Tanks, coating

Compatibility and Corrosion. Gas turbine fuels must be compatible with the elastomeric materials and metals used in fuel systems. Elastomers are used for O-rings, seals, and hoses as well as pump parts and tank coatings. Polymers tend to swell and to improve their sealing abiUty when in contact with aromatics, but degree of swell is a function of both elastomer-type and aromatic molecular weight. Rubbers can also be attacked by peroxides that form in fuels that are not properly inhibited (see Elastomers, synthetic Rubber, natural). 

Tanl . Coatings for Hquid cargo tanks ate selected according to the materials that the tanks (qv) ate to contain. Tank coatings protect the cargo from contamination and must be compatible with the material carried. Epoxy systems ate most frequendy selected because they perform well with both aqueous and organic products. A carefully appHed three-coat epoxy system having a dry-film thickness of 225—300 pm can be expected to last for 12 years. 

Based on past experience, it has been found that the protection current density for buried storage tanks coated with bitumen is over 100 /xA m. With coatings in very good condition, it can amount to a few tens of jiA but for coatings in a very poor state, it can rise to a level of mA The protection current demand can... 

Tank-farbe, /. tank coating, -holz, n. wood for producer gas. -schiff, n. tank ship, tanker, -wagen, m. tank car tank wagon. 

Annex II lists all those materials and components that are exempt from 4(2) (a). Eor example lead as an element (i.e. steel upto 0.35% lead by weight, aluminium, copper), lead compounds in components (i.e. batteries, petrol tank coatings, vibration dampers, stabilisers in protective paint), hexavalent chromium (used as coating on various key vehicle components) and mercury (as can be found in bulbs and instrument panel displays). As ruled in 4(2) (b), the Commission shall regularly amend Annex II, i.e. review all substances that are currently exempt from 4(2) (a). If the use of any of the materials or compounds listed in Annex II can be avoided, those substances will be deleted from this Annex. 

Precipitation of the coating from aqueous solutions onto the suspended Ti02 particles. Batch processes in stirred tanks are preferred various compounds are deposited one after the other under optimum conditions. There is a very extensive patent literature on this subject. Continuous precipitation is sometimes used in mixing lines or cascades of stirred tanks. Coatings of widely differing compounds are produced in a variety of sequences. The most common are oxides, oxide hydrates, silicates, and/or phosphates of titanium, zirconium, silicon, and aluminum. For special applications, boron, tin, zinc, cerium, manganese, antimony, or vanadium compounds can be used [2.40], [2.41],... 

Protective Coating, Integral Fuel Tank Coating, Polyurethane, Rain, Erosion Resistant Resin-Acid Metal Pretreatment Compound for Aircraft Cement Rubber... 

The 50% aqueous acrylamide is the preferred form because it eliminates the handling of solids and because its cost is lower. This is a result of the new manufacturing method put into effect in 1971. The aqueous form is applicable to nearly all the end uses of acrylamide when volume is taken into account. Aqueous acrylamide is shipped in tank trucks, rail cars, or dmms, but small samples can also be obtained. The solution should be kept in stainless steel or in tanks coated with plastic resin (phenolic, epoxy, or polypropylene). All containers, including tank trucks and rail cars, must be rinsed prior to disposal or return. When shipping costs are an important consideration, solid acrylamide may be the desired form. Acrylamide should be stored in a well ventilated area away from sunlight. The temperature should be under 30°C, and under these conditions no change of quality should be noticed for at least 3 months. Typical specifications for the 50% aqueous solution are shown in Table 5 and for the solid monomer in Table 6. 

Table VII shows three asphalt coatings used In thicknesses comparable to Industrial paints. Film thicknesses are from 0.7 to 3 mils. These coatings find wide use In Industry for the protection of structural steel, for the protection of metal parts In storage (removable with solvents), and as pipe and tank coatings. The aluminum pigmented coating has two main advantages aluminum appearance Is more desirable than black, and the pigment protects the bitumen from the actinic rays, thereby extending the life of the coatings.

LP . (Morton Int l.] Polysulfide polymers base for sealants in construction, transportatitm fields and for casting com., elec, potting conq ds., and fuel tank coatings. 

Dimethyiethyl)aminolethyl 2-methyl-2-prop-enoate. 4-04-00-01509 (Beilstein Handbook Reference) Ageflex FM-4 AI3-61480 BRN 1761825 2-(tert-Butylamino)ethyl methacrylate N-tert-Butylaminoethyl methacrylate 2-((1,1-Dimethyiethyl)amino )ethyl 2-methyl-2-propenoate EINECS 223-228-4 Ethanol, 2-(tert-butylamino)-, methacrylate (ester) HSDB 6111 Methacrylic acid, 2-(tert-butylamino)ethyl ester Methacrylic acid, 2- tert-butylamino)ethyl ester 2-Methyl-2-propenoic acid, 2-((1,1-dimethylethyl)-amino)ethyl ester 2-Propenoic acid, 2-methyl-, 2-((1,1-dimelhylethyl)amino)ethyl ester. Used in automotive dip tanks, coatings, industrial/consumer adhesives and coatings, dye and lube oil additives, intermediate for water treatment chemicals, oil-water separations. Liquid dJ5 = 0,914. Rit-Chem. 

The influence of moisture on the dielectric properties of three experimental resin casting systems and an epoxy based laminate is investigated in this chapter to see if the mechanisms described above, can be recognised. Besides, the resistivity of an epoxy based tank coating and that of plasticised PVC cable insulation material in contact with water is described. 

The electrical properties of a series of eight different tank coating systems in contact with respectively seawater, crude oil and kerosine were determined [2], as a part of a tank coatings research program. The results measured for one of these coatings, an epoxy coal-tar system cured with an amine adduct (26 %wt. binder, 35 %wt. coal-tar and 39 %wt. talc/ barytes pigments) are reported in this chapter. 

To prevent corrosion of double-hulled tanks, coatings with corrosion resistance at temperatures of 70-90 C and resistance to MIC as well as resistance to acid attack in the ullage were found desirable. Because of the flexing of HT steel, the coating needs to be flexible and does not become brittle and break off over time as the ship flexes. The coating should last for 20 years. Solvent-free epoxies satisfied these requirements. 

The important maintenance coating area, particularly for pipe and tank coatings, is served by epoxy systems cured with polyamine or polyamidamines. Two-component, air-dried, solventless systems used in maintenance coatings provide tough, durable, nonporous surfaces with good resistance to water, acids, alkalies, organic solvents, and corrosion. 

Table 11.1. The most important paint systems for marine tank coatings...

D. Banks The Effects of Low Molecular Weight Cargoes on Tank Coating Systems, Proc. MariChem. 85 (1985) 169-172. 

Corrosion may also take place in systems for transportation or storage of oil, e.g. when the fluid for some reason has absorbed water that is precipitated afterwards. This is a known problem in various types of storage tanks. To prevent eorrosion, inhibitors and (particularly in larger tanks), coatings and/or cathodic protection are used. 

Uses Epoxy curing agent for two-pkg. air-dry coatings, e.g., industrial maintenance primers, midcoats, and topcoats, anticorrosive marine primers, zinc-rich primers, methanol-resist, tank coatings, concrete floor coatings... 

Chem. Descrip. Polyamide in Aromatic 100 Uses Curing agent tor adhesives, flooring compds., pipe and tank coatings, marine finishes, castings, potting and encapsulation Properties Gardner 12 color sp.gr. 0.96 dens. 8.0 Ih/gal vise. 2000 cps ... 

Uses Poiysuifide in seaiant/cauik appiics. in building, insulating glass, and marine industries, casting compds., elec, potting compds., and fuel tank coatings... 

Uses Alkyd for high quality architectural finishes, exterior tank coatings, bridge coatings, elec, insulating coatings, railroad finishes, high quality maintenance finishes... 

Uses Alkyd for automotive underbody/underhood coatings, coil coatings, elec, insulating enamels, dip tank coatings, office furniture finishes, drum/ metal container finishes, industrial baking enamels/primers Features Can be used with melamines... 

Uses Automotive dip tanks coating applies. industrial/consumer adhesives dye and lube oil additives intermediate for water treatment chemicals textile chemicals dispersant antistat stabilizer ion-exchange resins emulsifier precipitant acrylic resin comonomer food pkg. Manuf./Distrib. Aldrich CPS Ciba Spec. Chems./Water Treatment Condea Servo Monomer-Polymer Dajac Labs Rohm Tech Rohm Am. 

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