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AFL INDUSTRIES,INC. RIVIERA BEACH,FLORIDA SERVICE INSTALLATION,OPERATION PAGE 1 OF 2 MANUAL &MAINTENANCE INSTRUCTIONS PRODUCT DELTA-TUBE AND DIFFUSION BAFFLES BASIC OPERATION PRINCIPLE The principal function of the Delta-Tubes is to provide a coalescing surface on which minute oil globules can agglomerate. The coalesced oil then rises to the surface to be skimmed. The Delta-Tubes make possible attainment of one of two goals--or a compromise between them: 1. The oil content of the water can be significantly reduced;or 2. The flow through the separator can be greatly increased without degradation of the oil-separating performance. The vertically-positioned tubes, made of perforated polypropylene, have oleophilic (oil-attracting) properties. Small, suspended particles of oil agglomerate on the surface and wick up,or if they become sufficiently large and buoyant,they break free and rise through the tubes. The vertical orientation of the tubes contributes to a more efficient separation,and the oil globules are free to travel a clear upward path to the surface. The Delta-Tubes remove oil globules down to the 20 micron range;this contrasts with the removal of 150 micron globules by gravity separators constructed on API dimensional criteria. In AFL coalescing separators, the Delta-Tubes typically produce effluents with an oil content of less than 10 mg./Itr. INSTALLATION(if not pre-installed in VTC Oil Water Separator) The Delta-Tube modules may be furnished either in separate bundles or modules which are approximately 1 ft. sq. in cross section,or they may be enclosed in either an FRP or metal frame. Tube height may vary according to tank size or contract requirements. In most cases where tubes are supplied in separate bundles,they should be manually placed in the allotted space,and packed as close as possible to each other. Depending on contract specifications, the bundles might be placed on grating or directly on the tank floor. See equipment specifications and description in this manual for details. Depending on application and space configuration, and in order to prevent flotation,tubes are covered by grating which in turn might be fastened to the tank or container walls. Where Delta-Tube modules are shipped in enclosures which hold the bundles, the enclosures are provided with lifting eye bolts,lugs,or straps which permit lifting the entire assembly or individual bundles, and placement of tubes in the allotted space. Upon placement, and depending on job requirements, the tube packs may be secured in place by recommended means. See contract drawings for specific fastening details. SUPERSEDES: I-O-M:2.25