Document jrOmVv2yVJzZ7m70qn3Bw3GR

NOTICE IN 'TURN: OR CHANGES IN THIS TEXT BE INITIALED AND DATED, so that those following on the routing know whom to contact for further clarification* DATE: *J. G. Dickinson, c&P, ChestnutRun .. J. A. Lamiet, C&P, Chestnut Run H. W. Ling, C&P, Chestnut Run W. W. Greer, C&P, B-17274 J. D. Travis, C&P, B-17272 T. A. Bartolec, C&P, B-17276 R. F. Hedgepath, Legal, D-7063 C. W. Hoeftman, MCD, N-2468-A1 F. W. Warwick/W. H. Miller, MCD, N-2537-1 October 31. 1980 . J&P . m titJL nhk uliffb Ipf "TUB \/J & Hod > APPROVAL REQUEST TECHNICAL LITERATURE Please approve the attached publication. Any comments and/or changes to this publication must be signed and dated. See note below. TITLE: Railcar Unloading Procedures for Ti-Pure Ti02 Slurry PURPOSE: Revision and replacemnt of stock. *Those whose name follow the asterisk (*) above certify that the pro duct and performance claims contained in subject material are accurate and that the files of the Chemicals and Pigments Department contain data to support the claims. They further certify that any claims attributed to non-Du Pont sources are consistent with our knowledge and experience. NOTES: Extra copy for J. G. Dickinson attached. 'a ^aifcar* Unloading Procedures - TITANIUM DIOXIDE Pp"* & Du Pont owns and operates the largest slurry rail fleet in the world. The fleet is specifically designed for handling TI02 slurry, and is constantly being expanded to meet our customers' needs. this booklet describes the unloading procedure for our railcars that will minimize the time and effort required, taking full advantage of the unique design features of our sfurry cars. In addition, our team of product specialists are available to advise in the design of slurry unloading and handling equipment, and to answer any questions on slurry handling procedures. A typical system is shown in Figure I. De tailed procedures follow. DUP050070789 N42108.01 Safety} In Du Pont tests, dusts of titanium dioxide produced a response in the lungs of rats comparable to the effects given by inertor nuisance dusts. Titanium dioxide is regulated as an air contaminant bv the U. S. Department of Labor (OSHA) under Title 29 CFR 1910.1000. OSHA has ruled that an employee's exposure to titanium dioxide in any eight-hour work shift of a forty-hour week shall not exceed a Time-Weighted Average of 15 rrig/m3 in aid* The American Conference of Governmental Industrial Hygienists (ACGIH) classifies titanium dioxide as a nui sance dust and recommends a Threshold Limit Value, TLV, of 10 mg/m3 total dust or 5 mg/m3 respirable dus* Du Pont has elected to observe the ACGIH limit ] 3 ] ] Unloading Procedures 3 ] DUPX Slurry Cars 3 1 with Threaded Product 3 3 1 ] ] 3 3 3 J J 3 DUP050070791 DUP050070792 DETAILED UNLOADING PROCEDURES I Gar Hookup j>' ( 1 Secure Car. Use wheel chocks to prevent movement during unloading. Signs should be posted at each end of car indicating "TANK CAR CONNECTED-DO NOT MOVE,'* #(^2 Inspect car for damage. Anything unusual should be reported to the Du Pont salesman or sales office, (including broken seals on top and bottom of car). Inspect pressure relief device on top of car. BOTTOM OF CAR I ( 3 Remove seal and open housing around valve and discharge outlet on bottom of car. Dust cap on discharge outlet should be removed with a 2" open end wrench. DUP050070793 I Car Hookup (Con't.) BOTTOM OF CAR AIR HOSE l'--" . unloading . # ConnectAhose. The car is equipped with a 4" male adapter coupling to fit "Evertite" or "Kamlock" connections. The hook-up is much easier if first a 4" 90 elbow is attached to the car and the unloading hose is then coupled to the elbow. Make sure the quick connects are securely fastened. It is a good idea to secure the "arms" on the coupling with wire to prevent parting during unloading. discharge valved . 5 Connect air line. The elbow should be equipped with a air hose connection. a a- DUP050070794 I Car Hookup (Con't.) 6 Remove seal from recirculation line enclosure (on top of car) and open cover.^Remove dust cap from recirculation line. Open ball valve (located below the quick-connect fitting) very slowly and make sure car is not pressurized. 7 Connect recirculation hose. The car is fitted with a male 3" adapter coupling to fit "Evertite" or "Kamlock" connections. Again, it is advisable to wire the "arms" down to prevent parting during unloading. Remove the cap from the air line fitting and open the valve slowly to relieve any car pressure or vacuum. DUP050070795 I Car Hookup (Con'fc,) 8 The car may be unloaded usingAa pump^alone, or with a combination of air pressure and a pump*. The car can be pres surized to a maximum of 70 psig. (75 psig Rupture Disc Vent) If air is to be used, connect the hose from a regulated supply to the car's air line (on top of the car). A pressure relief device must be installed in the air line, set to relieve if the air pressure exceeds 70 psig. The car is equipped with a Chicago coupling, and has a ball valve immediately below the connection. Remove seal and unbolt the dome hatch, prop open slightly to allow air to enter the hatch during unloading. The hatch should be open only during unloading or mixing Leaving the cover open for extended periods of time may result in moisture loss from the car. causing dry pigment flakes and grit, *lt is very difficult to empty a car completely using air pressure alone, as recirculation is Impossible with that arrangement. For this reason, unloading using only air pressure is not recommended. Using air pre$sure to "force-feed" the unloading pump will gener ally result in faster unloading than using a pump alone. DUP050070796 II Car Mixing: Air Sparge* X STORAGE 9 Open the pump suction valve/ and recirculation valve and close the storage valve to direct air flow to the recirculation header. 10 Sparge for 5-10 minutes only. (Longer sparging runs the risk of dyring out pigment in the pipes and producing hard grit particles.)* *If the car cannot be unloaded when received, it should be sparged per step 10 about once a week to avoid excess settled pigment. For convenience an air hose adapter connection for the 3" recirculation fitting on top of the car can be used. Settling is not usually a problem with cars unloaded within a month of filling, but over longer periods excess settled pigment may hinder initial flow and make complete unloading difficult. DUP050070797 II Car Mixing (Con1t.) 11a. Close valve at the pump suction. valve Blow air through the discharge A for 5-10 seconds. This will clear any material that may have settled into the outlet during transit. DUP050070798 HI Car Unloading valve, open the pump suction and direct fow to storage tank. If air pressure is to be used to assist flow close the dome hatch and pressurize the car through the top air line connection. 14 Pump slurry until car runs empty* DUP050070799 IV Car Washing close pump;.suction valve. Add 100 gallons or more of water through the recirculation line. (lOO gallons of water will reduce the slurry solids concentration in the storage tank by approximately 0.3%.) Use only clean water. Process water contaminated with vehicles, biocides, etc. should not be used. For systems using air pressure in the car, it may be necessary to depressurize car to allow water addition (if water pressure is lower than car pressure). slurry. DUP050070800 IV Car Washing (Con't.) 117 Slow recirculation lines clean with air (into car). Cl 8 Pump car empty to storage tank. (Valves set as f in steps 13-14.) 1 9 CloseAunloading valve and blow contents of hose and dis charge line into storage tank with air. This will clear all hoses and minimize spillage when disconnecting lines. DUP050070801 V Car Closeup CLOSE AFTER CAR IS DEPRESSURIZED yj v-;: f (Make sure ear is depressurized} Close all valves on car. /, Disconnect ail hoses. DUP050070802 " U* PAT CP* This brochure is for guidance in handling (flanium dioxide slurry. Each instruction and all technicatinformafionare rendered by the Du Pont Company gratis. The brochure Is based on information believed to be reliable by the Du PontCompany andis Intended for useby persons having skill and know-how. It is not atMnclustve end suitability of the practices described for any particular situation shouldbe confirmed by the user. The Instructions contained in this bulletin are given and accepted at the user's risk, and the Du Pont Company makes no guarantee of results and assumes no responsibility for results obtained or damages incurred from their use in whole or in part. This publication is not to be taken as a license to Operate under or recommendation to Infringe any patents. ISSUEOSVW-- DUP050070803