Document XRELq9mdREZqmyXg8eqLxg2Nx

INTEROFFICE CORRESPONDENCE Et hyl Gaso l ine Co r po r at io n CHRYSLER BUILDING 405 Lexing t o n Avenue New Yor k December 5, 1941 MEMO TO MR. H. W. KALEY Attached is a report which Ellis Locher prepared covering the work which he did in cooperation with the Schutte & Koerting Company on the operation of an eductor used for tank cleaning. Ellis advises that he still has two of these eductors at home, and he has Schutte & Koerting*s permission to keep these as long as we continue to make experiments with them.. JACsk Att. \H TANK CLEANING ELECTOR The following is a brief description of certain equipment which appears could be used for the cleaning of small storage tanks-- that is to say, the typical type tanks found in bulk plants, either vertical or horizontal. These tanks usually have a maximum dimension of 10 feet by 30 feet and capacities in the neighborhood of 20,000 gallons or less. The purpose of using this equipment is to enable a tank cleaning job to be done without the necessity of men entering tanks. EQUIPMENT Equipment consists primarily of a water actuated, specially designed, eductor. The one used for experimental purposes is manufactured by the Schutte-Koerting Special 2" Eductor (3rass) (Water Jet Cesspool Pump - Pig. 222). Water under pressure is introduced in the inlet side of the eductor. A hose connected to the suction side of the eductor is placed in the tank and the combined discharge would again go through a length of hose to a pit. OPERATING CHARACTERISTICS In practise a working pressure at the inlet side of the eductor at kOjf/ sq. in., and a maximum flow of 23 GPM has given satisfactory re sults. However, as this pressure increases up to a certain point the suction capacity increases at a much higher rate. For the purpose of this equipment the suction capacity may be defined as the auantity of material removed from the tank and for convenience measured in gallons per minute. 0022410 Curve Sheet I shows the relationship between Pressure Capacity, or the quantity of water entering the eductor, and Suction Capacity plotted against Working Pressure, These curves were plotted for water only, hut the manufacturer of the eductor uses as a rule of thumb to measure the solid material handling capacity of the eductor, U pounds of sand per gallon of v/ater. Wo accurate tests have been made to measure the rate at which solids can be removed. Prom crude tests which I have run, it is apparent that there is little advantage in operating the eductor at pressuresabove 60 pounds per square inch, although if pressures in excess of this amount were available throttling is not necessary. Curve Sheet II shows the Suction in Inches of Mercury as well as the computed Suction Lift in Peet, plotted against operating pres sures at the eductor. This curve will indicate the height at which material can be lifted under various working pressures and it is significant to note that the equipment would be applicable to the usual type of underground horizontal storage tank. MISCELLANEOUS NOTES ON REQUIREMENTS POP OPERATION Water Pressure Prom a preliminary check, it is evident that most bulk plants have a municipal supply of water available, v/ith a main in excess of 2" and an outlet no smaller than 3/^", Pressure is usually in excess of 30#/sq. in. Pump A pump is recommended as part of the equipment, to be placed in the line between the water connection and the eductor, to boost pressure as required. Sven though a minimum pressure is available without the pump, its use, by boosting pressure, will increase Suction Capacity and decrease Time required to do job 0022411 Hose 2H hose has been selected in order to keep to a minimum the pressure drop due to friction losses. Guage The manufacturer of the eductor will make a guage having a nozzle the duplicate of that in the Eductor. With a pressure guage attached, working pressure at any point can be determined in advance. SqpiPMEFJ? AND APPROXIMATE COST 1 - Schutte-Koerting Special 2" Eductor (Brass) (Water Jet Cesspool Pump - Pig. 222). $ 69.00 1 - Motor Pump - Centrifugal Type - 25 GPM - 65 Pt. Head 1 3P Explosion Proof Motor 100.00 200 Pt. 2" Smooth lined non-kinking hose, suitable for pressure or vacuum 170.00 Miscellaneous valves, fittings, gages, probe, nozzles, etc. ' 100.00 $'439.00 Sound figure cost $^-50.00 SUMMARY 1. Experience has shown that the fundamental principle described is applicable to tank cleaning. So far no tanks have been cleaned on this basis, primarily because the equipment necessary was not available at the time of an actual tank cleaning. In spite of this, material heavier than normal sludge, and of approximately the same consistency, has been successfully removed from an underground tank. }v 2. There is need for further experimental Work to refine equipment. 3. The probe and tools designed and developed by Jim Boudreau would be used to advantage on the suction side of the eductor. U. There is need of an accurate survey of operating conditions at t various representative bulk plants in order to determine the limitations KE 002242 of the use of the equipment of this type. (A rough estimate indicates that more than 75$ of bulk plants have suitable conditions). I would recommend that a complete set of equipment be assembled for use and then made available to various oil companies for tise>. under actual tank cleaning conditions. 5. It is significant to note that the Shell Oil Company has for a number of years been using a completely equipped truck for the clean ing of underground service station tanks and fuel oil tanks. The equipment they use is somewhat similar to that described in this re port. That is to say, the principle used for removing material is an eductor. In this connection thejr have offered their cooperation which insures the loan of one of their trucks for any experimental work which we may wish to do. tf? 0022413 SCHUTTE &KOERTING COMPANY IV WATER JET CESSPOOLPUMPS THE fi Water Jet Evacuator or Cesspool Pump, Fig. 222, is usedtohandle liquids containing solid matter. The arrangement of suction anddischarge connections allows pas sage of this solid matter through the pump. Waterunder pressure is usedasthe operating mediumandthe entrainment actionof the jet of pressure water draws in the liquid to be pumped. The AWater Jet Evacuator has no moving parts and little attention is required, as the operationcanbe closely regulatedby asingle valve in the pressure water line. These jet pumps are better suited for cesspool cleaning or similar service than pumps of other types. Where thereis alarge amount of solidmatter in the liquid to be handled, a mushroom strainer shouldbe used on Evacuator suction line. CAPACITIESANDPRICES OFf, WATERJETCESSPOOLPUMPS, FIG. 222 Suction Connections, Inches Size Capacity Gals. Per Hour Pressure Water Suction and Discharge List Price Brass Iron Code Word Brass Iron W2 720 34 "2 1,350 1 2 3 3,600 IV2 3 4 6,600 2, 4 $52.00 69.00 104,00 173.00 $16.00 38.00 81.00 104.00 Cyanic Cycloid Cyclic Cyclometer Cycling Cydonal Cyclist Cyclone Page 2230 2-M WATER JET EDUCTORS &WATER JET SAND AND MUD EDUCTORS FIG. 224 SANDANDMUDEDUCTORS are recom mended for pumping out wells, pits, etc., where there is anaccumulationof sand, mud, slime, orothermaterial of anature not easily handled bv the standardWater Jet Eductors. FIG. 224 Mud Eductors are likewise well suited to handle the heavysludges forming the residue fromrefiningoperations inoil plants or from otherindustrial processes. CAPACITIES, PRICES ANDDIMENSIONS OFA WATERJETSANDANDMUDEDUCTORS, FIG. 224 Suction Size ! Capacity iGals. Per Hour Connections, Inches Pressure Water List Price Code Word Discharge Weight Lhs. Dimensions (Inches) AB 1% ! 2% 750 2,600 3 ! 4,000 4 1 7,000 *5 j 11,000 *6 15,500 i 2 2i/2 3 4 5 U/2 $58.00 Cystic 10 9% 4% 214 69.00 Cystose 35 16% 7% 3 95.00 Cytode 75 16% 77a 4 160.00 Cyv 120 25% 11 5 250.00 Cyvas 200 30% 17% 6 360.00 Cyvor 300 39% 19% *Have flanged ends. 6SandandMudEductors areusuallymade sive liquids, theycanbe made of Everdur or incast ironwithbronze pressurenozzles. For of other suitable metals, handling pickling solutions and other corro- 2-M Page 2229 0022415 KE 0022416 i r~ " 0022417