Electric motors explosion-proof

Piping and pumps used for transfer of the butanols can be made of the same metal as tanks. Centrifugal pumps with explosion-proof electric motor drives are recommended (34). 

Electric motors to be Drip proof Splash proof TEFC Explosion proof ... 

For in-house correlations, the cost of electric motors should be correlated vs. horsepower with voltage, speed, and type of construction as correction factors or parameters. Correction factors for explosion proof or open drip-proof housings could he developed if most of the data is for TEFC (totally enclosed fan cooled) motors. Similarly, correction factors could be developed for 1,200 rpm and 3,600i pm with l.SOOrpm as the base. 

For facilities that include large numbers of motors and other electrical equipment, it normally is both more economical and more convenient to furnish a building to enclose the required motor starters and distribution panels. This building is normally referred to as a motor control center (MCC). In addition to typically allowing less expensive non-explosion-proof equipment, these buildings are frequently environmentally controlled (air conditioned, and possibly heated in colder climates) to reduce equipment corrosion and enhance reliability. Maintenance is more easily performed indoors than if the equipment were installed outside and maintenance personnel were subject to extreme cold, rain, snow, or other adverse weather conditions. 

Define plant areas requiring explosion-proof, drip-proof and open motor and associated electrical components. Refer to National Electrical Code and National Electrical Manufacturer s Association Standards. 

Starch dust can produce an extremely explosive mixture with air. All motors in confined areas must have explosion-proof ratings. The silo and all conveying equipment must be grounded to eliminate static electricity. Furthermore, starch silos must be equipped with an explosion relief deck to provide an escape route in case of a dust explosion. Another requirement is a vacuum relief valve to prevent the silo from caving in, in case a starch bridge in the silo suddenly collapses. The starch content in the... 

Explosion-proof motors are required to meet the National Electrical Code Standards for use in hazardous conditions. These are used where gas, dust, or vapors may be in hazardous concentrations and a spark from the motor could cause a fire or explosion. 

Should motor be standard open, totally enclosed or explosion proof Give voltage, phase, and cycles of your electric current ... 

Purchase Price Typical purchase prices, including drive motors, of tubular and disc sedimenting centrifuges are given in Table 18-16. The price will vary upward with the use of more exotic materials of construction, the need for explosion-proof electrical gear, the type of enclosure required for vapor containment, and the degree of portability, and this holds for all types of centrifuges. 

Motor J hp, split-phase induction, 60-cycle, 110-volt, a-c, General Electric explosion-proof motor... 

The AMDR is equipped with some instruments that are used to detect the surrounding environment and transfer information back to the control centre. The explosion risk is very high when these instruments and equipments in service. So, we should use the intrinsically safe electrical equipment or other special design for the electrical equipment. In principle, the flame-proof equipment is not allowed to use in mine. But the intrinsically safe electrical equipment is very rarely at present, especially the power supply, motor and other key equipments. Therefore, the AMDR adopted the safety strategy of flame-proof after the redundant safety measures drawn up in the case of the basic principles of electric explosion-proof allowed. 

For Case 2, each DVP requires 72.66 kWh of electricity, and operating cost savings due to this modification are US 257 801/year. Installed cost of two DVPs, based on vendor quotation, is US 400 000. So, payback period for this retrofit modification is 1.6 years. Thus, replacing the existing SJEs by DVPs is attractive for low capacities and non-hazardous applications such as a steam turbine s surface condenser vacuum system. DVPs are efficient, they require less electricity and so modification required at the substation is minimal. They are very compact and can be installed at ground level or on elevated platforms. Depending on the area classification of their location, explosion-proof motors may be required. 

Because of the possible flammability hazard of 1,2-dichloroethane, specify an explosion-proof electric motor to drive the pump. From Table 16.22, for 3,600 rpm, Fp — 1-8 and using Eq. (16.20), but with added updating of the CE cost index to 400,... 

Estimate the total bare-module cost for installation of nine 600-Hp centrifugal compressors of carbon steel with explosion-proof electric motors, a stainless steel direct-heat rotary dryer of 6-ft diameter by 30-ft long and a continuous stainless steel scroll solid-bowl centrifuge processing 20 ton/hr of solids. 

The safe design of components is one of the prerequisites for a safe plant. It is the task of experts of the area in question. For example, explosion proof motors are designed and built by electrical engineers. The great variety of technical components and their safe design, which is component-specific, are not discussed here. The concern rather is the safe design of plants and processes. This refers to the following areas [6] ... 

Notes 1. May require special duct to outside, in-line charcoal Idto", explosion-proof motor and spark-proof electrical components. 2. Air pressure in the internal plenum is positive with respect to the room 3. Air pressure in the inl nal plenum is negative with respect to the room. 4. N/A = not... 

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