Tanker linings Cleaning fuel tank surfaces Concrete mixes may be used as Apparatus for cleaning oil, scale, topped pipes 49 into the compartment anti-corrosion protective coatings on etc., from metal surfaces of fuel tanks 3 where oil and solids separate out and steel surfaces, especially in oil tanker and fittings comprises a pair of com the cleaned fluid passes below the holds. These latter are alternately municating containers, one to receive partition 2 into the compartment 4 filled with ballast sea water and crude cleaning fluid and having therein heat for re-use. A make-up tank 5 supplies oil, which raises a severe corrosion fresh fluid either through a lead 9 ing means, and the other to receive problem. Emulsified polyvinyl ace returned contaminated cleaning fluid, controlled by a ball valve 53 or through tate in concrete is found to be cor and means for projecting the cleaning a hand-controlled lead 6. The valve rosion-resistant for this purpose, and fluid against surfaces to be cleaned. 53 opens when the oil-cleaning fluid sufficiently flexible to withstand the The containers may be formed as a interface falls below a predetermined ship's vibration. A good formulation single tank having an insulated par level 146. An interface level indicator is one to three parts of aggregate to one 60 is fitted. The apparatus may include tition 2 forming compartments 3 and part of cement, with 0.07 to 0.22 of 4, the compartment 4 carrying heating a telescopic projector 61 (Fig. 6) polyvinyl acetate, and all gauging coils 35 and the compartment 3 having adapted to be mounted inside a fuel water being supplied by the emulsion overflow gates 51 and sludge doors 34 tank 84 and having a jet-reaction- if required. This mix is found to have for removal of oil or solids separated operated revolving nozzle head 77. good adhesion to steel when applied at from the returned fluid. Fluid is Elongation of the projector is con one to three-sixteenths inch thickness, trolled by wires 96 passing round a removed from the compartment 4 by either by trowel or spray. Preferably pair of rollers connected to hydraulic a pump 16 through leads 13 and 39 the metal surface is scale-free, and the above and below the coils 35, an rams operated by pressure from the aggregate largely devoid of dust, and it arrangement permitting temperature pump 16. Forcing apart of the rollers is carefully pointed out that this speci control by valves 14, 40. Fluid from by the rams telescopes the projector fication concerns lime cements, the pump 16 is sprayed by projector 61. A two-nozzle hand-operated pro whereas B.P. 666,865, an earlier but jector may be included in the appara means on to surfaces to be cleared and otherwise similar one, relates to tus. The fluid sprayed may include is returned with entrained matter by alumina cements.—Brit. Pat. 732,110, a further pump having a fixed and a solvent and may be mixed in a drum Vinyl Products Ltd., Surrey. a wandering suction lead. The return 12 (Fig. 1) and forwarded by the fluid passes via a preheating coil 43 pump 16 to the tank 5.—Brit. Pat. in the compartment 4 and open- 696,631 (1949), R. W. Groom. High temperature alloys Nickel chromium cobalt alloys have good creep, corrosion and temperature resistance at 750 to 850°C. The chromium content of similar known alloys is reduced to allow the solution of titanium, aluminium and molyb denum to give a composition of: 4 to 12% chromium, 10 to 55% cobalt, 0.5 to 8% titanium, 0.3 to 8% alu minium, 0 to 15% molybdenum, 0 to 0.5% carbon, 0.001 to 0.01% boron, and the remainder nickel. The aluminium and titanium are preferably kept below 5%.—Brit. Pat. 733, 489, Mond Nickel Co., London. Scale-resistant alloy steels A modification is described of the alloy in B.P. 638,110, for scale and creep resistant alloy steels used at 600°C. The chief aim is to develop such alloys which can be welded or brazed without undesirable hardening effects, and have a tensile strength of about 70 tons p.s.i. The main feature is to restrict the chromium content to 16 to 17%, the other components being : 0.3% each of silicon, niobium and vanadium, 0.1% carbon, 0.5% manganese and 0.4% molybdenum, the remainder being iron.—Brit. Pat. 733, 146, William Jessop & Sons Ltd. 284 CORROSION TECHNOLOGY September 1955
Anti-Corrosion Methods and Materials – Emerald Publishing
Published: Sep 1, 1955
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