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MSHAS Guide to

Equipment Guarding

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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 placedthrough the openings without cutting largeholes in the guard.

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Advantages of Using Expanded

Metal or Sizing Screen At most operations this material is readily

available.

In certain circumstances, the use ofexpanded metal guards serves to allowsmaller particles of spilled material to pass

through the guard with minimal buildups.

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Equipment Guarding

This presentation contains examples ofcommonly used equipment guards.

Alternative designs are acceptable providedthe requirements of the guarding standardsare met.

MSHA recognizes that there may be sitespecific complex situations which requireunique guard design and installation.

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MSHA Requirements

Moving machine parts must be guarded toprotect persons from contacting gears,

sprockets, chains, drive, head, tail and takeuppulleys, flywheels, couplings, shafts, fanblades, saw blades, and similar moving partsthat can cause injury.

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MSHA Requirements

Overhead drive belts must be guarded wherethe whipping action of a broken belt could be

hazardous to persons.

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MSHA Requirements

Unguarded conveyors next to travelwaysmust be equipped with emergency stop

devices to readily deactivate the drive motor.

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Designing Guards

Consider all possible contingencies ,including acts of thoughtlessness and

foolhardiness. The opinions of the operator of the machine,

the supervisors, and maintenance personnelcould enhance design and construction.

Guards cannot be removed unless thehazards they guard against have beeneliminated.

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Effective Characteristics

Considered a permanent part of the machineor equipment.

Installed as close to the machine part asfeasibly possible.

Prevent access to all moving machine parts.

Designed for the specific job and specificmachine.

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Effective Characteristics

Designed and fabricated to the extentpractical to such dimensions and weights

that one person is able to physically installand remove the individual guardcomponents.

Constructed and maintained to withstand

vibration and shock during normaloperation.

Not present a hazard in itself.

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Equipment Guarding

Materials for guards should be carefullyselected. For most installations, guards

constructed of metal framing with sheetmetal, perforated metal, expanded metal, orheavy wire mesh are more satisfactory thanthose of other materials.

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Methods of Guarding

The selection of a guarding method maydepend upon a number of factors such as:

space limitations, production methods, and

frequency of use.

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Methods of Guarding

Moving machine parts must be guardedrather than restricting access to the area by

installing railings, chains, cable, or gates.

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Area Guards

An area guard is any guard which coversmore than one independently controlled

component, or

is large enough to permit a person to placethemselves between the moving machine

parts and the guard.

Area guarding is not acceptable!

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Examples of Area Guards

Gates, doors, or barriers constructed acrossopenings into areas that contain multiple tail

pulleys, drive belts, drive pulleys, and othermoving machine parts.

Fencing constructed around areas thatcontain more than one independently

controlled pulley, shaft, or drive belt.

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Examples of Area Guards

A guard that can be entered by personsenabling them to get between the inner

perimeter of the guard and the movingmachine parts.

Historically, if space is provided between aguard and a hazard, someone will eventually

go there and be exposed to the hazard.

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