OPERATING MANUAL UF-70 OIL/WATER FEG SYSTEM WITH PERMEATE RECYCLE INSTALLATION OPERATION MAINTENANCE PARTS KOCH MEMBRANE SYSTEMS, INC. 850 Main Street Wilmington, MA 01887 (978) 657-4250 MARCH 1992 TABLE OF CONTENTS Page PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . i GLOSSARY . . . . . . . . . . . . . . . . . . . . . . ii WATER QUALITY GUIDELINES . . . . . . . . . . . . . . v 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . 1.1 ULTRAFILTRATION . . . . . . . . . . . . . 1.2 FEG TUBE DESCRIPTION . . . . . . . . . . Figure 1.1 General Ultrafiltration . . . Figure 1.2 FEG Tube Description . . . . 1.3 MODE OF OPERATION . . . . . . . . . . . . 1.3.1 Batch Operation . . . . . . . . . 1.3.2 Modified Batch Operation . . . . . 1.4 OPERATION PARAMETERS AND LIMITATIONS FOR OIL/WATER EMULSIONS . . . . . . . . . Figure 1.3 Batch Flow Schematic . . . . Figure 1.4 Modified Batch Flow Schematic 1.5 PRELIMINARY SYSTEM CHECKS . . . . . . . . 1.6 FLUSHING MEMBRANE PRESERVATIVE . . . . . 1.7 SYSTEM ALARMS AND FAULTS . . . . . . . . 1.7.1 RECYCLE . . . . . . . . . . . . . . . . . 1.8 ROUTINE CHECKS AND DATA COLLECTION . . . Figure 1.5 Performance Log Ultrafiltration Systems . . . . . . . . . 2.0 ROUTINE OPERATING PROCEDURES . . . . . . . . . 2.1 SYSTEM DESCRIPTION . . . . . . . . . . . 2.1.1 UF-70 O/W FEG System Description . 2.1.2 UF-70 O/W FEG Component Description . . . . . . . . . . . Figure 2.1 Simplified Flow Schematic . . 2.2 SYSTEM START-UP . . . . . . . . . . . . . Figure 2.2 Flow Schematic "Process Mode" 2.2.1 RECYCLE MODE. . . . . . . . . . . . . . . 2.3 PROCESS COMPLETION . . . . . . . . . . . 2.3.1 Batch Systems . . . . . . . . . . 2.4 BRIEF SHUTDOWN PROCEDURE . . . . . . . . 2.5 EXTENDED SHUTDOWN PROCEDURE . . . . . . . 2.6 PRESERVATIVE SOLUTIONS . . . . . . . . . Table 2.1 Preservative Solutions . . . . 2.7 CLEANING PROCEDURES . . . . . . . . . . . 2.7.1 System Draining and Displacement . Figure 2.3 Flow Schematic "Displacemet Mode" . . . . . . . . . . . . 2.7.2 Chemical Cleaning . . . . . . . . TABLE OF CONTENTS . . . . . . . . 1-1 1-1 1-1 1-2 1-3 1-4 1-4 1-4 . . . . . . . . 1-4 1-5 1-6 1-7 1-7 1-7 1-8 1-8 . 1-9 . 2-1 . 2-1 . 2-1 . . . . . . . . . . . . . 2-1 2-2 2-3 2-4 2.5A 2-6 2-6 2-6 2-7 2-7 2-7 2-8 2-8 . 2-9 . 2-10 (continued) Figure 2.4 Flow Schematic "Cleaning Mode". 2.7.3 Mechanical Cleaning Spongeballing . . . . . . . . . . . Table 2.2 Cleaning Formulations for Oil Water Emulsion Ultrafiltration Systems . . . . Figure 2.5 Flow Schematic "Spongeballing" . . . . . . . . 3.0 WATER FLUX DETERMINATION . . . . . . . . 3.1 STANDARD CONDITIONS AND CORRECTIONS 3.2 MEASURED FLUX EXPEDIENT . . . . . . Table 3.1 Water Flux Temperature Correction Factor (F) . Page 2-11 2-14 2-15 2-17 . . . . 3-1 . . . . 3-1 . . . . 3-2 . . . . 3-3 4.0 MAINTENANCE . . . . . . . . . . . 4.1 REGULAR CHECKS . . . . . . . 4.2 BYPASS OF LEAKING MEMBRANES . Figure 4.1 Bypass of Leaking 4.3 TROUBLESHOOTING . . . . . . . 4.4 MEMBRANE TUBE REPLACEMENT . . . . . . . . . . . . . . . . . Membranes . . . . . . . . . . . . . . . . . . . . . . 4-1 4-1 4-1 4-1 4-2 4-2 5.0 COMPONENT SPECIFICATIONS . . 5.1 PUMP, MOTOR, COUPLINGS 5.2 VALVES . . . . . . . . 5.3 MISCELLANEOUS . . . . . 5.4 REPLACEMENT PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-1 5-1 5-3 5-4 6.0 INSTRUMENTS AND CONTROLS . . . . . . 6.1 Pressure Gauges . . . . . . . . 6.2 Low Pressure Switch, PSI-1 . . 6.3 Temperature Indicator, TI-1 . . 6.4 Temperature Switch, TSH-1 . . . 6.5 Permeate Flowmeter, FM-1 . . . 6.6 Permeate Bypass Flowmeter, FM-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6-1 6-1 6-1 6-1 6-2 6-2 7.0 ELECTRICAL . . . . . . . . . . . . . . . . . . . 7-1 I APPENDIX CIRCULATING PUMP SPECIFICATION SHEET . . . . . . AI-1 . . . . . PRECAUTIONS . . . . . . . . . . 1. Membranes must not be allowed to dry out. remain filled if the system is shut down. irreversible. The tubes must Membrane dryout is 2. No anti-foam agents of any kind are to be introduced into the Koch ultrafiltration system without prior approval from Koch. 3. No silicone-based materials (waterproofing sprays, lubricating fluids or greases, etc.) are to be used in or around the Koch ultrafiltration system. Using these materials in the system in any amount will cause complete and irreversible membrane fouling. 4. Provisions must be made for properly venting the system during shutdown procedures and draining. The vacuum breaker/vent systems provided with all Koch systems must be maintained in proper working order to keep the Koch membrane replacement policy in force. If pressure on the permeate side of the membrane exceeds the pressure on the process side by more than five (5) PSI, membrane delamination may result. 5. Minimize the time the system is under low flow conditions. These are periods when bypass valves are open or circulating pumps are not running. 6. NEVER RUN THE ULTRAFILTER WITH THE PERMEATE VALVES CLOSED! 7. Never start a pump without throttling the pump discharge valve. Throttling will prevent a pressure shock wave from damaging the membranes. 8. The maximum pressure the membranes should be exposed to is 70 PSIG. 9. The maximum temperature the membranes should be exposed to is 130°F. 10. The allowable pH range for membranes (continuous) is 2.0-10.0 at 120°F (49°C). -iGLOSSARY Air Vent A valve which is manually opened to allow air to escape from the system to the atmosphere during start-up, and opened at shutdown to prevent a vacuum in the system. Cleaning System An accessory system incorporated in the UF unit to clean the membranes if they become fouled. It consists of a cleaning tank, pump, and associated piping and valves. Concentrate The mixture returned to the concentrate holding tank after processing. Deionized Water Water from which virtually all dissolved solids have been removed. Demineralized Water See "deionized water." Emulsified Oils A suspension of oil droplets in water made by blending the oil with emulsifying agents and other material. Emulsions are also called "soluble oils," a misnomer, but generally used in the metal working industry. Flux The rate of permeation, usually expressed as GFD (gallons per square foot of membrane area per day). Fouling A condition in which the membrane flux rate is restricted due to the accumulation of material on the membrane surface. Free Oil All unemulsified oils that are present in the process fluid. -iiGLOSSARY Membrane Processing Separation of the elements of a fluid, at the molecular level, by a membrane. The membrane will pass through smaller molecules while retaining larger molecules. Metal Fines Very small slivers of metal generally produced in a grinding operation. Oil Skimmer A device for skimming off the free oil on the surface of the process fluid in a tank. Permeable Porous to the passage or penetration by fluids. Permeate The term used to describe the passage of water through a membrane. It is also the fluid (basically water) separated from the process fluid in the Koch ultrafiltration system. Permeate Back Pressure Pressure exerted on the permeate side of the membrane. If this pressure exceeds 5 PSI, the membrane could be damaged. Preservative Solution A solution that is introduced to the membrane tubes during the idle periods to prevent membrane deterioration. Process Fluid The oil and water mixture (or other process fluid) delivered to the UF unit for processing. Purge A displacement procedure that exchanges the process fluid in the UF system with water from the cleaning tank. -iiiGLOSSARY Sludge Deposits on the bottom of the process tanks that are undesirable as they will foul the membranes. Spongeballing A method of hydraulically forcing balls of sponge-like material through the flow channel of a tubular membrane. Surfactant Surface active agents used for cleaning the UF system. Tramp Oil See " Free Oil." U-bend A "U" shaped tube used to connect one membrane tube to another in the same pass to provide a series-connected configuration. Ultrafilter An arrangement of Koch tubular membranes used in the ultrafiltration process. Ultrafiltrate A synonym for permeate. Ultrafiltration A pressure-driven permeation process used in conjunction with semi-permeable membranes. Flow rate through the membranes and permeate selectivity are governed by pore size, distribution, membrane porosity, and the specific process fluid itself. -iv- WATER QUALITY GUIDELINES Ultrafiltration membranes are susceptible to fouling from water that is high in mineral content or suspended material. For this reason the water used in flushing and cleaning the membranes should conform to the following: - Turbidity less than 0.1 NTU - Iron less than 0.3 ppm - Manganese less than 0.05 ppm - Aluminum less than 10 ppm - Calcium less than 10 ppm - Silica less than 10 ppm - Free from particulate matter such as rust, scale, flake material, sandy granular material, slurries, scum, algae. Softened water (less than 60 mg eq CaCO3/liter) or evaporator condensate is generally acceptable for cleaning and flushing ultrafiltration membranes. -v- 1.0 INTRODUCTION 1.1 ULTRAFILTRATION Ultrafiltration is an industrial process in which semi-permeable membranes are used to separate water and some dissolved low molecular weight materials from a mixture that is submitted for processing. The goal of the process is to effectively fractionate the original process stream into a concentrate stream and a very low concentration permeate stream. The concentrate is then disposed of by the most economical means or further processed if the concentrate contains valuable material. The permeate stream is normally discharged to a sanitary sewer or recycled to rinse systems since it is relatively clean. In Koch ultrafilters, the membranes are tubular in shape and are bonded to the inner surface of the tube support backings. The process fluid is circulated through these membrane tubes under pressure. The oil is retained and the water is separated from the mixture as shown in Figure 1.1. The pore structure of the membrane acts as a filter, passing water and small solutes (e.g., salts), while retaining larger emulsified and suspended matter. The pores of ultrafiltration membranes are much smaller than the particles rejected. These particles cannot enter the membrane structure and hence the pores cannot become plugged. 1.2 FEG TUBE DESCRIPTION In FEG ultrafilters, the membrane is cylindrical and bonded to the inner surface of a protective, porous backing called a support tube. Each membrane and backing is enclosed in a tubular housing. The housing is threaded at both ends for connecting them in series and to the process inlet and outlet manifolds. 1-1 SMALL MOLECULES LARGE MOLECULES MEMBRANE FIGURE 1.1 GENERAL ULTRAFILTRATION Boot seals, installed at each end of the membrane and the support tube, isolate the permeate from the process stream. The boot seal wraps around the inside and the outside of the tube ends. A stainless steel ferrule holds the boot seal in place, the outer portion of the boot has two formed O-rings to provide the boot-tohousing seal (see Figure 1.2). When in operation, permeate travels through the membrane, collects in the annular space between the membrane tube housing and the boot seals, and then flows out of the permeate port. Tubular membrane housing specifications are as follows: Tubular Membrane Module Length10 Feet Tubular Membrane Area 2.2 Square Feet Fluid Volume per Tube 0.437 Gallons 0.054 Cubic Feet 1-3 1.3 MODE OF OPERATION During normal operation the process fluids can be processed in either a batch or a modified batch mode. Each of the operating modes is described in more detail below. 1.3.1 BATCH OPERATION In batch operation, process fluid is pumped from a large process tank through the ultrafilter membrane tubes and back to the process tank (see Figure 1.3). As water permeates from the ultrafilter, the emulsion becomes more concentrated. When a predetermined concentration has been reached, the batch is completed and the remaining emulsion is disposed of in whatever manner best suits the operator. The water that is removed from the emulsion is directed to drain or reused depending upon the individual application. The process tank is then refilled and processing of a new batch will begin following a cleaning of the ultrafilter. 1.3.2 MODIFIED BATCH OPERATION Modified batch operation differs from the batch operation mode only in that as the level in the process tank drops due to the removal of permeate, fresh process feed material is added to the process tank. The advantages of the modified batch mode of operation are that run times are extended and cleaning frequency is reduced. 1.4 OPERATIONAL PARAMETERS AND LIMITATIONS FOR OIL/WATER EMULSIONS Maximum operating pressure at pass inlet ................. 70 PSIG Maximum operating pressure at pass outlet ................ 20 PSIG Minimum operating pressure at pass outlet ................ 10 PSIG Pressure drop at 30 GPM/tube ............................. 33 PSIG Minimum System Circulation Rate .......................... 120 GPM Maximum Operating Temperature ............................ 130°F Maximum back pressure at permeate outlet ................. 5 PSIG Membrane area per 10 foot FEG tube .................... 2.2 sq. ft. 1-4 PROCESS FEED UF PROCESS TANK RECIRCULATION LOOP PERMEATE RECIRCULATION PUMP FIGURE 1.4 MODIFIED BATCH FLOW SCHEMATIC Hold up volume per 10 foot tube ........................ 0.437 gal. Minimum flow per series pass of tubes .................. 30 GPM PH range for HFM membranes at 120°F (continuous)........ 2.0-10.0 PH range for HFP membranes at 120°F (continuous)........ 2.0-10.0 1.5 1. PRELIMINARY SYSTEM CHECKS Check the membrane housing U-bends and terminator nuts for tightness. Hand tighten only. Check the permeate hose connections on the membrane shells. Hand tighten (only) these connections. 2. Check the operation of the pressure and temperature switches. 3. Open the pressure gauge isolation valves 50%. 1.6 FLUSHING MEMBRANE PRESERVATIVE Koch ultrafiltration membranes have been impregnated with a preservative solution prior to shipment. This must be removed from the system prior to operation. To remove the preservative, follow the cleaning procedure outlined in Section 2.7 using cleaning solutions #3 or #4 as described in Table 2.2. 1.7 SYSTEM ALARMS AND FAULTS Koch ultrafiltration systems are protected by several different alarms. These alarms when actuated will shut the system down to protect the membranes. All systems utilize high temperature and low pressure alarms. Other alarms that may be included in a system, (depending on the system size), are high concentrate, high pressure, high pan level and low process tank level. After an alarm fault has been corrected, the system may be restarted as described in Section 2.2. Refer to Section 4.3 "Troubleshooting" for guidance in correcting faults. 1-7 1.8 ROUTINE CHECKS AND DATA COLLECTION The ultrafiltration system should be checked at least twice a shift. These checks should include a visual inspection for leaks and a visual check of the permeate quality and flow rate. In addition, operating data should be recorded in the Koch Membrane Systems Operating Log Book supplied with each system. A sample data sheet is shown on the following page. 1-8 Performance Log - Ultrafiltration Systems SYSTEM INFORMATION COMPANY NAME: SPENT OIL INFORMATION SOURCE: LOCATION: FREE OIL QUANTITY: SYSTEM IDENTIFICATION: OPERATOR: DATE/ TIME KOCH MEMBRANE SYSTEMS INC. 850 MAIN STREET WILMINGTON, MA. 01887 PHONE: (800) 343-0499 SLUDGE/SOLIDS: FEED INFORMATION OIL pH % KOCH COLOR VOL. ADDED CLEANING SYSTEM NUMBER PERM VOL. TIME CONC. P IN P OUT TEMP RATE GPM REMOVED HOUR SOL'N PSI PSI F FLUX GPM REMARKS 2.0 ROUTINE OPERATING PROCEDURES 2.1 SYSTEM DESCRIPTION 2.1.1 UF-70 O/W FEG System Description The UF-70 system consists of up to 4 parallel passes of 8 tubes in series. Each membrane tube is ten feet long and contains 2.2 square feet of membrane area, giving the unit an area of 70.4 square feet. Physically the rest of the system consists of a circulating pump rated for 120 GPM at 157 FT. HD., 50 gallon cleaning tank, associated piping and various switches and gauges. A control panel which contains the pump start/stop buttons, indicator lights and alarms is mounted on the unit. The cleaning tank is provided for flushing the membrane tubes. This is accomplished by the proper arrangement of the valves which allow for the circulation of the cleaning solution with the same pump used for the process fluid. Permeate is routed to return to the cleaning tank during this period. 2.1.2 UF-70 O/W FEG Component Description The following component listing is to be utilized to cross reference component descriptions used in this manual with component numbers shown on Koch System Flow Schematic C5046-5041 which is included with this manual. Refer to Figure 2.1, Simplified Flow Schematic. P-1 Circulation Pump V-1 Process Inlet Valve V-2 Circulation Pump Discharge Valve V-3 Process Outlet Valve V-4 Circulation Pump Suction Valve (Recirculation Valve) V-5 Cleaning Return Valve and Vent Valve V-6 Permeate Flowmeter Bypass Valve 2-1 2-2 V-8 V-9 V-10 V-11 V-12 V-13 V-14 V-15 V-16 V-17, V-18 V-19 FI-1, FI-2 Permeate to Cleaning Tank Valve Permeate to Drain Valve Cleaning Tank Float Valve System Drain Valve Cleaning Tank Feed Valve High Pressure Gauge Isolation Valve Low Pressure Gauge Isolation Valve Permeate Flowmeter Isolation Valve Permeate Flowmeter Isolation Valve Spongeball Insertion Isolation Valve Spongeball Insertion Drain Valve Permeate Flowmeter 2.2 SYSTEM START-UP (Refer to Figure 2.2) The following procedure outlines the start-up procedure for an oil/water mixture being processed as a BATCH operation. 1. Turn on the main power. 2. Close the following valves: V-2 Circulation Pump Discharge Valve V-4 Recirculation Valve V-5 Cleaning Return Valve V-6 Permeate Flowmeter Bypass Valve V-8 Permeate to Cleaning Tank Valve V-11 System Drain Valve V-12 Cleaning Feed Valve V-17, V-18 Spongeball Insertion Isolation Valves 3. Open the following valves: V-1 V-3 System Process Inlet Valve Process Outlet Valve 2-3 V-104 FI 100 PI 101 V-102 PI 100 TI 100 UF 70 V-101 V-101 SPONGEBALL RETRIEVAL BASKET P-1 SPONGEBALL INSERTION V-108 PROCESS/CLEAN TANK (100 GALS) V-103 FIGURE 2.2 FLOW SCHEMATIC: "PROCESS MODE" 3. Open the following valves: (continued) V-9 Permeate to Drain Valve and any other valves so as to provide unrestricted flow of permeate to drain or other desired location. V-15, V-16 Permeate Flowmeter Isolation Valve V-19 Spongeball Insertion Drain Valve 4. Start the Circulation Pump, P-1. 5. Crack open Circulation Pump Discharge Valve, V-2. 6. Slowly fill the system. When fluid returns to the process tank or permeate flows steadily through the permeate flowmeter, slowly open V-2 all the way. 7. The system should be as shown in Figure 2.2 Flow Schematic "Process Mode." 8. Adjust the Process Outlet Valve, V-3 to maintain a minimum cabinet outlet pressure of 10 PSI. The inlet pressure should not exceed 65 PSI. The difference between the two pressures should be at minimum 33 PSI. (Usually, V-1 will be completely open but if the inlet pressure exceeds 65 PSI, then V-1 must be shut slightly). Use V-4 circulation pump suction valve to adjust pressures as well. 9. Examine the permeate. It may have a color, but it should remain clear. If it should remain cloudy for more than two hours, refer to Section 4.2, Bypass of Leaking Membranes. 2-5 2.3 PROCESS COMPLETION Batch Systems (See Figure 2.3 Flow Schematic Displacement Mode) When the waste has been concentrated to the extent desired, the batch should be terminated as follows. 1. Slowly CLOSE the Circulation Pump Discharge Valve, V-2. 2. STOP the Circulation Pump, P-1. 3. PURGE the concentrate from the system to the process tank as follows: a. Fill the cleaning tank with hot (120°F) water. b. Open the cleaning tank feed valve, V-12, leave the process outlet valve, V-3, open. c. Close the process tank inlet valve, V-1. d. Close the circulation pump suction valve, V-4. e. Close the circulation pump discharge valve, V-2. f. Open the permeate flowmeter bypass valve, V-6. g. Start the circulation pump, P-1. h. Slowly open the circulation pump discharge valve, V2, and pump 1/2 to 3/4 of the cleaning tank contents through the system to the process tank. The system should now be as shown in Figure 2.3 Flow Schematic "Displace to Process Tank." i. Close the circulation pump discharge valve, V-2. j. Stop the circulation pump, P-1. k. Dispose of the concentrate in the process tank in the manner that best suits the operator. 2.3.1 2.4 BRIEF SHUTDOWN PROCEDURE If the system is to be shutdown for 15 minutes or less, the waste may be left in the system. This is not always the case however. Each application is different. A trade off in flux rate loss vs. cleaning will have to be determined by the operator(s). 2-6 Perform a short term shutdown as follows: 1. 2. 3. 2.5 Slowly close the Circulation Pump Discharge Valve, V-2 Stop the Circulation Pump, P-1. The system may be restarted as described in Section 2.2.1. EXTENDED SHUTDOWN PROCEDURES 1. See Sections 2.7.1 and 2.7.2 (steps 1-17). 2. Prepare the system for storage by filling the cleaning tank with the appropriate solution from Table 2.1. 3. Circulate the storage/preservation solution for 20 minutes as in a normal cleaning (Section 2.7). 4. Slowly close the circulation pump discharge valve, V-2. 5. Stop the circulation pump, P-1. 6. Ensure that all the system valves are closed to lock the preservative solution in the system. 2.6 PRESERVATIVE SOLUTIONS If the system is to be shut down for any length of time, the membranes must be kept wet with a preservative solution. The following table lists the type of preservative solutions to be used as determined by the length of the shutdown. TABLE 2.1 PRESERVATIVE SOLUTIONS Length of Shutdown HFA, HFM, HFP 15 minutes to 2 days Clean Water 2 days to 30 days 99.5% Water 99.5% Water 0.5% Sodium Benzoate 0.5% Sodium Benzoate 30 days or longer 80% Glycerine 20% Water 2-7 2.7 CLEANING PROCEDURES HFD Clean Water 99.5% Water 0.5% Sodium Benzoate Cleaning is necessary when the flux rate drops to an unacceptable level, generally 30% of the design flux. The frequency of cleaning must be determined by operational experience and plant requirements. 2.7.1 System Draining and Displacement (Refer to Figure 2.3 Flow Schematic) Prior to any cleaning procedure or extended shutdown (Section 2.4 or 2.5), the waste within the system must be removed to maximize the efficiency of the cleaning chemicals and to minimize fouling during extended shutdown. If the system has no direct draining to the tank, displace the waste with water through the process return line. Perform this displacement according to the procedure below. Once the waste has been displaced, perform a normal cleaning. (Section 2.7.2.) Displacement Procedure 1. Fill the cleaning tank with hot (120°F) water. 2. Slowly close the Circulation Pump Discharge Valve, V-2. 3. Stop the Circulation Pump, P-1. 4. Close the Process Inlet Valve, V-1. 5. Close the Circulation Pump Suction Valve, V-4. 6. The Process Outlet Valve, V-3 should remain open. 7. Open the cleaning tank feed valve, V-12 8. Open the permeate flowmeter bypass valve, V-6. 9. Start the Circulation Pump, P-1. 10. Crack open the Circulation Pump Discharge Valve, V-2. Slowly fill the system. When fluid reaches the process tank, slowly open V-2 100%. 11. The system should now be as described in Flow Schematic "Displacement Mode", Figure 2.3. 12. PUMP 1/2 to 3/4 of the tank full of water through the system. 2-8 2-9 Displacement Procedure (continued) 12. CLOSE the Circulation Pump Discharge Valve, V-2. 13. STOP the Circulation Pump, P-1. 14. CLOSE the Process Return Valve, V-3. 15. Drain the system by performing the following steps: a. OPEN the following valves: V-11 System Drain Valve V-2 Circulation Pump Discharge Valve V-4 Circulation Pump Suction Valve V-5 Cleaning Return Valve b. CLOSE the following valves: V-12 Cleaning Tank Feed Valve 16. Fill the cleaning tank with hot (120°F) water. 2.7.2 Chemical Cleaning (Refer to Figure 2.4 Flow Schematic "Cleaning Mode.") The normal cleaning solution is a mixture of 1.0% by volume of Koch Liquid Detergent (KLD) pH adjusted to 10-10.5 with caustic in hot (120°F) water. Other cleaning solutions are listed in Table 2.2. If a cleaning is not successfully accomplished with a hot detergent wash (as determined by a water flux test), you should contact the Koch Technical Service Group for assistance. The following procedure should be followed when performing a chemical cleaning: 1. Remove the waste oil from the system by following the displacement procedure outlined in Section 2.7.1. 2. Fill the cleaning tank with the appropriate cleaning solution from Table 2.2. 3. Close the following valves: V-1 Process Inlet Valve V-2 Circulation Pump Discharge Valve 2-10 V-104 FI 100 PI V-102 101 PI 100 TI 100 UF 70 V-101 SPONGEBALL RETRIEVAL BASKET P-1 SPONGEBALL INSERTION V-105 PROCESS/CLEAN TANK (100 GALS) V-103 FIGURE 2.4 FLOW SCHEMATIC: "CLEANING MODE" 3. Close the following valves: (continued) V-3 Process Outlet Valve V-4 Circulation Pump Suction Valve V-9 Permeate to Drain Valve V-11 System Drain Valve 4. Open the following valves: V-5 Cleaning Return/Vent Valve V-6 Permeate Flowmeter Bypass Valve V-8 Permeate to Cleaning Tank Valve V-12 Cleaning Feed Valve V-15 Permeate Flowmeter Isolation Valve V-16 Permeate Flowmeter Isolation Valve 5. Start the Circulation Pump. 6. Slowly open the Circulation Pump Discharge Valve, V-2. The system should now be as shown in Figure 2.4 Flow Schematic "Cleaning Mode." 7. Adjust the Circulation Pump Discharge Valve, V-2 and the Circulation Pump Suction Valve, V-4 to obtain a membrane inlet pressure of 50-55 PSIG and a membrane outlet pressure of 18-20 PSIG. Maintain a minimum differential of 33 PSIG between the inlet and outlet pressures. 8. Circulate the cleaning solution for approximately two hours or until the permeate rate stops increasing. Unusually long or repeated cleanings may be required for severely fouled membranes. DO NOT ALLOW the system temperature to exceed 125°F. 9. If a chemical cleaning does not restore adequate flux rate to the system, mechanically clean the membranes as described in Section 2.7.3. If in doubt as to whether or 2-12 not this mechanical cleaning is necessary, measure the water flux of the system (see Section 3.0). If the measured water flux is less than that listed in Table 3.1, a mechanical cleaning should be performed. The water flux is measured by circulating clean warm water (70-100°F) through the system in the same manner used during the cleaning of the system. 10. On the completion of a cleaning, shut the system down by closing the Circulation Pump Discharge Valve, V-2 and stopping the Circulation Pump, P-1. 11. Transfer the contents of the cleaning tank to the process tank by the following series of steps: 12. OPEN the following valves: V-3 Process Outlet Valve V-5 Cleaning Return and Vent Valve V-6 Permeate Flowmeter Bypass Valve V-8 Permeate to Cleaning Tank Valve V-12 Cleaning Tank Feed Valve 13. CLOSE the following valves: V-1 Process Tank Feed Valve V-2 Circulation Pump Discharge Valve V-4 Circulation Pump Suction Valve V-9 Permeate to Drain Valve V-11 System Drain Valve 14. Start the Circulation Pump, P-1. 15. Slowly open the Circulation Pump Discharge Valve, V-2. 16. When the system is vented, close the Cleaning Return and Vent Valve, V-5. 2-13 17. When the cleaning tank is empty, close the Circulation Pump Discharge Valve, V-2 and stop the circulation pump. 18. The system can now be started on a process fluid as described in Section 2.2. Mechanical Cleaning Spongeballing (See Figure 2.5 Flow Schematic "Spongeballing") If after a chemical cleaning, the corrected water flux of the system is less than normal (see Section 3.0), mechanically cleaning the system may be necessary. Mechanically cleaning the membranes is performed by hydraulically forcing spherical sponges through the membrane tubes. It is normally done during chemical cleaning. 2.7.3 Spongeballs are available from Koch or they may be cut from finecelled soft sponge (approximately 1-1/4 inches in diameter). Spongeballing a system is performed by following the procedure described below: 1. The system should be in the cleaning mode (see Section 2.7). 2. Ensure that the spongeball insertion valves, V-17 and V18 are closed, the spongeball insertion drain valve V-19 is open, and the spongeball retrieval basket is positioned under the cleaning return line. 3. Remove the victaulic clamp and cover from the spongeball insertion rig. 4. Moisten and insert approximately ten (10) spongeballs. 2-14 TABLE 2.2 CLEANING FORMULATIONS FOR OIL/WATER EMULSION ULTRAFILTRATION SYSTEMS Solution # Components % Concentrate 1 Ultraclean A 2 Ultraclean A KOCHKLEEN 221 3 Koch Liquid KLD III 1.0% May be more effective than UC-A. Excellent for complexing metals. 4 Koch Liquid KLD III KOCHKLEEN 221 1.0% More effective than KLD alone with some process streams. 5 Note: KOCHKLEEN 120 KOCHKLEEN 221 .5% Comments 0.5% Add until pH is 10.0-10.5 Add until pH is 10.0-10.5 2.0% Add until pH is 3.0 - 3.5 KLD III is a liquid and is 1% solution requires 1 gal Ultraclean A and KOCHKLEEN and 2% require 4.2 lbs and respectively. Higher concentration may be required for severely fouled membranes. More effective than UC-A alone. Do not use with HFA membranes. This cleaner is used to clean metalfouled membranes. It is preceeded and followed by 1 of the above cleaners. used on a volume basis. That is a of KLD III per 100 gal of water. 120 are solids so solutions of .5% 16.7 lbs per 100 gal of water, 2-15 5. Replace the cover and victaulic clamp. Close the spongeball insertion drain valve, V-19. 6. Close V-4 to force spongeballs to the spongeball retrieval basket. 7. Open the spongeball insertion valves, V-17 and V-18. 8. Throttle V-2, to force spongeballs to the inlet manifold. 9. When all the balls have been caught in the basket in the cleaning tank, open V-2 and close the spongeball insertion valves, V-17 and V-18. It should require 2-3 minutes for all the balls to pass through the system. 10. Repeat steps 1-8 four times. If the flux has not been restored to an acceptable level, different chemical cleaning solutions should be used and the chemical wash repeated. 2-16 V-106 FI 100 PI 101 V-102 PI 100 TI 100 UF 70 V-101 SPONGEBALL RETRIEVAL BASKET P-1 SPONGEBALL INSERTION V-105 PROCESS/CLEAN TANK ( 100 GALS) V-103 FIGURE 2.5 FLOW SCHEMATICS: "SPONGEBALLING MODE" KOCHKLEEN® 10/30/01 UF CLEANING PROGRAM - OILY WASTE WATER Step 1. Rinse the system Step 2. Caustic Cycle pH 10.0-10.5 125-130 F 90-120 min. 1% KOCHKLEEN KLD III v/v Adjust pH with KOCHKLEEN 221 if needed Step 3. Rinse the system well Step 4. Acid Cycle pH 3.0-4.0 125-130 F 30 min. 2 % KOCHKLEEN 120 w/w Adjust pH down with KOCHKLEEN 221 if needed Step 5. Rinse the system well Step 6. Caustic Cycle pH 10.0-10.5 125-130 F 45 min. 1% KOCHKLEEN KLD III v/v Adjust pH with KOCHKLEEN 221 if needed Step 7. Rinse the system well Step 8. Water Flux Readings (GFD) "Spongeball is recommended during each wash cycle" Cleaning Precautions: • Care should be taken not to chill shock the membranes when proceeding from one step to the next. • All chemicals should be measured accurately. • Over-dosage of chemicals will cause shorter membrane life. Contact KOCH Membrane Systems if you have any questions concerning the above cleaning procedure. 3.0 WATER FLUX DETERMINATION Water flux is the rate of permeation measured while circulating water through the ultrafilters. Determining this rate will give an indication of the cleanliness of the membrane surface. 3.1 STANDARD CONDITIONS AND CORRECTIONS Standard conditions for measuring flux set at an average pressure of 50 PSIG and a temperature of 77°F. Because these conditions are not always attainable, the measured flux can be corrected for temperature and pressure. Water flux should, however, be taken at an average pressure of 20 PSIG or more. The units for water flux are gallons of permeate per square foot of membrane surface per day (GFD). Because the permeate rate is generally measured in gallons per minute, the rate will have to be converted as follows: Jm (GFD) = (Permeate rate in GPM) (1440 min/day) Total membrane area in ft. sq. The measured flux, Jm, can be corrected to standard conditions by using the following equation: Jcorr = (Jm) (100) (F) Pin + Pout Where Pin is the inlet pressure Pout is the outlet pressure F is the temperature correction factor (see Table 3.1). 3-1 The normal fluxes for clean membranes at standard conditions are listed below: Membrane Type HFM HFP Water Flux (GFD) @ 50 PSIG, 25°C 100 - 150 100 - 150 3.2 MEASURED FLUX EXPEDIENT A convenient method of determining measured flux (GFD) is to divide the quantity of permeate (in milliliters) collected in 10 seconds from a series pass of tubes by the number of 10 ft. membrane tubes in that pass. The resultant number will be measured by flux rate in GFD for that particular pass. For example: tubes. 1600 ml in 10 seconds from a series pass of 8 10 ft. Jm = 1600 = 200 GFD 8 The measured flux is then corrected for temperature and pressure. 3-2 TABLE 3.1 T(°F) 126 124 122 120 118 117 115 113 112 109 108 106 104 102 100 99 97 95 93 91 90 88 86 84 WATER FLUX TEMPERATURE CORRECTION FACTOR (F) T(°C) 53 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 F 0.595 0.605 0.615 0.625 0.636 0.647 0.658 0.670 0.682 0.694 0.707 0.720 0.734 0.748 0.762 0.777 0.793 0.808 0.825 0.842 0.859 0.877 0.896 0.915 T(°F) 82 81 79 77 75 73 72 70 68 66 64 63 61 59 57 55 54 52 50 48 46 45 43 41 3-3 T(°C) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 F 0.935 0.956 0.978 1.000 1.023 1.047 1.072 1.098 1.125 1.152 1.181 1.212 1.243 1.276 1.310 1.346 1.383 1.422 1.463 1.506 1.551 1.598 1.648 1.699 4.0 MAINTENANCE 4.1 REGULAR CHECKS The following items should be checked and corrected on a regular basis: Pump: - Bearing lubrication (every two weeks) Seal leakage (daily) Secure to bedplate (daily) Motor: - Alignment to pump (excessive current draw, vibration, heat, etc.) (every two days) Secure bedplate (daily) - Vacuum Breakers and Vent Valves: - Coupling deterioration (whenever shutdown) - Disassemble, inspect and clean monthly 4.2 BYPASS OF LEAKING MEMBRANES A defective (leaking) membrane will cause turbid permeate. This problem can be overcome without shutting the system down for tube replacement. The permeate in the defective tube is prevented from entering the permeate handling lines by plugging the permeate port (1/4" NPT) of the defective tube and capping the permeate fitting that is connected to the defective tube. (See Figure 4.1.) FIGURE 4.1 BYPASS OF LEAKING MEMBRANE 4-1 4.3 TROUBLESHOOTING The following table is intended to serve as a guide for locating problems which may occur with the system: Problem Low Flux Probable Cause Fouled membranes Corrective Action Clean or replace membranes Improper operating pressure Adjust system inlet and outlet pressure High feed concentration Remove feed from system Low temperature Increase temperature (but do NOT exceed 125°F) Batch overconcentrated Add process fluid to tank or empty tank and refill with fresh process fluid Empty feed tank Add feed material Ruptured membrane tube Replace tube Faulty pump Repair or replace pump Low pressure switch activates at more than 10 PSI Adjust pressure switch High temperature High fluid temperature Shut down system and allow to cool Permeate with High Turbidity Leaking membrane Plug or replace tube Low Pressure 4.4 MEMBRANE TUBE REPLACEMENT Generally, the best time to replace a defective membrane tube is during a shutdown for cleaning. In the meantime, the defective tube should be isolated to prevent leakage of concentrate into the permeate (see Section 4.2, "Bypass of Leaking Membrane"). 4-2 All new membrane tubes must be prepared before installing as replacements. Refer to the following sections for the proper procedure: A. Preparing Individual Membrane Tubes Prepare membrane tubes as follows: 1. Remove endcaps and permeate plug from the membrane tube. 2. Hose out the membrane tube with D.I. water. 3. Drain the membrane tube. 4. Reinstall the endcaps to protect threads. B. Installing Membrane Tubes After the membrane tube has been prepared by the above procedure, install it as follows: 1. Disconnect the permeate hose fittings attached to the defective membrane tube. 2. Disconnect the membrane tube to be replaced from the PVC U-bends or manifold to which it is attached. 3. Remove the defective membrane tube from the unit. 4. Install the new membrane tube. 5. Remove the two protective endcaps from the membrane tube. 6. Ensure that both the PVC spacers and rubber washers are installed at both ends of the membrane tube (PVC spacer goes in first.) 7. Reconnect the U-bends or manifold connection. Carefully orient the permeate port into the proper position. Reconnect permeate tubing. Start the system as outlined in Section 2.2 "System Startup." If a process fluid leak appears at the replacement tube U-bend or manifold coupling, tighten the leaking connection by hand until the 4-3 leak stops. If this does not stop the leak, shut down the unit, flush the process fluid from the membrane tubes and drain the unit. Then disconnect the leaking U-bend or manifold coupling and add another membrane washer to the connection. This should be done only as a last resort. C. Installation of Recycle Option 1. Plant air supply is connected to the air line located on the electrical cabinet for operation of recycle valve V21. 2. An air line must also be connected from the electrical panel to V-21, to operate the valve. 3. Recycle valve V-21 is installed so that the "common" port connects to the UF permeate line. The normally open port is connected to the permeate "out" or drain line. The normally closed port is connected to the process tank line. 4-4 5.0 COMPONENT SPECIFICATIONS 5.1 PUMP, MOTOR, COUPLINGS 1. Circulating Pump P-1 Horizontal End Suction Centrifugal pump, frame-mounted, all iron construction, semi-open impeller, mechanical seal. Capacity: Pump: 120 GPM @ 157 Ft. HD. Carver Model 1 1/2" x 2" x 7 LA with 6 1/2 dia. impeller. P/N 0121566 IMPORTANT NOTE:CARE MUST BE TAKEN TO INSURE PUMP INSTALLED HAS PROPER DIAMETER IMPELLER. THIS IS A CRITICAL POINT. Motor: Coupling: 5.2 10 HP at 3500 RPM, 230/460 volt, 3 pH, 60 HZ, TEFC 215T Frame. P/N 0110235 Woods Sureflex #6S. 1 3/8" x 1 1/4" standard keyway. 1 1/4 flange P/N 0125062 1 3/8 flange P/N 0125063 sleeve P/N 0125516 VALVES Gear Operated Butterfly Valves a. Pump Discharge Valve, V-2 2" Butterfly Valve with Gear operator, cast iron body 316 stainless steel disc and shaft. BUNA-N seat and seal. P/N 0131073 b. Outlet Valve, V-3, Return to Suction V-4 Same as "a" (above). P/N 0131073 5-1 Lever Operated Butterfly Valves a. Inlet Valve, V-1 3" Butterfly Valve with lever operator, cast iron body. 316 stainless steel disc and shaft. BUNA-N seat and seal. P/N 0131082 Cleaning Tank Return Line/Air Vent Valve V-5, and Drain Valve, V-11 1" SOC true union ball valve, PVC construction, teflon seats and seals. GF + Type 342 P/N 0130140 Cleaning Tank Float Valve, V-10 3/4" NPT float valve, brass construction. P/N 0139105 Permeate Valves, V-15, and V-16 Similar to V-5 and V-11 except 1/2" SOC. P/N 0130085 Permeate Valves V-6, V-8, V-9 1" IPS true union ball valve, PVC construction, teflon seats and seals, socket ends. + GF + Type 342. P/N 0130170 Clean Tank To Pump Suction V-12 2" SOC true union ball valve, PVC construction, teflon seat, Viton seal. + GF + Type 342 P/N 0130220 5-2 Pressure Gauge Isolation Valves V-13, V-14 1/2" NPT Ball Valve, steel construction, Endurion coated, teflon seats and seals. Tee handle. P/N 0130320 Vacuum Breaker VB-1 1 1/4" NPT x 1" NPT bushing check valve. Carbon steel construction, stainless steel spring. Crack pressure 1/8 psi. P/N 0136135 Sponge-Ball Insertion Valves, V-17, V-18 1 1/2" NPT ball valve, steel construction, full port, teflon seats and seals. P/N 0130420 Sponge-Ball Drain Valve, V-19 1/2 NPT ball valve, steel construction, teflon seats and seals. P/N 0130320 5.3 MISCELLANEOUS Strainer ST-1 3~ flanged "Y" strainer with hinged steel cover, cast iron body, stainless steel screen with 5/32 diameter perforation. P/N 0061390 Cleaning Tank This tank to be fabricated in 304 stainless steel to Abcor Drawing No. C5388-3051. P/N0211636 5-3 5.4 REPLACEMENT PARTS LIST Item Quantity Membrane Washer U Bend PVC Holding Nut Retaining Ring Truarce #5108-131 Manifold Nipple Cap Push On Permeate Plug PVC Shoulder Spacer Permeate Pass Kit Membrane Tubes 10' HFM-251FNO 10' HFD-251FNO 10' HFA-251FNO 10' HFP-276FNO Koch Part Number 8 7 2 4 8 4 0020378 0020390 0020280 0020310 0160235 0211805 0020290 0211786 2 2 2 2 0711532 0711212 0711124 0711622 3 7 If you are located in a remote region where industrial parts may be difficult to obtain, the following list of replacement parts is recommended: Item Quantity Fuse Fuse Pump Seal Coupling Coupling Coupling Pressure Switch Temp Switch U-Bend Permeate Pass Kit Motor Membrane Washer PVC Holding Nut Retaining Ring Truarce #5108-131 Manifold Nipple Cap Push On Permeate Plug PVC Shoulder Spacer Membrane Tubes 10' HFM-251FNO 10' HFD-251FNO 10' HFA-251FNO 10' HFP-276FNO 4 2 2 2 2 2 Koch Part Number 7 2 4 8 0101614 0101670 0126058 0125062 0125063 0125516 0211440 0211463 0020390 0211786 0110235 0020378 0020280 0020310 0160235 0211805 0020290 8 8 8 8 0711532 0711212 0711124 0711622 1 1 7 8 1 8 7 5-4 6.0 INSTRUMENTS AND CONTROLS 6.1 Pressure Gauges Standard Abcor pressure gauge, 1/2" NPT connection, diaphragm isolated, range. PI-1 0-100 PSI P/N 0140010 PI-2 0-60 PSI P/N 0140009 6.2 Low Pressure Switch, PSL-1 Snap action pressure switch, 1/4" NPT lower female connection, adjustable range to 60 PSI, proof pressure 450 PSI, set by Abcor at 20 PSI decreasing pressure. P/N 0211440 6.3 Temperature Indicator, TI-1 3" Dial, 4" stem, Bi-Metallic Thermometer Range 0-200°F, 1/2 NPT lower male connection. Ashcroft Dial Thermometer 30AI60L Ashcroft Dial Thermowell 75W0250ST260S U" Dimension 2 1/2", 316 Stainless Steel. 3/4" NPTM x 1/2", NPTF connection. 6.4 P/N 0140160 P/N 0140152 Temperature Switch, TSH-1 ASCO Tri-point temperature switch with fixed deadband and adjustable set point, switch rating 5 amps at 120 VAC. Unit to consist of: a.) Watertight Switch assembly with a Dual Range 10-71°C (50°-160°F) P/N 0211463 6-1 b.) Direct Temperature Probe Transducer Unit P/N 0211465 c.) 316 S/S - 2 1/2" Thermowell with internal and external threads P/N 0140155 6.5 Permeate Flowmeter, FM-1 Direct reading in GPM 1/2" NPT 316 stainless steel end fittings. Buna-N "O" rings. Range 0 - 2.5 GPM P/N 0200020 6.6 Permeate Bypass Flowmeter, FM-2 Direct reading in GPM water. 1" NPT 316 stainless steel end fittings. Buna-N "O" rings. Range 0-10 GPM. P/N 0200030 6-2 7.0 ELECTRICAL All wiring will be as per the latest edition of the national electrical code (NEC) JIC standards (EGP). All electrical components will be to NEMA standards and UL and CSA approved where applicable. Refer to electrical schematic for standard components. 7-1 APPENDIX I CIRCULATION PUMP SPECIFICATION SHEET KMS Part No. 0121566 Specification Control Sheet Ref. A5388-8004 Duty Circulation Pump P-1 Project No. 1. 2. REQUIREMENTS 1.1 Liquid/Temperature 1.2 Total Generated Head ft. 1.3 Capacity GPM 1.4 Suction Conditions 1.5 Sp. Gravity 1.6 Viscosity C. Stokes PUMP DATA P/N 0121566 2.1 Pump Mfg/Serial No. 2.2 Number of pump stages 2.3 Shaft arrangement 2.4 Model and size 2.5 Delivery branch bore 2.6 Suction branch bore 2.7 Table of flange 2.8 Capacity 2.9 Total generated head 2.10 Imp dia. - rating 2.11 Imp dia. min/max 2.12 Pump speed - RPM 2.13 Recommended drive - BHP rating/max 2.14 Type of drive 2.15 Maximum suction lift 2.16 Performance curve 2.17 Discharge position/rotation 2.18 2.19 Efficiency % Bedplate reqd yes/no AI-1 APPENDIX I Oil Water/125°F 157 ft. 120 GPM Flooded 1.0 Carver One Horiz. End Suction 1 1/2"x 2"x 7" LA 1 1/2" 2" 120 GPM 157 ft. 6 1/2" Semi open 4 1/2"/7" 3500 RPM 7.7/10 Direct 3699/7-10-70 Vertical/C.W. from Motor End 62% CIRCULATION PUMP SPECIFICATION SHEET (Continued) 3. 4. 5. MATERIALS OF CONSTRUCTION 3.1 Casing/covers/chamber 3.2 Impeller 3.3 Neck Rings 3.4 Shaft 3.5 Shaft/impeller/sleeves 3.6 Gland 3.7 Gland packing 3.8 Lantern ring 3.9 Bearing type 3.10 Mechanical seal type 3.11 Lubrication MOTOR 4.1 4.2 4.3 4.4 4.5 4.6 4.7 P/N 0110235 Type Enclosure Frame Size Rating - HP Speed - RPM Specification Electricity supply 4.8 4.9 4.10 Class of insulation Terminal box position F.L. current Ball Crane Single Type 21-BPICI Grease Tri-Voltage TEFC 215 T 10 HP 3500 RPM 208/230/460V, 3 PH, 60 HZ B F-1 24.4/12.2 AMPS APPROX. SHIPPING SPEC. 5.1 5.2 5.3 CI CI STL STL STL/CI/416 S/S C.I. Net Weight Gross Weight Capacity AI-2
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