Document oenJxB39q4bEkRbY2vX7J72Vo

nwrt ducts ifc normally out moved welding. Gradating fans directed and the ventilation system does not from the side hdp to dilute the fume remove the fumes. According to re* which may he concentrated in the port#, thb type of iryteo has best breathing zone of the welder. rffreiively used in shipyard* for the Another means of control is the a ropiralor. It is sufficient in mart welding for the employee to wear an ordinary helmet and to arrange the ` position of the work so as to prevent . the rooccstraled fume from Sowing control of weMhg fumes in confined me of personal rrepiratory equip under the helmet. are**, fn view of thb experience it should therefore be a satisfactory means of control for welding fumes iq tanks. However, supervision and education are necessary to make sneh system* effective. Where the room volume per welder is Urge, natural ventilation within .the plant is usually sufficient to pre vent accumulation of excessive eon* venimion of fumes from plain steel ment. Air line respirators mid fume respirator* hare been developed which will provide adequate protec* lion. Some manufacturers bare on the market welders* helmets with fa cilities for providing fresh air to the wearer. Use of this type of equip ment has been limited. Since the welder b already burdened with Sd* rart, goggles, and protective clothing he probably will not be teeeplive to Dry firladig Dust faulting from the grinding of nontoxic metals which are free of sand is generally considered a irai- usee and is not harmful per se. Despite this fact some stale laws ro> quire grinding operations to be ns. tillted. This requirement hss prob ably been a holdover from the days when sandstone wheels were preva lent and also to prevent the erotica of a nuisance condition. Grinding th wheels in use in industry have arti ficial abrasives, such as aluminum ox ide or carbide. Emery, a nat ural product composed essentially of aluminum and magnetic oxide of iron, may also he used. A permiasiUe limit of 50 million particles pa cubic LADDER SHOES DO YOU GET THESE EXCLUSIVE FEATURES foot of air for aluminum oxide and silicon carbide was recently accepted by the member! of the American Conference of Governmental Indus trial Hygienists. Such a limit is 12k BFCAyS l . . . era) and contortrations of sarh mag SAFUfI hot tfralfH rM9M f stetf cord and rubber In nt Tread nitude are normally not cneountoed. When lead, silica, or some similar toxic material comes in contact with the grinding wheel the exposure to the abrasive matter may be ignored hot* 1kmb on DRY aatoa would slip on wet swfoeex. and the exposure evaluated.on the lww of the toxic material. If thb latter material Is controlled, the nd- aaace wiD also he eCnhitel Vesxtilarioo systems for grinding wheel* hare been fairly well stand- j aidtzed and generally are satisfactory to prevail a nuisance. Hoods should ' aldose the wheel as completely as b I practicable. Air volumes should lie to cause as inward flow into : the hood when using the amsflert . wheeL This b especially tree where ! toxic materials are involved. : Wat Grinding j Baffles, hoods, and guards are geoj eraDy located near wet grinding 1 wheels to prevolt dispersion of the j liquid used as a coolant These de* { rices are usually, auffirient to control | the dust If ft is portoric ha nature, j tf the dost liberated is toxic, meI **"fr*l exhaust ventilation may be ! required. j Itisg ood PoBsMof Buffing compounds applied to tl.-ri* used for buffing and polishing vai v in composition. Waxes and vari,.c- ivpa of abrasive* are the major (vfiiponcnta. These materials, plus lint and fibers from the wheel, are tbr essential ingredient* of the airborne dost The toxicity tt dependent op-.n the type of abrasive. Generally ventilation b provided to improve housekeeping and reduce the number I t-omplainta and not because of the hazard to health. 16,500 XiCCcd ia Machining Smoke from oily parts is the pro tailing source of air contamination si machining operation*. Illness ha* in* been attributed to this type of exposure. As is the case with most fames and dusts of the ouiaanoe vari ety. little is known as to what effect such materials hare on existing physical abnormalities. Machining operations' on steel pro dure Urge chips or turnings; con sequently. dust b not a problem. Op erations involving the machining of high lead alloys bare been studied, and significant quantities of airborne lead hare not been demonstrated. Graphite which becomes airborne during the machining of cast iron b net considered physiologically signifi cant, and therefore, is classified as a autsance dost. Frequently manage ment consider* h advisable to pro vide ventilation for the machines which are prodoelire of the most dust, as graphite on the clothing and prion and attnounding machinery b co&Ndve to many complaints. Thai 6^00 toll report*____________ --w-n National Safety Council u Irv-'.;/? dustry's challenge to`provide ;' greatersafety forIts employees. ' Workiog hand in hand wl sdcoce. industry can reduce this staggering figure. New scientific techniques for cfaeckiog physical fitoess of employees now include periodic beariog tests with a pore tone audiometer. Avoid Occidents caused by faulty bearingin yourplant. Checkyour employees hearing regularly with a preasioo ADC Audiometer. COUP Imr doctor, norm or dink wOh the JsftsJ dmbomeetAtsesmtifiehearing toting --an ADC Aatfomalar. Oper ation is ooty wdfh factory- WRITS TODAY * htoimmam MA 0-100. Abrasive Cleaning Since alia h recognized as the most harmful of mineral dusts, an adequate ventilation system b nor mally provided at the time of mataL btioa of commercially bu2t sand Mast equipment. Continuous usage and lack of maintenance retch m a breakdown of adequate control. Visi ble eaeape of dust b the best evidence that this has occurred and it b ad visable to correct soch a condition without nodoc delay. Employees who are stationed In blast rooms are dependent upon per sonal t.-tpiratery equipment. Devices of this type are of the soppUed-elr variety, and It is necessary that the air provided be free of harmful con taminants. Air cotnprsaen should be Waled in an area free of eontamma- lion, otherwise the *nwtwiMtt wiD be transmitted to the hefawL- i FIRE HOSE DRYING MAM EAST WITH (SPOdfe usa tr uotr or juoucav uKEsr Mouxrva EmMHMI TMI (SfHliiSk COXSOeATION S last MBwmW Are. OoteeA A mUo* ft