Document k9Z7557Xyjzy84Rg3X6QKLMzO

3 <( 3. F. Hecht ON - XRU( 3. M. Roggenbaum j ""'General Manager DCT Industrial , 1 H*- w' rL I * COMPANY CORRESPONDENCE Mfg. Oiv<SiO* coot Chemcia1 O' v 'S >0** ------- J-dnuciry^L, Of*'CC Trenton Chemical Hygiene_______ Personnel Highland Park ____ Periodic Industrial Hygiene Survey A periodic industrial hygiene survey of the Trenton Chemical Plant was conducted by A. H. Gomez and the writer during the period of December 4 through December 6, 1967. Concentrations of air-borne dust, toluene, methyl ethyl ketone and monochlorobenzene vapors and carbon monoxide gas were determined. Exhaust ventilation sys tems were evaluated. The data pertinent to the recommendations listed below appear on the attached data sheets. Other data retained in our files and is available upon request. Summary and Recommendations 1. Air-borne Dust - Excessive concentrations of air-borne asbestos dust were measured in the breaching zone of the employees who work on the balcony in the Brake Lining Building. It was under stood from Plant Personnel that a project has been initiated which will result in the revamping of this operation. The fol lowing are recommendations irrespective of the completion of the Drooosed oroject: (a) The employees on the balcony should wear approved type respiratory protection until the project has been completed and the air-borne dust concentrations determined. (b) The transferring and weighing of reclaimed asbestos should be done under an enclosed type exhaust ventilated hood with a minimum exhaust volume of 75 cubic feet per minute (efm) per square foot of hood opening. (c) The balcony floor and mixers should be cleaned daily with an industrial type vacuum cleaner. 2. Solvent Vapor - Excessive solvent vapors were measured at the brake lining extruders, brake lining adhesive application, and at the drum-off area for the new paint mixers in the Process Building. The following recommendations are therefore made: (a) An exhaust ventilated drying hood should be installed be tween the two brake lining adhesive application operations. (b) The doors on the brake lining drying hoods must be kept in a closed position so the exhaust system will capture the solvent vapor. If enforcement is not possible, metal sheets 4* 1*0-7*7* MCV. t-l -2- The exhaust ventilation systems discussed under Recommendation 3c do not provide an effective capture velocity. In most instances the capture velocity is zero. The low capture velocities are due to changes in the method or process without corresponding changes in the ventilation system, insufficient air volumes, crimped or broken flexible duct work or poorly designed systems. Toxic mate rials such as lead and zinc chromate are poured from the balcony into the mixers on the main floor. It is imperative that the ex haust systems provide effective control at locations where the materials can become air-borne. Therefore, it is recotmnended that a capture velocity of 100 fpm be provided at the operations in question. Carbon Monoxide - The State of Michigan Division of Occupational Health has established the limit for carbon monoxide at 50 ppm. The limit was consistently exceeded in the shipping and receiving area of the Brake Lining Building. Until the gasoline powered lift trucks are replaced with battery operated trucks, the engines should be kept tuned as finely as possible. This will serve to reduce exhaust emissions. Para Sheet Asbestos Dust Concentration Location Concentrat ior. in mppcf** Maximum Allowable Concentration Balcony - Load Mixers Repeat Sample Repeat Sample Repeat Sample Dump Asbestos From Balcony To Downstairs Mixers Brake Lining Grinding - Inspection - West Table East Man Brake Lining Grinding - Inspection - East Table West Man Number 1 Saw (General Air Sample) Number 3 Saw (General Air Sample) Number 4 Saw (General Air Sample) 15* 13* 13* 10* 1 less than 1 1.7 1.2 1.1 1.4 *Means the asbestos dust concentration was in excess of the maximum allowable concentration. **Means millions of particles per cubic foot of air. Samples were collected at breathing zone level with i Mine Safety Appliances Company Midget Impinger. Para Sheet Solvent Vapors Location Concentration in Parts of Vapor Per Million Parts of Air_______ Threshold Limit Threshold Limit Threshold Limit Threshold Limit Value For Toluene Value For Monochlorobenzene Value For Methyl Ethyl Ketone Value For Xylene Transfer Brake Lining Material From Mixer To Carts Shovel Brake Lining Material From Box Into Hopper Transfer Linings From Extruder Into Drying Racks Guide Brake Linings Into Adhesive Applicator Unload Brake Lining From Adhesive Applicator Between Adhesive Rack Being Loaded And Ovens Drum-off At Paint Tanks In Process Building 200 75 (a) 200 (b) 100 (c) 1400-1600 1000-17000 150-600 75-80 (b) 40-50 (a) l00-300(b) 75-100(a) 50-500(b) 100-400(c) Solvent vapors were measured with a Johnson-Williams Aromatic Hydro carbon Indicator, Model SS-P. 1 Data Sheet Exhaust Ventilation Location Air Movement In Feet Per Minute Brake Lining Building: Balcony North Day Mixer #103019 Hycar Hopper Asbestos Hopper South Day Mixer Hycar Hopper Asbestos Hopper New System - South Wall 3 Sided Hood Enclosure Scales For Large Barrels Scales For Weighing Pails Hazardous Room Extruders - Wooden Boxes Extruders - Drying Racks Adhesive Application - West Unit - East Unit Adhesive Drying Racks Baker & Perkins - Mix Asbestos & Solvent Cutting Room Hoods Over Presses Cut Linings Into Two Pieces Cut Ends To Length Grinding Area Packing Tables Grinding Hoods 50-75 0 50-75 30-50 500-700* 100 100 0 50 100-125 75-100 0 0 0 200-300 250-350 175-300 300-800* Old Building: Mill Room - (North West Room) Mill Middle Mixer End Mixer (#3) Balcony Over Baker-Perkins #2 - Chute - Hood For Small Containers 0 0 0 0 0 Data Sheet Exhaust Ventilation (Page 2) Location Air Movement in Feet Per Minute Over Baker Perkins #3 - Chute Chute For Zinc Rich Primer Ball Mill Room - (Middle Room) Chute In Middle Of Floor Chute At Side-Zinc Chromate Chute Middle Room - North Wall Large Mixing Container Small Mixing Hood DiethylenetriamineHood 30-50 0 0 0-30 0 100 50-75 Bay D2 - Pouring and Weighing Bay C2 - I^S Coating Placed In Chute Bay B5 - Mills Adamson United Farrel Albert Bay C4 - 2 Hoods For Containers #CW25l & CW524 Bay D3 - On Platform - Sidedraft Hood 100-150 0 0 0 0 0 0 Exhaust ventilation readings are in the form of capture velocities except for the readings with an * which indicates that the reading is a face velocity. Air movement was measured with an Alnor Velometer, type 3002. Data Sheet Carbon Monoxide Concentration Location Threshold limit value Brake Lining Building: Concentration in Parts of Carbon Monoxide Per Million Parts of Air 50 General Area of Shipping And Receiving(12-4-67) Repeat Sample (12-4-67) Repeat Sample (12-5-67) Repeat Sample (12-6-67) Repeat Sample (12-6-67) 5U-75 100 100 125 75-100 Power House less than 15 Carbon monoxide was determined with a Mine Safety Appliances Company Carbon Monoxide Indicator.  HAM( D'*. L. N*U( Eschelbach OtPT w OlVISlOM !r.CR COMPANY CORRESPONDENCE coot n.*NT 0**'CI . Industrial DC*T Hveiene Personnel OlVISlO* Highland Park 9y^ANT ZL>. .R_ Lombard___________ _ _ _ _ _ _ _ i______ Safety______________________Chemiral __________T rpnrnn_________________ PERIODIC INDUSTRIAL HYGIENE SURVEY The recommendations listed in the survey report have been reviewed. The action taken or planned is given below: 1. Air-borne Dust A project 7605-68-29 for a revised mixing for brake linings has been approved. The installation of Littleford mixers, blenders, and related equipment bring under control the air borne asbestos dust problem. (a) Until the installation is completed employees on the balcony are wearing an approved type of respiratory protection, and the exhaust hoods at the day mixers will be cleaned to improve the existing ventilation and restore the system to design capacity. i i n An enclosed type exhaust ventilated hood at the location of transferring and weighing of reclaimed asbestos will be designed to meet the minimum exhaust volume of 75 cubic feet per minute per square foot of hood opening. The drawings will be referred to your office for comment and if satisfactory after approval is received for the expenditure the hood will be installed. (c) The balcony floor and mixers will be cleaned daily. An industrial type vacuum cleaner is available and can be used as soon as an air supply is installed. .2 Solvent Vapor . - rD: : c> . ____ j; V- "U -f ^ (a) An exhaust ventilated drying hood will be designed, tnenp"'' reviewed with your office and installed when approved, ' r--L*-(b) The doors on the brake lining drying hoods are kept in -r a closed position. This will require continuous policing J-- for enforcement. If we are not successful your recommen dation to install metal sheets on the sides of the racks will be followed. 4. MO* 7*7* KIV 1WM (c) A canopy hood which provides a capture velocity of 100 feet per minute has been installed at the paint drum off station. 3. Exhaust Ventilation r.-'^Ca) The brake lining adhesive drying hoods will be increased in number to provide effective capture of the solvent vapor. (b) As indicated in 1. (a) the ventilation at the mixing operations on the balcony of the Brake Lining Building will be improved by cleaning and revision to restore the system to design capacity. (c) The exhaust hoods or exhaust volume will be altered to ,, provide a capture velocity of 100 feet per minute at the locations you list as indicated below: (1.) Canopy hoods for containers CW 251 and CW 524 < a project request will be prepared for approval to obtain a new fan. The existing equipment is ,Vnot adequate and must be replaced. (2.) Canopy hoods for containers CW 301 and CW 302 these hoods will be connected into existing exhaust ventilation to provide the capture velocity required. (3.) Side draft hoods for the two Baker Perkins mixers . in the northwest mill room present a real problem - " ^ ' a new Pangborn dust collector system has been ordered v ------ - and these hoods will be connected _to it. However, --' 'work will have to~5e'~abne~ to determine if it is economically feasible and possible to engineer an exhaust hood to meet the capture velocity of 100 feet per minute. (4.) Hockraeyer mixer in the middle room; hoppers on the balcony, which empty into the Baker Perkins mixers; and ball mill room - a new Pangborn dust collector system is on order for this area. The expected com pletion of this installation is August, 1968. (5.) Hopper on the platform at Bay D4 - the Pangborn dust collector at this unit will be cleaned which should restore the capture velocity as required. -3- (6.) Zinc rich primer mixer - Che hood has been connected to the Pangbom dust collector system. A test will be made to determine capture velocity when the Velometer equipment is received. 4. Carbon Monoxide Gas Concentration The existing gasoline powered lift trucks will be maintained to reduce exhaust emissions. A new battery powered truck is on order and all future truck replacement for use inside build ings will be battery operated units. ERL/ph CC: J. A. Acker W. F. Bavinger R. F. Bowers M. F. Bruton, M.D. W. T. Diehl S. C. Enders B. F. Hecht W. L. Knapp, M.D. F. E. Repucci N. A. Trombley E. R. Lombard Safety Administrator IN.tit COMPANY CORRESPONDENCE D. L. Eschelbach )M . MM( E. R. Lombard oe** Industrial Hygiene OC*Y Safety Admin. Division coot Personnel OlVlSlON Chemical Oa tf Julv PVAMT OPPiCK Highland 22. 196s Park Trenton Renly on ^ollow-l'p of Periodic Industrial Hygiene Survey Dec. 1967 Corrective action has been taken to improve the control of dust created by the brake lining mixing operations. 1. As I explained to you by phone there will be no additional hoods installed at the location of the transferring and weighing of reclaimed asbestos. There is another scale with existing exhaust ventilation in this same area vhere the transferring and weighing of reclaimed asbestos can be done with adequate ventilation. This will be satisfactory until the new system is installed. 2. The brake lining mixing area is being cleaned daily with an industrial type vacuum cleaner. ERL/jh cc: S. C. Enders F. E. Repucci N. A. Trombley rjf / / E/. -Lombaw^^V Saife^ Administrator =\V c