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MSHA

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MSHA S Guide to Equipment Guarding Advantages of Using Expanded Metal or Sizing Screen The components guarded can be inspected without removing the guard. – PowerPoint PPT presentation

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Title: MSHA


1
MSHAS Guide to Equipment Guarding
2
Advantages of Using Expanded Metal or Sizing
Screen
  • The components guarded can be inspected without
    removing the guard.
  • Grease fittings and oil cups can be placed
    through the openings without cutting large holes
    in the guard.

3
Advantages of Using Expanded Metal or Sizing
Screen
  • At most operations this material is readily
    available.
  • In certain circumstances, the use of expanded
    metal guards serves to allow smaller particles of
    spilled material to pass through the guard with
    minimal buildups.

4
Equipment Guarding
  • This presentation contains examples of commonly
    used equipment guards.
  • Alternative designs are acceptable provided the
    requirements of the guarding standards are met.
  • MSHA recognizes that there may be site specific
    complex situations which require unique guard
    design and installation.

5
MSHA Requirements
  • Moving machine parts must be guarded to protect
    persons from contacting gears, sprockets, chains,
    drive, head, tail and takeup pulleys, flywheels,
    couplings, shafts, fan blades, saw blades, and
    similar moving parts that can cause injury.

6
MSHA Requirements
  • Overhead drive belts must be guarded where the
    whipping action of a broken belt could be
    hazardous to persons.

7
MSHA Requirements
  • Unguarded conveyors next to travelways must be
    equipped with emergency stop devices to readily
    deactivate the drive motor.

8
Designing Guards
  • Consider all possible contingencies , including
    acts of thoughtlessness and foolhardiness.
  • The opinions of the operator of the machine, the
    supervisors, and maintenance personnel could
    enhance design and construction.
  • Guards cannot be removed unless the hazards they
    guard against have been eliminated.

9
Effective Characteristics
  • Considered a permanent part of the machine or
    equipment.
  • Installed as close to the machine part as
    feasibly possible.
  • Prevent access to all moving machine parts.
  • Designed for the specific job and specific
    machine.

10
Effective Characteristics
  • Designed and fabricated to the extent practical
    to such dimensions and weights that one person
    is able to physically install and remove the
    individual guard components.
  • Constructed and maintained to withstand vibration
    and shock during normal operation.
  • Not present a hazard in itself.

11
Equipment Guarding
  • Materials for guards should be carefully
    selected. For most installations, guards
    constructed of metal framing with sheet metal,
    perforated metal, expanded metal, or heavy wire
    mesh are more satisfactory than those of other
    materials.

12
Methods of Guarding
  • The selection of a guarding method may depend
    upon a number of factors such as
  • space limitations,
  • production methods, and
  • frequency of use.

13
Methods of Guarding
  • Moving machine parts must be guarded rather than
    restricting access to the area by installing
    railings, chains, cable, or gates.

14
Area Guards
  • An area guard is any guard which covers more
    than one independently controlled component, or
  • is large enough to permit a person to place
    themselves between the moving machine parts and
    the guard.
  • Area guarding is not acceptable!

15
Examples of Area Guards
  • Gates, doors, or barriers constructed across
    openings into areas that contain multiple tail
    pulleys, drive belts, drive pulleys, and other
    moving machine parts.
  • Fencing constructed around areas that contain
    more than one independently controlled pulley,
    shaft, or drive belt.

16
Examples of Area Guards
  • A guard that can be entered by persons enabling
    them to get between the inner perimeter of the
    guard and the moving machine parts.
  • Historically, if space is provided between a
    guard and a hazard, someone will eventually go
    there and be exposed to the hazard.

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