Design static electricity prevention

Mi.xers and agitators designed for flanmiable liquids or dusts sliould be constructed to minimize fire and explosive possibilities. Electrical equipment should follow the requirements of the National Electrical Code. Equipment should be bonded and grounded to prevent the accumulation of static electricity. 

While fabric filters have relatively low capital coats, their operating costs are high. Well maintained fabric filters can reliably reduce dust concentrations to below 50mg/Nm. Where incompletely combusted fuels are likely to be present the bags should be earthed, to prevent build-up of static electricity, and the filter housing should incorporate a suitably designed explosion vent. 

Includes safety boots or shoes with steel toe caps foundry hoots with steel toe caps, which are heat resistant and designed to keep out molten metal Wellington boots to protect against water and wet conditions and anti-static footwear to prevent the huild-up of static electricity on the wearer. 

Sturdy safety shoes should have impact-resistant toes and heat-resistant soles to protect against hot work surfaces common in roofing, paving, and hot metal industries. The metal insoles of some safety shoes protect against puncture wounds. Safety shoes may also be designed to be electrically conductive to prevent the buildup of static electricity in areas with the potential for explosive atmospheres, or noncon-ductive to protect workers from workplace electrical hazards. All safety shoes must comply with the ANSI standard(s) mentioned above. In addition, depending on the types of worker exposures, there may be a need to provide specially designed safety shoes such as conductive or electrical-hazard safety shoes. 

The vapors of the organic solvents used in the preparation of cellulose ester solutions represent a potential fire, explosion, or health hazard. Care should be taken to provide adequate ventilation to keep solvent vapor concentrations below the explosive limits. Mixing equipment should be designed to ensure that solvent temperatures do not approach their flash point during the mixing cycle. All equipment must be electrically grounded to prevent static discharge, and appropriate precautions should be followed as recommended by the manufacturer of the solvents. 

Lightning is a static discharge between the earth and a storm cloud. While external to a process, it is an important problem because of its intensity. Lightning protection reduces hazards to life and equipment and helps to prevent electrical service interruptions. The choice and design of protective devices depend on ... 

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