Slotted Pipe Skimmer Brochure

Each Hudson Industries rotating drum skimmer can be uniquely engineered to meet customers’ exact specifications.INDUSTRIES SERVEDHudson Industries has engineered systems and equipment for major corporations throughout the world. Providing prod-ucts and services that are trusted by organizations including BP, Amoco and NASA.• Offshore / Onshore Oil and Gas• Water / Wastewater Treatment• Power Generation• Petrochemical• Steel Manufacturing• Pulp and Paper• Mining and Minerals• Allied Transportation• General Heavy Industry• Food Processing PRINCIPLE OF OPERATIONOil and water by their nature are immiscible (de-scribes two or more liquids that will not mix to-gether to form a single homogeneous substance), this fact, along with the difference in density that exists between oil and water, leads to the oil, lower density, rising to the top of the tank. The oil sepa-rates according to Stoke’s Law, which defines the terminal rise velocity of a given size of oil droplet:Vr = g d2 (?w - ?o) / 18 ?Vr = rise velocity of oil droplet g = acceleration due to gravity ?w = density of water ?o = density of oil d = oil particle diameter ? = viscosity of waterThe oil will form a layer above the water surface that can be separated from the water by skimming action. The Rotatable Slotted Pipe Skimmer (RSPS) w w w.hudsonind.comSLOTTED PIPESKIMMERSlotted Pipe in Tank of Untreated Water??????? ? ? ? ? ? ? ? ? ???Industrial Separation & Process Solutionsis the simplest and most economical method available and is used exten-sively in munici-pal and industrial wastewater instal-lations.The RSPS is located at the end of the Separa-tion Bay. The RSPS is rotated manually or by motor operation so that the slotted section is lo-cated ¼” to ½” above the water and located in the oil layer. The RSPS then col-lects the oil under weir flow conditions. When the RSPS’s slots are rotated backward, the skimming temporarily ceases. DESIGNThe RSPS is capable of spanning the width of the tank bay with maximum deflection limited to L/360, or l/4 inch whichever is less (both with pipe empty and the pipe full) and allows a uniform flow of oil into the pipe along its entire length. L is defined as the unsupported product length, in inches.60 º slots are cut symmetrically about the top dead center of the pipe O.D. as viewed from the pipe cross sec-tion. The edges of the slots serves as a weir over which the floating oil flows into the pipe when the pipe is rotated to operating condition. The edges of the slot are cut parallel to the longitudinal axis of the pipe at regular intervals of not more than 2 ‘- 6 “ with a minimum 1 1/2 “ wide bands of the full pipe periphery remain-ing in the pipe to act as stiffeners. The RSPS is supported at each end and rotates in wall mounted bearings consisting of a Stainless Steel mount-ing plate that is welded to an adjustable Stainless Steel plate. A Stainless Steel cover plate encloses replace-able bearings which are made of UHMW or TFE material. The mounting plate may also contain Kevlar or O-Ring seals. A suitable watertight seal (by installer) shall be provided between the rotating pipe and the wall mounted bearing. The seal is constructed so that the seal material is selected so that it is not affected by grease, mild acids, or alkalis. OIL OUTWATERDEGREE ADJUSTMENT TEEOIL FLOWSLOTTED PIPE SKIMMERable bearings which are made of UHMW or TFE material. The mounting plate may also contain Kevlar or O-Ring seals. A suitable watertight seal (by installer) shall be provided between the rotating pipe and the wall mounted bearing. The seal is constructed so that the seal mate-rial is selected so that it is not affected by grease, mild acids, or alkalis. SLOTTED PIPE SKIMMERWall SleevesA pipe wall sleeve (by installer) of the same diame-ter as the skimmer will be cast in the wall, where re-quired, to permit flow between adjacent skimmers and discharge from the tanks. Each sleeve will have an intermediate flange. Sleeves will be provided by the mechanical contractor. AVAILABLE SKIMMER OPERATOR STYLESHudson RSPSs are available in four basic styles: lever operated; rotating handle with worm and worm gear operation; rotating handle with sprocket and chain operation; and motor driven le-ver operated complete with a level control and limit switches for rotational limit of the slotted pipe. The RSPS pipe is made of Stainless Steel Construction.Lever OperatedThe RSPS can be manually operated by means of handle or lever that is attached directly to the slot-ted pipe O.D. The bearing ends are lubricated using a “Zirk” style fitting located at the edge Separator Bay adjacent to the skimmer. It is possible to rotate the pipe a minimum of 90 º in either direction from the “off” position where the slot is at top dead center.Hand Wheel with Worm GearsThe RSPS is manually rotated by means of a rack and pin worm gear using a shaft and hand wheel mounted on a bracket at the edge of the Separator Bay. Gears and bearing ends are lubricated using a “Zirk” style fit-ting located at the edge of the Separator Bay adjacent to the skimmer. Gears are manufactured of Bronze or Stainless Steel for long life and wear resistance. It is possible to rotate the pipe a minimum of 90 º in either direction from the “off” position where the slot is at top dead centerHand Wheel with SprocketsThe RSPS is manually operated by means of a sprocket and chain using a shaft and hand wheel mounted on a bracket at the edge of the Separator Bay. The chain and sprockets are manufactured of Stainless Steel for long life and wear resistance. It is possible to rotate the pipe a minimum of 90 º in either direction from the “off” position where the slot is at top dead centerMotor Driven Lever Operated The RSPS is driven via a motor/actuator/linkage sys-tem. Each drive unit will consist of a drive motor a minimum of NEMA “B,” totally enclosed fan cooled; a right angle gear reducer; an actuator arm and linkage; limit switches, motor starters, and control panel. The RSPS will be capable of rotating in any position within 45 degrees in one direction to 45 degrees opposite. The system can be equipped to operate based on a level switch, if required. Actuator arm and linkage are of Stainless Steel Construction.API SEPARATOR BAYThe API guidelines for the Separator Bay design criteria are:The typical API separator is a long, narrow, shallow tank. De-sign standards for the Separator Bay can be obtained from API Publication 421, “Management of Water Discharges: Design and Opera¬tion of Oil Water Separator.” The API design criteria including the following:• Length = depth/rise rate x design horizontal veloc-ity. The minimum length-to-width ratio is 5.0 : 1.0 to ensure that the operating allow adequate separation conditions, and to minimize the poten¬tial for short-circuiting in the unit• The minimum depth-to-width ratio is 0.3 minimum to 0.5 maximum to ensure that the sepa¬ration units are not excessively deep. This provision minimizes the amount of time needed for oil par¬ticles to rise to the surface.• The maximum channel width is 20 ft; the maximum depth is 8 ft .• The horizontal velocity should be the smaller of 3 ft/min or 15 times the oil globule rise rate, to minimize turbulence so as to impede oil/wastewater separa-tion• Reaction jet baffles are recommended, to diffuse influent flows across the width and depth of the API separator. The baffles help minimize the effect of high wastewater inlet velocities, as well as the pos-sibleshort-circuiting and decreased oil-removalYour Local Sales Contact8031 East Market street - ste 2warren, oh 44484 usaoffice: 704-480-0014fax: 330-787-0299e-mail: info@hudsonind.comw w w.hudsonind.comBulletin SP08-705 0M ©2005 Hudson Industries SLOTTED PIPE SKIMMER??????? ? ? ? ? ? ? ? ? ???Industrial Separation & Process Solutionsefficiency associated with such velocities • API separators can remove oil particles of 150-mi-cron size or larger. The size removal can however be adjusted to promote the removal of smaller oil drop-lets. If no adjustments are made, particles smaller than 150 microns will normally exit the separator with the wastewater, and will need to be removed by down-stream treatment.