Document 3J39onK4RNn1z2avmRLrkorj6

FILE NAME Brakes BRK DATE 1934 DOC BRK001 DOCUMENT DESCRIPTION CT Dept of Health - Bureau of Occupational Diseases Barry Castleman's Brake Mechanic File ROM Document# / DATE 1934 1934 Type of Document published report from journal published report from conference unpublished report newspaper article letter or memorandum government report government information booklet other integr, State of Connecticut treme PUBLIC DOCUMENT NO 25 Rr dee 11% ye NINTH REPORT 57th Year aaah EG OF THE STATE DEPARTMENT OF HEALTH For the Year Ended June 30 1934 STANLEY H. OSBORN M.D. C.P.H. Commissioner de Sol thoain nd HARTFORD CONNECTICUT 1934 . fiat 0 bse EVfee CONTENTS Public Health Council Commissioner of Health Division of Medical Registration .. Division of Supplies Bureau of Vital Statistics ..... Bureau Bureau Child Hygiene ..... Laboratories Bureau Sanitary Engineering . Bureau Mental Hygiene Bureau of Venereal Diseases Bureau Public Health Nursing Bureau Public Health Instruction Bureau Preventable Diseases . Bureau of Occupational Diseases Connecticut Health Officers M^ VANS Subject AV KEQE KEQE KEQE MINK^ BUREAU OF OCCUPATIONAL DISEASES To Stanley H. Osborn M.D. C.P.H. State Commissioner of Health Hartford Connecticut : SIR have the honor to submit the report of the Bureau of Occupational Diseases for the fiscal year ending June 30 1934 PERSONNEL The personnel has not changed during the past year Albert S. Gray M.D. Director Warren A. Cook A.B. Chief Industrial Hygienist Allan L. Coleman B.S. Assistant Industrial Hygienist Hilda Baltzer Secretary INTRODUCTION With the constant accumulation of evidence on the injurious effects of unhealthful working environment and the steadily increasing costs of compensation for occupational disease it is realized that the only answer to the occupational disease problem is prevention Connecticut itself with so large a portion of its population engaged in manufacturing and mechanical industries had the foresight to recognize this fact and for the past several years the bureau has been conducting studies and surveys of working environment for the purpose of preventing occupational diseases It is interesting to note that recent reports from various sources have shown that this appreciation of the importance of prevention is being recognized not only by health authorities but by many varied groups concerned with this problem and there is a growing tendency toward enlarging the scope of activities associated with this subject So important and definitely recognized is this effect of industrial envi- ronment on health that health authorities have accepted the responsibility for occupational disease control as a public health problem of the first magnitude Haven Emerson in his presidential address at the Annual Meeting of the American Public Health Association said: Let us incorporate within the permanent functions of health departments protection of employed persons against health handicaps inherent in the place and nature of their work At that meeting a resolution was passed by the membership of the American Public Health Association as follows WHEREAS it is the responsibility of the health authorities to protect the population from all preventable diseases and WHEREAS unhealthful occupational environment constitutes an important and wide spread cause of increased morbidity and mortality among the large group of wage earners and among the general population and WHEREAS control of health hazards in occupational environment is vital to the prevention of occupational diseases therefore BE IT RESOLVED That it is a function of the department of health to include as an integral part of a complete public health program the protection of the That .cl -15 cre i sate of ath ae0d Ch, all 411- SUV ised Chty ality - of ten that than some aths BUREAU OF OCCUPATIONAL DISEASES 507 of workers in other industries were due to these causes The results of these recent studies provide additional information that excessive dust exposures have a marked effect on morbidity and mortality rates and that every effort should be made to control this condition Although the cost of injury to health by dust in terms of compensation payments is staggering this compensation cost is by no means acknowledged the greatest cost to be ascribed to dusty conditions Annual losses from claims made in Massachusetts for disability from dust inhalation averaged about 117,000 for 1929 1930 and 1931. On September 10 1931 the Wisconsin Compensation Commission had 600,000 of silicosis claims outstanding In 1932 in that state about 207,000 was actually paid for occupational disease cases In New York state a reputable authority reports a total of 1,000 to 1,500 suits for a total of 50,000,000 Claims which have originated in the last few years in various areas of this country aggregate a total of at least 300,000,000 for silicosis alone These figures are presented here to call attention to the fact that the dust hazard is one that should not be forgotten or postponed until a more prosperous industrial era develops It is in the first interest of economy that effective steps be taken at the present time for the control of the dust hazard One of the important factors from a public health point of view in connection with pneumoconiosis is that once well established the condition is progressive Accordingly the only preventive method is the control of dust producing operations so that exposure to dust will be less than that necessary to cause this disease In conducting the dust control work 41 surveys of 19 dust producing operations and 10 technical studies were made of 6 types of dust hazards The work in furthering dust control should be greatly expanded All manufacturers operating dusty processes should be fully informed of the existing hazard and of the methods of control Surveys of dusty operations should be supported by technical studies which have been found so effective in the experience of the bureau for instigating action on the part of the manufacturer for control of the occupational disease condition ASBESTOS DUST HAZARDS Asbestos is handled in appreciable quantities in eight plants operated by six concerns in this state At four of these plants asbestos is received in the raw state at the remaining plants the asbestos is received as yarn The principal products manufactured are woven and molded brake linings and clutch facing and insulated wire for which asbestos is used as the insulation In the manufacture of asbestos products the raw asbestos must first undergo certain preliminary operations These present the greatest problem in dust prevention minations have shown that even the preliminary preliminary operations However dust deter- operations can be con- ducted without exposing workers to excessive dust concentrations Evidence of the extreme dustiness in these operations is afforded by dust counts showing concentrations as high as 82 million particles per cubic foot of air in the asbestos preparation room and 76 million particles per an 508 STATE DEPARTMENT OF HEALTH ern:: cubic foot of air in the carding room as against concentrations of only pr about half million particles per cubic foot of air in these two rooms em in other plants where dust control measures have been successfully oe employed fe The necessity of providing dust control not only during normal operation but also during certain intermittent operations which may cause the ere! liberation of excessive amount of dust into the air is well shown by the N results of two dust samples collected in a preparation room of an asbestos products manufacturing plant When the raw asbestos is fed into the opener too rapidly the opener may become clogged at the outlet duct a connected to the rear of the machine A sample of air was being collected to show the dust exposure of the operator of the opener During the collection of this sample the gate at the rear of the opener was removed to clean out the clogged duct The opener was continued in operation during this time It was found that the exposure of the operator during the collection of this sample was 16.7 million particles per cubic foot of air The fact that the greater part of this dust resulted from the cleaning out operation was shown by a subsequent sample collected in this same room During the collection of the second sample the duct at the rear of the opener remained closed Not only was the opener itself being operated at this time but also a screen which must have contributed some dust into the general room atmosphere on its own account Even while both of these units were in operation the exposure of the operator was found to be only 4.26 million particles per cubic foot of air Although it is planned to reduce the dust content of this room even below this figure this pair of determinations showed the advisability of impressing upon the operator the necessity of avoiding liberation of dust by removing the gate during operation of the opener Where scrap asbestos is to be used in molded products it is necessary to send this scrap through a pulverizer It was noted that dust escapes both at the pulverizer itself and also at the bag into which the pulverized asbestos is discharged Here again unnecessary clouds of dust were given off in connection with an operation which was conducted intermittently When the bag of pulverized asbestos became full it was removed while asbestos continued to be discharged from the machine The dust con- centration at the breathing point of the operator as he conducted the entire cycle of operations in connection with the pulverizer including removal of the bag of pulverized material was found to be 10.3 million particles per cubic foot of air As a result of these dust samples these conditions are to be taken care of and a further group of samples collected to show whether the control method has been effective aye. ms of only two rooms successfully mal opera-- cause the own by the an asbestos ed into the Outlet duct ng collected During the was removed operation - Fator during thic foot of the cleaning this same at the rear itself being buted some Even while perator was Although it this figure ng upon the ng the gate as necessary Just escapes he pulverized st were given termittently moved while ne dust conw the entire ng removal on particles e conditions acted to show BUREAU OF OCCUPATIONAL DISEASES 509 TABLE NO I. ASBESTOS DUST CONCENTRATIONS DURING PRELIMINARY OPERATIONS Dust Cencentration in Million Particles Operation per Cubic Foot of Air Plant No. 1 Preparation Room Dust condition well controlled . eee seer eeee Plant No. 2 Preparation Room 82 Dust condition uncontrolled . 00s eee eee rerees eee eeeee Plant No. 3 Exposure of operator of opener Duct in rear open for 17 cleaning during collection of sample .......20 Plant No. 3 While screen in this same room was operating but duct in 4 rear of opener was not ope eee eer ren ert e ees Dust conditions at carding machines both feeders and finishers tend to be severe excepting where particularly well designed exhaust ventilation is applied Such ventilation must be close to the machine and so regulated that it does not pull the asbestos away from the machine That this can be done successfully is shown by dust counts as low as half million par- ticles cubic foot of air in carding rooms On the other hand where no per ventilation or where poorly designed exhaust ventilation is used dust counts as high as 76 million particles per cubic foot of air have been found The operations of spinning twisting and weaving can be conducted without presenting excessive dust hazards as is shown by dust counts down to a third of a million particles per cubic foot of air in connection with each of these operations However it should be definitely deter- mined by dust counts that such operations are being conducted without exposing the operator to a dust hazard in view of the fact that concentra- tions to 10 7 and 19 million particles respectively have been found In up the manufacture of molded products the raw opened asbestos or the asbestos is first added to beaters of the type used in pulverized scrap paper manufacturing When the beaters are loaded by emptying the amount of dust is bags of material directly into them an appreciable A minute air sample was collected at the breathing level produced of two men conducting this operation During two minutes of this sam- pling period bags of raw asbestos were being loaded into the beater The rest of the load consisted of scrap asbestos which was being added during the greater part of the sampling period Although higher dust concentrations were obviously being produced in loading the raw asbestos a sample was collected throughout the loading of both these materials in order to be representative of this operation as it is usually conducted The concentration of dust was found to be 13.6 million particles per cubic foot of air It has been shown that this operation can be done without liberation of excessive amounts of dust Until some method could be devised which does not involve escape of excessive amounts of dust at the plant where this high dust count was obtained the expedient of pro- viding the workers with respirators was suggested A sample of air was collected to show the exposure of workers cutting 510 STATE DEPARTMENT OF HEALTH out and inspecting clutch disks The average exposure was found to be 4.4 million particles per cubic foot of air No exhaust ventilation was provided in connection with this operation One of the major operations in the manufacture of molded asbestos products is grinding Where exhaust ventilation is well designed the dust concentration in the vicinity of grinding operations can be kept remarkably low A group of six samples was taken at one plant in connection with various grinding machines With a single exception the ventilation was found to be adequate as shown by the results given in Table No. II Samples collected to show the exposures of operators of a Blanchard grinding machine a Cincinnati grinding machine and an internal boring machine were found to be 0.6 million 0.8 million and 2.0 million particles per cubic foot of air respectively Samples No. , 2 and 3 Table No. II It was noted that a small visible dust cloud was produced when the clutch disks were stacked prior to placing in the grinding machine The concentration of dust from this source is however apparently insignificant in view of the very low dust counts obtained in samples No. 1 and No. 2. The ventilation system at each of these machines was shown to be effective in the removal of dust in these operations The fallacy of depending upon a visible cloud of dust as a criterion of the dust concentration is well evidenced by a pair of samples collected at an internal and at an external brake grinder At one of the grinding wheels a visible cloud was produced which was not entirely removed by the exhaust system but escaped into the general room air in such a manner that the operator appeared to be exposed to an excessive dust hazard To be sure the material was pressed against the grinding wheel hard enough to produce partial carbonization of the material but just how much of this cloud was smoke and how much of it was dust certainly could not be ascertained by mere inspection From an observation of the condition it appeared essential to make this exhaust hood very much more effective At another grinding wheel similar operations were being conducted but the temperature did not become sufficiently elevated to produce carbonization The exhaust hood appeared to be fairly effective in the removal of the dust produced Samples of air were taken to show the exposure of the operators of each of these grinding wheels The first grinder was found to be exposed to a concentration of four million particles per cubic foot of air This dust earns count showed that the visible cloud was made up chiefly of smoke and only aR" RA to a lesser extent of asbestos dust particles The second grinder on the other hand was found to be exposed to 17 million particles per cubic foot of air The operation which required first attention was obviously the latter but this situation became obvious only when dust counts were avail- Oe able Incidentally this machine was a particularly difficult one to ventilate An improved type of enclosure has been devised and it is planned to determine whether this is sufficiently effective to eliminate the dust hazards from this operation as has been accomplished with the other grinding operations at this plant In the operation of a lathe type grinder the operator was found to be exposed to only 1.7 million particles of dust per cubic foot of air here again the ventilation being shown to be effective . xi to be iat was bestos the dust markably on with tion was J II Manchard uo boring particles No. II Be clutch 2 concen- in view 2. The Rctive Rctive in rion rionof Rected at grinding moved by 1 manner ard To enough h of this be ascer- lation it ,, ffective acted but carboniremoval ators of exposed his dust and only +r, on the abic foot Musly the e availventilate to deter- hazards grinding and to be air here BUREAU OF OCCUPATIONAL DISEASES 511 TABLE NO II DUST EXPOSURES OF OPERATORS OF GRINDING MACHINES Number of Million Sample No. Machine being operated particles per cubic foot of air 1 Blanchard Machine ..... ce. ce e. e ee. e ec nerc seec eee eees ece 2 Cincinnati Machine ....c. ece. cece. ccc. eee. e te. nnec r ec ee 3 Internal Boring Machine eee e cree eee een eee ..........---.. 4 Internal Brake Grinder cece cece ete .........e . tee c eec eee 5 External Brake Grined ee ce cre t eect er eeeere 6 Lathe Type Grin cece e ced ce e ee re ecentr e ees 0.6 0.8 2.0 4 17 1.7 In braiding and winding asbestos yarn on wire for insulation purposes it appears that the dust hazards are not as great as those which we have been studying Dust counts should be made however to determine just what dust concentrations exist in connection with these operations SILICOSIS HAZARDS Granite Quarrying and Rough Stone Production Granite quarrying and production of rough stone by plug drilling and splitting operations are looked upon generally as operations in which no appreciable dust hazard exists where these operations are conducted out of doors and not in enclosed sheds A dust study was conducted in a surface granite quarry where rough stone was produced in this manner The management thoroughly believed that no hazard existed but wished to have this assumption verified by a dust study Samples of air were collected to show the concentration of dust to which the men were exposed during drilling operations during operations other than drilling and also to show their average dust exposure throughout the entire cycle of operations Samples No. 1 and No. 2 Table No. III were collected show how much dust was produced by the plug drilling operations Sample No. 1 represented the exposure of the worker operating a plug drill This sample was collected over a minute period and showed a concentration of 640 million particles of dust per cubic foot of air Sample No. 2 collected simultaneously with Sample No. 1 was located in the dust cloud at a point six feet away from the operation The concentration of 206 million particles per cubic foot of air found at this point represents the exposure to which any worker in the vicinity of the plug drilling operations might be subjected Sample No. 3 was collected to determine the exposure of a worker while engaged in operations other than drilling A plug drill was being operated at a distance of three feet from this worker during two and half minutes of the minute sampling period Although this worker was at no time standing in the dust cloud arising from this operation his exposure was found to be 16.8 million particles per cubic foot of air The result of this sample showed that even though the operations are conducted out doors much fine dust does remain suspended in the working area Samples No. 4 and 5 were taken to determine the exposure of each of two workers while engaged in the entire cycle of operations During the