Blower Safety

Start and run the equipment in an upright position. Operate the blower with tubing attached and direct the discharge of debris away from people, animals, glass, and solid objects that could cause material to ricochet. Never use blowers while on elevated or unstable surfaces. Never use blowers to apply pesticides, fertilizers, or other toxic substances. 

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A typical large three-phase ferroalloy furnace using prebaked carbon electrodes is shown in Eigure 4. The hearth and lower walls where molten materials come in contact with refractories are usually composed of carbon blocks backed by safety courses of brick. In the upper section, where the refractories are not exposed to the higher temperatures, superduty or regular firebrick may be used. The walls of the shell also may be water-cooled for extended life. Usually, the furnace shell is elevated and supported on beams or on concrete piers to allow ventilation of the bottom. When normal ventilation is insufficient, blowers are added to remove the heat more rapidly. The shell also may rest on a turntable so that it can be oscillated slightly more than 120° at a speed equivalent to 0.25—1 revolution per day in order to equalize refractory erosion or bottom buildup. 

Batch Process. In the batch process (Fig. 5), the feedstock is preheated in a tube furnace or heater placed between the feedstock storage and the blowing vessel. The air supply is provided by a variety of blowers or compressors and a vertical-tower vessel is preferable for air-blowing. Knockout dmms, water scmbbers, incinerators, furnaces, and catalytic burning units have been used for fume disposal (32). Steam is used for safety and to ensure positive fume flow to the incinerator. 

The normal procedure to set design ratings for the blower is to calculate the blower design discharge pressure required for the design flow. Applying whatever safety factor is considered necessary, a design... 

The foregoing comparison of different valve arrangements for both full main air blower trains and TPG trains emphasizes its importance. The range of desired regenerator control, expected modes of operation, and system constraints all influence the choice of valve aiTangements. The selected arrangement depends on safety consciousness, cost considerations, and desired process flexibility. 

NOTE Soot blowers are typically employed only on WT boilers and may be regarded as appurtenances because boiler safety and reliability is directly related to the cleanliness of the heat transfer surfaces. Boiler performance and efficiency also depend on the same heat-transfer cleanliness factors. 

Firedamp Recovery. Firedamp is essentially the same as natural gas and has value as a fuel. Recovery is practiced in Europe both for safety purposes (firedamp removed from the mine is no longer an expin hazard in the mine) and as a by-product for economic reasons. Recovery by several methods is possible. Some of these are cross-measure borehole methods from working galleries, boreholes from roads outside the seam being worked, superjacent heading method, suction, pack cavity method and blowers (Ref 3)... 

Blowers -role m plant safety [PLANT SAFETY] (Vol 19)... 

Safety requirements at wastewater treatment facilities. Chlorine storage, solids handling, laboratory, blowers, pumps, basins, and vehicle maintenance. Produced by Trinity River Authority, Grand Prairie, Texas. 

Boiler cost estimates include fittings, refractory, insulation and cladding for outdoor installation, internal piping, platforms and stairs, burner and flame safety equipment, economizer, force-draft fan plus drive and soot blowers. 

Liquid nitrogen is available nearly everywhere. Small liquefiers for laboratory use are also on the market. For transport, safety cans in various sizes are used. The liquid nitrogen is either decanted by means of a tilting mechanism or with a small siphon, which can be made by any glass blower (Fig. 16). 

Fig. 19 3. Members of the Aeromedical Isolation Team (AIT) prepare to transfer a patient from a stretcher isolator into the Biosafety Level 4 (BL-4) isolation suite at the U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland. The interior of the isolator is maintained at a pressure negative to the external environment by a high-efficiency particulate air (HEPA) filtered blower. The isolator can be attached directly to a transfer port, visible on the external wall of the building, to allow movement of the patient into the suite without exposing the environment to the patient. Team members are seen wearing protective suits and positive-pressure, HEPA-filtered Racal hoods (manufactured by Racal Health Safety, Inc, Frederick, Md). Photograph Public Affairs Office, Fort Detrick, Frederick, Md.

Limit switch- A safety control that automatically shuts off a furnace if it gets too hot. Most also control blower cycles. 

There are other engineering factors that affect the fire and explosion hazard, e.g., engineering standards of the structural steel and foundations, process equipment, heat exchangers, feeding system, fan and blowers, storage vessels, electrical equipment, instruments, and fire protection and safety equipment. Considerable assistance in design also can be obtained from relevant codes of practice. The responsibility for safe operation rests with the manufacturers of equipment and products as required by national law (e.g.. Factories Act and Health and Safety at Work Act in the United Kingdom). 

Safety precautions include an automatic oxygen trip if the roaster blower trips out or if the roaster air rate decreases to a level where the oxygen concentration exceeds a safety limit of 26%. Oxygen injection may be manually switched off to any roaster in an emergency by means of an emergency cut-out switch in the acid plant control room. Also, the oxygen supplier is on twenty-four hour standby for technical or supply problems. 

Accompany with the RVCS, a shutdown cooling system(SCS) is proposed in the paper to provide a simple and reliable decay heat removal during normal shutdown period. The system is shown in Fig 3. It consists of an auxiliary blower, a cooler as well as a recuperator. Because the cooler and recuperator are also the parts of the RPV cooling system(RVCS), SCS is simple and its equipments have multi-function. The decay heat removal under the accidental conditions is depends on the passive reactor cavity cooling system. The SCS proposed in this paper therefore is not safety concerned. 

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