Safety

31 Aug

High Visibility Industrial Clothing Proves Safety Features Are Invaluable on Construction Sites

Posted in safety on 31.08.10 by Merlyn

Chris A. Harmen asked:




Construction sites around the world all have a unique safety hazard. Visibility on roadways during twilight and night time hours is a safety hazard that cannot be reliably engineered out with improved lighting. Visibility at night time for motorists is extremely limited when it comes to spotting pedestrians or workers on the side of the road. For example, wearing dark clothing limits the visibility of a person to 100 feet at night. Lightly or brightly colored clothing only increases that distance to 250 feet. The total stopping distance for a vehicle, including driver reaction time, is about 600 feet when traveling at 30 mph and 1200 feet when traveling at highway speeds of 60 mph. Clearly, special personal protective equipment is necessary for outdoor work.

Industrial clothing designed to offer high visibility for workers is utilized to create a safer construction site environment. The same types of industrial clothing are also used for utility workers, police forces, emergency medical services, fire fighters, and airport workers. High visibility clothing is also vital to protect workers from on the job accidents as well. Workers driving a construction vehicle on a work site suffer from the same visibility issues as motorists on a highway. That is why high visibility industrial clothing is used on any work site during low light hours or any environment that cannot be well lit at all times.

Clothing Visibility Standards

Not all high visibility clothing is created equal; merely wearing bright colors is not enough to protect workers. The American National Standards Institute has put forth requirements for the proper industrial products that can be classified as high visibility. Following the set standards will ensure that workers are visible and the job site is in compliance.

The basis for meeting the ANSI standard 107-2004 that governs high visibility safety apparel is retro-reflective materials. When light from a light source hits an object, light beams are scattered in every direction. Retro-reflective materials concentrate the reflected light into the same direction that it came from. These materials increase the visibility distance for clothing dramatically without using a power source or heavy equipment.

Standard 107-2004 has designated three classes of high visibility outfits for use on the job. Any outfit that does not include retro-reflective bands or threads does not qualify for the standard, so wearing a neon orange shirt is not enough protection. The proper clothing for a class 1 high visibility suit is a vest with the proper reflective material and a reflective band two inches wide that circles the torso and shoulders in addition to reflective strips on the headwear worn. This is the minimum level of protection on lower risk job sites. Class 1 is a good choice for daytime applications in combination with fluorescent colored clothing.

Class 2 adds full sleeves and an additional reflective band at the waist to provide a better outline for the human shape. This class is appropriate for low-light conditions such as twilight and early evening, construction sites at night with flood lighting, and low-light work sites. The highest class, class 3, includes trousers or coveralls that additionally outline the waistline and ankles and is appropriate in the darkest work environments. Class 3 will provide visibility at a minimum distance of 1280 feet, leaving enough stopping distance for vehicles traveling at typical highway speeds.

Additional High Visibility Guidelines

The proper fit for any piece of industrial clothing is as important as its visibility properties. Loose clothing will result in injury as industrial products with moving parts can snag onto extra material and pull a worker toward an operating machine. There are hundreds of yearly deaths and thousands of injuries and amputations as a result of baggy clothing on job sites. On the other hand, clothing must not be so tight so as to restrict movement in a situation where a worker would need to avoid an accident or quickly leave the area of a recognized hazard.

The color of the apparel worn is also an important factor. The best colors offer a contrast with the surrounding environment. Using a fluorescent orange color on a worksite with orange industrial products and machinery is not effective. Always choose a color that will not blend in with anything else on the work site. Good choices are fluorescent version of orange, yellow, lime green, or an intense white or silver.

Following high visibility industrial clothing standards is the best way to protect workers for the hazards of night and low light work environments.

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30 Aug

How to Make the Office Workplace Safe

Posted in safety on 30.08.10 by Merlyn

Mark S Myers asked:




Safety is one of the important issues in the workplace. The question that arises in the mind of all employees and their supervisors is “How safe are we?” Safety is a serious concern with regard to industrial and manufacturing areas but accidents also do occur in an office.

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30 Aug

INDIAN ELECTRICITY RULES AND INDUSTRIAL SAFETY

Posted in safety on 30.08.10 by Merlyn

Paramesh Malakar asked:




 

Paramesh Malakar.

B. Sc. (Engineering), BHU

 

 

INDIAN ELECTRICITY RULES AND INDUSTRIAL SAFETY

Indian Electricity Rules are very broad and wide guidelines for design, manufacture, construction, operation and maintenance of all electrical installations and Industrial Safety rules are inbuilt into it. These rules, being the body to cover all aspects of Electricity seems to be, at many a point, ambiguous and extraneous. However, an in-depth interpretation of these rules indicates the elements that need compliance to have a proven system to strong, reliable and safe.

It is felt to be utmost importance to discuss the safety aspects of electricity as electricity in various forms has become indispensable to the modern industry for maintaining propriety of generation, drive, control, communication, , announcement,  safety and managing disasters.

Generation and handlings of power is given primary emphasis in this article as these are considered injurious to apparatuses and life.

An approach here is made to proceed from basic needs in simple language so that the contents are accessible to nonprofessionals also along with engineers since many such persons are being engaged in electrical work.

CONTENTS: INTRODUCTION CLASSIFICATION OF AREAS MAJOR COMPONENTS OF INDUSTRIAL INSTALLATIONS IMPORTANT RULES GENERAL SAFETY ASPECTS SELECTION OF APPARATUSES INSTALLATION OF APPARATUSES CAPACITY UTILIZATION AND OPERATION ROUTINE HEALTH CHECKUP MAINTENANCE OF STATISTICS   PERSONNEL SAFETY RULES 

 

INTRODUCTION

Safety at the dawn of civilization was included in the three basic needs. Food, Shelter and Clothing gave man the safety he needed. Inventions and the development the inventions brought about in mechanizing man’s ways demanded more safety. Safety took birth as a concept and to-day it has become a branch of engineering studies. Speaking commonly about safety is to imply use of safety appliances like welding goggles or radiation shields while doing welding or operating X-ray machines. However, if hazards of discharges, explosions, accidental contacts, possibility of lightning etc. are considered it will become apparent that  safety considerations are to begin with design of machines and systems and are to be systematically inbuilt through manufacturing, installation and operation of plants and equipments.

The hazards faced are unpredictable and inestimable. But, while dealing with industrial hazards it is seen that these hazards are contained in definite and demarcated systems. In case the deficiencies of a system are known these can be eliminated by suitable design and working procedures.

Electrical safety aspects of industrial installations are related mainly to healthy operation during running, abnormal shutting down, switching in and out and maintenance working. Such electrical safety is not difficult to ensure if proper approach is adopted from blue-print-stage.

CLASSIFICATION OF AREAS  

An industry is a unit, which processes inputs to obtain final product ? output. The nature of environment at different locations inside the industrial area is continuously changed due to abnormal operation and generation of wastes and pollutants. These locations may become HAZARDOUS from the point of view of electrical engineering depending on their degree of flammability. It is very essential that only proper electrical appliances and apparatuses are chosen for such areas which are turned hazardous by plant processes. Again rain, humidity, dust are also harmful for electrical installations.

Area, which does not have any risk of fire in their environment, is safe. In such safe area apparatuses designed and manufactured to meet the rated duty can be installed.  However, where risk prevails the areas are hazardous. Hazardous areas of industrial installations are grouped into Divisions (Ref. IS5572) depending upon the presence \ occurrence of flammable gas or gas mixtures in ion it.

These are:

DIV 0: Where risk of fire is constantly present.

DIV I: Where risk of fire is present during normal operating condions.

DIV II: Where risk of fire is present during abnormal operating conditions.

These areas demand different safe features to be built into in electrical apparatuses as integrated features to make these suitable for such locations. In Div 0 areas electrical apparatuses, as far as practical should be avoided. However, if at all necessary flammability in the area is to be precisely defined and intrinsically safe units are to be installed.  In Div I and II areas where explosive gas concentration is present but is within limit FLAMEPROOF APPARATUSES ( Ref IS 2148) or  INCREASED SAFETY APPARATUSES (Ref. IS 6318) are to be used. Areas where rainfall, foreign matter and humidity become matter of concern enclosures of electrical apparatuses are to be WEATHER PROOF ? e.g., as per IS 4691 for induction motors, IS 2147 for LV switchboards and suitably protected against entry of foreign matter as contained in these standards. Electrical apparatuses are also available in pressurized, non-sparking, weatherproof etc type for installation and use in specific areas. MAJOR COMPONENTS OF INDUSTRIAL INSTALLATIONS

Industrial electrical installations mainly comprises of :   a) Outdoor \ indoor sub stations,  b) HV \ MV switchboards,  c) LV PCCs & MCCs,  d) Transformers,  e)   Motors,  f) cable network,  g)  Overhead lines,  h) switching stations, i) heaters, j) refrigerators,   k) lighting systems etc. For safety of these, certain rules in the IE Rules are laid down. These are to be meticulously adhered to.

IMPORTANT RULES

The important clauses are:-

IE Rule 29: Rule 29 make provision for ample power handling capacity, size, and strength. This rule says that any electrical apparatus, network or system must have sufficient capacity to handle the power \ energy required to do the specific job, its size must be adequate to handle the power requirement and must be convenient for use and it must have sufficient mechanical strength to avoid danger to human life or items in immediate vicinity. IE Rule 50: Rule 50 makes provision for application of suitable switches, breakers on primary, secondary sides of transformers, controllers of motors and use of suitable insulating materials. IE Rule 66: Rule 66 provides for metal-sheathed conductor system or for cable network the level of fault currents available to the rating of feed isolating switchgear or fuse gear on occurrence of fault. These IE Rules include electrical apparatuses for handling and use of electrical power and consider the aspect of amply designing and manufacturing these items. Such is also gets envisaged that suitability of use \ application of these is taken taken care of during blue print stage. These rules taken together with relevant Indian Standards grants details, which need consideration regarding safety of apparatuses in use. In addition to setting broad guidelines for manufacturing, I E Rules also provides for installation and testing of electrical apparatuses and systems; and various safety measures to be adopted while erection and commissioning is hand. IE Rule 51 : Rule 51 provides for sufficient inbuilt mechanical strength of electrical apparatuses, enclosing electrical live parts in earthed metal enclosures and installation guidelines as to permissiveness of space near switchboards for movement of working personnel. Rule 60,61 : Rule 60, 61 make it necessary to earth properly the electrical systems and testing it to ensure tat installations do not have hidden defects. Rule 64, 66, 67 : these rules make it necessary to have safety incorporated into the installations by means of protections, safety drains and soak pits, for transformer oil, preventing oil accumulation in trenches, arranging layouts such that faulty electrical component can be isolated immediately. These also provide for various tests regarding voltage withstand ability and insulation condition to ensure system capability to withstand over voltages and handling safely the fault currents. These also take care regarding safe earthing of electrical systems at different locations to avoid danger. GENERAL SAFETY ASPECTS

The general safety aspects of industrial installations are to take care of the followings at different stages:-

SELECTION OF APPARATUSES

During selection :

Classification of areas. Selection f apparatuses suitable for the particular area. Taking proper care against possible misinterpretation of short descriptions like ? fire proof, flame proof, weather proof, submersible, relative humidity etc. and to properly establish their relation to actual working environment. Taking proper note to the short time and continuous duty ratings and relating the various operating parameters to the limiting values for safe working.

 

INSTALLATION OF APPARATUSES

During Installation :

Name plate and Rating plate details to be related to the apparatuses and their proper installation referring to relevant IS Standard wherever applicable. The working safety of the location and proximity to other equipments for safe working and maintenance. Cable terminations and all connections should be of suitable type and size done by approved methods. Details designed for earthing and lightning arresters systems shold be strictly followed and any deficiency in execution should be compensated by addition \  alteration as necessary. Due care is to be taken to neutral apparatus earthings. Location of control gear to any electrical apparatus must be so positioned that it  remains accessible during abnormality of apparatus or any other plat abnormality.  Care is to be taken to prevent rain water accumulation and flowing in of surface water into cable trenches. 

 

CAPACITY UTILIZATION AND OPERATION

These broad guidelines and rules thus direct to wards establishing proper relation between the final use and capacity evaluation during design, manufacturing, selecting proper typr for use in different environment, steps to be taken during erection \ installation to make these safe. However, one point is of great importance here as to see how long the apparatus in operation remains intact and manufacturer maintains good margin and some critical properties of electrical apparatuses are lost durin ng operation. Some of these are :-

Di-electrical and physical properties of insulation. Spring tension of various contacts and resulting contact pressure. Ohmic resistance of electrical joints and terminations \ connections. Calibration of protective and measuring instruments and apparatuses. 

In this instance while attention is on suitable capacity and suitable selection the author remembers two instances :-

On a motor – control – centre (MCC) a control fuse was blown in a motor switchgear compartment. Immediately no fault was detected, so the fuse , due to non availability of HRC fuse was rewired and put back. The neutral link was in position. The fault was lurking in the power contactor coil because of inter – turn short. Immediately on insertion of the fuse it blew with heavy sound and caused flash – over on the sleeved bus bars with naked joints running right behind the fuse base. Result was a burn injury to operator’s hand and plant tripping. This is a clear indication of risk involved in over sizing fuses.   In another instance, there was a short circuit on LT switchgear. There the ACB compartment bakelite shutters were riveted to metal strips. While withdrawing the ACB one strip came out, touched bus bars, caused short circuit with heavy arc and fire. Such was the result of wrong selection and application during design and manufacturing. Later on, these strips were replaced with insulated bars.

 

ROUTINE HEALTH CHECKUP

Ageing of electrical apparatuses is a considerable phenomenon. In case of insulation the deterioration of electrical strength may be major consideration in one application (e.g. transformer, reactor) but again loss of mechanical strength may become the major factor in another. For example: the physical strength of insulation is of prime consideration for increased safety motors, bus bar support insulators, line insulators etc. In normal practice a GO \ NO GO indication is monitored on insulation of electrical apparatuses by hand held meggar. But it is necessary that quality measurements are made at specific intervals.

Another hidden danger in aged insulation is that it becomes dry, looses heat carrying capacity and results in development of hot spots. In case of motors it is very critical since motors at times are subjected to repeated starts. The effect if insulation ageing in transformer is a complicated phenomenon. In addition to insulation stresses developing due to high temperature, here the insulation gets exposed moisture and sludge produced in the transformer in the normal operation. As the transformer ages moisture and sludge formation increases in rapidity.  So condition evaluation or residual life evaluation of transformers in operation is highly essential tests as otherwise the transformer may be stressed to limit of fire and explosion on occurrence of any minor spark.

Industrial installations may have an earthing network with an earthing grid system. This grid system is essential to equalize earth potential, control step and touch voltages to within limited values. The grid system contains earth pits and earth strip network and includes equipment neutral earths. During operation, the joints develop resistances. Such resistances remain undetected during earth resistance testing. However, on dead earth faults the fault current distribution gets impaired, flows through routs of least resistance and in occasion leads to melting of connections at points nearest to transformer. This phenomenon becomes pronounced in case of  the location of industry records high rainfall. Water corrodes the jointing bolts, makes the connection loose and also grants fault current paths through electrolytic action. During the time from fault inception to line isolation the fault current travels unpredictably and flows into transformer or generator neutral through the nearest earth pit which remain in direct connection with the transformer or generator neutral. The author has experiences of earth pit connection failure of 25 MVA 66 \ 11 kV transformer neutral end due to earth fault at overhead distribution system. In such instances the feeder was not isolated at Feeder OCB, not isolated at Incomer OCB but the 66 kV feeder tripped on O/C detection at the sending end.  Such occurrences are causes of concern as oil accumulation is often noticed in switchyard and transformer station pits and may cause fire. Such neutral disconnections can give rise to high voltage phenomenon if faulty system remains connected and may cause injury to the electrical installations. 

Changes or departures of characteristics of protective relays in use or getting stuck of moving components of relays in use is not uncommon. Regular checking and calibration of these items are necessary. Protective devices like Buchholz relay on transformers, fire (over temperature) sensing devices to release CO2   cylinders if fails to perform may result in accidents and damage of severe nature. These protective devices are to be kept healthy at all times.

Electrical safety aspects of industrial installations are best considered during design and manufacturing. Such keeps the plants in safe running state. However, plants need operation and maintenance. Electrical safety to working staff is equally important.

MAINTENANCE OF STATISTICS  

It is necessary that accident and abnormal occurrence information are collected and framed into statistical data to indicate the influence of various factors. For example, table 1 below give the accident figures in percentage expressions. This table indicates a) the voltage class of installations where fatal accidents are numerous, b) age group of working staff who are more susceptible to accidents, c) type of installations or locations where accidents are more frequent.

TABLE 1 A.       TYPE OF INSTALLATION    –AND–        NO. OF FATAL ACCIDENTS  AS VOLTAGE CLASS                                                    %

 

H. V. sub – stations                                                       96% L. V. sub -  stations                                                         4% 

 

B.      AGE GROUP OF WORKMEN  — AND—NO. OF FATAL ACCIDENTS

                                                                                               %

20 – 25 YEARS                                                               9%

25 – 30 YEARS                                                             15%

30 – 35 TEARS                                                             18%

35 – 40 YEARS                                                             19 %

40 – 45 YEARS                                                               9%

45 – AND ABOVE                                                        30 %   

 

C. TYPE OF INSTALLATION   –  AND –        NO. OF FATAL ACCIDENTS                                                      HIGH VOLTAGE        LOW VOLTAGE    

Over head lines                                                 15%                                  5%

Accidental contact                                            16%                                  3%

General appliance                                               -                                    15%

Domestic uses                                                     -                                    11%

Sub station equipment                                        8%                                   0.5%

Agricultural uses                                                -                                        8%

Portable lamps                                                   -                                         7%

Consumer’s service lines                                   -                                        5%

Portable power tools                                          -                                         3%

Misc                                                                    1%                                    2,5%  

 

PERSONNEL SAFETY RULES 

Every one recognizes that plant safety riles are invaluable. Once the statistics is prepared or practical, approach is to be adopted in framing the rules with proper judgment based on experience and knowledge. In industries whenever a new technique is developed new problems appear. Safety rules must be kept abreast of the times.

CERTFICATION OF PERSONNEL 

SELECTION OF WORKERS FOR ELECTRICAL JOB IS VERY VITAL. These persons must be suitable for electrical job and and must have the requisite qualification and right attitude for accident prevention. They are supposed to know wheather job taken up conforms to rules and time tested work practices.

INTERACTION OF SUPERVISORS

Maintenance work may necessitate simultaneous jobs to be taken up on different fronts as an integrated network. For example, work may become necessary on a transformer, its HV side breaker and L V side incoming bus duct. In such a situation, there must be thorough understanding of the scope of job among the groups. This makes it essential that supervisors assemble in a conference  and take stock of the details of each job.

COMPOSITION OF TEAM

It is very important that work team consist of the required manpower only. Over or under manning is undesirable. Small teams are preferable. So work planning should be such that small teams are engaged in specific jobs and whenever required small teams are combined to get more workforce.

OPERATIONAL INSTRUCTIONS

While working on H V or M V apparatuses these are isolated from thr source and are made ‘dead’.

But in certain cases of L V systems like industrial control circuits, at times lighting circuits  and in providing temporary connections, work is taken up on live circuits.

Again there is cable demands consideration of the whole tray as live to the voltage level of the live cable.

OPERATION OF ELECTRICAL INSTALLATIONS AND LOCK OUT PROCESSES

In taking electrical circuits out of service it is imperative that effective steps are taken to ensure that it can not be accidentally re-energized. One visible break must be made and it must be suitable ‘tagged’. Safety rules must be strictly observed and wherever locks have been provided their use must be mandatory.

COMPLETING MAINTENANCE OPERATIONS

During maintenance work various temporary connections are provided for hand tols, portable lamps etc. These remains as dangerous connections if  not removed on completion of maintenance work. Care should be taken for proper accounting of all temporary connections.

PERSONAL PROTECTIVE MEASURES.

Personal protective measures to be adopted by working staff are to be taken up with utmost care. It should be kept constantly in mind by the supervisor that his staff members may have some human problem like not getting information about his son who is studying at a far off place, his mind may be preoccupied by his wife’s sickness or he may be constantly thinking about buying a new model car. Whatever it maybe, his preoccupation r anxiety should come to the notice of his supervisor who in turn will take care of the personal outfit of the team member.

The safety measures those form part of general precaution are;

All workmen should wear clothing which will enable them free movement and yet are close fit. Workmen should not wear shoes with wailed soles. Workmen should not use cap with metal frames. Workmen should not wear rings. Workmen should not carry keys, coins, any metal parts on them in open pockets. Workmen should not use spectacles with metallic frames.

 

 

RUBBER GLOVES.

Rubber goloves suitable y insulated for the voltage of line or equipment on which work is to be carried out, must be worn by workmen. However, it must be born in mind rubber gloves only does not qualify working on live lines.

Ordinary rubber coats , boots, shoes, hats etc. should not be considered as protective insulation.

While using rubber gloves care must be taken thst spark or arc can not run through it and worker’s hand remains save from contact with live parts.

SAFETY BELTS

Safety belts must be used while working in locations at a height where ample space and means for support is not available.

Safety belts must be used while working at a height if the worker is to use both his hands.

INSULATED TOOLS

Tools used by electricians (e.g. pliers, tong-testers, fuse pullers etc. ) should be insulated.

The same worker may need to perform the duties of electrician and technicians. In such cases electrician’s tools must be separately kept and properly used.

LADDERS.

Suitable ladders must be used wherever necessary. It shall be borne in mind that taking support from items on walls and roofs which are not meant for such purposes is a dangerous practice.

MAINTENANCE OF PERSONAL MEASURES

Tools and protective devices \ equipments to be used by workers needs be periodically tested and kept such that its condition does not deteriorate in keeping.

 

 

 



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29 Aug

Industrial Battery Safety Guide for Yuasa Sealed Lead-Acid Batteries

Posted in safety on 29.08.10 by Merlyn

Chris Robertson asked:




A Yuasa sealed lead-acid battery is a type of industrial battery that is designed so that during the charging process, oxygen is generated, captured and recombined within the battery. The electrolyte is confined, but the gases escape through a vent or valve if the pressure inside exceeds its threshold.

These types of batteries work well for many industrial and day-to-day purposes, even in cars, boats and power generators. However, you should take the necessary safety precautions while using Yuasa sealed lead-acid batteries. Here are some quick tips for industrial battery safety.

Battery Storage Safety

When storing industrial batteries, be sure the storage area is well ventilated. Also, industrial batteries should not be stored near flames or where sparks can form. For damaged batteries, be sure to label these as “damaged” and store them in containment structures that are acid-resistant.

Tips for Charging Yuasa Sealed Lead-Acid Batteries

When charging industrial batteries, use a charger that is designed for that particular battery. Otherwise, you could permanently damage the battery or cause a fire to occur. The charging area should not be located near where flames, electric arcs or sparks could form. Never over-charge an industrial battery. Always replenish the battery fluid with distilled water.

If in a work environment, be sure there are emergency wash facilities located near the charging and storage areas. Also in both the charging and storage areas, hang signs stating “No Smoking – Flammable.”

Storing and Pouring Acid for Yuasa Sealed Lead-Acid Batteries

When storing acid for industrial batteries, keep the acid away from direct sunlight and be sure the storage area stays cool at all times. Always use nonmetallic funnels and containers. Pour the concentrated acid into the water very slowly and carefully; do NOT pour water into the acid. Wear safety gloves, goggles and arm protection while working with acid.

If you get acid in your eyes, flush them immediately with water for at least 15 minutes, and then seek medical attention. If you get acid on your skin, rinse the skin immediately with lots of water. If the acid burns appear to be second degree burns or worse, then seek medical attention. In case of an acid spill, neutralize the spill with baking soda, and then rinse it with clean water.

Servicing Industrial Batteries

Service industrial batteries regularly and inspect them for loose connections, corrosion on connectors or terminals, cracked areas on the battery case or cover, loose clamps, and defective cables. Replace any worn or torn parts. Clean the battery terminal and clamps with a tapered brush and a baking soda solution, but be careful not to touch both terminals simultaneously as this can cause shock. Be sure to follow the Yuasa sealed lead-acid battery manufacturer’s guide when replacing or repairing the battery.

Follow these tips to use Yuasa sealed lead-acid batteries safely and effectively. You’ll get longer use out of the batteries, and will also protect yourself and others from injury.

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29 Aug

Safety glass is a necessity these days

Posted in safety on 29.08.10 by Merlyn

Paul Johnson asked:




Toughened glass which is also known as tampered glass is stronger than the normal glass because it is subjected to chemical and thermal treatments while processing. The internal stress of these glasses is balanced to increase the strength. These are tough to break and when they do break, they don’t have those sharp edges which can hurt someone. Toughened glass are used at many places like in applications which demand a strong glass, windows of homes and vehicles, tables and glasses fitted on doors, etc. Building up huge structures of glass always requires the toughened glass to be used because of its exceptional strength. Some of the properties of these glasses to which people must be acquainted with are as follows:

Its strength is the main property because of which it is widely used. When they fail, they break up into very tiny pieces thus rendering harmless compared to the normal sharp edged broken glasses. Toughened glass is prone to get damaged by Hydrofluoric acid.



In the year 1927, automobile industries and manufacturers started using laminated safety glass for the windshields of their automobiles. To make the normal glass stronger, a plastic film known as polyvinyl butyral was used between the layers of the glass. These are very tough to penetrate and can be used to stop bullets from penetrating through. Following are some other advantages of the safety glass along with its uses:

It does not allow the passage for high frequency sound reducing disturbance and noise pollution. The ultraviolet radiation of the sun which is very harmful to humans and furniture is blocked by these glasses. The thermometers which we use to measure are body temperature is made up of this glass.

Some of the other things which use this glass are greenhouse windows, partitions at the offices, etc.



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28 Aug

Needful Factors That Can Greatly Serve You Prefer Your First Safety Boots

Posted in safety on 28.08.10 by Merlyn

Larry Mundson asked:




If you are functioning in an surroundings similar construction places, mines and refineries, industrial plants and chemical manufacturing plants, chances are your danger of inducing bruised is highly attainable because of the unreliable operating conditions you sustain. That is why it is very key to be outfitted for this form of tasks to avoid accidents in the future. Among the listing of cautionary gears you should clear, one the most key are the safety shoes, which, as the address intimates, gifts your toes protections and safety.

Chance events do befall in workplaces and these are realities. Safety boots may not be low-budget, but in the long run, and wounded feet is much more costly to heal than purchasing a pair of shoes that are formed for durability and protection. Safety shoes fare in diverse patterns and functionality although it s distinguished role is to furnish guard for your feet. Their outsoles are named from various gracious of compounds that can present you cozier traction and grasp of the ground or pavement you are operating in. Most of these boots are established with metal plating inmost set adjacent the tip of the shoes that yields it a solid and more functional frame for incremental protective covering. When you are in a building locate and you released your hammer, even it passes instantly on your foot, your toes are secure from the main affect a dropping hammer could make. Although conforming boots are constructed with steel metal plating inmost, snappy technology has admitted manufacturing businesses to produce reinforcers that are caused from dissimilar intricate materials that establishes it more lightweight but functional as well. Industrial safety and health law take the employment of such boots in some industrial scenes and rigorously needs certification of safety boots and invest the symbolizations outside where it is easy reckoned.

Safety boots are the most durable and hard footwear you can perchance bear. They are established with metal plates innermost that can protect your toes from dropping heavy objects or from stepping at any sharp objects that can easy get through any general shoes. This as well volunteers surplus protection to workers functional in wet environs because these are exceedingly waterproof. This can forbid water and other dangerous liquid content from sipping in inwardly your shoes that can potentially harm your feet.

Most safety boots make out with a symbolisation that shows the protection the shoe volunteers. A green triangle is class 1 toe cap with puncture endurable sole and the yellow triangle is class two with the aforesaid sole possess. A white square with an ohm symbol inside is unsurpassable for electrical aegis; Yellow Square with SD is for anti static safety and the red square with C symbol is an electrically conductive shoe. If your engaged surroundings is the forest which necessitates you to practice chainsaws and other equipment alike to it, calculate for shoes with a fir tree symbolisation as it suggests aegis from chainsaws and other bladed stuffs.

Safety footwear is inescapable in protecting you from the adventures of your employed surroundings. Fortuities always come about and the most prodigious matter is that you are properly well-kept from these from head to foot.



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28 Aug

Industrial Safety and Health Engineers

Posted in safety on 28.08.10 by Merlyn

CollegeGradCareers asked:


CollegeGrad.com – Career Videos, Industrial Safety and Health Engineers. Many jobs carry an element of risk. Through the years however, the United States has tried to make even the most dangerous places to work as safe as possible.

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28 Aug

Industrial Safety 101 (Part 2) – WESCO “Never Assume” Electrical Safety Series

Posted in safety on 28.08.10 by Merlyn

WESCODistribution asked:


Produced by WESCO and ESFi, the Industrial Safety 101 video provides safety awareness for individuals qualified to repair or maintain electrical equipment and installations.

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28 Aug

Industrial Safety

Posted in safety on 28.08.10 by Merlyn

Jim Staller asked:




Industrial safety is important for all employees on a daily basis and working in an area without safety awareness may result in serious bodily harm or possibly even death. Industrial safety is a key factor in running a company and there are many aspects to consider when providing overall safety for your employees. You must ensure that employees have special equipment and procedures to ensure eye safety, ear safety, head protection, fire prevention and respiratory protection. Here are ways to ensure you (or your employees) are protected in each of these areas.

Eye Safety – Any injury to the eye can be very serious and possibly cause permanent eye damage to the victim. It is important to make sure your eyes are covered at all times by wearing goggles or other forms of eyewear. Make sure the goggles you are wearing provide protection around the sides of your eyes as well, otherwise flying debris may come in through the side and puncture your eye.

Ear Safety – Ear safety is important because without it, our ear drums would be severely damaged from the loud noises constantly occurring in the workplace. Ear plugs and ear muffs are the most common forms of ear protection, however there are other alternatives as well, such as disposable hearing bands. By wearing these pieces of equipment, you are not only protecting yourself from loud noises, but also from flying debris which may enter the ear and possibly cause infection.

Head Protection – Protecting your head is easy and can end up saving you a lot of pain if an unwanted situation does occur. Wearing protective head gear can be as simple as putting on a helmet or hard hat before entering a location where there may be falling objects. Head injuries may result in brain damage, but you can significantly decrease the chance of serious injury by wearing head protection.

Fire Prevention – Working in an industrial area means that there is always a possibility that a fire may occur. If a situation like this arises, you will want to be prepared and the best way to do so is by having a fire extinguisher on hand at all tomes. Fire extinguishers are the best way to eliminate or control fires until the fire department arrives.

Respiratory Protection – Working in an area in which the air is constantly filled with pollutants can be dangerous and may ultimately result in serious respiratory problems for individuals working in these areas. A simple way to protect yourself from poor air quality is to wear a respiratory mask when working in these areas. Wearing a face mask can greatly decrease your chances of suffering from respiratory problems in the future.

Other Safety Wear – Other forms of safety wear which are critical in industrial areas include work boots and gloves. These are important in areas which you will have hands-on contact with dangerous equipment or areas where you may possibly drop the equipment onto your feet.

It is important to research and follow all safety rules when working in an industrial area. Everything can change in a split second and you want to ensure you are as prepared as possible for any situation which may arise.

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27 Aug

Industrial Safety and Health Engineers

Posted in safety on 27.08.10 by Merlyn

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industrial safety

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