket Installation: Special two-part water-proof epoxy for basket installation to have similar co-efficient of expansion as tube material.
Tool: Special tool for installation of baskets.
3.5 Pneumatic Actuator: To be pre-mounted on the valve. Double actuating cylinder to assure trouble-free operation. Operation to be on 50 (minimum) to 100 (maximum) PSIG air pressure supplied by others.
3.6 Position Control Switches: Micro-switch to be supplied to indicate complete turn of four-way valve in normal and reverse flow.
Nema 4x enclosure with mounting bracket.
3.8 Operation and Installation Manual: Two (2) copies to be provided.
4.0 Shop Testing: In addition to tests specified for the valve, Manufacturer will functionally test the entire system prior to shipment, including valve, actuator, solenoid valve, position indicator and control panel.
5.0 Field Supervision: Manufacturer shall supply field supervision of brush and basket installation to assure proper installation and to protect manufacturer's warranty.
7.0 Warranty: Manufacturer shall guarantee system, when operated according to its instructions, and shall provide a fouling factor in the condenser of .00025 or better.
Manufacturer to warranty components for one year against defective materials and workmanship. Defective parts to be returned freight prepaid to factory and will be replaced FOB from manufacturer's plant.
8.0 Order Procedures:
Water Technology of Pensacola, Inc.