OSHA Subpart U

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OSHA Subpart U

• Blasting and the Use of Explosives

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Blasting

• Blasters cannot be substance abusers (not under
  the influence of intoxicating liquors,
  narcotics, or other dangerous drugs)
• 1926.900 (c)

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Blasting

• Account for all explosives at all times (locked
  magazine keep an inventory)
• 1926.900 (d)

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Blasting
Stemming
Burden
Face
Toe
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Delay Blasting
Firing of first delay
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Delay Blasting
Firing of second delay
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Delay Blasting
Firing of third delay
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Above Ground Blasting

• Conducted between sunup and sundown.
• 1926.900 (j)

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Blasting

• Use mats or other means of blast containment when
  blasting near buildings, congested areas, or near
  railways, highways, etc.
• 1926.900 (h)

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Blasting near overhead power lines

• Do not proceed until operators and/or owners have
  been notified and only after safe measures of
  control are taken
• 1926.900 (o)

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Do no operate equipment within 50 feet of loaded
holes and do not drill holes within 50 feet of
holes with missfires
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Loading Blast Holes

• Load only those holes to be detonated in the next
  blast
• No drilling once the explosives are in nearby
  holes
• Dont leave explosives unattended near the blast
  site
• 1926.900 (d) (g)

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Prevent accidental discharge of electric blasting
caps (radar, radio transmission, adjacent
powerlines, lightning, etc. 1926.900 (k)(1), (2),
(3)
Detonators short circuited in holes until wired
into the blasting circuit Suspension of blasting
operations during or before electric
storms. Signs to turn off radio transmitters
within 1000 feet.
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Detonators (blasting caps, electric blasting
caps, detonating primers, and primed cartridges)

• Not stored in the same magazine with other
  explosives.
• No smoking within 50 feet of detonators or
  explosives
• 1926.904 (b) (c)

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Blasting

• Proper precautions must be taken when removing
  rock near overhead power lines

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In a single blast

• All electric blasting caps shall be of the same
  type or function and of the same manufacture.
• Ensure that there is adequate power to ignite the
  detonator(s)
• 1926.906 (c) e)

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Blasting

• Blasts shall be ignited with an electric blasting
  machine or properly designed electric power
  source.
• 1926.900 (r)

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Blasting

• Buildings for mixing explosives shall be
  noncombustible or sheet metal on wood studs.
• Building floors are to be concrete or other
  nonabsorbent materials
• Fuel oil storage to be separate

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Loading Blast Holes

• Tamp explosives only with wood rods or plastic
  tamping poles
• Tamp lightly
• Never tamp the primer
• 1926.905 (c)

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Loading Blast Holes

• All blast holes in open work to be stemmed to
  confine the charge.
• 1926.905 (o)

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Blasting

• No drilling once the explosives are in nearby
  holes
• Dont leave explosives unattended near the blast
  site

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Firing the Blast

• Before blasting, issue a loud warning
• Be certain all surplus explosives are in a safe
  place
• 1926.909 (b)

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After the blast

• Wait (at least 15 minutes in tunnels) to let the
  air clear before entering the blast area to make
  an inspection
• 1926.910 (b)

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Check after the blast for misfires

• No drilling within 50 feet of a hole with a
  misfire
• 1926.905 (k)

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Dealing with misfires

• Use a new primer and try to reblast
• or
• Wash out the explosive and primer
• 1926.911 (c)

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Blasting

• Serial and Parallel Blasting

Free Face
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