msha rock dust foam

Urethane foam is an effective sealant when used around the perimeter of a seal. 83. High volatile coal burns much faster than low or medium volatile coal. ... 87. When fires are sealed in gassy or dusty mines, a thick coating of rock dust should be applied to the ribs, roof and floor for several hundred feet outby the seals, and if possible ...

Jul 01, 2007· This paper presents the results of a recent coal dust particle size survey to determine the range of coal particle sizes found in dust samples collected from intake airways in 50 US coal mines in MSHA's 10 bituminous Coal Mine Safety and Health Districts (see Fig. 1). (MSHA District 1 covers anthracite mines in Pennsylvania, which do not require rock dusting.)

Sep 21, 2010· The determination to create an ETS was based on MSHA's review of accident investigation reports of mine explosions in intake air courses that involved coal dust, as well as the National Institute for Occupational Safety and Health's report "Recommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways," which ...

Conversely, this requirement is not intended to allow a miner to be at the end of a rock dust hose at a job site that is out of sight of the rock dusting machine. The purpose of this requirement is to ensure that a person will be in a position to check the operation of the diesel machine and intervene if for any reason the machine should start ...

A rock dusting composition composed of rock dust, e.g., limestone or other mineral dust, water, pumping aid, and polymer, e.g., acrylamide homopolymers, acrylamide copolymers, and combinations thereof, and a method for applying the composition to the surface of a mine. The composition has a water content and a polymer content sufficient to allow the polymer to (i) disperse water molecules ...

Dec 16, 2016· A New Approach to Foam. ... Wright believes this is the only products that has been developed that meets all the MSHA regulations regarding rock dust, including the more stringent rules imposed recently. Once activated by mixing with water, the Wright Mix O …

Jul 15, 2014· MSHA is making me put a lot more rock dust in my mine. How am I supposed to meet this rock dust requirement and still comply with the new respirable dust standard on each shift? MSHA: Rock dust is required to prevent coal mine dust explosions. The respirable dust samples from underground mines do not reflect an increase in respirable dust ...

MSHA published a proposed rule (72 FR 72301) on December 20, 2007, ... Rock dust is an inorganic, non-combustible dust, such as crushed limestone, that the mine operator spreads on coal ... a foam-producing type containing at least 21/2 gallons of foam-producing liquids …

Sep 21, 2010· Joe Main, assistant labor secretary for MSHA, said: Explosions caused by coal dust are particularly violent and deadly. When the NIOSH report was released in May 2010 containing new scientific evidence that called for a higher standard, MSHA moved quickly to get this new standard in place. We also revised our guidance on rock dusting to ensure ...

MSHA's existing definition of "Rock dust" at 30 C.F.R. § 75.2 states: Pulverized limestone, dolomite, gypsum, anhydrite, shale, adobe, or other inert material, preferably light colored, 100 percent of which will pass through a sieve having 20 meshes per linear inch and 70 percent or more of which will pass through a sieve having 200 meshes per ...

Feb 07, 2017· Exposure risk evidence provided for MSHA's respirable dust rule Dust monitoring technologies Current dust control research Rock dusting recommendations and impact on dust monitoring ... • Foam and wet rock dust. NIOSH rock dusting publications Review of Rock Dusting Practices in Underground Coal [NIOSH Publication No.2017-101, IC 9530].

Jun 08, 2015· MSHA jurisdiction extends to the quarry, crusher and stockpiles, but it does not include areas functionally distinct from mining. In addition, MSHA regulates roads leading to mines unless they are public (federal, state or county). Roads privately owned are under MSHA jurisdiction if they serve the mine, even though they may also provide access ...

Dec 20, 2007· The Mine Safety and Health Administration (MSHA), is proposing to amend the current standard for the quantity and location of firefighting equipment and materials underground to ensure that they are readily available to quickly extinguish a fire. In lieu of the current requirements for rock dust...

Nov 09, 2011· The agency also recommended seeking documented assurance from the rock dust manufacturer that the rock dust being purchased is compliant with the specifications set forth in 30 C.F.R. § 75.2. MSHA inspectors will check whether operators are following these recommendations to assure compliance with 30 C.F.R. § 75.2.

Jun 21, 2011· Based upon the experience of MSHA's field staff, MSHA estimates the total costs associated with purchasing and applying rock dust to comply with the previous rock dust requirements were $0.20 per ton of coal produced for mine operators with fewer than 20 employees and $0.23 per ton of coal produced for mine operators with 20 or more employees.

Sep 21, 2010· Even if there is an explosion, the rock dust mixes with coal dust and helps prevent it from fueling a larger blast.Under the 1969 federal Coal …

Request for Information May 1, 2014, MSHA published the final rule, "Lowering Miners' Exposure to Respirable Coal Mine Dust, Including Continuous Personal Dust Monitors" (Dust rule). In the preamble to the Dust rule, MSHA stated its intent to take the lead in conducting a retrospective study. MSHA published a Request for Information on July 9, 2018, to solicit stakeholder

MSHA - Rock Dusting Information - MSHA Rock Dusting Information. Rock Dusting. ( Definition of Rock dust) Pulverized limestone, dolomite, gypsum, anhydrite, shale, adobe, or other inert material, preferably light colored, 100 percent of which will pass …

The acid reacted with the rock dust producing foam and releasing . ... MSHA collected 444 grab samples of rock dust from mines located in Districts 2 through 11 and made these samples available to ...

of the rock dust ability to inert a coa explosion. NIOl dust SH recently conducted a ... (MSHA, 2008). 3. COAL DUST PARTICLE SIZE . As a result of the 1920s research, "mine size" coal dust was defined as coal dust that ... The acid reacted with the rock dust producing foam and releasing carbon dioxide. More acid was added until the foaming ...

Aug 16, 2017· As the foam mixes with the blasthole dust, positive pressure forces it out of the blasthole as a thick slurry. This slurry dries completely in a matter of hours. The foam is applied to the crusher operation through 1/32-inch-by-2-inch, flat nozzles. The foam is applied to the ore via three nozzles as the ore passes through the feeder.

75.403 Maintenance of Incombustible Content of Rock Dust Section updated July 2015 Release V-51 Provided the percentages of incombustible content specified in this Section are maintained, rock dust may be applied wet (including foam rock dust).

• Adheres better to the surfaces than standard rock dust • Allows for much higher volumes to be applied where needed • Held in place by the foam structure • Rock dust readily lifts into the air as intended • Ensures operators comply with MSHA's new rock dusting requirements BeneFits • Airborne rock dust reduced significantly

Aug 27, 2021· 1. Introduction. The impetus for developing a dispersible rock dust slurry came from the two requirements placed on underground coal mines. The first requirement, from 30 CFR § 75.2 (Mandatory Safety Standards–Underground Coal Mines) and 30 CFR § 75.403 (Maintenance of incombustible content of rock dust), is the application of dispersible rock dust in sufficient quantities.

Answer: NIOSH would have to defer to MSHA and 30 CFR 75.2 on this. However, NIOSH has the following publications for guidance in which dispersibility of rock dust has been explored: Brown, Connor B; Perera, Eranda; Harris, Marcia L; Chasko, Linda L; Addis, James D [2020]. Laboratory development and pilot-scale deployment of a two-part foamed ...

Sep 28, 2021· NIOSH-MSHA Respirable Mine Dust Partnership Charter. Retrospective Study of Respirable Coal Mine Dust Rule. SAMPLE Templates and Checklists. Stakeholder Meetings. Testing, Evaluation, and Approval of Electric Motor-Driven Mine Equipment and Accessories (Part 18) …

The size of the coal dust is relevant to the amount of rock dust required to inert the coal dust, with more rock dust needed to inert ner sizes of coal dust. Dust samples were collected by MSHA inspectors from several mines in each of MSHA s 10 bituminous Coal Mine Safety and Health Districts.

foam-generating machine or (b) a portable high-pressure rock-dusting machine fitted with at least 250 feet of hose and supplied with at least 60 sacks of rock dust. * * * * (b) Belt conveyors. In all coal mines, waterlines shall be installed parallel to the entire length of belt conveyors and shall be

A rock dusting composition composed of rock dust, e.g., limestone or other mineral dust, water, pumping aid, and polymer, e.g., acrylamide homopolymers, acrylamide copolymers, and combinations thereof, and a method for applying the composition to the surface of a mine. The composition has a water content and a polymer content sufficient to allow the polymer to (i) disperse water molecules ...

This is from a demonstration at a coal mine I taped. MSHA filled the tank at 5% methane with a teaspoon of coal dust to show how explosive it is. Trying to...