In 1967, the NFPA Technical Committee on Electrical Equipment in Chemical Atmospheres established recommended practices, entitled "NFPA 496 - Purged and Pressurized Enclosures for Electrical Equipment." Since then, the NFPA has expanded its document by adding recommendations for enclosure ventilation and dilution.
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Defining Hazardous Areas
Today’s modern chemical facilities often contain both flammable gases and ignitable dust, which pose explosion risks. To prevent explosions from happening in harsh environments whereby flammable gases or combustible dusts are present directives and guidelines are put in place to protect both the public, workforce, and environment.
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Equipment in Hazardous (classified) Locations
The need to place general-purpose equipment in hazardous (classified) locations is not new, yet in the last three decades, the need has grown dramatically.
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Electrical Service Types and Voltages
In commercial and industrial applications, voltages can be in excess of 1000kV. Most equipment supplied by DisperseTech will operate at one of several common voltages 208, 240, 480, and 600 volts.
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Paint Formulation
Paint consists of four basic components: Resin Pigment Solvent Additives The performance of a coating is influenced by the selection of these components and the relationship between them. Several rations play an important function in the overall performance of a coating.
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Critical Pigment Volume Concentration
The point where there is just sufficient binder present within a paint to cover each extender particle with a thin layer and fill all voids between particles.
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Pigment Binder Ratio
One of the earliest forms of comparison. The pigment/binder ratio is the weight ratio of the sum of the pigments (pigments and fillers) to the binder solids.
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Pigment Volume Concentration
The ratio of the volume of pigment to the volume of total nonvolatile material present in a coating. The figure is usually expressed as a percentage.
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Properties of Common Solvents
Density, boiling point, evaporation rate, and flash point of common solvents
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Spread Rate
The Theoretical Spread Rate or coverage of a coating is a function of the coating's solids content. This value is useful in comparing coatings systems. In actual applications, there are losses. The practical spreading rate accounts for these losses. Losses result from application technique, losses to wind and environment, application equipment, and type of the substrate to be coated and substrate surface profile.
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Fineness of Grind
The grind gauge is an instrument that indicates the fineness of grind or the presence of coarse particles and agglomeration in a dispersion. It is commonly used to determine how finely ground the particles of pigment are dispersed in a sample of paint.