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FILE NAME: Trade Publications (TR) DATE: 1939 July DOC#: TR040 DOCUMENT DESCRIPTION: Trade Journal Article - Mechanical-Filter Type of RespiratorsTrade Journal Article - Acceptance and Use of Respiratory Protection by Workmen Charter Member CEMENT MILL SECTION o Associated Business Papers C o n c r e t e , with which has been com bined Cement Age, New York, and Concrete Engineering, Cleveland, is devoted to the Proper Use of Concrete and the Manufacture of Cement. Published Moatkly by Concrete Publishing Corporation 400 West Madison Street Chicago, Illinois Telephone CENtral 8822 Volume 47 Established 1904 July. 1939 Number 7 Norman M. Stineman, Editor J. C. Witt, Consulting Editor A. C. Bambercer, Assistant Editor Louis Brookman, Jr*. Business Manager L. Moeller, Circulation Manager Harold 0 . Hayes, Promotion Manager R epresentatives New York City E Macdonald Bacon 17 West -loth--Room 909 Longacre 3-5260 Detroit Parker Si Tarbell 419 Curtis Bldg., 2842 W. Grand Bkd. Madison 1540 San Francisco: Don Harway Room 1009, 155 Montgomery St. Exbrook 6029 Los Angeles: Don Harway & Co. 318 West Ninth Street Tucker 9706 T he Cement Mill Edition o f Concrete The Cement Mill Edition of Concrete is edited exclusively for those interested in the manufacture of portland cement and related products. Us pages are devoted to discussions of plant design, management, operation, production, effi ciency, chemical research and control, quarry op eration, progress and news of the industry. The Cement Mill Edition also contains all the material published in the corresponding Regular Edition and so provides news of the uses and merchandising oi the materials whose manufacture is discussed in the Mill Edition. The Regular Section furnishes mill operating officials and mill executives valuable points of con tact with the users of the materials they produce. The subscription price is $4.00 a year in the United States and its possessions, and Mexico. One Dollar additional for postage in all other countries. Current copies. 50 cents each. Charter Member CONTENTS Handling and Conveying of Materials in High Staqe of Development ...... ..........................--....................... ...................... 19Q Do Light-Weight Aggregates Offer Possibilities as Side Line? 192 Temperatures and Changes in Composition in Rotary and Lepoi K ins ......... ............................................ ...................._................... 193 Acceptance and Use of Respiratory Protection by Workmen...... 194 Property Owners Fight Plans to Build Cement Plant in California 195 Composition of Cement as Key to Durability in Sea W ater____ 196 Cement Manufacturing ts a Big Industry...._____________ ____198 Marquette River Terminal Kept Busy______ _________________198 Editorial D iscussion______________________________.________199 Test for Autoclave Expansion Executives Must Support Safety Keep Side Lines Within the Family Whiskers as Dust Catchers Plan Big Safety Congress Program for Cement and Quarry Section __ 200 Selection of Coal Demands Attention to Many Factors ..... ..........201 Telliaq World's Fair Visitors the Truth About Machinery.... ...... 201 Thirty-Nine Cement Plant Quarries Operate Safely In 1938___ 202 Mill Equipment_____________________________________ 203 Men and M ills_________ 204 Advertisers' Index, Page 32 CONCRETE is indexed in INDUSTRIAL ARTS INDEX, which may be consulted In any Technical or Public Library. Audit Bureau o f C irculations C O N C R E T E -- Cement Mill Section -- July, 1939 Copyright, 1939, by Concrete Publishing Cocp. Page 189 Acceptance and Use of Respiratory Protection by Workmen W ORKMEN readily accept devices for personal respiratory protection when encountering atmospheres that are markedly discomforting or intolerable to breathe, or for situations that have either been observed by them to cause imme diate harm or which they definitely un derstand may cause immediate harm. There are. unfortunately, some persons remaining who for one reason or another do not believe in the use of these pro tective devices. To a considerable extent they are persons 'ho do not have a good acquaintance and understanding of this equipment, especially those whose occu pational experience antedates the present safety movement. Others accept exposure to harmful atmospheres as part of their occupation, and frequently are proud of their ability to " take it" or "eat it." as thev say. Some persons are plainh ob stinate and contrary. Undoubtedly some are fearful or have other complexes re sulting from lack of experience and knowledge of the protection afforded. During the time this discussion was being written, several firemen collapsed and were sent to a hospital in a serious condi tion from breathing gases while fighting a fire that occurred within sound and sight of the writer--all because they did not wear respiratory protection. Whether or not this was due to lack of equipment, aversion to wearing it, or to some of the complexes mentioned is not known. Difficult in Tolerable Atmosphere As may be expected, somewhat more difficulty would be experienced in secur ing the proper use of personal respira tory protection for situations in which the harmful atmosphere is tolerable or at least only mildly discomforting. This is especially true where exposure is to a .ubstance, as silica dust, that posseses 10 sense-perceptive properties other than lerhaps a visible dustiness, if conditions rc extremely bad, and produces no dis- from Report on Engineering Control, pre nted to the National Silicosis Conference by jmrcmtee on Prevention of Silicosis through igineering Control, headed by Warren A. mk, Connecticut State Department of Health, irtford. Conn. ge 194 tinct self-observable immediate or accu mulative effects on health until serious damage has been done. The experience in the use of personal respiratory protection for the situations that may produce silicosis has been di verse, and in some instances conflicting. In one extreme there are many verified reports of requests for respirators by workmen, even demands in some in stances, because these workmen under stood the hazards of their occupation and desired to protect their health. In other situations workmen have requested res pirators for protection from nuisance dusts primarily as a means of avoiding discomfort. The usual experience is for the employer to adopt respiratory pro tection as a means of preventing occupa tional disease and for the workmen to accept it. In general, there has been no difficulty in adopting this means of pro tection where there is a need and the proper equipment has been procured, and supervision given to its use. Supervision of Use Personal respiratory protective de vices must be maintained in a condition, especially from the standpoint of giving protection, that is substantially the same as when received from the manufacturer. Replacement and repair parts that are identical with those originally supplied by the manufacturer should be used, un less he advises that other parts are suit able and also permissible under the pro visions of any approval that the device may have. Proper maintenance requires a thor ough knowledge of the device and should be performed by a responsible person. Where a considerable number of respirators are used, it is good prac tice to have a " respirator room" with an attendant. The respirators are issued out to the workman in the morning and re turned at the end of each day. They are then cleaned, sterilized, any necessary re placements or repairs made, and put in a good condition for reissuance the next day. This plan is already in use and has been found to be very satisfactory. Too frequently the respirator is given direct to the workman, after which he is responsible for the wearing, mainte nance, and care until it is worn out. This procedure may be the most convenient if only a few men and respirators, say five or less, are involved, but it is not satisfactory unless a good degree of su pervision is exercised. Each person should have his own res pirator for a working day unless they are cleaned and sterilized between each in terchange between men. The interchange of respirators without cleaning and steril izing is far worse practice than the "com mon drinking cup." Respirators and all parts should be marked with individual identifying numbers. Storage of Respirators The storage of respirators should be in a clean place, free from industrial dusts. It is an old observation that the dust on the inside of the facepiece of a respirator stored in a dirty place may exceed that acquired by direct breathing from the air. A respirator is an article of personal hygiene and should always be considered as such. The use of respirators should always be supervised to insure that each is worn properly and all parts are functioning as intended. They should be inspected when not in use. to insure their proper main tenance. It would be very good practice for all supervisors of workmen who use per sonal protective equipment to occasion ally wear the protectors under the con ditions of performance of the workmen's duties, so that they may have first-hand experience for planning and supervising their use. There have been observations and re ports of situations where the workmen have been indifferent and even opposed to the use of respirators. If compelled to wear them by administrative order, they do so properly only when under very strict supervision. When the supervisor's hack is turned, the workmen render the devices ineffective by ruses and tricks, luly, 1939 -- C O N C R E T E -- Cement Mill Section Cleanir CON CEMENT M such as improper assembly, destruction of filters, and adjustment to make a loose fit around the facepiece. As these poor experiences sometimes occur in the per formance of industrial operations of the same kind that they have been conducted in other plants that have good experience with respirators, it is indicated that in these situations the difference is due to either the management, the employees, the condition of work, or the type or quality of equipment provided. It is usually lack of supervision and failure of the employer to convince the employee that protection is needed. It is rather significant that persons that procure and pay for respirators for their own per sonal protection seldom find difficulty in using them. These persons are convinced that they need protection. Cleaning and Sterilizing Respirators, especially the facepieces, should be cleaned at the end of each day in which they are used and sterilized at least once (preferably twice) each week if the same respirator is issued to the same person each day, and always before they are given to another person to wear. In cleaning a respirator all metal and rubber parts (especially any parts that come in contact with the skin) should be scrubbed both inside and out with soap and luke warm water. This pro cedure is always required for removing dust, dirt, and perspiration, regardless of the use of other sterilizing agents. To a large extent, the procedure to be used for sterilizing a respirator depends on the materials of construction and their possible damage or destruction. Recom mendations for the proper procedure for a particular device should be obtained from the manufacturer. The following have been used: 1. Immerse the respirator (except ing filter units) in a I percent solution of cresol. The respirator should be rinsed and allowed to dry. 2. Immerse the respirator (except ing filter units) in alcohol in a strength of 75 per cent or higher. 3. Subject to a moist atmosphere of antiseptic gas, such as formalde hyde, for a period of 10 minutes. 4. Immerse for a period of 10 min utes in a solution of formalin made by dissolving one part of 40 per cent for maldehyde in 9 parts of water, and rinse. 5. Immerse in boiling water for a period of 5 minutes, or subject to live steam for a period of 5 minutes. This procedure has distinct deteriorating efTects on rubber parts. Responsibility of Employer and Employee The responsibilities of employers and employees in the proper use of personal respiratory protection are of the same general nature as those for all safety and hygiene in industry. The employer should understand the occupations per formed by the workmen and the hazards involved. He should be acquainted with the design, uses, and limitations of pro tective equipment. Where protection is needed, equipment of the proper type and of good quality should be provided. Employers should carefully consider the workman's duties and make reasonable requests and regulations for the use of the equipment. The workman should be made familiar by personal instruction with the need for wearing the equipment, and his interest in protecting his health should be obtained. He should be thor- oughly instructed in the proper use of the equipment in the performance of his work, its care, and any dangers in its use. The equipment should be maintained by the employer with the aid of the em ployee in a good, clean, serviceable con dition, and its use carefully supervised. If the employer faithfully and properly responds to these responsibilities, the workman should accept the responsibil ity for wearing the device in the most effective manner that he knows and there by co-operate in protecting his health. Satisfactory use of personal respiratory protection can not be obtained without this mutual acceptance of responsibility and co-operation. Unfortunately, there are instances in which either the employer or employee fails to respond to his responsibilities, and both may lose; the employer loses the service of the employee and the cost of compensation, and the employee loses his health and at least part of his earning power. Property Owners Fight Plans to Build Cement Plant in California LOCATION of the proposed new ce ment plant, planned for construc tion near Los Altos, in Santa Clara County, California, as a means of sup plying 5,800.000 bbl. of cement for the huge Shasta Ham to be built for the U. S. Reclamation Bureau, remains in doubt. Plans for the construction of a $4,000.000 cement plant were announced by The Permanente Company, as mentioned in an article on page 186 of the June issue of the Cement Mill Edition of Concrete. This company is composed of a group of Pacific Coast companies that formed The Permanente Company as a means of com bining their resources in order to handle the huge contract. The award was made by the procurement division of the U. S. Treasury Department, acting as the Gov ernment purchasing agency in behalf of the U. S. Reclamation Bureau. The Per manente Company's bid was $1.90 plus, per bbl., or a total of $11,025.892. An other combination of companies bid $2.10 per bbl., or a total of $12,591,747. Doubt regarding the location of the proposed new plant arises from two sources. First, the scheme is bitterly op posed by'.-a large number of property owners in Los Altos and Santa Clara County, who assert that the adverse ef fect on property values and the damage to fruit crops would far outweigh anv advantages derived from the payrolls to be disbursed by the cement plant. Real estate people declared that several large subdivision developments that were planned are being held up, pending a final decision in the matter, and will fall through completely if the cement plant is built in the announced location on Per manente Creek. In contrast to the antagonistic attitude of many of the residents of Los Altos and Santa Clara County, the Chamber of Commerce of Redding, is making a con certed effort to get the cement plant lo cated near that city, in the grey rocks district near Baird, California. Meanwhile, the Santa Clara County Board of Supervisors, which had pre viously granted a permit for construction of the cement plant, has reconsidered its action and is holding a series of largely-attended public hearings at ir regular intervals, in the effort to arrive at a final decision. The Permanente Company is headed by Henry J. Kaiser, of Oakland, Cali fornia. C O N C R E T E -- Cement Mill Section -- July, 1939 Page 19S 32 CONCRETE July, 1939 MOST AMAZING 1939 BLOCK MACHINE The FOOTE HAMMERED STRIPPER Original in Design -- Outstanding in Perform ance -- Com pact -- H igh C a p a c ity -- Low First Cost -- Quality, Low-Cost Production. THE Write today for descriptive bulletin J. B. FOOTE FO U N D R Y Fredericktown, Ohio CO. PROFESSIONAL SERVICE E. L. CONW ELL & CO. established 1894 ENGINEERS - CHEMISTS - INSPECTORS Cement, Chemical and Physical Laboratories Tests of Cement, Concrete, Sand. Steel, Cement Block, Cement Brick Chemical Analyses of AH Commercial Products Complete Technical Supervision of Central Mixed Concrete Plants 2 0 2 4 ARCH STREET PHILADELPHIA, PA. Employ the services of a consulting engineer-- it is real economy. We will be glad to assist our readers seeking the services of a good consult ing engineer or testing laboratory. BASIC PRINCIPLES of Concrete Making By FRANKLIN R. McMILLAN Director o( Research, Portland Cement Aesocintlon T H E author has culled the essentials out of a mass of *- scientific data on this subject and presents them with force and directness in this book. He shows the effects of quality of material, of proportioning, mixing, working and curing on the finished concrete. The importance of variable mixes; tests for permeabil ity; how to obtain strength, durability and watertight ness ; effective ratios; importance of proper construction methods--these and many other vital topics are dis cussed fully and authoritatively. The book represents not only extensive accumulated knowledge, but also wide practical experience in the field and laboratory. It is an enlargement and revision of a series of notable articles on concrete mixing by Mr. McMillan published in 1929. Ninety-nine pages, 6 x 9 ^ , 32 illustrations and tables. Price $2.00 Postpaid 1 Advertisers' Index 1 Anchor Concrete Mchy Co............................................... Anchor Div. ot Consolidated Concrete Mchy. Corp. Besser Manufacturing Co. . . . - .............................................. Black & Decker Mtg. Co ......... - ................................................. 2 Blystone Mfg. C o ,. ...............................................................~~ Books ... ................. .........................................Inside Back C o\er Calbar Paint & Varnish Co........................................................................... Chain Belt Co.............................................. .......... ................ C. H . & E. Mtg C o . Inc ................................................................ 20 Classified Liners ....................................................................31 Colorerete Industries . ......................................... . . 20 Commercial Shearing &Stamping C o................ 23 Concrete Equipment Co ...................................... Consolidated Concrete Machinery Corp ......... . -- - - 19 ..15 Cotnvcll Co E L . ... - - - - 52 Doswell Sc Kover ....................................................................... 21 Foote Foundry C o . I B 3_ H ansen Co., L .................... ...................... - 31 Ideal Div. ot Consolidated Concrete Machiner) C orp...................15 Ja e g e - Machine Company * K irk & Blum Mtg C<j 23 I K oci"m g Co * Li\it -'Stone Co 31 ' L & V M tg. Company 31 Ixmc Mar Cement Corp 15 Mall Tool C o .................. Maronctte Cement Mitr Co . Mepham Corp.. Gec S.. . . . . Miles M tg. Co. .. ............ Multiplex Concrete Mchy. Co ................. 19 ..................... 21 3 25 N ational Chemical & M tg Co N eider Co.. Inc.. The F A Neptune M tg. C o .............. ... Kev* H olland Machine C o......................................... Kohle. Thos. W. . . . - ............ . 22 .................... 20 ....................... 20 . ... 21 Olser., Eugene F ......................................................... ........................ 24 Pennsvlvania-Dixie Cement C orp............................ ......................... 17 Portland Cement A ssn............................................... . 18 Professional S e r v i c e ................................................. ......................... 32 Richmond Burial Vault Company Ryerson, Jo s. T .. Sc Son . .. ................... 21 21 Sasgeu Derrick Co Skilsaw , Inc ............ Sm ith Co., T . L. . Specialties . . . . Stearns M tg Co . . 21 . 16 31 24 Tam m s Silica Co. 21 CONCRETE PUBLISHING COMPANY Book Department 00 West Madison Street Chicago, Illinois Union Steel Products Co.................................................................... 20 U niversal D iv of Consolidated Concrete Vielte. Corp 15 W illiam s, C K-. Co . 21 Foil can buy wifh confidence from C O N C R E T E adzertUcrs