Dust explosion control list of standards

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Division 2 AO 6-2017 Oregon Occupational Safety and Health Division - (1) The employer shall inform contractors performing work at the grain handling facility of known potential fire and explosion hazards related to the contractor's work and work area. The employer shall also inform contractors of the applicable safety rules of the facility. - (2) The employer shall explain the applicable provisions of the emergency action plan to contractors. - (j) Housekeeping. - (1) The employer shall develop and implement a written housekeeping program that establishes the frequency and method(s) determined best to reduce accumulations of fugitive grain dust on ledges, floors, equipment, and other exposed surfaces. - (2) In addition, the housekeeping program for grain elevators shall address fugitive grain dust accumulations at priority housekeeping areas. - (i) Priority housekeeping areas shall include at least the following: - (A) Floor areas within 35 feet (10.7 m) of inside bucket elevators; - (B) Floors of enclosed areas containing grinding equipment; - (C) Floors of enclosed areas containing grain dryers located inside the facility. - (ii) The employer shall immediately remove any fugitive grain dust accumulations whenever they exceed 1/8 inch (.32 cm) at priority housekeeping areas, pursuant to the housekeeping program, or shall demonstrate and assure, through the development and implementation of the housekeeping program, that equivalent protection is provided. - (3) The use of compressed air to blow dust from ledges, walls, and other areas shall only be permitted when all machinery that presents an ignition source in the area is shut down, and all other known potential ignition sources in the area are removed or controlled. - (4) Grain and product spills shall not be considered fugitive grain dust accumulations. However, the housekeeping program shall address the procedures for removing such spills from the work area. - (k) Grate openings. Receiving-pit feed openings…

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Division 2 AO 6-2017 Oregon Administrative Rules Oregon Occupational Safety and Health Division - (ii) Clearance. Stationary tramways and trestles shall have a vertical clearance of 22 feet over railroad rails. When constructed over carrier docks or roads, they shall have a clearance of 6 feet above the driver's foot rest on the carrier, and in no event shall this clearance be less than 12 feet from the roadway. In existing operations where it is impractical to obtain such clearance, telltales, electric signals, signs or other precautionary measures shall be installed. - (20) Blower, collecting, and exhaust systems. - (i) Design, construction, and maintenance. Blower collecting, and exhaust systems should be designed, constructed, and maintained in accordance with American National Standards Z33.1-1961 (For the Installation of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying) and Z12.2-1962 (R1969) (Code for the Prevention of Dust Explosion in Woodworking and Wood Flour Manufacturing Plants), which is incorporated by reference as specified in 1910.6. - (ii) Collecting systems. All mills containing one or more machines that create dust, shavings, chips, or slivers during a period of time equal to or greater than one-fourth of the working day, shall be equipped with a collecting system. It may be either continuous or automatic, and shall be of sufficient strength and capacity to enable it to remove such refuse from points of operation and immediate vicinities of machines and work areas. - (iii) Exhaust or conveyor systems. Each woodworking machine that creates dust, shavings, chips, or slivers shall be equipped with an exhaust or conveyor system located and adjusted to remove the maximum amount of refuse from the point of operation and immediate vicinity. - (iv) (Reserved) - (v) Dust chambers. Exhaust pipes shall not discharge into an unconfined outside pile if uncontrolled fire or explosion hazards are created. They may empty into settli…

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Division 2 AO 3-2019 Oregon Administrative Rules Oregon Occupational Safety and Health Division ## (a) Ventilation. - (A) Ensure that exhaust ventilation is sufficient to maintain the atmosphere below the lowest explosive limits for the materials being applied. Ensure that all nondeposited air-suspended powders are safely removed via exhaust ducts to the powder recovery cyclone or receptacle. - (B) Do not release powders to the outside atmosphere. - (b) Operation and maintenance. - (A) Keep all areas free of the accumulation of powder coating dusts, particularly horizontal surfaces as ledges, beams, pipes, hoods, booths, and floors. - (B) Clean surfaces in a manner to avoid scattering dust to other places or creating dust clouds. - (C) Conspicuously post 'No Smoking' signs in large letters on contrasting color background at all powder coating areas and powder storage rooms. - (c) Electrostatic fluidized beds. - (A) Use only approved electrostatic fluidized beds and associated equipment . - (B) Ensure that the maximum surface temperature of this equipment in the coating area does not exceed 150 degrees F. - (C) Use only high voltage circuits that will not produce a spark of sufficient intensity to ignite any powder-air mixtures. - (D) Use circuits designed to eliminate shock hazards upon coming in contact with a grounded object under normal operating conditions. - (E) Locate transformers, powerpacks, control apparatus, and all other electrical portions of the equipment outside of the powder coasting area, with the exception of the charging electrodes and their connections to the power supply. - (F) Adequately ground all electrically conductive objects within the charging influence of the electrodes. The powder coating equipment must carry a prominent, permanently installed warning regarding the necessity for grounding these objects. - (G) Objects being coated will be maintained in contact with the conveyor or other support in order to ensure proper grounding. Re…

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Oregon Occupational Safety and Health Division Division 2 - (1) All fabric dust filter collectors which are a part of a pneumatic dust collection system shall be equipped with a monitoring device that will indicate a pressure drop across the surface of the filter. - (2) Filter collectors installed after March 30, 1988 shall be: - (i) Located outside the facility; or - (ii) Located in an area inside the facility protected by an explosion suppression system; or - (iii) Located in an area inside the facility that is separated from other areas of the facility by construction having at least a one hour fireresistance rating, and which is adjacent to an exterior wall and vented to the outside. The vent and ductwork shall be designed to resist rupture due to deflagration. - (m) Preventive maintenance. - (1) The employer shall implement preventive maintenance procedures consisting of: - (i) Regularly scheduled inspections of at least the mechanical and safety control equipment associated with dryers, grain stream processing equipment, dust collection equipment including filter collectors, and bucket elevators; - (ii) Lubrication and other appropriate maintenance in accordance with manufacturers' recommendations, or as determined necessary by prior operating records. - (2) The employer shall promptly correct dust collection systems which are malfunctioning or which are operating below designed efficiency. Additionally, the employer shall promptly correct, or remove from service, overheated bearings and slipping or misaligned belts associated with inside bucket elevators. - (3) A certification record shall be maintained of each inspection, performed in accordance with this paragraph (m), containing the date of the inspection, the name of the person who performed the inspection and the serial number, or other identifier, of the equipment specified in paragraph (m)(1)(i) of this section that was inspected.

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- (d) where no specific standards for the chemical agent are set out in the publications referred to in paragraphs (a) and (b) and no method is available under paragraph (c), in accordance with a scientifically proven method used to collect and analyse a representative sample of the chemical agent. - (4) A paper or electronic record of each test made under subsection ( 3 ) shall be kept by the employer at the employer's place of business that is nearest to the work place where the air sample was taken, for a period of three years after the date of the test. - (5) A record referred to in subsection ( 4 ) shall include - (a) the date, time and location of the test; - (b) the hazardous substance in respect of which the test was made; - (c) the sampling and testing method used; - (d) the result obtained; and - (e) the name and occupation of the person who made the test. SOR/88-68, ss. 10, 14; SOR/94-263, s. 37(F); SOR/96-294, s. 2; SOR/98-427, s. 5; SOR/ 2002-208, s. 43(F); SOR/2016-141, s. 7; SOR/2017-132, s. 2; SOR/2018-137, s. 1; SOR/ 2019-246, s. 64. - 10.20 (1) Subject to subsection ( 2 ), the concentration of an airborne chemical agent or combination of airborne chemical agents in the work place shall be less than 50 per cent of the lower explosive limit of the chemical agent or combination of chemical agents. - (2) Where a source of ignition may ignite an airborne chemical agent or combination of airborne chemical agents in the work place, the maximum concentration of the chemical agent or of the combination of chemical agents shall be 10 per cent of the lower explosive limit of the chemical agent or combination of chemical agents. - (3) Subsection ( 2 ) does not apply in respect of concentrations of methane gas in the underground portion of a coal mine. SOR/88-68, ss. 11(E), 14(F); SOR/96-294, s. 2. - 10.21 Compressed air, gas or steam shall not be used for…

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Oregon Occupational Safety and Health Division The control of dust and the control of ignition sources are the most effective means for reducing explosion hazards. Preventive maintenance is related to ignition sources in the same manner as housekeeping is related to dust control and should be treated as a major function in a facility. Equipment such as critical bearings, belts, buckets, pulleys, and milling machinery are potential ignition sources, and periodic inspection and lubrication of such equipment through a scheduled preventive maintenance program is an effective method for keeping equipment functioning properly and safely. The use of vibration detection methods, heat sensitive tape or other heat detection methods that can be seen by the inspector or maintenance person will allow for a quick, accurate, and consistent evaluation of bearings and will help in the implementation of the program. The standard does not require a specific frequency for preventive maintenance. The employer is permitted flexibility in determining the appropriate interval for maintenance provided that the effectiveness of the maintenance program can be demonstrated. Scheduling of preventive maintenance should be based on manufacturer's recommendations for effective operation, as well as from the employer's previous experience with the equipment. However, the employer's schedule for preventive maintenance should be frequent enough to allow for both prompt identification and correction of any problems concerning the failure or malfunction of the mechanical and safety control equipment associated with bucket elevators, dryers, filter collectors and magnets. The pressure-drop monitoring device for a filter collector, and the condition of the lagging on the head pulley, are examples of items that require regularly scheduled inspections. A system of identifying the date, the equipment inspected and the maintenance performed, if any, will assist employers in continually refining their prev…

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Division 2 AO 3-2019 Oregon Administrative Rules Oregon Occupational Safety and Health Division (vi) - (A) Only approved power operated industrial trucks designated as EX shall be used in atmospheres in which combustible dust is or may be in suspension continuously, intermittently, or periodically under normal operating conditions, in quantities sufficient to produce explosive or ignitable mixtures, or where mechanical failure or abnormal operation of machinery or equipment might cause such mixtures to be produced. - (B) The EX classification usually includes the working areas of grain handling and storage plants, room containing grinders or pulverizers, cleaners, graders, scalpers, open conveyors or spouts, open bins or hoppers, mixers, or blenders, automatic or hopper scales, packing machinery, elevator heads and boots, stock distributors, dust and stock collectors (except all-metal collectors vented to the outside), and all similar dust producing machinery and equipment in grain processing plants, starch plants, sugar pulverizing plants, malting plants, hay grinding plants, and other occupancies of similar nature; coal pulverizing plants (except where the pulverizing equipment is essentially dust tight); all working areas where metal dusts and powders are produced, processed, handled, packed, or stored (except in tight containers); and other similar locations where combustible dust may, under normal operating conditions, be present in the air in quantities sufficient to produce explosive or ignitable mixtures. - (vii) Only approved power-operated industrial trucks designated as DY, EE, or EX shall be used in atmospheres in which combustible dust will not normally be in suspension in the air or will not be likely to be thrown into suspension by the normal operation of equipment or apparatus in quantities sufficient to produce explosive or ignitable mixtures but where deposits or accumulations of such dust may be ignited by arcs or sparks originating in the t…

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Oregon Occupational Safety and Health Division Division 2 - (2) All belts and lagging purchased after March 30, 1988 shall be conductive. Such belts shall have a surface electrical resistance not to exceed 300 megohms. - (3) All bucket elevators shall be equipped with a means of access to the head pulley section to allow inspection of the head pulley, lagging, belt, and discharge throat of the elevator head. The boot section shall also be provided with a means of access for clean out of the boot and for inspection of the boot, pulley, and belt. - (4) The employer shall: - (i) Mount bearings externally to the leg casing; or, - (ii) Provide vibration monitoring, temperature monitoring, or other means to monitor the condition of those bearings mounted inside or partiallyinside the leg casing. - (5) The employer shall equip bucket elevators with a motion detection device which will shutdown the bucket elevator when the belt speed is reduced by no more than 20% of the normal operating speed. - (6) The employer shall: - (i) Equip bucket elevators with a belt alignment monitoring device which will initiate an alarm to employees when the belt is not tracking properly; or, - (ii) Provide a means to keep the belt tracking properly, such as a system that provides constant alignment adjustment of belts. - (7) Paragraphs (q)(5) and (q)(6) of this section do not apply to grain elevators having a permanent storage capacity of less than one million bushels, provided that daily visual inspection is made of bucket movement and tracking of the belt. - (8) Paragraphs (q)(4), (q)(5), and (q)(6) of this section do not apply to the following: - (i) Bucket elevators which are equipped with an operational fire and explosion suppression system capable of protecting at least the head and boot section of the bucket elevator; or, - (ii) Bucket elevators which are equipped with pneumatic or other dust control systems or methods that keep the dust concentration inside the bucket elevator at lea…