Insulation problems

F. Sherwood-Rowland, Chlorofluorocarbons and Depletion of Stratospheric O ne, Improved Thermal Insulation—Problems and Perspectives, D. A. Brandreth, ed., Technomic Puhlishing Co., Inc., Lancaster, Pa., 1991, pp. 5—25. 

These spherical tanks are not insulated, since the stored liquids approach the ambient temperature in most countries. Also, insulation problems result from water moisture condensing on the metal walls under the insulation. 

Covers mechanical integrity programs for piping, pressure vessels, storage tanks, and process piping, including corrosion under insulation problems... 

Carbon monoxide (CO) is a deadly gas that can form from a reaction between trapped moisture (for example, in the furnace insulation) and carbon. The source of carbon may be the graphite used in some furnaces for heating elements or in graphite-felt insulation. Problems can be avoided by ensuring that the furnace is kept dry. Domestic CO alarms can be installed in the laboratory area as an added precaution. 

Although most portable electric tools have an equipment grounding conductor and many are double insulated, these methods are not foolproof. A grounding wire covdd break or a cord could become defective. Using a GFCI overcomes these insulation problems. 

Guidant Ventak Prizm 2 DR, Renewal, Renewal 2 June 2005 Electrical overstress caused by insulation problem within the header Shorting prevents delivery of effective therapy Prizm 0.1 Renewal (2) 0.72-1.8... 

If the wire is to be used to carry much higher frequency currents, the design problem in geometry and material selection becomes more complicated. A difficult high frequency insulation problem is shown in Fig. 16-2. The dielectric constant and dielectric loss values for the materials become important in the design. At a frequency of one megahertz the effect of the dielectric on the power transmission characteristics of the wire is substantial and, even at frequencies of 10 to 100 kilohertz, the insulation on the wire must be considered as a major electrical element in the circuit. When dealing with low value currents. 

Thermal insulation problems relating to cement kilns were dealt with in considerable detail at the 17th International Refractories Colloquium on the subject of refractory materials in the cement industry ", held at Aachen in 1975. The papers presented on that occasion have been published in No. 5/1975 of the journal "Berichte der deutschen Keramischen Gesellschaft". 

The ultimate solution to the insulation problem is probably the use of ceramic insulation that would be completely radiation resistant. However, considerably more development work will be required before this type of insulation becomes usable. There are data available which indicate that silicone-resin-bonded reconstituted mica (Isomica, trademark name of Mica Insulator Co.) may have better radiation resistance than Fiberglas and silicone varnish. If this material proves to be better from a radiation-damage standpoint, it can probably be incorporated into a pump at a much earlier date than the ceramic insulation. 

E.A. Cherney, RTV Silicone — A high tech solution for a dirty insulator problem. IEEE Electrical Insulation Magazine, Vol. 11, Issue 6, p. 8-14,1995. 

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